JP3820075B2

JP3820075B2 - White smoke prevention structure of latent heat recovery type heat source machine

Info

Publication number: JP3820075B2
Application number: JP2000055703A
Authority: JP
Inventors: 達範原; 哲司森田; 浩市川; 易司佐野; 直輝石井
Original assignee: Takagi Industrial Co Ltd; Osaka Gas Co Ltd
Current assignee: Takagi Industrial Co Ltd; Osaka Gas Co Ltd
Priority date: 2000-03-01
Filing date: 2000-03-01
Publication date: 2006-09-13
Anticipated expiration: 2020-03-01
Also published as: JP2001241641A

Description

【０００１】
【発明の属する技術分野】
本発明は、潜熱回収型熱源機の白煙防止構造に関するものである。
【０００２】
【従来の技術】
従来、例えば特開平６−３０７６２４号公報には、風呂給湯器や給湯暖房機等の排気通路に潜熱回収用の熱交換器を設けることによって、燃焼排ガスの廃熱を奪い、潜熱まで回収することによって高効率化を図るようにした潜熱回収型の熱源機が知られている。
【０００３】
【発明が解決しようとする課題】
ところで、上記のような潜熱回収型の熱源機にあっては、排気通路から排出される燃焼排ガスの温度が低下し、そのために排気口に付近で燃焼排ガス中に含まれている水蒸気が白色化して白煙が発生する恐れがある。このような白煙が発生すると、火災と間違えるケースがあり、美観上においても好ましく、白煙を抑えることが要望されている。
【０００４】
本発明は、上記の従来例の問題点に鑑みて発明したものであって、その目的とするところは、燃焼排ガスの潜熱を回収して高効率化を図るものでありながら、燃焼排ガスの温度の低下による白煙の発生を抑えることができる潜熱回収型熱源機の白煙防止構造を提供するにあり、別の目的とするところは、白煙が発生しやすい状況下でも、簡単な構造で白煙の発生を抑えることができる潜熱回収型熱源機の白煙防止構造を提供するにある。
【０００５】
【課題を解決するための手段】
上記課題を解決するために請求項１記載の発明にあっては、燃焼室４に設置されるガスバーナー５と、ガスバーナー５に空気を供給する給気ファン３と、ガスバーナー５の熱により水を昇温させる一次熱交換器６と、燃焼室４からの燃焼排ガスを外部に排出する排気通路１０と、排気通路１０内で燃焼排ガスの潜熱を回収する熱交換器７とからなる潜熱回収型熱源機１を複数個備え、前記複数個の潜熱回収型熱源機１を構成する風呂給湯器１Ａの給湯排気通路１０及び給湯暖房機１Ｂの暖房排気通路１０ａに、一本の混合排気通路２が付設されており、混合排気通路２の上面に開口した排気筒３６が設けられており、混合排気通路２の長手方向の一端は給湯排気通路１０の略Ｕ字状の折り返し通路１７に連通していると共に、他端は暖房排気通路１０ａの略Ｕ字状の折り返し通路１７ａに連通していることを特徴としており、このように構成することで、風呂給湯器１Ａ及び給湯暖房機１Ｂにおいてそれぞれ給気ファン３よる燃焼で生じた燃焼排ガスを給湯排気通路１０及び暖房排気通路１０ａのそれぞれの略Ｕ字状の折り返し通路１７，１７ａを経て混合排気通路２内で混合させることによって、燃焼排ガスが希釈されて露点温度が低くなり、従って、燃焼排ガスの潜熱を回収して高効率化を図るものでありながら、白煙の発生を抑えることができる。
【０００６】
また請求項２記載の発明にあっては、上記複数個の潜熱回収型熱源機１のうち、いずれか１個の潜熱回収型熱源機１の単独燃焼時に、非燃焼側の他の潜熱回収型熱源機１の給気ファン３を回転させるのが好ましく、この場合、どれか１つの給気ファン３による単独燃焼の場合であっても、混合排気通路２内の風量を増やして白煙防止効果を高めることができる。
【０００７】
また請求項３記載の発明にあっては、燃焼室４に設置されるガスバーナー５と、ガスバーナー５に空気を供給する給気ファン３と、ガスバーナー５の熱により水を昇温させる一次熱交換器６と、燃焼室４からの燃焼排ガスを外部に排出する排気通路１０と、排気通路１０内で燃焼排ガスの潜熱を回収する熱交換器７とからなる潜熱回収型熱源機１を複数個備え、前記複数個の潜熱回収型熱源機１を構成する風呂給湯器１Ａの給湯排気通路１０及び給湯暖房機１Ｂの暖房排気通路１０ａに、一本の混合排気通路２が付設されており、混合排気通路２の上面に開口した排気筒３６が設けられており、混合排気通路２の長手方向の一端は給湯排気通路１０の略Ｕ字状の折り返し通路１７に連通していると共に、他端は暖房排気通路１０ａの略Ｕ字状の折り返し通路１７ａに連通しており、前記燃焼排ガスの白煙が発生しやすい状況を検知するための白煙検知手段２１を設け、白煙検知手段２１による検知時に給気ファン３からの風量を増加させることを特徴としており、このように構成することで、特に白煙が発生しやすい寒冷地などにおいて、白煙が発生する可能性が高くなった場合は、白煙検知手段２１により燃焼排ガスの白煙が発生しやすい状況を検知して給気ファン３からの風量を増加させることによって、燃焼排ガスが希釈されて空気比が上がり、白煙の発生を抑えることができる。
【０００８】
また請求項４記載の発明にあっては、燃焼室４に設置されるガスバーナー５と、ガスバーナー５に空気を供給する給気ファン３と、ガスバーナー５の熱により水を昇温させる一次熱交換器６と、燃焼室４からの燃焼排ガスを外部に排出する排気通路１０と、排気通路１０内で燃焼排ガスの潜熱を回収する熱交換器７とからなる潜熱回収型熱源機１を複数個備え、前記複数個の潜熱回収型熱源機１を構成する風呂給湯器１Ａの給湯排気通路１０と給湯暖房機１Ｂの暖房排気通路１０ａを別々にし、給湯排気通路１０の長手方向の一端は略Ｕ字状の折り返し通路１７に連通していると共に、暖房排気通路１０ａの長手方向の一端は略Ｕ字状の折り返し通路１７ａに連通しており、両排気通路１０，１０ａの出口１０ｂをそれぞれ風呂給湯器１Ａ及び給湯暖房機１Ｂの機器ケーシング３７の排気口３８に面して配置すると共に、排気口３８に面して１つの外付けの希釈用ファン１９を設置して、両排気通路１０，１０ａの出口１０ｂ側に向けて希釈用空気を供給するようにしたことを特徴としており、このように構成することで、希釈用ファン１９を排気通路１０，１０ａの出口１０ｂ側に設置するだけの簡単な構造で、燃焼排ガスと希釈空気とがよく混合して白煙の発生を抑えることができる。
【０００９】
【発明の実施の形態】
以下、本発明を添付図面に示す実施形態に基づいて説明する。
【００１０】
本実施形態の潜熱回収型熱源機１は、図１に示すように、風呂給湯器１Ａと給湯暖房機１Ｂとで構成されていると共に、１つの共通の混合排気通路２を備えている。なお潜熱回収型熱源機１の種類は、これら風呂給湯器１Ａや給湯暖房機１Ｂに限られるものではなく、また潜熱回収型熱源機１の数も２つに限られるものではない。
【００１１】
上記風呂給湯器１Ａは、ガスバーナー５を設置した燃焼室４の上部には顕熱回収用の一次熱交換器６が配置されていると共に、燃焼室４の上部に連通する給湯排気通路１０内には潜熱回収用の二次熱交換器７が配置されている。一次熱交換器６の一端には給湯管路９が接続され、二次熱交換器７の一端には給水管路８が接続され、二次熱交換器７の他端と一次熱交換器６の他端とが接続管４３を介して互いに接続されている。接続管４３はバイパス管路１４を介して給湯管路９にバイパス接続されている。そして、給湯側の給気ファン３により燃焼室４内に新鮮な空気を供給してガスバーナー５を燃焼させると共に、給水管路８から給水することで、給水管路８から二次熱交換器７内に入る水と燃焼室４から排気通路１０内に排出される燃焼排ガスの熱とを熱交換させて、水温をある程度上昇させることができるものであり、さらに二次熱交換器７から接続管４３を通って一次熱交換器６内に入る低温の湯と燃焼室４内のガスバーナー５の熱とを熱交換させて、給湯管路９に高温の湯を供給できるようになっている。またこのとき、一次熱交換器６の両端を短絡させるためのバイパス管１４を開閉弁等によって開閉することによって、二次熱交換器７からの低温の湯と一次熱交換器６からの高温の湯とを切り換えて、給湯管路９内に供給できるようになっている。
【００１２】
上記給湯管路９は、給湯分岐管１３を介して風呂の追い炊き用の戻り管１２に接続されており、この戻り管１２は追い炊き用の熱交換器２０を介して追い炊き用の往路管１１に接続されている。本例では、追い炊き用の熱交換器２０は、給湯暖房機１Ｂの高温往路管２８に設けられており、この高温往路管２８内の熱により追い炊き用の往路管１１内の水を昇温させることで、給湯暖房機１Ｂのガスバーナー５ａを利用して、風呂の追い炊きができる構造となっている。
【００１３】
また、風呂給湯器１Ａの給湯排気通路１０の先端は、略Ｕ字状に折り返された折り返し通路１７の一端に連通している。折り返し通路１７の他端は、給湯排気通路１０の上面に沿って横設された混合排気通路２の一端に連通している。なお折り返し通路１７の底面側には、潜熱回収により二次熱交換器７に結露した水滴を受けるためのドレン受け３０が設けられている。ドレン受け３０には水勾配を設けてあり、水勾配の下流にドレン受け３０で受けた結露水を排出するためのドレン排水管１５の一端が接続されている。ドレン排水管１５の他端は、酸性水あるいは強酸性水などの結露水に中和剤を添加して中和するための中和器１６を介して、外部排出管３１に接続されている。
【００１４】
一方、給湯暖房機１Ｂは、基本的には上記風呂給湯器１Ａと同様であり、対応する部分には同一符号に添字ａを付して詳しい説明は省略する。暖房用のガスバーナー５ａが設置される燃焼室４ａ内には、顕熱回収用の一次熱交換器６ａが配置され、燃焼室４ａの上部に連通する暖房排気通路１０ａ内には潜熱回収用の二次熱交換器７ａが配置されている。二次熱交換器７ａの一端には開閉弁２４で開閉される暖房戻り管２５が接続されており、二次熱交換器７ａの他端は接続管４１を介して暖房タンク１８の入口に接続されている。そして、暖房側の給気ファン３ａによりガスバーナー５ａを燃焼させると共に開閉弁２４を開いて、ポンプ（図示せず）を駆動することで、暖房戻り管２５内から二次熱交換器７ａ内に入る水と燃焼室４ａから暖房排気通路１０ａ内に排出される燃焼排ガスの熱とを熱交換させて、水の温度をある程度上昇させてから暖房タンク１８内に溜められるようになっている。なお図中の４０は暖房タンク１８のオーバーフロー管である。
【００１５】
暖房タンク１８の出口は、接続管２３を介して一次熱交換器６ａの一端に接続されており、この一次熱交換器６ａの他端に高温往路管２８が接続されている。暖房タンク１８からの湯（又は水）は、一次熱交換器６で燃焼室４内のガスバーナー５の熱と熱交換されて、給湯管路９に高温の湯を供給できるようになっている。また上記接続管２３には低温往路管２９が接続されており、この低温往路管２９と高温往路管２８とが流量調整弁５０等を介して連通している
上記風呂給湯器１Ａの給湯排気通路１０及び給湯暖房機１Ｂの暖房排気通路１０ａの上方には、一本の直管状をした混合排気通路２が横設されており、給湯排気通路１０と暖房排気通路１０ａの両方が混合排気通路２にそれぞれ連通している。混合排気通路２は、給湯排気通路１０及び暖房排気通路１０ａからのそれぞれの燃焼排ガスを混合することにより白煙の発生を抑える機能を有しており、混合排気通路２の中央側の上面には上方に開口した排気筒３６が設けられている。混合排気通路２の長手方向の一端は給湯排気通路１０の折り返し通路１７に連通していると共に、他端は暖房排気通路１０ａの折り返し通路１７ａに連通しており、両排気通路１０からの燃焼排ガスが混合排気通路２の図１のイで示す部分で混合された後で、排気筒３６から屋外へ排出されるようになっている。
【００１６】
しかして、潜熱回収用の熱交換器６を備える風呂給湯器１Ａ及び給湯暖房機１Ｂ等のような潜熱回収型の熱源機において、給湯側の給気ファン３による燃焼で生じた燃焼排ガスと、暖房側の給気ファン３ａによる燃焼で生じた燃焼排ガスとを、外部に排出する前に混合排気通路２内で混合させ、その後、混合気を外部に排出するようにしたので、各排気通路１０，１０ａからの燃焼排ガスが希釈されて空気比が上がり、これに伴い燃焼排ガスの露点温度が低くなり、白煙の発生を抑えることができる。しかも、両排気通路１０，１０ａの風量をミックスさせているので、例えば風量を増やすために給気ファン３，３ａの回転数を上げたりする必要もない。
【００１７】
ところで、風呂給湯器１Ａと給湯暖房機１Ｂとを同時燃焼させている時でも、片方からしか白煙が発生しないケースが多い。このことから、上記のように混合排気通路２内で双方の燃焼排ガスを混合することによって、白煙の発生する燃焼排ガスの露点温度を下げて、白煙の発生を防止することができる。つまり、複数個の給気ファン３，３ａによる燃焼時でも、別々に排気させずにミックスさせて排気させることによって、白煙の発生確率を低減させることができるものである。
【００１８】
また、風呂給湯器１Ａのみ又は給湯暖房機１Ｂのみの片側運転時においても、給湯側の給気ファン３と暖房側の給気ファン３ａの双方を常に回転させておくことによって、白煙の発生を常に防止できるようになる。つまり、どれか１つの給気ファン３（又は３ａ）による単独燃焼の場合でも、非燃焼側の給気ファン３ａ（又は３）を常に回転させておくことによって、混合排気通路２内のトータルな風量が増加し、これにより燃焼排ガスの露点温度が一層低下して白煙防止効果が顕著となる。またこのような単独燃焼時において、非燃焼側の給気ファン３ａ（又は３）の回転数を上げれば、燃焼排ガスの露点温度が更に下がり、白煙発生をより一層抑えることが可能となる。
【００１９】
図２、図３は、他の実施形態を示しており、潜熱回収型熱源機１の機器ケーシング３７の外部に、排気口３８側に向けて希釈用ファン１９を設置した場合を示している。本例では、図２に示すように、風呂給湯器１Ａの排気通路１０と給湯暖房機１Ｂの暖房排気通路１０ａを別々にし、各排気通路１０，１０ａの出口１０ｂ，１０ｂを、図３に示す機器ケーシング３７の横長の排気口３８に面して配置すると共に、排気口３８に面して１つの外付けの希釈用ファン１９を設置している点で、図１の混合排気通路２を設けた構造とは異なっている。他の構成は図１と同様であり、対応する部分には同一符号を付して詳しい説明は省略する。しかして、外付けの希釈用ファン１９の風向きを、燃焼排ガスとよく混合するように排気方向に対してできるだけ直交させるようにして、機器ケーシング３７を回転駆動させると、排気口３８からの排出される燃焼排ガスが希釈用ファン１９からの空気によって希釈される。これにより、燃焼排ガスの露点温度が下がり、白煙の発生を抑えることができる。しかも機器ケーシング３７に希釈用ファン１９を後付けするだけでよく、既存の潜熱回収型熱源機の白煙防止にも容易に対応できるものである。なお本例では１つの機器ケーシング３７内に２つの潜熱回収型熱源機１を収納する場合を例示したが、もちろん、１個の潜熱回収型熱源機１を収納したものであってもよい。また希釈用ファン１９は機器ケーシング３７に外付けされる場合に限らず、機器ケーシング３７の内側の排気口３８近傍位置に取り付けてもよいものである。
【００２０】
図４、図５は、単独の給気ファン３を備えた潜熱回収型熱源機１において、燃焼排ガスの白煙が発生しやすい状況を検知するための白煙検知手段２１を設けることにより、白煙検知手段２１による検知時に給気ファン３からの風量を増加させるようにした場合を示している。ここでは、排気通路１０の排気口１０Ａは側方に開口しており、排気口１０Ａの手前側にドレン受け３０で受けた結露水を排出するドレン排水管１５が接続されている。他の構成は図１の風呂給湯器１Ａとほぼ同様であり、対応する部分には同一符号を付して詳しい説明は省略する。本例では、白煙検知手段２１として、外気温を検知する外気温度センサー、或いは燃焼量（ガス消費量）を検知する検知センサー等を用いることができ、マイクロコンピューター等によって実現される制御部２２により、外気温度やガス消費量等の情報をもとに白煙が発生しやすい状況を検知するようにする。そして、白煙が発生する可能性が高くなった場合には、給気ファン３の回転数をアップさせることにより、空気比が高くなって露点温度が低下し、白煙の発生を抑えることができる。なお図４の例では単独ファン方式を例示しているが、前記図１〜図３のように２つの給気ファン３，３ａを備えた構造において、白煙が発生しやすい状況になったときに２つの給気ファン３，３ａの回転数を上げたり、或いは一方の給気ファン３又は３ａの回転数のみを上げることにより、風量を増加させるようにしてもよいものであり、この場合においても燃焼排ガスの露点温度が下がり、白煙が発生しそうな状況下で白煙の発生を未然に抑えることができるものである。また、白煙が発生しやすい寒冷地などの状況に応じて、外気温センサー等をオプションとして付設することで、既存の潜熱回収型熱源機にも容易に適用できるものとなる。
【００２１】
なお、上記外気温センサーに代えて、温度センサーと湿度センサーとを組み合わせて構成される温湿度センサーを用いてもよく、この場合、温湿度センサーによって外気状態をより正確に検知できるようになり、白煙防止により効果的となる。
【００２２】
【発明の効果】
上述のように請求項１記載の発明にあっては、燃焼室に設置されるガスバーナーと、ガスバーナーに空気を供給する給気ファンと、燃焼室に設置されるガスバーナーと、ガスバーナーに空気を供給する給気ファンと、ガスバーナーの熱により水を昇温させる一次熱交換器と、燃焼室からの燃焼排ガスを外部に排出する排気通路と、排気通路内で燃焼排ガスの潜熱を回収する二次熱交換器とからなる潜熱回収型熱源機を複数個備え、前記複数個の潜熱回収型熱源機を構成する風呂給湯器の給湯排気通路及び給湯暖房機の暖房排気通路に、一本の混合排気通路が付設されており、混合排気通路の上面に開口した排気筒が設けられており、混合排気通路の長手方向の一端は給湯排気通路の略Ｕ字状の折り返し通路に連通していると共に、他端は暖房排気通路の略Ｕ字状の折り返し通路に連通しているので、風呂給湯器及び給湯暖房機においてそれぞれ給気ファンよる燃焼で生じた燃焼排ガスを給湯排気通路及び暖房排気通路のそれぞれの略Ｕ字状の折り返し通路を経て混合排気通路内で混合させることによって燃焼排ガスが希釈されて、露点温度が低下する。従って、燃焼排ガスの潜熱を回収して高効率化を図るものでありながら、白煙の発生を抑えることができる。しかも、風量を増やすために給気ファンの回転数を上げる必要もないので、運転コストの低減を図ることができる。
【００２３】
また請求項２記載の発明は、請求項１記載の効果に加えて、上記複数個の潜熱回収型熱源機のうち、いずれか１個の潜熱回収型熱源機の単独燃焼時に、非燃焼側の他の潜熱回収型熱源機の給気ファンを回転させるようにしたので、どれか１つの給気ファンによる単独燃焼の場合であっても、非燃焼側の給気ファンを停止させずに常に回転させておくことによって、混合排気通路内の風量が増加し、燃焼排ガスの露点温度が一層低下して白煙防止効果が顕著となる。また、給気ファンの回転量を変えるだけでよいので、潜熱回収型熱源機自体の構造を変える必要がなく、低コストで、白煙発生確率を低減させることができる。
【００２４】
また請求項３記載の発明は、燃焼室に設置されるガスバーナーと、ガスバーナーに空気を供給する給気ファンと、ガスバーナーの熱により水を昇温させる一次熱交換器と、燃焼室からの燃焼排ガスを外部に排出する排気通路と、排気通路内で燃焼排ガスの潜熱を回収する二次熱交換器とからなる潜熱回収型熱源機を複数個備え、前記複数個の潜熱回収型熱源機を構成する風呂給湯器の給湯排気通路及び給湯暖房機の暖房排気通路に、一本の混合排気通路が付設されており、混合排気通路の上面に開口した排気筒が設けられており、混合排気通路の長手方向の一端は給湯排気通路の略Ｕ字状の折り返し通路に連通していると共に、他端は暖房排気通路の略Ｕ字状の折り返し通路に連通しており、前記燃焼排ガスの白煙が発生しやすい状況を検知するための白煙検知手段を設け、白煙検知手段による検知時に給気ファンからの風量を増加させるようにしたので、特に白煙が発生しやすい寒冷地などにおいて、白煙が発生する可能性が高くなった場合は、白煙検知手段が燃焼排ガスの白煙が発生しやすい状況を検知して給気ファンからの風量を増加させることによって、燃焼排ガスが希釈されて空気比が上がり、従って、燃焼排ガスの潜熱を回収して高効率化を図るものでありながら、白煙の発生を抑えることができる。
【００２５】
また請求項４記載の発明は、燃焼室に設置されるガスバーナーと、ガスバーナーに空気を供給する給気ファンと、ガスバーナーの熱により水を昇温させる一次熱交換器と、燃焼室からの燃焼排ガスを外部に排出する排気通路と、排気通路内で燃焼排ガスの潜熱を回収する二次熱交換器とからなる潜熱回収型熱源機を複数個備え、前記複数個の潜熱回収型熱源機を構成する風呂給湯器の給湯排気通路と給湯暖房機の暖房排気通路を別々にし、給湯排気通路の長手方向の一端は略Ｕ字状の折り返し通路に連通していると共に、暖房排気通路の長手方向の一端は略Ｕ字状の折り返し通路に連通しており、両排気通路の出口をそれぞれ風呂給湯器及び給湯暖房機の機器ケーシングの排気口に面して配置すると共に、排気口に面して１つの外付けの希釈用ファンを設置して、両排気通路の出口側に向けて希釈用空気を供給するようにしたので、希釈用ファンの風向きを排気通路の出口側に向けるだけで燃焼排ガスと希釈空気とがよく混合するようになり、燃焼排ガスの露点温度を下げることができ、従って、燃焼排ガスの潜熱を回収して高効率化を図るものでありながら、白煙の発生を抑えることができる。さらに給気ファンの回転数を上げて風量を増加させる場合と比較して、希釈用ファンを設置するだけでよいために、簡単な構造で白煙防止効果が得られるものである。
【図面の簡単な説明】
【図１】本発明の実施形態の一例を示す概略構成図である。
【図２】他の実施形態を示す概略構成図である。
【図３】同上の機器ケーシングに希釈用ファンを外付けした場合の説明図である。
【図４】更に他の実施形態を示す概略構成図である。
【図５】同上のブロック図である。
【符号の説明】
１潜熱回収型熱源機
２混合排気通路
３，３ａ給気ファン
４，４ａ燃焼室
５，５ａガスバーナー
６，６ａ一次熱交換器
７，７ａ二次熱交換器
１０，１０ａ排気通路
１９希釈用ファン
２１白煙検知手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a white smoke prevention structure of a latent heat recovery type heat source machine.
[0002]
[Prior art]
Conventionally, for example, in Japanese Patent Laid-Open No. 6-307624, a heat exchanger for recovering latent heat is provided in an exhaust passage of a bath water heater, a hot water heater or the like, thereby depriving waste heat of combustion exhaust gas and recovering to latent heat. There is known a latent heat recovery type heat source machine which is designed to improve efficiency by the above.
[0003]
[Problems to be solved by the invention]
By the way, in the latent heat recovery type heat source machine as described above, the temperature of the combustion exhaust gas discharged from the exhaust passage is lowered, so that the water vapor contained in the combustion exhaust gas in the vicinity of the exhaust port is whitened. May cause white smoke. When such white smoke is generated, there are cases where it is mistaken for a fire, which is preferable from an aesthetic point of view, and it is desired to suppress white smoke.
[0004]
The present invention was invented in view of the problems of the above-described conventional example, and the object of the present invention is to recover the latent heat of the combustion exhaust gas to improve the efficiency, and to improve the temperature of the combustion exhaust gas. The purpose is to provide a white smoke prevention structure for a latent heat recovery type heat source machine that can suppress the generation of white smoke due to a decrease in the temperature. Another object is to have a simple structure even in situations where white smoke is likely to be generated. An object of the present invention is to provide a white smoke prevention structure for a latent heat recovery type heat source machine that can suppress generation of white smoke.
[0005]
[Means for Solving the Problems]
In order to solve the above problem, in the invention according to claim 1, the gas burner 5 installed in the combustion chamber 4, the air supply fan 3 for supplying air to the gas burner 5, and the heat of the gas burner 5 are used. Latent heat recovery comprising a primary heat exchanger 6 for raising the temperature of water, an exhaust passage 10 for discharging combustion exhaust gas from the combustion chamber 4 to the outside, and a heat exchanger 7 for recovering latent heat of the combustion exhaust gas in the exhaust passage 10 There are a plurality of mold heat source devices 1, and a single mixed exhaust passage 2 is provided in the hot water supply / exhaust passage 10 of the bath water heater 1 A and the heating / exhaust passage 10 a of the hot water heater / heater 1 B constituting the plurality of latent heat recovery type heat source devices 1. And an exhaust cylinder 36 opened on the upper surface of the mixed exhaust passage 2 is provided, and one end in the longitudinal direction of the mixed exhaust passage 2 communicates with the substantially U-shaped folded passage 17 of the hot water supply exhaust passage 10. And the other end is heated and exhausted It is characterized by communicating with the substantially U-shaped folded passage 17a of the road 10a, With this arrangement, caused by the respective air supply fan 3 by the combustion in the bath water heater 1A and hot-water heating units 1B By mixing the combustion exhaust gas in the mixed exhaust passage 2 through the substantially U-shaped folded passages 17 and 17a of the hot water supply exhaust passage 10 and the heating exhaust passage 10a , the combustion exhaust gas is diluted and the dew point temperature is lowered. Therefore, the generation of white smoke can be suppressed while improving the efficiency by recovering the latent heat of the combustion exhaust gas.
[0006]
In the invention according to claim 2, when any one of the plurality of latent heat recovery type heat source units 1 is burned alone, another latent heat recovery type on the non-combustion side is provided. It is preferable to rotate the air supply fan 3 of the heat source unit 1. In this case, even in the case of single combustion by any one of the air supply fans 3, the air volume in the mixed exhaust passage 2 is increased to prevent white smoke. Can be increased.
[0007]
In the invention according to claim 3, the gas burner 5 installed in the combustion chamber 4, the air supply fan 3 for supplying air to the gas burner 5, and the primary temperature for raising the temperature of the water by the heat of the gas burner 5. A plurality of latent heat recovery type heat source devices 1 each including a heat exchanger 6, an exhaust passage 10 for discharging combustion exhaust gas from the combustion chamber 4 to the outside, and a heat exchanger 7 for recovering latent heat of the combustion exhaust gas in the exhaust passage 10 are provided. A single mixed exhaust passage 2 is attached to the hot water supply / exhaust passage 10 of the hot water heater 1A and the heating / exhaust passage 10a of the hot water heater 1B that constitute the plurality of latent heat recovery type heat source devices 1; An exhaust cylinder 36 opened on the upper surface of the mixed exhaust passage 2 is provided, and one end in the longitudinal direction of the mixed exhaust passage 2 communicates with the substantially U-shaped folded passage 17 of the hot water supply exhaust passage 10 and the other end. Is a substantially U-shaped heating exhaust passage 10a Communicates with the folded path 17a, provided white smoke detecting means 21 for detecting a situation in which white smoke is likely to occur in the flue gas, increasing the air volume from the air supply fan 3 during detection by white smoke detector 21 With this configuration, when there is a high possibility that white smoke is generated, particularly in a cold district where white smoke is likely to be generated, the white smoke detection means 21 causes the combustion exhaust gas to be generated. By detecting a situation in which white smoke is likely to be generated and increasing the air volume from the air supply fan 3, the combustion exhaust gas is diluted, the air ratio is increased, and generation of white smoke can be suppressed.
[0008]
In the invention according to claim 4, the gas burner 5 installed in the combustion chamber 4, the air supply fan 3 for supplying air to the gas burner 5, and the primary temperature for raising the temperature of the water by the heat of the gas burner 5. A plurality of latent heat recovery type heat source devices 1 each including a heat exchanger 6, an exhaust passage 10 for discharging combustion exhaust gas from the combustion chamber 4 to the outside, and a heat exchanger 7 for recovering latent heat of the combustion exhaust gas in the exhaust passage 10 are provided. The hot water supply / exhaust passage 10 of the hot water heater 1A and the heating / exhaust passage 10a of the hot water heater 1B constituting the plurality of latent heat recovery type heat source devices 1 are separated, and one end in the longitudinal direction of the hot water supply / exhaust passage 10 is substantially the same. The heating exhaust passage 10a communicates with the U-shaped folding passage 17 and one end in the longitudinal direction of the heating / exhaust passage 10a communicates with the substantially U-shaped folding passage 17a. Water heater 1A and While placed facing the outlet 38 of the apparatus casing 37 of the hot water heater 1B, by installing a one dilution fan 19 of the external face the exhaust port 38, the outlet 10b of the two exhaust passages 10,10a It is characterized in that dilution air is supplied toward the side . With this configuration, the dilution fan 19 is simply installed on the outlet 10b side of the exhaust passages 10 and 10a. The combustion exhaust gas and the diluted air can be mixed well to suppress the generation of white smoke.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described based on embodiments shown in the accompanying drawings.
[0010]
As shown in FIG. 1, the latent heat recovery type heat source device 1 of the present embodiment includes a bath water heater 1 A and a hot water heater 1 B, and includes a common mixed exhaust passage 2. The type of the latent heat recovery type heat source unit 1 is not limited to the bath water heater 1A and the hot water heater 1B, and the number of latent heat recovery type heat source units 1 is not limited to two.
[0011]
In the bath water heater 1A, a primary heat exchanger 6 for recovering sensible heat is disposed in the upper part of the combustion chamber 4 in which the gas burner 5 is installed, and in the hot water supply exhaust passage 10 communicating with the upper part of the combustion chamber 4. Is provided with a secondary heat exchanger 7 for recovering latent heat. A hot water supply line 9 is connected to one end of the primary heat exchanger 6, a water supply line 8 is connected to one end of the secondary heat exchanger 7, and the other end of the secondary heat exchanger 7 and the primary heat exchanger 6 are connected. Are connected to each other via a connecting pipe 43. The connecting pipe 43 is bypass-connected to the hot water supply pipe 9 via the bypass pipe 14. Then, fresh air is supplied into the combustion chamber 4 by the air supply fan 3 on the hot water supply side to burn the gas burner 5, and water is supplied from the water supply line 8, whereby the secondary heat exchanger is supplied from the water supply line 8. 7, the water temperature can be raised to some extent by exchanging heat between the water entering in the chamber 7 and the heat of the combustion exhaust gas discharged from the combustion chamber 4 into the exhaust passage 10, and further connected from the secondary heat exchanger 7. The hot water entering the primary heat exchanger 6 through the pipe 43 and the heat of the gas burner 5 in the combustion chamber 4 can be heat-exchanged to supply hot water to the hot water supply line 9. . At this time, the bypass pipe 14 for short-circuiting both ends of the primary heat exchanger 6 is opened and closed by an on-off valve or the like, so that the low temperature hot water from the secondary heat exchanger 7 and the high temperature from the primary heat exchanger 6 are heated. The hot water can be switched and supplied into the hot water supply pipe 9.
[0012]
The hot water supply pipe 9 is connected to a return pipe 12 for reheating the bath via a hot water supply branch pipe 13, and this return pipe 12 is connected to the return path for reheating via a heat exchanger 20 for additional cooking. Connected to the tube 11. In this example, the heat exchanger 20 for additional cooking is provided in the high temperature outward pipe 28 of the hot water heater 1B, and the heat in the outgoing pipe 11 for additional cooking is raised by the heat in the high temperature outgoing pipe 28. By heating, the structure is such that the bath can be reheated using the gas burner 5a of the hot water heater 1B.
[0013]
The tip of the hot water supply / exhaust passage 10 of the bath water heater 1 A communicates with one end of a folded passage 17 that is folded in a substantially U shape. The other end of the return passage 17 communicates with one end of the mixed exhaust passage 2 that is provided along the upper surface of the hot water supply exhaust passage 10. A drain receiver 30 for receiving water droplets condensed on the secondary heat exchanger 7 by latent heat recovery is provided on the bottom surface side of the return passage 17. The drain receiver 30 is provided with a water gradient, and one end of a drain drain pipe 15 for discharging condensed water received by the drain receiver 30 is connected downstream of the water gradient. The other end of the drain drain pipe 15 is connected to an external discharge pipe 31 via a neutralizer 16 for neutralizing the condensed water such as acid water or strong acid water by adding a neutralizer.
[0014]
On the other hand, the hot water heater 1B is basically the same as the bath water heater 1A described above, and the corresponding parts are denoted by the suffix “a” and detailed description thereof is omitted. A primary heat exchanger 6a for recovering sensible heat is disposed in the combustion chamber 4a where the gas burner 5a for heating is installed, and a latent heat recovery passage is provided in the heating exhaust passage 10a communicating with the upper portion of the combustion chamber 4a. A secondary heat exchanger 7a is arranged. A heating return pipe 25 that is opened and closed by an on-off valve 24 is connected to one end of the secondary heat exchanger 7a, and the other end of the secondary heat exchanger 7a is connected to the inlet of the heating tank 18 through a connection pipe 41. Has been. Then, the gas burner 5a is combusted by the air supply fan 3a on the heating side, and the on-off valve 24 is opened to drive the pump (not shown), so that the heating return pipe 25 and the secondary heat exchanger 7a are driven. Heat is exchanged between the entering water and the heat of the combustion exhaust gas discharged from the combustion chamber 4a into the heating exhaust passage 10a to increase the temperature of the water to some extent, and then stored in the heating tank 18. Reference numeral 40 in the figure denotes an overflow pipe of the heating tank 18.
[0015]
The outlet of the heating tank 18 is connected to one end of the primary heat exchanger 6a through a connecting pipe 23, and a high temperature forward pipe 28 is connected to the other end of the primary heat exchanger 6a. Hot water (or water) from the heating tank 18 is heat-exchanged with the heat of the gas burner 5 in the combustion chamber 4 by the primary heat exchanger 6 so that hot water can be supplied to the hot water supply line 9. . Further, a low temperature forward pipe 29 is connected to the connection pipe 23, and the low temperature forward pipe 29 and the high temperature forward pipe 28 communicate with each other via a flow rate adjusting valve 50 or the like. 10 and the heating exhaust passage 10a of the hot water heater 1B are provided with a single straight tube-like mixed exhaust passage 2 and both the hot water supply exhaust passage 10 and the heating exhaust passage 10a are mixed exhaust passage 2. To communicate with each other. The mixed exhaust passage 2 has a function of suppressing the generation of white smoke by mixing the respective combustion exhaust gases from the hot water supply exhaust passage 10 and the heating exhaust passage 10a. An exhaust cylinder 36 opened upward is provided. One end in the longitudinal direction of the mixed exhaust passage 2 communicates with the return passage 17 of the hot water supply exhaust passage 10 and the other end communicates with the return passage 17a of the heating exhaust passage 10a. Are mixed at the portion of the mixed exhaust passage 2 indicated by a in FIG. 1 and then discharged from the exhaust pipe 36 to the outside.
[0016]
Thus, in a latent heat recovery type heat source machine such as a bath water heater 1A and a hot water heater 1B provided with a heat exchanger 6 for latent heat recovery, combustion exhaust gas generated by combustion by the hot water supply air fan 3; Combustion exhaust gas generated by the combustion by the air supply fan 3a on the heating side is mixed in the mixed exhaust passage 2 before being discharged to the outside, and then the mixed gas is discharged to the outside. , 10a is diluted, the air ratio is increased, and the dew point temperature of the combustion exhaust gas is lowered accordingly, and the generation of white smoke can be suppressed. Moreover, since the air volumes of both the exhaust passages 10 and 10a are mixed, it is not necessary to increase the rotational speed of the air supply fans 3 and 3a in order to increase the air volume, for example.
[0017]
By the way, even when the hot water heater 1A and the hot water heater 1B are simultaneously burned, white smoke is often generated from only one side. From this, by mixing both combustion exhaust gas in the mixed exhaust passage 2 as described above, the dew point temperature of the combustion exhaust gas generated by white smoke can be lowered, and the generation of white smoke can be prevented. In other words, even when combustion is performed by the plurality of air supply fans 3 and 3a, the probability of white smoke generation can be reduced by mixing and exhausting separately without exhausting separately.
[0018]
Also, even when only one side operation of the bath water heater 1A or only the hot water heater 1B is performed, white smoke is generated by always rotating both the hot water supply air fan 3 and the heating air supply fan 3a. Can always be prevented. That is, even in the case of single combustion by any one of the air supply fans 3 (or 3a), the non-combustion side air supply fan 3a (or 3) is always rotated, so that the total exhaust gas in the mixed exhaust passage 2 can be increased. The air volume increases, thereby further reducing the dew point temperature of the combustion exhaust gas, and the white smoke prevention effect becomes remarkable. Further, at the time of such single combustion, if the rotational speed of the non-combustion side supply fan 3a (or 3) is increased, the dew point temperature of the combustion exhaust gas is further lowered, and the generation of white smoke can be further suppressed.
[0019]
2 and 3 show another embodiment, and shows a case where the dilution fan 19 is installed on the outside of the equipment casing 37 of the latent heat recovery type heat source unit 1 toward the exhaust port 38 side. In this example, as shown in FIG. 2, the exhaust passage 10 of the bath water heater 1A and the heating exhaust passage 10a of the hot water heater 1B are separated, and the outlets 10b and 10b of the exhaust passages 10 and 10a are shown in FIG. The mixed exhaust passage 2 of FIG. 1 is provided in that the device casing 37 is disposed facing the horizontally long exhaust port 38 and one external dilution fan 19 is installed facing the exhaust port 38. The structure is different. Other configurations are the same as those in FIG. 1, and corresponding portions are denoted by the same reference numerals, and detailed description thereof is omitted. Thus, when the equipment casing 37 is driven to rotate so that the wind direction of the external dilution fan 19 is orthogonal to the exhaust direction so as to mix well with the combustion exhaust gas, the exhaust is discharged from the exhaust port 38. The combustion exhaust gas is diluted by the air from the dilution fan 19. Thereby, the dew point temperature of combustion exhaust gas falls and generation | occurrence | production of white smoke can be suppressed. Moreover, it is only necessary to attach the dilution fan 19 to the equipment casing 37, and it can easily cope with white smoke prevention of the existing latent heat recovery type heat source machine. In this example, the case where two latent heat recovery type heat source devices 1 are accommodated in one device casing 37 is illustrated, but of course, one latent heat recovery type heat source device 1 may be accommodated. Further, the dilution fan 19 is not limited to being externally attached to the device casing 37, but may be attached to a position near the exhaust port 38 inside the device casing 37.
[0020]
FIGS. 4 and 5 show a white smoke detection means 21 for detecting a situation in which white smoke of combustion exhaust gas is likely to be generated in the latent heat recovery type heat source apparatus 1 having a single air supply fan 3. The case where the air volume from the air supply fan 3 is increased at the time of detection by the smoke detection means 21 is shown. Here, the exhaust port 10A of the exhaust passage 10 is open to the side, and a drain drain pipe 15 for discharging the condensed water received by the drain receiver 30 is connected to the front side of the exhaust port 10A. Other configurations are substantially the same as those of the bath water heater 1A of FIG. 1, and corresponding portions are denoted by the same reference numerals and detailed description thereof is omitted. In this example, as the white smoke detection means 21, an outside air temperature sensor for detecting the outside air temperature, a detection sensor for detecting the combustion amount (gas consumption), or the like can be used, and the control unit 22 realized by a microcomputer or the like. Thus, a situation in which white smoke is likely to be generated is detected based on information such as outside air temperature and gas consumption. And when possibility that white smoke will generate | occur | produce becomes high, by raising the rotation speed of the air supply fan 3, an air ratio becomes high and a dew point temperature falls, and generation | occurrence | production of white smoke can be suppressed. it can. In the example of FIG. 4, the single fan system is exemplified, but when the structure including the two air supply fans 3 and 3 a as shown in FIGS. 1 to 3 is in a state where white smoke is likely to be generated. In this case, the air volume may be increased by increasing the rotational speed of the two air supply fans 3 and 3a or by increasing only the rotational speed of one of the air supply fans 3 or 3a. However, it is possible to suppress the generation of white smoke under a situation where the dew point temperature of the combustion exhaust gas is lowered and white smoke is likely to be generated. Moreover, according to the situation such as a cold district where white smoke is likely to be generated, an external temperature sensor or the like is attached as an option, so that it can be easily applied to an existing latent heat recovery type heat source machine.
[0021]
In addition, instead of the outside air temperature sensor, a temperature / humidity sensor configured by combining a temperature sensor and a humidity sensor may be used, and in this case, the outside air state can be more accurately detected by the temperature / humidity sensor, Effective by preventing white smoke.
[0022]
【The invention's effect】
As described above, in the first aspect of the invention, the gas burner installed in the combustion chamber, the air supply fan for supplying air to the gas burner, the gas burner installed in the combustion chamber, and the gas burner An air supply fan that supplies air, a primary heat exchanger that raises the temperature of water by the heat of the gas burner, an exhaust passage that discharges the combustion exhaust gas from the combustion chamber to the outside, and the latent heat of the combustion exhaust gas is recovered in the exhaust passage A plurality of latent heat recovery type heat source devices comprising secondary heat exchangers , one in the hot water supply exhaust passage of the bath water heater and the heating exhaust passage of the hot water heater constituting the plurality of latent heat recovery type heat source devices A mixed exhaust passage is provided, and an exhaust cylinder opened on the upper surface of the mixed exhaust passage is provided, and one end in the longitudinal direction of the mixed exhaust passage communicates with a substantially U-shaped folded passage of the hot water supply exhaust passage. And the other end is heated Since the communication with the substantially U-shaped folded path of the gas passage, a bath water heater and each of the substantially U-shaped hot water exhaust passage and heating the exhaust passage of the combustion exhaust gas produced in each air supply fan by burning the hot water heater The exhaust gas is diluted by mixing in the mixed exhaust passage through the folded-back passage, and the dew point temperature is lowered. Therefore, the generation of white smoke can be suppressed while improving the efficiency by recovering the latent heat of the combustion exhaust gas. In addition, since it is not necessary to increase the rotation speed of the air supply fan in order to increase the air volume, the operating cost can be reduced.
[0023]
In addition to the effect described in claim 1, the invention described in claim 2 is the non-combustion side of the plurality of latent heat recovery type heat source units when the single combustion of any one of the plurality of latent heat recovery type heat source units is performed. Since the air supply fan of other latent heat recovery type heat source machine is rotated, even in the case of single combustion by any one air supply fan, it always rotates without stopping the air supply fan on the non-combustion side By doing so, the air volume in the mixed exhaust passage is increased, the dew point temperature of the combustion exhaust gas is further lowered, and the white smoke prevention effect becomes remarkable. Further, since it is only necessary to change the rotation amount of the air supply fan, there is no need to change the structure of the latent heat recovery type heat source unit itself, and the white smoke generation probability can be reduced at low cost.
[0024]
According to a third aspect of the present invention, there is provided a gas burner installed in the combustion chamber, an air supply fan for supplying air to the gas burner, a primary heat exchanger for raising the temperature of water by the heat of the gas burner, and a combustion chamber. A plurality of latent heat recovery type heat source devices , each of which has a plurality of latent heat recovery type heat source devices , each of which includes an exhaust passage that discharges the combustion exhaust gas to the outside and a secondary heat exchanger that recovers latent heat of the combustion exhaust gas in the exhaust passage. A mixed exhaust passage is attached to the hot water supply exhaust passage of the bath water heater and the heating exhaust passage of the hot water heater, and an exhaust cylinder opened on the upper surface of the mixed exhaust passage is provided. One end in the longitudinal direction of the passage communicates with a substantially U-shaped folded passage of the hot water supply exhaust passage, and the other end communicates with a substantially U-shaped folded passage of the heating exhaust passage. Detects situations where smoke is likely to occur The white smoke detection means is provided to increase the air volume from the air supply fan during detection by the white smoke detection means, so that white smoke may be generated, especially in cold areas where white smoke is likely to occur. Is increased, the white smoke detection means detects the situation where white smoke from the combustion exhaust gas is likely to be generated and increases the air volume from the air supply fan, so that the combustion exhaust gas is diluted and the air ratio is increased. The generation of white smoke can be suppressed while the latent heat of the combustion exhaust gas is recovered to improve efficiency.
[0025]
According to a fourth aspect of the present invention, there is provided a gas burner installed in the combustion chamber, an air supply fan for supplying air to the gas burner, a primary heat exchanger for raising the temperature of water by the heat of the gas burner, and a combustion chamber. A plurality of latent heat recovery type heat source devices , each of which has a plurality of latent heat recovery type heat source devices , each of which includes an exhaust passage that discharges the combustion exhaust gas to the outside and a secondary heat exchanger that recovers latent heat of the combustion exhaust gas in the exhaust passage. The hot water supply / exhaust passage of the bath water heater and the heating / exhaust passage of the hot water heater are configured separately, and one end in the longitudinal direction of the hot water supply / exhaust passage communicates with the substantially U-shaped folded passage and the length of the heating / exhaust passage One end of the direction communicates with a substantially U-shaped folded passage, and the outlets of both the exhaust passages are arranged to face the exhaust outlets of the equipment casings of the bath water heater and the hot water heater, respectively, and face the exhaust outlet. dilution of one of the external Te By installing a fan, since the to supply dilution air toward the outlet side of both the exhaust passage, well with only the combustion exhaust gas directing wind direction of the dilution fan on the outlet side of the exhaust passage and the dilution air is mixed As a result, the dew point temperature of the combustion exhaust gas can be lowered. Therefore, the generation of white smoke can be suppressed while the latent heat of the combustion exhaust gas is recovered to improve the efficiency. Furthermore, compared with the case where the rotation speed of the air supply fan is increased to increase the air volume, it is only necessary to install a dilution fan, so that a white smoke prevention effect can be obtained with a simple structure.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram showing an example of an embodiment of the present invention.
FIG. 2 is a schematic configuration diagram showing another embodiment.
FIG. 3 is an explanatory view when a dilution fan is externally attached to the equipment casing.
FIG. 4 is a schematic configuration diagram showing still another embodiment.
FIG. 5 is a block diagram of the above.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Latent heat recovery type heat source machine 2 Mixing exhaust passage 3, 3a Air supply fan 4, 4a Combustion chamber 5, 5a Gas burner 6, 6a Primary heat exchanger 7, 7a Secondary heat exchanger 10, 10a Exhaust passage 19 Dilution fan 21 White smoke detection means

Claims

A gas burner installed in the combustion chamber, an air supply fan that supplies air to the gas burner, a primary heat exchanger that raises the temperature of water by the heat of the gas burner, and an exhaust that discharges combustion exhaust gas from the combustion chamber to the outside Hot water supply exhaust of a bath water heater comprising a plurality of latent heat recovery type heat source devices comprising a passage and a secondary heat exchanger for recovering latent heat of combustion exhaust gas in the exhaust passage, and constituting the plurality of latent heat recovery type heat source devices The passage and the heating / exhaust passage of the hot water heater are each provided with a single mixed exhaust passage, and an exhaust pipe opened on the upper surface of the mixed exhaust passage is provided. A white smoke prevention structure for a latent heat recovery type heat source device, characterized in that it communicates with a substantially U-shaped folded passage of the passage and the other end communicates with a substantially U-shaped folded passage of the heating exhaust passage .

The air supply fan of the other latent heat recovery type heat source unit on the non-combustion side is rotated at the time of single combustion of any one of the plurality of latent heat recovery type heat source units. The white smoke prevention structure of a latent heat recovery type heat source machine according to claim 1.

A gas burner installed in the combustion chamber, an air supply fan that supplies air to the gas burner, a primary heat exchanger that raises the temperature of water by the heat of the gas burner, and an exhaust that discharges combustion exhaust gas from the combustion chamber to the outside Hot water supply exhaust of a bath water heater comprising a plurality of latent heat recovery type heat source devices comprising a passage and a secondary heat exchanger for recovering latent heat of combustion exhaust gas in the exhaust passage, and constituting the plurality of latent heat recovery type heat source devices The passage and the heating / exhaust passage of the hot water heater are each provided with a single mixed exhaust passage, and an exhaust pipe opened on the upper surface of the mixed exhaust passage is provided. The other end communicates with the substantially U-shaped folded passage of the passage, and the other end communicates with the substantially U-shaped folded passage of the heating / exhaust passage to detect a situation in which white smoke of the combustion exhaust gas is likely to be generated. White smoke detection means for , White smoke prevention structure latent heat recovery type heat source machine, characterized in that to increase the air volume from the air supply fan at detection by white smoke detecting means.

A gas burner installed in the combustion chamber, an air supply fan that supplies air to the gas burner, a primary heat exchanger that raises the temperature of water by the heat of the gas burner, and an exhaust that discharges combustion exhaust gas from the combustion chamber to the outside Hot water supply exhaust of a bath water heater comprising a plurality of latent heat recovery type heat source devices comprising a passage and a secondary heat exchanger for recovering latent heat of combustion exhaust gas in the exhaust passage, and constituting the plurality of latent heat recovery type heat source devices The passage and the heating / exhaust passage of the hot water heater are separated, and one end in the longitudinal direction of the hot water supply / exhaust passage communicates with the substantially U-shaped folded passage, and one end in the longitudinal direction of the heating / exhaust passage is substantially U-shaped. It communicates with the return passage, and the outlets of both exhaust passages are arranged facing the exhaust outlets of the equipment casings of the bath water heater and hot water heater, respectively, and one external dilution fan faces the exhaust outlet. the installed, both the exhaust White smoke prevention structure of latent heat recovery type heat source machine is characterized in that so as to supply dilution air toward the outlet side of the road.