JP3829437B2

JP3829437B2 - Hot water heater

Info

Publication number: JP3829437B2
Application number: JP28171197A
Authority: JP
Inventors: 正山▲ざき▼; 真也中川; 健吉橋戸; 村上　　茂
Original assignee: Panasonic Corp; Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Corp; Panasonic Holdings Corp
Priority date: 1997-10-15
Filing date: 1997-10-15
Publication date: 2006-10-04
Anticipated expiration: 2017-10-15
Also published as: JPH11118171A

Description

【０００１】
【発明の属する技術分野】
本発明は温水を用いて暖房を行う温水暖房装置の温水熱交換器に関するものである。
【０００２】
【従来の技術】
従来灯油などの液体燃料を燃焼してその燃焼ガスを排出する過程で熱交換して高温の温水を確保するという温水暖房装置には、図３に示すように燃焼ガスを排出する経路の周囲に温水を貯めるウォータージャケット１を形成し、直接温水を加熱するというタイプと、図４に示すように燃焼ガスを排出する経路を形成する熱交換器２を設け、その熱交換器の外周面に温水を熱交換するための温水熱交換器３を取り付け、間接的に温水を加熱するというタイプに大別される。前者は比較的能力の大きい業務用などに用いられ、バーナ構造なども堅牢な構成がとられており、バーナ部の耐熱性も材料、構造面で十分配慮した設計がなされていた。後者は比較的能力の小さい家庭用の暖房などに用いられ、運転開始後の暖房の立ち上がりの早さを重視した瞬間加熱タイプの構成にしたものが多く、前記温水熱交換器の構成として燃焼ガスを排出する経路を形成する熱交換器２の外周面に略円形状のパイプ３を螺旋状に巻き付けるというものであった。また、灯油などの液体燃料を燃焼するバーナ部４は燃料を気化し、その気化ガスを噴出して火炎を形成する炎口部と、この炎口部５で完全燃焼できない不完全燃焼ガスを前記炎口部５の下流に設けた二次空気孔６より導入される二次空気と混合して完全燃焼させるための燃焼室７で構成されている。そして、このバーナ部の下流に前記熱交換器２を配設するという構成になっており、温水熱交換器とバーナ部は直接関連をもった構成とはなっていないものであった。例えば特開平８−４２９４２のように温水熱交換器は熱交換器の外周面に巻き付けた構成とし、バーナ部とは直接に関連をもたせた構成とはしていないものである。
【０００３】
【発明が解決しようとする課題】
しかしながら、このような従来の構成で、特に燃焼ガスを排出する経路を形成する熱交換器を設け、その熱交換器の外周面に温水を熱交換するための温水熱交換器を取り付け、間接的に温水を加熱するというタイプにおいては、温水熱交換器は燃焼ガスを熱交換する熱交換器の外周面にのみ巻き付けた構成とし、バーナ部とは直接関連をもたせた構成としていないため、バーナ部、特に燃焼室近傍は燃焼熱で高温に加熱される状態となり、燃焼室を形成する材料は耐熱性を有するものが必要となり、かつこの燃焼室部分より放熱する熱量も大なるものとなり、大量の熱損失を発生するとともに近年のように機器本体をコンパクトな構成にするものにあってはこの燃焼室部分より発生する輻射熱が他の構成部品に影響を与えるという課題もあった。
【０００４】
本発明は上記従来の課題を解決するため、気化された燃料を燃焼用空気と混合して燃焼させる炎口部と、この炎口部で発生する燃焼ガスを内壁に設けた複数の凸部間の間隙を通して熱交換するための熱交換器と、前記炎口部で発生する燃焼ガスを完全燃焼させる空間を有すると共に前記熱交換器に燃焼ガスを導く燃焼筒と、前記熱交換器を介して温水を加熱する温水熱交換器を備え、前記燃焼筒の外周面に前記熱交換器の外周面と略同一面となる部分を設け、前記温水熱交換器は前記熱交換器の外周面と略同一面を有する燃焼筒の外周面から巻き始め隣同士を接触させながら前記熱交換器の外周面の略全体に温水を加熱するための熱交パイプを巻き付けた構成としている。
【０００５】
上記発明によれば、燃焼筒の外周面にも熱交換パイプを巻き付けた構成としているため、燃焼熱で高温に加熱された燃焼室を形成する燃焼筒は温水の循環により冷却されることになり燃焼筒温度を大幅に低下させることができ、燃焼筒材料の耐熱性を向上し、輻射熱による他の構成部品への影響も軽減することができる。また同時に、この高温の燃焼筒部分で温水の熱交換も行うため熱交換効率も向上させることができるものである。
【０００６】
【発明の実施の形態】
本発明の請求項１の発明は、気化された燃料を燃焼用空気と混合して燃焼させる炎口部と、この炎口部で発生する燃焼ガスを内壁に設けた複数の凸部間の間隙を通して熱交換するための熱交換器と、前記炎口部で発生する燃焼ガスを完全燃焼させる空間を有すると共に前記熱交換器に燃焼ガスを導く燃焼筒と、前記熱交換器を介して温水を加熱する温水熱交換器を備え、前記燃焼筒の外周面に前記熱交換器の外周面と略同一面となる部分を設け、前記温水熱交換器は前記熱交換器の外周面と略同一面を有する燃焼筒の外周面から巻き始め隣同士を接触させながら前記熱交換器の外周面の略全体に温水を加熱するための熱交パイプを巻き付けた構成としている。
【０００７】
そして、燃焼筒の外周面にも熱交換パイプを巻き付けた構成としているため、燃焼熱で高温に加熱された燃焼室を形成する燃焼筒は温水の循環により冷却されることになり燃焼筒温度を大幅に低下させることができ、燃焼筒材料の耐熱性を向上し、輻射熱による他の構成部品への影響も軽減することができる。また同時に、この高温の燃焼筒部分で温水の熱交換も行うため熱交換効率も向上させることができるものである。
【０００８】
また、請求項２の発明は、燃料を供給するポンプと、燃焼用空気を供給する送風ファンを取り付け軸先端部には前記燃料を回転霧化するフリキリファンを取り付けたバーナモータと、前記霧化された燃料を気化するヒータを内蔵した気化筒と、この気化筒の上部に載置し前記気化ガスを噴出する炎口部と、この炎口部の周囲を覆い上部周壁に二次空気を供給する複数の孔を有する燃焼リングと、この燃焼リングの周囲を覆い前記炎口部で形成する燃焼炎の不完全燃焼ガスを前記二次空気と混合して完全燃焼させる燃焼筒と、この燃焼筒の上部に載置し内壁に複数の凸部を有する熱交換器と、この熱交換器の内通部に設け前記燃焼筒より導かれた燃焼ガスを前記熱交換器の内壁凸部間の間隙に流す有底筒状の抵抗筒を備え、前記燃焼筒の外周面に前記熱交換器の外周面と略同一面となる部分を設け、この熱交換器の外周面と略同一面を有する燃焼筒の外周面から巻き始め隣同士を接触させながら前記熱交換器の外周面の略全体に温水を熱交換するための熱交換パイプを巻き付けた構成としている。
【０００９】
そして、燃焼筒内に形成される燃焼室で二次空気による完全燃焼化と、抵抗板によって熱交換器に沿う燃焼ガスの流れをつくり熱交換効率を高めることができる。さらに、燃焼室を形成し燃焼炎が接触する燃焼筒の外周面にも熱交換パイプを巻き付けた構成として燃焼熱で高温に加熱された燃焼筒を温水の循環により冷却し、燃焼筒温度を大幅に低下させることで、燃焼筒材料の耐熱性を向上し、輻射熱による他の構成部品への影響も軽減するようにしている。また同時に、この高温に加熱された燃焼筒部分で温水の熱交換も行うことになるため熱交換効率が向上すると共に温水の立ち上がり特性も大幅に改善されることになる。
【００１０】
また、請求項３の発明は、燃焼筒の先端部を略垂直方向に起立させ、その内径を抵抗筒外径より小さくし、熱交換器の内通部に挿入するように構成している。
【００１１】
そして、燃焼炎が熱交換器下端部に直接接触するのを防止して熱交換器の耐熱性を確保すると共に燃焼ガスの流速を抑制し蛇行して流出させることで熱交換器内壁面に略均一に設けた複数の凸部間を燃焼ガスが均一に流れるようにしている。また、先端部を略垂直方向に起立させ、その内径を抵抗筒外径より小さくすることで、熱交換器下流からのゴミや燃焼残留物がバーナ部に落下するのを防止するようにして長寿命化を図っている。
【００１２】
また、請求項４の発明は、抵抗筒は円筒形状とし、その下端および略中央部に遮蔽板を配設するように構成している。
【００１３】
そして、抵抗筒下端部に設けた遮蔽板により熱交換器の内通部中央に集中する燃焼ガスを遮蔽し、熱交換器内壁面に略均一に設けた複数の凸部間を均一に流れるようして熱交換効率を向上するとともに略中央部に遮蔽板を設けることで、抵抗筒上端部に所定容積の空間部を確保し、バーナ部で発生する燃焼音を吸収するようにしている。
【００１４】
また、請求項５の発明は、熱交換パイプは燃焼筒外周面の巻き始め部と熱交換器外周面の巻き終わり部に熱交パイプと同材料の取付金具をロー付けし、前記巻き始め部に設けた取付金具は燃焼筒に取り付け、前記巻き終わり部に設けた取付金具は熱交換器に取り付け、隣接する熱交換パイプ間をロー付けして固定するように構成している。
【００１５】
そして、熱交換パイプの巻き始めおよび巻き終わり部を確実に支持し、かつ隣接する熱交換パイプ間を固定することで熱ストレスや圧力印加時における収縮音や振動音を防止するようにしている。
【００１６】
また、請求項６の発明は、熱交パイプは円形状のパイプを楕円形状など扁平形状に変形させながら燃焼筒および熱交換器外周面に巻き付けるようにしている。
【００１７】
そして、楕円形状などの扁平形状にすることで熱交換器や燃焼筒との接触面積を増大させ、熱交換効率を向上させるとともに円形状のパイプを変形させながら巻き付けることで低コスト化を図るようにしている。
【００１８】
また、請求項７の発明は、熱交換パイプは燃焼筒巻き付け側を温水の入口、熱交換器巻き付け側を出口とし、出口側の熱交換パイプ外周面に接するように同材料の板状の金具をロー付けし、前記金具表面に温度検出器と加熱防止装置を取り付けるように構成している。
【００１９】
そして、高温に加熱された燃焼筒外周面に巻き付けた熱交換パイプ側を温水の入口とすることで、効率的に温水の熱交換を行うとともに温水の立ち上がりを早くして使い勝手を著しく向上するものである。また、熱交換器下流側表面に巻き付けた熱交換パイプ表面に金具を介して温度検出器と過熱防止装置を取り付けることで、安定した温水温度の検出が可能となり、最適な温水温度の制御ができる。
【００２０】
また、請求項８の発明は、熱交換パイプは燃焼筒巻き付け側を温水の入口、熱交換器巻き付け側を出口とし、出口側は温水パイプを介して温水継ぎ手の温水往き側に接続し直接放熱機に搬送するようにし、入口側は温水戻り側からの温水を温水タンクおよび温水循環手段を経由して供給するように構成している。
【００２１】
そして、熱交換パイプの出口から直接放熱機に温水を搬送するように構成することで放熱機からの温風の吹き出しを早めることができ、使い勝手が著しく向上するものである。また、温水戻り側に温水タンクと温水循環手段を配設することで、温水による熱ストレスを受けることなく耐熱性を低減することができ、コストの低減も図れるものである。
【００２２】
【実施例】
以下本発明の実施例について図面に基づき説明する。
【００２３】
（実施例１）
まず、図１、図２を用いて本発明の実施例１の温水暖房装置の構成を説明する。２１は燃料を供給するポンプで送油管２２により気化部に導かれている。２３は送風モータでそのモータ軸に燃焼用空気を供給するファン２４と先端部に前記送油管２４より供給される燃料を回転霧化するフリキリファン２５が取り付けられている。２６は気化筒でヒータを埋設し所定の温度に加熱することで前記霧化された燃料を気化し、燃焼用空気と混合して上部に配設した炎口部２７より噴出する。噴出された気化ガスは点火装置による点火動作で点火され燃焼が開始する。２８は燃焼リングで燃焼炎を形成する炎口部２７の周囲を覆い、その上部の周囲に二次空気を導入するための複数の空気孔２８ａが設けられている。２９は燃焼筒で前記二次空気孔２８ａより供給される二次空気と前記炎口部２７で完全燃焼できなかった不完全燃焼ガスを混合して完全燃焼させる部分である。２９ａは、燃焼筒先端部で略垂直方向に起立させ、熱交換器３０の内通部に挿入している。３０は熱交換器で前記燃焼筒２９の上部に配設され、内壁面に複数の凸部を有する構造とし、この内壁面の凸部間の間隙を燃焼ガスが通過することにより熱交換するようになっている。３１は抵抗筒で前記熱交換器３０の内通部の適所に配設され、その下端部と略中央部に燃焼ガスの通過を遮蔽するための遮蔽板３１ａ、３１ｂを設けており、下端部の遮蔽板３１ａで燃焼ガスの排気抵抗を形成し、バーナ部よりの燃焼ガスの流速を抑制して熱交換器３０の内壁面に設けた凸部間の間隙に均一に燃焼ガスを通過させるようにしている。略中央部に設けた遮蔽板３１ｂは抵抗筒３１の上部に所定の容積を有する空間部３１ｃを確保して、バーナ部で発生する燃焼音を低減するための消音部を形成している。３２は熱交換パイプで前記燃焼筒２９の外周面を巻き始めとして、この外周面と略同一面上に設けられた熱交換器３０の外周面全体に巻き付けるようにして温水の熱交換を行うようにしている。３３は温度検出器取付金具で前記熱交換パイプ３２の巻き終わり部の外周面にロー付けなどで取り付け、その表面に温度検出器３４と過熱防止装置３５を取り付けるようにしている。また、前記熱交換パイプ３２は燃焼筒２９と熱交換器３０の外周面に巻き付けるときに強制的に楕円形状などの扁平形状として前記外周面との接触面積を増大するようにしている。３６は温水継ぎ手で温水往き側３６ａと温水戻り側３６ｂよりなり、温水往き側３６ａは前記熱交換パイプ３２の出口に温水パイプ３７を介して直接接続されており、熱交換された温水を直接室内に設置された放熱機（図示なし）に搬送するようにしている。また、温水戻り側３６ｂは温水タンク３８および温水循環手段３９を経由して、熱交換パイプ３２の入口側に接続するようにしている。
【００２４】
なお、図中の黒抜き矢印は燃焼排気ガスの流れを白抜き矢印は温水の流れを示す。
【００２５】
次に、上記のように構成された温水暖房装置の動作について説明する。
運転信号が入力されると制御部（図示なし）より予め設定したシーケンスに基づき各負荷に動作信号が送られる。まず、気化筒２６に埋設したヒータ（図示なし）に通電され気化筒２６が所定の温度に加熱される。所定温度に達すると送風モータ２３と燃料ポンプ２１により燃焼用空気と燃料が供給される。供給された燃料は送風モータ２３の先端部に取り付けたフリキリファン２５により回転霧化され気化筒２６の内壁に吹き付けられる。ここで燃料は気化され燃焼用空気である一次空気と混合されて、気化筒２６上部に配設された複数の炎口を有する炎口部２７より噴出する。噴出した気化ガスは点火動作により点火され、炎口部２７近傍で火炎を形成して燃焼を開始する。また、この炎口部２７近傍における燃焼は気化筒２６の中央部より供給される一次空気との混合比で定まるが、本願発明のように強制的に燃焼用空気を供給するタイプのバーナにおいては一次空気のみで完全燃焼を行わせることは困難であり、このため炎口部２７より上方に二次空気取り入れ用の孔２８ａを設け、二次空気を導入して燃焼筒２９部分で完全燃焼を行わせるようにしている。このため、バーナ構成上、燃焼筒２９の内部が燃焼必要空間となり、この燃焼筒２９は高温に加熱されている。他の構成部品への熱的影響を防止するような構造も必要であった。そこで本願発明は、この燃焼筒２９の外周面にも熱交換パイプ３２を巻き付けることにより、熱交換器３２の一部を形成する構成として、形状面および熱的影響を軽減するようにしている。
【００２６】
そして、燃焼筒２９で発生した燃焼ガスは燃焼筒先端部２９ａが絞られているため、この部分で流速が低下し、蛇行して熱交換器３０の内通部に入る。熱交換器３０の内通部には適所に抵抗筒３１が配設されており、その下端部には燃焼ガスの通過を遮るごとく遮蔽板３１ａが設けられているため、燃焼ガスは熱交換器３０の内壁に設けられた凸部間の間隙を通過して排気筒４０より排出される。
【００２７】
また、前記抵抗筒３１の略中央部には遮蔽板３１ｂが設けられており、抵抗筒３１の上部に所定の容積を有する空間部３１ｃを設け、燃焼ガス排気経路の途中に拡大部を備えた構成とすることで、消音効果を持たせ燃焼音の低減を図ると共にバーナ部で振動燃焼が発生するような条件になった場合、この排気経路に設けた拡大部により抑制するようにしている。また、前記燃焼筒先端部２９ａは略垂直方向に起立させ、その内径ｄ１を抵抗筒３１の外径ｄ２より小さくしているため熱交換器３０の内壁面などに付着するスケールはこの起立部に堆積し燃焼部に落下しないためバーナの長寿命化が図れることになる。
【００２８】
以上のような燃焼動作において、燃焼筒２９と熱交換器３０の外周面に巻き付けた熱交換パイプ３２内に温水を循環することにより高温の温水を確保し、熱交換パイプ３２の出口より温水往き側継ぎ手３６ａを介して、室内に設置してある放熱機に温水を搬送することで、立ち上がりの早い温水暖房装置を提供するようにしている。また、高温に加熱された燃焼筒２９の外周面を熱交換パイプ３２の巻き始めとすることで、温水の立ち上がりを早めるとともに燃焼筒２９の冷却効果を大きなものとしている。さらに、前記熱交換パイプ３２は巻き始め部および巻き終わり部の適所に同材質の取付金具をロー付けして燃焼筒２９と熱交換器３０に固定するとともに隣接する熱交換器パイプ３２間をロー付けして固定することで強度の確保と熱衝撃による収縮音や圧力印加時における振動音を抑制するようにしている。
【００２９】
【発明の効果】
以上説明したように請求項１の発明によれば、燃焼室を形成し燃焼炎が接触する燃焼筒の外周面にも熱交換パイプを巻き付けた構成として燃焼熱で高温に加熱された燃焼筒を温水の循環により冷却し、燃焼筒温度を大幅に低下させることで、燃焼筒材料の耐熱性を向上し、輻射熱による他の構成部品への影響も軽減するようにしている。また同時に、この高温に加熱された燃焼筒部分で温水の熱交換も行うことになるため熱交換効率が向上すると共に温水の立ち上がり特性も大幅に改善することができる。
【００３０】
また、請求項２の発明によれば、そして燃焼筒内に形成される燃焼室で二次空気による完全燃焼化と、抵抗板によって熱交換器に沿う燃焼ガスの流れをつくり熱交換率を高めることができる。さらに燃焼室を形成し燃焼炎が接触する燃焼筒の外周面にも熱交換パイプを巻き付けた構成として燃焼熱で高温に加熱された燃焼筒を温水の循環により冷却し、燃焼筒温度を大幅に低下させることで、燃焼筒材料の耐熱性を向上し、輻射熱による他の構成部品への影響も軽減するようにしている。また同時に、この高温に加熱された燃焼筒部分で温水の熱交換も行うことになるため熱交換効率が向上すると共に温水の立ち上がり特性も大幅に改善されることになる。
【００３１】
また、請求項３の発明によれば、燃焼炎が熱交換器下端部に直接接触するのを防止して熱交換器の耐熱性を確保すると共に燃焼ガスの流速を抑制し蛇行して流出させることで熱交換器内壁面に略均一に設けた複数の凸部間を燃焼ガスが均一に流れるようになる。また、先端部を略垂直方向に起立させ、その内径を抵抗筒外径より小さくすることで、熱交換器下流からのゴミや燃焼残留物がバーナ部に落下するのを防止することができ長寿命化を図ることができる。
【００３２】
また、請求項４の発明によれば、抵抗筒下端部に設けた遮蔽板により熱交換器の内通部中央に集中する燃焼ガスを遮蔽し、熱交換器内壁面に略均一に設けた複数の凸部間を均一に流れるようして熱交換効率を向上するとともに略中央部に遮蔽板を設けることで、抵抗筒上端部に所定容積の空間部を確保し、バーナ部で発生する燃焼音を吸収することができる。
【００３３】
また、請求項５の発明によれば、熱交換パイプの巻き始めおよび巻き終わり部を確実に支持し、かつ隣接する熱交換パイプ間を固定することで熱ストレスや圧力印加時における収縮音や振動音を防止することができる。
【００３４】
また、請求項６の発明によれば、楕円形状などの扁平形状にすることで熱交換器や燃焼筒との接触面積を増大させ、熱交換効率を向上させるとともに円形状のパイプを変形させながら巻き付けることで低コスト化を図ることができる。
【００３５】
また、請求項７の発明によれば、高温に加熱された燃焼筒外周面に巻き付けた熱交換パイプ側を温水の入口とすることで、効率的に温水の熱交換を行うとともに温水の立ち上がりを早くして使い勝手を著しく向上するものである。また、熱交換器下流側表面に巻き付けた熱交換パイプ表面に金具を介して温度検出器と過熱防止装置を取り付けることで、安定した温水温度の検出が可能となり、最適な温水温度の制御ができる。
【００３６】
また、請求項８の発明によれば、熱交換パイプの出口から直接放熱機に温水を搬送するように構成することで放熱機からの温風の吹き出しを早めることができ、使い勝手が著しく向上するものである。また、温水戻り側に温水タンクと温水循環手段を配設することで、温水による熱ストレスを受けることなく耐熱性を低減することができ、コストの低減も図れるものである。
【図面の簡単な説明】
【図１】本発明の実施例１の温水暖房装置の構成図
【図２】同温水暖房装置の熱交換パイプ部の構成図
【図３】従来の温水暖房装置の構成図
【図４】従来の温水暖房装置の構成図
【符号の説明】
２１ポンプ
２３バーナモータ
２４送風ファン
２５フリキリファン
２６気化筒
２７炎口部
２８燃焼リング
２９燃焼筒
３０熱交換器
３１抵抗筒
３２熱交換パイプ
３４温度検出器
３５加熱防止装置
３６温水継ぎ手
３８温水タンク
３９温水循環手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water heat exchanger of a hot water heating apparatus that performs heating using hot water.
[0002]
[Prior art]
Conventionally, a hot water heating apparatus that secures high-temperature hot water by exchanging heat in the process of burning liquid fuel such as kerosene and discharging the combustion gas, as shown in FIG. 3, around the path for discharging the combustion gas. A water jacket 1 for storing warm water is formed, and a type in which warm water is directly heated and a heat exchanger 2 that forms a path for discharging combustion gas as shown in FIG. 4 are provided, and hot water is provided on the outer peripheral surface of the heat exchanger. A hot water heat exchanger 3 for exchanging heat is attached and the hot water is indirectly heated. The former is used for business purposes with relatively high capacity, and the burner structure and the like have a robust structure, and the heat resistance of the burner part has been designed with sufficient consideration in terms of material and structure. The latter is used for household heating, etc., which has a relatively small capacity, and is often configured as an instantaneous heating type that places importance on the rapid start-up of heating after the start of operation, and the hot water heat exchanger is configured as a combustion gas. The substantially circular pipe 3 is spirally wound around the outer peripheral surface of the heat exchanger 2 that forms a path for discharging the heat. Also, the burner section 4 for burning liquid fuel such as kerosene vaporizes the fuel and emits the vaporized gas to form a flame, and the incomplete combustion gas that cannot be completely combusted by the flame opening section 5. It is composed of a combustion chamber 7 for mixing with secondary air introduced from a secondary air hole 6 provided downstream of the flame opening 5 and causing complete combustion. The heat exchanger 2 is arranged downstream of the burner portion, and the hot water heat exchanger and the burner portion are not directly related to each other. For example, as disclosed in JP-A-8-42942, the hot water heat exchanger is wound around the outer peripheral surface of the heat exchanger, and is not directly related to the burner portion.
[0003]
[Problems to be solved by the invention]
However, with such a conventional configuration, in particular, a heat exchanger that forms a path for discharging combustion gas is provided, and a hot water heat exchanger for exchanging hot water is attached to the outer peripheral surface of the heat exchanger, and indirectly In the type in which hot water is heated, the hot water heat exchanger is wound only on the outer peripheral surface of the heat exchanger that exchanges heat with the combustion gas, and is not directly related to the burner portion. In particular, the vicinity of the combustion chamber is heated to a high temperature by the combustion heat, and the material forming the combustion chamber needs to have heat resistance, and the amount of heat dissipated from the combustion chamber portion also increases, resulting in a large amount of heat. In the case of equipment that generates heat loss and has a compact body as in recent years, there is also a problem that the radiant heat generated from the combustion chamber part affects other components. .
[0004]
In order to solve the above-described conventional problems, the present invention provides a flame opening portion that burns vaporized fuel with combustion air, and a plurality of projections provided on the inner wall with combustion gas generated at the flame opening portion. A heat exchanger for exchanging heat through the gap , a combustion cylinder having a space for completely combusting the combustion gas generated at the flame port and guiding the combustion gas to the heat exchanger, and via the heat exchanger A hot water heat exchanger for heating hot water is provided, and a portion that is substantially flush with the outer peripheral surface of the heat exchanger is provided on the outer peripheral surface of the combustion cylinder , and the hot water heat exchanger is substantially the same as the outer peripheral surface of the heat exchanger. A heat exchange pipe for heating the hot water is wound around substantially the entire outer peripheral surface of the heat exchanger while starting to wind from the outer peripheral surface of the combustion cylinder having the same surface and bringing the adjacent members into contact with each other.
[0005]
According to the above invention, since the heat exchange pipe is wound around the outer peripheral surface of the combustion cylinder, the combustion cylinder forming the combustion chamber heated to high temperature by the combustion heat is cooled by circulation of hot water. The temperature of the combustion cylinder can be greatly reduced, the heat resistance of the combustion cylinder material can be improved, and the influence on other components due to radiant heat can also be reduced. At the same time, the heat exchange efficiency can be improved because the hot water is also exchanged in the high-temperature combustion cylinder portion.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
According to a first aspect of the present invention, there is provided a gap between a flame port portion for mixing vaporized fuel with combustion air and burning, and a plurality of projections provided on the inner wall with combustion gas generated in the flame port portion. A heat exchanger for exchanging heat through, a space for completely combusting the combustion gas generated at the flame port, and a combustion cylinder for guiding the combustion gas to the heat exchanger, and hot water via the heat exchanger A hot water heat exchanger for heating is provided, a portion that is substantially flush with the outer circumferential surface of the heat exchanger is provided on the outer circumferential surface of the combustion cylinder, and the hot water heat exchanger is substantially flush with the outer circumferential surface of the heat exchanger. A heat exchange pipe for heating hot water is wound around substantially the entire outer peripheral surface of the heat exchanger while starting to wind from the outer peripheral surface of the combustion cylinder having contact with each other .
[0007]
Since the heat exchange pipe is also wound around the outer peripheral surface of the combustion cylinder, the combustion cylinder forming the combustion chamber heated to high temperature by the combustion heat is cooled by the circulation of hot water, and the combustion cylinder temperature is reduced. The heat resistance of the combustion cylinder material can be improved, and the influence on other components due to radiant heat can be reduced. At the same time, the heat exchange efficiency can be improved because the hot water is also exchanged in the high-temperature combustion cylinder portion.
[0008]
According to a second aspect of the present invention, there is provided a fuel supply pump, a blower fan for supplying combustion air, a burner motor having a fluffy fan for rotating and atomizing the fuel at a shaft tip, and the atomized fuel. A vaporizing cylinder with a built-in heater for vaporizing the fuel, a flame port part which is placed on the vaporization cylinder and ejects the vaporized gas, covers the periphery of the flame port part and supplies secondary air to the upper peripheral wall A combustion ring having a plurality of holes, a combustion cylinder that covers the periphery of the combustion ring and that completely burns the incomplete combustion gas of the combustion flame formed at the flame port by mixing with the secondary air, A heat exchanger placed on the top and having a plurality of convex portions on the inner wall, and the combustion gas provided in the inner passage portion of the heat exchanger and guided from the combustion cylinder in the gap between the inner wall convex portions of the heat exchanger It includes a bottomed cylindrical resistance tube flow, the outer peripheral surface of the combustion liner A portion that is substantially flush with the outer circumferential surface of the heat exchanger is provided, and the outer circumference of the heat exchanger is brought into contact with each other starting from the outer circumferential surface of the combustion cylinder having the substantially same surface as the outer circumferential surface of the heat exchanger. It is set as the structure which wound the heat exchange pipe for heat-exchanging warm water to the substantially whole surface .
[0009]
The combustion chamber formed in the combustion cylinder can be completely combusted by secondary air, and the resistance plate can create a flow of combustion gas along the heat exchanger, thereby increasing the heat exchange efficiency. In addition, a heat exchange pipe is also wound around the outer peripheral surface of the combustion cylinder that forms the combustion chamber and contacts the combustion flame. The combustion cylinder heated to high temperature with the combustion heat is cooled by circulating hot water, greatly increasing the combustion cylinder temperature. Thus, the heat resistance of the combustion cylinder material is improved, and the influence on other components due to radiant heat is also reduced. At the same time, heat exchange of the hot water is performed in the combustion cylinder portion heated to this high temperature, so that the heat exchange efficiency is improved and the rising characteristics of the hot water are greatly improved.
[0010]
According to a third aspect of the present invention, the tip end portion of the combustion cylinder is erected in a substantially vertical direction, and the inner diameter thereof is made smaller than the outer diameter of the resistance cylinder and is inserted into the inner passage portion of the heat exchanger.
[0011]
The combustion flame is prevented from coming into direct contact with the lower end of the heat exchanger to ensure the heat resistance of the heat exchanger, and the flow rate of the combustion gas is suppressed to meander to flow out to the inner wall surface of the heat exchanger. The combustion gas is made to flow uniformly between a plurality of uniformly provided convex portions. In addition, the tip portion is erected in a substantially vertical direction, and its inner diameter is made smaller than the outer diameter of the resistance cylinder, thereby preventing the dust and combustion residues from downstream of the heat exchanger from falling on the burner portion. We are trying to extend the service life.
[0012]
According to a fourth aspect of the present invention, the resistance cylinder is formed in a cylindrical shape, and a shielding plate is disposed at the lower end and substantially the center thereof.
[0013]
Then, the shielding gas provided at the lower end portion of the resistance cylinder shields the combustion gas concentrated at the center of the internal portion of the heat exchanger so that it flows uniformly between the plurality of convex portions provided substantially uniformly on the inner wall surface of the heat exchanger. In addition, the heat exchange efficiency is improved and a shielding plate is provided in the substantially central portion, so that a space portion having a predetermined volume is secured at the upper end portion of the resistance cylinder, and combustion noise generated in the burner portion is absorbed.
[0014]
According to the invention of claim 5, the heat exchange pipe is brazed with a fitting made of the same material as the heat exchange pipe at the winding start portion of the outer peripheral surface of the combustion cylinder and the winding end portion of the outer peripheral surface of the heat exchanger. The mounting bracket provided at the end of the winding is attached to the combustion cylinder, the mounting bracket provided at the end of the winding is attached to the heat exchanger, and the adjacent heat exchange pipes are brazed and fixed.
[0015]
And the shrinkage | contraction sound and vibration sound at the time of heat stress and pressure application are prevented by reliably supporting the winding start and winding end part of a heat exchange pipe, and fixing between adjacent heat exchange pipes.
[0016]
According to a sixth aspect of the present invention, the heat exchange pipe is wound around the outer peripheral surface of the combustion cylinder and the heat exchanger while the circular pipe is deformed into a flat shape such as an elliptical shape.
[0017]
And, by making the flat shape such as an elliptical shape, the contact area with the heat exchanger and the combustion cylinder is increased, the heat exchange efficiency is improved, and the cost is reduced by winding the circular pipe while deforming it. I have to.
[0018]
According to a seventh aspect of the present invention, the heat exchange pipe has a plate-shaped metal fitting made of the same material so as to contact the outer peripheral surface of the heat exchange pipe on the outlet side, with the combustion tube winding side as the hot water inlet and the heat exchanger winding side as the outlet. And a temperature detector and a heating prevention device are attached to the surface of the metal fitting.
[0019]
And by using the heat exchange pipe wound around the outer peripheral surface of the combustion cylinder heated to a high temperature as the inlet of hot water, the heat exchange of the hot water is efficiently performed and the rise of the hot water is quickened so that the usability is remarkably improved. It is. In addition, by attaching a temperature detector and an overheat prevention device to the heat exchange pipe surface wound around the downstream surface of the heat exchanger via metal fittings, it becomes possible to detect stable hot water temperature and control the optimal hot water temperature. .
[0020]
In the invention according to claim 8, the heat exchange pipe has the combustion tube winding side as the hot water inlet and the heat exchanger winding side as the outlet, and the outlet side is connected to the hot water outlet side of the hot water joint via the hot water pipe and directly radiates heat. The hot water from the hot water return side is supplied via the hot water tank and the hot water circulation means on the inlet side.
[0021]
And it is possible to expedite the warm air blown from the heat radiator by conveying the hot water directly from the outlet of the heat exchange pipe to the heat radiator, and the usability is remarkably improved. In addition, by disposing a warm water tank and warm water circulation means on the warm water return side, heat resistance can be reduced without being subjected to thermal stress due to warm water, and costs can be reduced.
[0022]
【Example】
Embodiments of the present invention will be described below with reference to the drawings.
[0023]
Example 1
First, the structure of the hot water heating apparatus of Example 1 of this invention is demonstrated using FIG. 1, FIG. Reference numeral 21 denotes a pump that supplies fuel, and is led to the vaporization section by an oil feeding pipe 22. Reference numeral 23 denotes a blower motor, to which a fan 24 for supplying combustion air to the motor shaft and a fluffy fan 25 for rotating and atomizing the fuel supplied from the oil feeding pipe 24 are attached to the tip. Reference numeral 26 denotes a vaporizing cylinder in which a heater is embedded and heated to a predetermined temperature, whereby the atomized fuel is vaporized, mixed with combustion air, and ejected from a flame port portion 27 disposed on the upper side. The ejected vaporized gas is ignited by an ignition operation by an igniter, and combustion starts. Reference numeral 28 denotes a combustion ring that covers the periphery of the flame opening portion 27 that forms a combustion flame, and is provided with a plurality of air holes 28a for introducing secondary air around the upper portion thereof. Reference numeral 29 denotes a combustion cylinder which is a part for mixing the secondary air supplied from the secondary air hole 28a and the incomplete combustion gas that could not be completely combusted in the flame port 27 to complete combustion. 29a is erected in the substantially vertical direction at the tip of the combustion cylinder and inserted into the internal passage of the heat exchanger 30. Reference numeral 30 denotes a heat exchanger which is disposed on the upper portion of the combustion cylinder 29 and has a structure having a plurality of protrusions on the inner wall surface, and heat exchange is performed by the combustion gas passing through the gap between the protrusions on the inner wall surface. It has become. Reference numeral 31 denotes a resistance cylinder which is disposed at an appropriate position in the internal passage portion of the heat exchanger 30 and is provided with shielding plates 31a and 31b for shielding the passage of combustion gas at the lower end portion and the substantially central portion thereof. The shield plate 31a forms an exhaust resistance of the combustion gas, suppresses the flow rate of the combustion gas from the burner portion, and allows the combustion gas to uniformly pass through the gap between the convex portions provided on the inner wall surface of the heat exchanger 30. I have to. The shielding plate 31b provided substantially at the center secures a space 31c having a predetermined volume above the resistance cylinder 31 and forms a silencer for reducing combustion noise generated in the burner. Reference numeral 32 denotes a heat exchange pipe that starts the winding of the outer peripheral surface of the combustion cylinder 29 and heat-exchanges the hot water by winding it around the entire outer peripheral surface of the heat exchanger 30 provided on the substantially same surface as the outer peripheral surface. I have to. Reference numeral 33 denotes a temperature detector mounting bracket which is attached to the outer peripheral surface of the winding end portion of the heat exchange pipe 32 by brazing or the like, and the temperature detector 34 and the overheat prevention device 35 are attached to the surface. Further, when the heat exchange pipe 32 is wound around the outer peripheral surface of the combustion cylinder 29 and the heat exchanger 30, it is forced to have a flat shape such as an elliptical shape so as to increase the contact area with the outer peripheral surface. Reference numeral 36 denotes a hot water joint comprising a hot water going side 36a and a hot water returning side 36b. The hot water going side 36a is directly connected to the outlet of the heat exchange pipe 32 via a hot water pipe 37, and the heat exchanged hot water is directly taken into the room. It is made to convey to the heat radiator (not shown) installed in. The warm water return side 36b is connected to the inlet side of the heat exchange pipe 32 via the warm water tank 38 and the warm water circulation means 39.
[0024]
In addition, the black arrow in a figure shows the flow of combustion exhaust gas, and the white arrow shows the flow of warm water.
[0025]
Next, the operation of the hot water heating apparatus configured as described above will be described.
When an operation signal is input, an operation signal is sent to each load based on a sequence set in advance by a control unit (not shown). First, a heater (not shown) embedded in the vaporizing cylinder 26 is energized to heat the vaporizing cylinder 26 to a predetermined temperature. When the temperature reaches a predetermined temperature, combustion air and fuel are supplied by the blower motor 23 and the fuel pump 21. The supplied fuel is rotated and atomized by a fluffy fan 25 attached to the tip of the blower motor 23 and sprayed onto the inner wall of the vaporizing cylinder 26. Here, the fuel is vaporized and mixed with primary air which is combustion air, and is ejected from a flame port portion 27 having a plurality of flame ports disposed on the vaporization cylinder 26. The ejected vaporized gas is ignited by an ignition operation, forms a flame near the flame opening 27, and starts combustion. The combustion in the vicinity of the flame port 27 is determined by the mixing ratio with the primary air supplied from the central part of the vaporizing cylinder 26. In the burner of the type that forcibly supplies the combustion air as in the present invention, It is difficult to perform complete combustion only with primary air. For this reason, a secondary air intake hole 28a is provided above the flame opening 27, and the secondary air is introduced to complete combustion in the combustion cylinder 29 portion. I try to do it. For this reason, due to the burner configuration, the inside of the combustion cylinder 29 becomes a necessary combustion space, and the combustion cylinder 29 is heated to a high temperature. A structure that prevents thermal effects on other components was also required. Therefore, in the present invention, the heat exchange pipe 32 is wound around the outer peripheral surface of the combustion cylinder 29 to form a part of the heat exchanger 32, thereby reducing the shape surface and the thermal influence.
[0026]
The combustion gas generated in the combustion cylinder 29 is narrowed at the combustion cylinder front end portion 29 a, so that the flow velocity decreases at this portion, meanders and enters the internal passage of the heat exchanger 30. Since the resistance cylinder 31 is disposed at an appropriate place in the internal passage portion of the heat exchanger 30, and the lower end portion thereof is provided with a shielding plate 31a so as to block the passage of the combustion gas, the combustion gas is converted into the heat exchanger. It passes through the gap between the convex portions provided on the inner wall 30 and is discharged from the exhaust tube 40.
[0027]
Further, a shielding plate 31b is provided at a substantially central portion of the resistance cylinder 31, a space portion 31c having a predetermined volume is provided above the resistance cylinder 31, and an enlarged portion is provided in the middle of the combustion gas exhaust path. By adopting the configuration, a noise reduction effect is provided to reduce combustion noise, and when conditions such that vibration combustion occurs in the burner portion are suppressed by an enlarged portion provided in the exhaust path. Further, the combustion cylinder front end portion 29a stands up in a substantially vertical direction, and its inner diameter d1 is made smaller than the outer diameter d2 of the resistance cylinder 31, so that the scale adhering to the inner wall surface of the heat exchanger 30 is located at this standing portion. Since it accumulates and does not fall into the combustion part, the life of the burner can be extended.
[0028]
In the combustion operation as described above, hot water is ensured by circulating hot water in the heat exchange pipe 32 wound around the outer peripheral surface of the combustion cylinder 29 and the heat exchanger 30, and the warm water goes from the outlet of the heat exchange pipe 32. A warm water heater that rises quickly is provided by conveying hot water to a radiator installed indoors via the side joint 36a. In addition, since the outer peripheral surface of the combustion cylinder 29 heated to a high temperature is used as the start of winding of the heat exchange pipe 32, the rise of the hot water is accelerated and the cooling effect of the combustion cylinder 29 is increased. Furthermore, the heat exchange pipe 32 is fixed to the combustion cylinder 29 and the heat exchanger 30 by brazing the same metal fittings at appropriate positions at the start and end of winding, and between the adjacent heat exchanger pipes 32. By attaching and fixing, the strength is ensured and the contraction noise due to thermal shock and the vibration noise during pressure application are suppressed.
[0029]
【The invention's effect】
As described above, according to the first aspect of the present invention, the combustion cylinder heated to a high temperature by the combustion heat is formed as a structure in which the heat exchange pipe is wound around the outer peripheral surface of the combustion cylinder that forms the combustion chamber and contacts the combustion flame. Cooling by circulation of hot water to greatly reduce the temperature of the combustion cylinder improves the heat resistance of the combustion cylinder material and reduces the influence of other heat on the other components. At the same time, heat exchange of the hot water is performed in the combustion cylinder portion heated to this high temperature, so that the heat exchange efficiency is improved and the rising characteristics of the hot water can be greatly improved.
[0030]
According to the invention of claim 2, the combustion chamber formed in the combustion cylinder is completely combusted by secondary air, and the resistance plate creates a flow of combustion gas along the heat exchanger to increase the heat exchange rate. be able to. In addition, a heat exchange pipe is also wound around the outer peripheral surface of the combustion cylinder that forms the combustion chamber and contacts the combustion flame. The combustion cylinder heated to high temperature with the combustion heat is cooled by circulating hot water, greatly increasing the temperature of the combustion cylinder. By reducing the temperature, the heat resistance of the combustion cylinder material is improved, and the influence on other components due to radiant heat is also reduced. At the same time, heat exchange of the hot water is performed in the combustion cylinder portion heated to this high temperature, so that the heat exchange efficiency is improved and the rising characteristics of the hot water are greatly improved.
[0031]
According to the invention of claim 3, the combustion flame is prevented from coming into direct contact with the lower end of the heat exchanger to ensure the heat resistance of the heat exchanger, and the flow rate of the combustion gas is suppressed to meander and flow out. Thus, the combustion gas flows uniformly between the plurality of convex portions provided substantially uniformly on the inner wall surface of the heat exchanger. In addition, by raising the tip in a substantially vertical direction and making its inner diameter smaller than the outer diameter of the resistance cylinder, it is possible to prevent the dust and combustion residues from the downstream of the heat exchanger from falling on the burner. Life can be extended.
[0032]
According to the invention of claim 4, the shielding gas provided at the lower end portion of the resistance cylinder shields the combustion gas concentrated at the center of the internal passage portion of the heat exchanger, and a plurality of them provided substantially uniformly on the inner wall surface of the heat exchanger. By improving the heat exchange efficiency so that it flows evenly between the convex parts, and providing a shielding plate at the substantially central part, a space part of a predetermined volume is secured at the upper end part of the resistance cylinder, and the combustion noise generated in the burner part Can be absorbed.
[0033]
In addition, according to the invention of claim 5, contraction noise and vibration at the time of applying heat stress and pressure by securely supporting the winding start and winding end portions of the heat exchange pipe and fixing between adjacent heat exchange pipes. Sound can be prevented.
[0034]
According to the invention of claim 6, the contact area with the heat exchanger or the combustion cylinder is increased by adopting a flat shape such as an elliptical shape, improving the heat exchange efficiency and deforming the circular pipe. Cost reduction can be achieved by winding.
[0035]
Further, according to the invention of claim 7, by using the heat exchange pipe side wound around the outer peripheral surface of the combustion cylinder heated to a high temperature as the inlet of the hot water, the hot water is efficiently exchanged and the warm water rises. It is quick to improve usability. In addition, by attaching a temperature detector and an overheat prevention device to the heat exchange pipe surface wound around the downstream surface of the heat exchanger via metal fittings, it becomes possible to detect stable hot water temperature and control the optimal hot water temperature. .
[0036]
Further, according to the invention of claim 8, it is possible to expedite the blowing of warm air from the radiator by configuring the apparatus to convey hot water directly from the outlet of the heat exchange pipe to the radiator, and the usability is remarkably improved. Is. In addition, by disposing a warm water tank and warm water circulation means on the warm water return side, heat resistance can be reduced without being subjected to thermal stress due to warm water, and costs can be reduced.
[Brief description of the drawings]
FIG. 1 is a block diagram of a hot water heater according to a first embodiment of the present invention. FIG. 2 is a block diagram of a heat exchange pipe section of the hot water heater. FIG. 3 is a block diagram of a conventional hot water heater. Schematic diagram of the hot water heating system [Explanation of symbols]
DESCRIPTION OF SYMBOLS 21 Pump 23 Burner motor 24 Blower fan 25 Flicker fan 26 Vaporization cylinder 27 Flame port 28 Combustion ring 29 Combustion cylinder 30 Heat exchanger 31 Resistance cylinder 32 Heat exchange pipe 34 Temperature detector 35 Heating prevention device 36 Hot water joint 38 Hot water tank 39 Hot water Circulation means

Claims

A flame opening for mixing the vaporized fuel with combustion air and burning, and a heat exchanger for exchanging heat through the gaps between the plurality of projections provided on the inner wall of the combustion gas generated at the flame opening; , a combustion cylinder for guiding the combustion gases to the heat exchanger and having a space for complete combustion of the combustion gas generated by the burner port unit, and a hot water heat exchanger for heating the hot water through the heat exchanger, the A portion that is substantially flush with the outer circumferential surface of the heat exchanger is provided on the outer circumferential surface of the combustion cylinder, and the hot water heat exchanger starts to wind from the outer circumferential surface of the combustion cylinder having substantially the same surface as the outer circumferential surface of the heat exchanger. A hot water heater having a configuration in which a heat exchange pipe for heating hot water is wound around substantially the entire outer peripheral surface of the heat exchanger while adjoining each other .

A pump for supplying fuel, a blower fan for supplying combustion air is mounted, and a burner motor to which a fluffy fan for rotating and atomizing the fuel is attached at the tip of the shaft, and a heater for vaporizing the atomized fuel are incorporated. A combustion ring having a plurality of holes for covering the periphery of the flame port and supplying secondary air to the upper peripheral wall; and a flame port portion which is placed on the vaporization tube and ejects the vaporized gas. A combustion cylinder that covers the periphery of the combustion ring and mixes the incomplete combustion gas of the combustion flame formed at the flame opening portion with the secondary air for complete combustion, and a plurality of cylinders mounted on the upper part of the combustion cylinder and disposed on the inner wall A heat exchanger having a convex portion, and a bottomed cylindrical resistance cylinder provided in an inner passage portion of the heat exchanger and flowing a combustion gas guided from the combustion cylinder into a gap between the inner wall convex portions of the heat exchanger. comprising, an outer peripheral surface of the heat exchanger to the outer peripheral surface of the combustion cylinder and The portions having the same surface provided, the heat exchanger hot water substantially the entire outer peripheral surface of the heat exchanger while contacting the next to each other winding start from the outer peripheral surface of the combustion liner having an outer peripheral surface and substantially the same surface of the heat exchanger configuration and a warm water heating system wrapped with heat exchange pipe for.

The hot water heater according to claim 1 or 2, wherein the combustion cylinder is configured such that a tip end portion stands vertically, an inner diameter thereof is smaller than an outer shape of the resistance cylinder, and the combustion cylinder is inserted into an internal passage portion of the heat exchanger.

4. The resistance cylinder has a cylindrical shape, a shielding plate is disposed at a lower end and a substantially central portion thereof , and a space portion having a predetermined volume is formed at an upper portion to ensure a silencing effect . The hot water heater according to claim 1.

The heat exchange pipe is brazed with a mounting bracket made of the same material as the heat exchange pipe at the winding start portion of the outer peripheral surface of the combustion cylinder and the winding end portion of the outer peripheral surface of the heat exchanger, and the mounting bracket provided at the winding start portion is the combustion cylinder. The hot water heating apparatus according to claim 1 or 2, wherein the hot water heating apparatus is configured to be attached to and fixed by brazing between adjacent heat exchange pipes.

The hot water heating device according to any one of claims 1 to 4, wherein the heat exchange pipe is wound around the outer peripheral surface of the combustion cylinder and the heat exchanger while the circular pipe is deformed into a flat shape such as an elliptical shape.

The heat exchange pipe has the combustion tube winding side as the hot water inlet and the heat exchanger winding side as the outlet, and a plate-like metal fitting of the same material is brazed so as to contact the outer surface of the heat exchange pipe on the outlet side. The hot water heater according to any one of claims 1 to 5, wherein a temperature detector and an overheat prevention device are attached.

The heat exchange pipe is connected to the hot water outlet side of the hot water joint through the hot water pipe and directly conveyed to the radiator via the hot water pipe, with the hot water inlet side of the heat exchange pipe and the heat exchanger winding side as the outlet. The hot water heater according to any one of claims 1 to 6, wherein the inlet side supplies hot water from the hot water return side via a hot water tank and hot water circulation means.