【０００１】
【発明の属する技術分野】
この発明は、石油，ガスなどを燃料とする暖房用などの温水ボイラ、特にその熱交換器部分に関するものである。
【０００２】
【従来の技術】
図５は、特開平９−３０３８７５号公報に示された従来の温水ボイラを示す断面図であり、図において、１は燃焼用バーナユニットで、１ａはこのバーナユニットのヘッド部、１ｂは保炎用のガイドである。
１１は前記バーナユニット１のヘッド部１ａを囲み、その上部に燃焼室２を形成する内筒、１１ａはこの内筒１１の外周面に所定間隔で形成した環状リブ、１２は前記内筒１１の外周を小間隔を有して囲み、その上下両端部を内筒１１に溶接等によって水密に接合した外筒で、この外筒には前記内筒１１の環状リブ１１ａと対面する一部を外方向に突出させて形成した突起部１２ａを有している。
【０００３】
１３は前記内筒１１と外筒１２との間に形成された水壁層で、この水壁層は内筒１１の環状リブ１１ａによって上下方向に複数段に区分された形になり、外筒１２の突起部１２ａによって上下の水壁層１３間が連通する形になっている。
９は外筒１２の下部に設けた戻り口、１４は外筒１２の上部に設けた連絡口、１５はこれらで構成した中空円筒状を成す第１熱交換器である。
１６は前記第１熱交換器１５の内側上部に配置した円筒容器状を成す第２熱交換器であり、この第２熱交換器には一側に前記第１熱交換器１５の連絡口１４と接続管１７で連絡される連絡口１８と、その反対側に位置して温水往口１０を設けている。
【０００４】
１９は第１熱交換器１５の内壁と第２熱交換器１６の外壁との間に形成した小隙間からなる排ガス路、２０は第１熱交換器１５の上部開口を覆うフタで、排気口２１を有する。
２２はフタ２０と第２熱交換器１６の上面との間に形成した排ガス路、２３は第２熱交換器１６の底部に形成した凹部１６ａに上端部を固定され、下端部をバーナユニット１のヘッド部１ａ近傍に垂下配設した筒状の赤熱輻射体で、その直径はバーナユニット１のヘッド部１ａの直径よりは若干小さい径で構成され、下端開口部はキャップ２４で閉塞されている。
２５，２６は前記赤熱輻射体２３の上方部および中央部やや下方部に位置して設けた燃焼ガス通気孔である。
【０００５】
次に、動作について、説明する。
まず、温水の流れは、外筒１２下部の戻り口９より第１熱交換器１５内に入る。この第１熱交換器１５に入った低温水は内筒１１の外周面に当って左右二つに分流し、最下部の水壁層１３を半周回し、戻り口９に対して反対側に位置している内筒１１の環状リブ１１ａと外周１２の突起部１２ａの間に形成される小隙間部で合流上昇し、一段上の水壁層１３に移る。
一段上の水壁層１３に移った温水は内筒１１の外周面に当って再び左右二つに分流し、半周回して反対側に形成されている外周１２の突起部１２ａで合流し、さらに上段の水壁層１３へ移る。
このように、前述の流れを繰り返し、外筒１２上部の連絡口１４に達し、接続管１７を通って、連絡口１８から第２熱交換器１６内に入り、湯水往口１０から放熱器（図示せず）への循環回路へと導かれる。
【０００６】
一方、バーナユニット１のヘッド部１ａで形成された火炎は赤熱輻射体２３の外面に沿って上昇し、燃焼反応を終了した高温の燃焼ガスは、内筒１１の内壁面および第２熱交換器１６の熱交換部材１６ａの底部を直接加熱するとともに、前記赤熱輻射体２３は６００〜８００度に加熱されて赤熱し、輻射熱が放射される。
これにより、内筒１１の内壁面と第２熱交換器１６の熱交換部材１６ａの底部はさらに加熱されることによって受熱量を一層増加させる。
これらの受熱によって温度降下した燃焼ガスは、狭い排ガス路１９，２２を通過しながら、さらに第１熱交換器１５の上部と第２熱交換器１６の側面と上面を加熱し、燃焼熱を有効に熱交換器に伝え、フタ２０の排気口２１より排出される。
【０００７】
【発明が解決しようとする課題】
従来の温水ボイラの熱交換器は以上のように構成されているので、燃焼ガスが第２の熱交換器の内側に入らないと、そこでの熱交換ができないため、熱交換効率が悪いという問題点があった。
【０００８】
この発明は、上記の問題点を解消するためになされたもので、燃焼ガスが第２の熱交換器の内側に入りやすくすることによって、そこでの熱交換を増し、熱交換効率を向上させることを目的としている。
【０００９】
【課題を解決するための手段】
第１の発明に係る温水ボイラでは、燃焼用バーナと、このバーナの上部に燃焼室を形成する中空円筒状の周壁を有する第１の熱交換器と、この第１の熱交換器の内側上部に配設され円筒状の周壁を有する第２の熱交換器と、前記第２の熱交換器の周壁との間に所定の隙間を形成した周面および閉塞された上端面を有し前記燃焼室からの燃焼ガスを導入するように前記第２の熱交換器内部に取り付けられた円筒状の熱交換部材とを備え、第１の熱交換器上部周壁と第２の熱交換器の周壁との間に形成した小隙間からなる排ガス路を有する温水ボイラにおいて、前記燃焼室を上昇する燃焼ガスを前記熱交換部材の下端面開口から導入して前記熱交換部材の内部を加熱し被熱交換媒体との熱交換を行わせるとともに、前記第２の熱交換器の周壁下部に前記熱交換部材の取付部分よりも下方に延在し前記燃焼ガスの熱交換部材内部への上昇を誘導する円筒状のガイド部を設けたものである。
【００１０】
第２の発明に係る温水ボイラでは、第２の熱交換器の周壁下部に設けた円筒状ガイド部の下端周縁を第１の熱交換器側に広げるように設けたものである。
【００１１】
第３の発明に係る温水ボイラでは、第１の熱交換器側に広げられるように設けた第２の熱交換器の周壁下部に設けた円筒状ガイド部下端周縁の断面形状を曲面にしたものである。
【００１２】
第４の発明に係る温水ボイラでは、第２の熱交換器の周壁下部に設けた円筒状ガイド部下端周縁の数箇所を、第１の熱交換器に接するように設けたものである。
【００１３】
第５の発明に係る温水ボイラでは、燃焼用バーナと、このバーナの上部に燃焼室を形成する中空円筒状の周壁を有する第１の熱交換器と、この第１の熱交換器の内側上部に配設され円筒状の周壁を有する第２の熱交換器と、前記第２の熱交換器の周壁との間に所定の隙間を形成した周面および閉塞された上端面を有し前記燃焼室からの燃焼ガスを導入するように前記第２の熱交換器内部に取り付けられた円筒状の熱交換部材とを備え、第１の熱交換器上部周壁と第２の熱交換器の周壁との間に形成した小隙間からなる排ガス路を有する温水ボイラにおいて、前記第１の熱交換器の周壁近傍における燃焼ガスの上昇を阻止し燃焼室を上昇する燃焼ガスを中央部へ向けて集束する中空部材を設けたものである。
【００１４】
第６の発明に係る温水ボイラでは、前記中空部材の中空部の径を第２の熱交換器における円筒状熱交換部材の内径よりも小さくしたものである。
【００１５】
第７の発明に係る温水ボイラでは、燃焼用バーナと、このバーナの上部に燃焼室を形成する中空円筒の第１の熱交換器と、この第１の熱交換器の内側上部に配設され閉塞された上端面を有する円筒状の第２の熱交換器と、燃焼室中央部に配設され燃焼用バーナーの直径よりも小さい径を持つ筒状の赤熱輻射体を備え、第１の熱交換器上部内周壁と第２の熱交換器の外周壁との間に形成した小隙間からなる排ガス路を有する温水ボイラにおいて、前記第１の熱交換器の周壁近傍における燃焼ガスの上昇を阻止し燃焼室を上昇する燃焼ガスを中央部へ向けて集束する中空部材を設けたものである。
【００１６】
【発明の実施の形態】
実施の形態１．
この発明による温水ボイラの実施の形態１を図１に基づいて説明する。
図において、１は燃焼用バーナユニットで、１ａはこのバーナユニットのヘッド部、１ｂは保炎用のガイドである。
１１は前記バーナユニット１のヘッド部１ａを囲み、その上部に燃焼室２を形成する内筒、１１ａはこの内筒１１の外周面に外側に向かって突出するように所定間隔で形成した環状のリブ、１２は前記内筒１１の外周を小隙間を有して囲み、その上下両端部を内筒１１に溶接等によって水密に接合した外筒で、この外筒には前記内筒１１の環状リブ１１ａと対面する一部を外方向に突出させて形成した突起部１２ａを有している。
【００１７】
１３は前記内筒１１と外筒１２との間に形成された水壁層で、この水壁層は内筒１１の環状のリブ１１ａによって上下方向に複数層に仕切られており、外筒１２の突起部１２ａによって形成される隙間により一部で隣接する上下の水壁層１３間が交互に連通するようになっている。
９は外筒１２の下部に設けた戻り口、１４は外筒１２の上部に設けた連絡口、１５はこれらで構成した中空円筒状を成す第１の熱交換器である。
【００１８】
１６は前記第１の熱交換器１５の内側上部に配置した、有天円筒状、すなわち上端面を閉塞した円筒状を成す第２の熱交換器であり、この第２の熱交換器１６は、有天円筒状、すなわち上端面を閉塞した円筒状を成し、第２の熱交換器１６の周壁と所定の隙間を持ち、かつ、下端面開口周縁に突設した鍔状の取付部１６ｆを持つ熱交換部材１６ａをその内部に前記鍔状取付部１６ｆによって取り付けている。
そして、第２の熱交換器には、前記第１の熱交換器１５の連絡口１４と接続管１７で連絡される連絡口１８と、その反対側に位置して温水往口１０が設けられている。
１６ｂは、第２の熱交換器外周下部に設けた突張り部である。この突張り部１６ｂは熱交換部材１６ａの内部へ燃焼ガスを誘導する円筒状のガイド部を構成する。
１９は第１の熱交換器１５の内径と第２の熱交換器１６の外壁との間に形成した小隙間からなる排ガス路、２０は第１の熱交換器１５の上部開口を覆う天板で、排気口２１を有する２２は天板２０と第２の熱交換器１６の上面との間に形成した排ガス路である。
【００１９】
次に、上記構成からなる実施の形態１の作用について説明する。
まず、温水の流れは、外筒１２下部の戻り口９より第１の熱交換器１５内に入る。この第１の熱交換器１５に入った低温水は内筒１１の外周面に当たって左右二つに分流し、最下部の水壁層１３を半周回り、戻り口９に対して反対側に位置している内周１１の環状のリブ１１ａと外周１２の突起部１２ａの間に形成される小隙間で合流上昇し、一段上の水壁層１３に移る。
一段上の水壁層１３に移った温水は内筒１１の外周面に当たって再び左右二つに分流し、半周回して反対側に形成されている外筒１２の突起部１２ａで合流し、さらに上段の水壁層１３へ移る。
このように、前述の流れを繰り返し、外筒１２上部の連絡口１４に達し、接続管１７を通って連絡口１８から第２の熱交換器１６内に入り、湯水往口１０により放熱器（図示せず）への循環回路へと導かれる。
【００２０】
一方、バーナユニット１のヘッド部１ａで形成された火炎は、内筒１１の内部を上昇する。
燃焼反応を終了した高温の燃焼ガスは、赤熱輻射体等の存在しない燃焼室２内部の空間を直線的に上昇して、内筒１１の内壁面および第２の熱交換器１６内部に設けられた上端面を閉塞した円筒状熱交換部材１６ａの上端面部と内周壁面を直接加熱する。
【００２１】
これらの受熱によって温度降下した燃焼ガスは狭い排ガス路１９，２２を通過しながら、さらに第１の熱交換器１５の上部と第２の熱交換器１６の側面と上面を加熱し、燃焼熱を有効に熱交換器に伝え、天板２０の排気口２１から排出される。
【００２２】
燃焼ガスによって加熱された上端面を閉塞された円筒状熱交換部材１６ａは、主としてその周面を介して第２の熱交換器１６の外周面との間に存在する温水からなる被熱交換媒体と熱交換を行い、その温水を加熱する。
上述のように、円筒状熱交換部材１６ａの内部には、突張り部１６ｂからなる円筒状ガイド部によって燃焼ガスが誘導され、その周面部等は効果的に加熱されるので、円筒状熱交換部材１６ａによる温水からなる被熱交換媒体に対する熱交換作用は有効に達成される。
【００２３】
この発明による実施の形態１によれば、燃焼用バーナ１と、このバーナ１の上部に燃焼室を形成する中空円筒状の周壁を有する第１の熱交換器１５と、この第１の熱交換器１５の内側上部に配設され円筒状の周壁を有する第２の熱交換器１６と、第２の熱交換器１６の周壁との間に所定の隙間を形成した周面および閉塞された上端面を有し下端面開口周縁に突設した鍔状の取付部１６ｆにより前記第２の熱交換器１６内部に取り付けられた円筒状の熱交換部材１６ａとを備え、第１の熱交換器１５上部周壁と第２の熱交換器１６の周壁との間に形成した小隙間からなる排ガス路を有する温水ボイラにおいて、燃焼室２を上昇する燃焼ガスを熱交換部材１６ａの下端面開口から導入して熱交換部材１６ａの内部を加熱し接続管１７を介し導入されて第２の熱交換器１６の周壁との間に存在する温水からなる被熱交換媒体との熱交換を行わせるとともに、第２の熱交換器１６の周壁下部において熱交換部材１６ａの取付部分１６ｆよりも下方に延在し燃焼ガスの熱交換部材１６ａ内部への上昇を誘導する突張り部１６ｂからなる円筒状のガイド部を設けたので、燃焼ガスが第２の熱交換器１６の内部に設けた円筒状熱交換部材１６ａの内側に入りやすくなり、第２の熱交換器１６における熱交換効率が向上する。
【００２４】
実施の形態２．
図２は、この発明の実施の形態２を示す図である。
図２（ａ）は、第２の熱交換器１６の周壁下部において熱交換部材１６ａの取付部分１６ｆよりも下方に延在し燃焼ガスの熱交換部材１６ａ内部への上昇を誘導する突っ張り部１６ｂからなる円筒状ガイド部の下端周縁を第１の熱交換器側に広げて周縁拡大ガイド部１６ｃを形成したものである。
【００２５】
図２（ｂ）は、第１の熱交換器１５側に広げるように設けた、第２の熱交換器１６の周壁下部において熱交換部材１６ａの取付部分１６ｆよりも下方に延在し燃焼ガスの熱交換部材１６ａ内部への上昇を誘導する外周下部の突張り部１６ｂからなる円筒状ガイド部の断面形状を曲面として、突張り部１６ｄからなる曲面ガイド部を形成したものである。
【００２６】
図２（ｃ）は、第１の熱交換器１５側に広げるように設けた、第２の熱交換器１６の周壁下部において熱交換部材１６ａの取付部分１６ｆよりも下方に延在し燃焼ガスの熱交換部材１６ａ内部への上昇を誘導する突張り部１６ｂからなる円筒状ガイド部の下端周縁における数個所を第１の熱交換器に接するようにして、突張り部１６ｅからなる接合部を設けたものである。
【００２７】
このように構成すれば、燃焼ガスは第２の熱交換器の内側にさらに入りやすくなり、第２の熱交換器の内壁面での熱交換がさらに増し、熱交換効率がさらに向上する。
【００２８】
この発明による実施の形態２によれば、第２の熱交換器１６の周壁下部に設けた円筒状ガイド部１６ｃの下端周縁を第１の熱交換器側に広げるように設けたので、燃焼ガスが第２の熱交換器１６の内部に設けた円筒状熱交換部材１６ａの内側にさらに入りやすくなり、第２の熱交換器１６における熱交換効率がさらに向上することになる。
【００２９】
また、第１の熱交換器１５側に広げられるように設けた第２の熱交換器１６の周壁下部に設けた円筒状ガイド部１６ｄ下端周縁の断面形状を曲面にしたので、燃焼ガスが第２の熱交換器１６の内部に設けた円筒状熱交換部材１６ａの内側にさらに入りやすくなり、第２の熱交換器１６における熱交換効率がさらに向上することになる。
【００３０】
さらに、この発明による実施の形態２によれば、第２の熱交換器１６の周壁下部に設けた円筒状ガイド部下端周縁の数箇所を第１の熱交換器１５の周壁に接するようにして接合部１６ｅを設けたので、燃焼ガスが第２の熱交換器１６の内部に設けた円筒状熱交換部材１６ａの内側にさらに入りやすくなり、第２の熱交換器１６における熱交換効率がさらに向上することになる。
【００３１】
実施の形態３．
図３は、この発明の実施の形態３を示す図である。
バーナユニット１と第２の熱交換器１６の間に中空円板２７からなる円盤状の中空部材を設けたものである。
この中空円板２７からなる円盤状の中空部材は、第１の熱交換器１５の周壁近傍における燃焼ガスの上昇を阻止し燃焼室２内を上昇する燃焼ガスを燃焼室２の中央部に向けて集束するように作用する。
なお、第２の熱交換器１６外周下部の突張り部からなる燃焼ガスのガイド部はあっても、なくてもよい。
【００３２】
このように構成すれば、バーナーユニット１のヘッド部１ａで形成された火炎は、内筒１１の内部を上昇し、さらに中空円板２７の中空部２７ａを通って上昇するため、燃焼ガスは第２の熱交換器１６の内側に入りやすくなり、第２の熱交換器の内壁面での熱交換が増し、熱交換効率が向上する。
【００３３】
また、中空円板２７の中空部２７ａの径を第２の熱交換器１６における円筒状熱交換部材１６ａの内壁の径よりも小さくすると、燃焼ガスは第２の熱交換器１６の内側にさらに入りやすくなり、第２の熱交換器の内壁面での熱交換がさらに増し、熱交換効率がさらに向上する。
また、中空円板２７は、円板状でなく円筒状や中空の構体状からなる中空部材であってもよい。
【００３４】
この発明による実施の形態３によれば、燃焼用バーナ１と、このバーナ１の上部に燃焼室２を形成する中空円筒状の周壁を有する第１の熱交換器１５と、この第１の熱交換器１５の内側上部に配設され円筒状の周壁を有する第２の熱交換器１６と、第２の熱交換器１６の周壁との間に所定の隙間を形成した周面および閉塞された上端面を有し燃焼室２からの燃焼ガスを導入するように第２の熱交換器１６内部に取り付けられた円筒状の熱交換部材１６ａとを備え、第１の熱交換器１５上部周壁と第２の熱交換器１６の周壁との間に形成した小隙間からなる排ガス路を有する温水ボイラにおいて、第１の熱交換器１５の周壁近傍における燃焼ガスの上昇を阻止し燃焼室２を上昇する燃焼ガスを中央部へ向けて集束する中空円板２７からなる円盤状の中空部材を設けたので、燃焼ガスは第２の熱交換器１６の内側に入りやすくなり、第２の熱交換器１６の内壁面での熱交換が増し、熱交換効率が向上する。
【００３５】
また、この発明による実施の形態３によれば、燃焼用バーナ２と第２の熱交換器１６の間に設けた中空円板２７からなる円盤状の中空部材における中空部２７ａの径を第２の熱交換器１６における円筒状熱交換部材１６ａの内径よりも小さくしたので、燃焼ガスは第２の熱交換器１６における円筒状熱交換部材１６ａの内側に入りやすくなり、第２の熱交換器１６における円筒状熱交換部材１６ａの内壁面での熱交換が増し、熱交換効率が向上する。
【００３６】
実施の形態４．
図４は、この発明の実施の形態４を示す図である。
２３は第２の熱交換器１６の底部に形成した円筒状熱交換部材１６ａの上端面部に上端部を固定され、下端部をバーナユニット１のヘッド部１ａの近傍に垂下して燃焼室２の中央部に配設した筒状の赤熱輻射体で、その直径はバーナユニット１のヘッド部１ａの直径よりは小さい径で構成されている。
２７はバーナユニット１と第２の熱交換器１６の間に設けた中空円板からなる円盤状の中空部材である。
この中空円板２７からなる円盤状の中空部材は、第１の熱交換器１５の周壁近傍における燃焼ガスの上昇を阻止し燃焼室２内を上昇する燃焼ガスを燃焼室２の中央部に向けて集束するように作用する。
なお、第２の熱交換器１６外周下部の突張り部からなる燃焼ガスのガイド部はあっても、なくてもよい。
【００３７】
このように構成すれば、バーナーユニット１のヘッド部１ａで形成された火炎は、内筒１１の内部を上昇し、さらに中空円板２７の穴部２７ａを通ってしかも赤熱輻射体２３に沿って上昇するため、燃焼ガスは第２の熱交換器１６の内側に入りやすくなり、第２の熱交換器の内壁面での熱交換効率が向上する。
また、中空円板２７の穴部２７ａの穴径を第２の熱交換器１６の内壁の内径よりも小さくすると、燃焼ガスは第２の熱交換器１６の内側にさらに入りやすくなり、第２の熱交換器の内壁面での熱交換がさらに増し、熱交換効率がさらに向上する。
また、中空円板２７は円板状でなく円筒状や中空の構体状であってもよい。
【００３８】
この発明による実施の形態４によれば、燃焼用バーナ１と、このバーナ１の上部に燃焼室２を形成する中空円筒状の第１の熱交換器１５と、この第１の熱交換器１５の内側上部に配設され閉塞された上端面を有する円筒状の第２の熱交換器１６と、燃焼室２中央部に配設され燃焼用バーナヘッド１ａの直径よりも小さい径を持つ筒状の赤熱輻射体２３を備え、第１の熱交換器１５上部内周壁と第２の熱交換器１６の外周壁との間に形成した小隙間からなる排ガス路を有する温水ボイラにおいて、第１の熱交換器１５の周壁近傍における燃焼ガスの上昇を阻止し燃焼室２を上昇する燃焼ガスを中央部へ向けて集束する中空円板２７からなる円盤状の中空部材を設けたので、燃焼ガスは第２の熱交換器１６における円盤状の熱交換部材１６ａの内側に入りやすくなり、第２の熱交換器１６の内壁面での熱交換効率が向上する。
【００３９】
【発明の効果】
第１の発明によれば、燃焼用バーナと、このバーナの上部に燃焼室を形成する中空円筒状の周壁を有する第１の熱交換器と、この第１の熱交換器の内側上部に配設され円筒状の周壁を有する第２の熱交換器と、前記第２の熱交換器の周壁との間に所定の隙間を形成した周面および閉塞された上端面を有し前記第２の熱交換器内部に取り付けられた円筒状の熱交換部材とを備え、第１の熱交換器上部周壁と第２の熱交換器の周壁との間に形成した小隙間からなる排ガス路を有する温水ボイラにおいて、前記燃焼室を直線的に上昇する燃焼ガスを前記熱交換部材の下端面開口から導入して前記熱交換部材の内部を加熱し被熱交換媒体との熱交換を行わせるとともに、前記第２の熱交換器の外周壁下部に前記燃焼ガスの熱交換部材内部への上昇を誘導する円筒状のガイド部を設けたので、燃焼ガスが第２の熱交換器における円筒状熱交換部材の内側に入りやすくなり、そこでの熱交換が増して、熱交換効率が向上する。
【００４０】
第２の発明によれば、第２の熱交換器の周壁下部に設けた円筒状ガイド部の下端周縁を第１の熱交換器側に広げるように設けたので、燃焼ガスが第２の熱交換器における円筒状熱交換部材の内側に入りやすくなり、そこでの熱交換が増し、熱交換効率が向上する。
【００４１】
第３の発明によれば、第１の熱交換器側に広げられるように設けた第２の熱交換器の周壁下部に設けた円筒状ガイド部下端周縁の断面形状を曲面にしたので、燃焼ガスが第２の熱交換器における円筒状熱交換部材の内側に入りやすくなり、そこでの熱交換が増して、熱交換効率が向上する。
【００４２】
第４の発明によれば、第２の熱交換器の周壁下部に設けた円筒状ガイド部下端周縁の数箇所を第１の熱交換器に接するように設けたので、燃焼ガスが第２の熱交換器における円筒状熱交換部材の内側に入りやすくなり、そこでの熱交換が増して、熱交換効率が向上する。
【００４３】
第５の発明によれば、燃焼用バーナと、このバーナの上部に燃焼室を形成する中空円筒状の周壁を有する第１の熱交換器と、この第１の熱交換器の内側上部に配設され円筒状の周壁を有する第２の熱交換器と、前記第２の熱交換器の周壁との間に所定の隙間を形成した周面および閉塞された上端面を有し前記燃焼室からの燃焼ガスを導入するように前記第２の熱交換器内部に取り付けられた円筒状の熱交換部材とを備え、第１の熱交換器上部周壁と第２の熱交換器の周壁との間に形成した小隙間からなる排ガス路を有する温水ボイラにおいて、前記第１の熱交換器の周壁近傍における燃焼ガスの上昇を阻止し燃焼室を上昇する燃焼ガスを中央部へ向けて集束する中空部材を設けたので、燃焼ガスが第２の熱交換器における円筒状熱交換部材の内側に入りやすくなり、そこでの熱交換が増して、熱交換効率が向上する。
【００４４】
第６の発明によれば、前記中空部材の中空部の径を第２の熱交換器における円筒状熱交換部材の内径よりも小さくしたので、燃焼ガスが第２の熱交換器における円筒状熱交換部材の内側に入りやすくなり、そこでの熱交換が増して、熱交換効率が向上する。
【００４５】
第７の発明によれば、燃焼用バーナと、このバーナの上部に燃焼室を形成する中空円筒の第１の熱交換器と、この第１の熱交換器の内側上部に配設され閉塞された上端面を有する円筒状の第２の熱交換器と、燃焼室中央部に配設され燃焼用バーナーの直径よりも小さい径を持つ筒状の赤熱輻射体を備え、第１の熱交換器上部内周壁と第２の熱交換器の外周壁との間に形成した小隙間からなる排ガス路を有する温水ボイラにおいて、前記第１の熱交換器の周壁近傍における燃焼ガスの上昇を阻止し燃焼室を上昇する燃焼ガスを中央部へ向けて集束する中空部材を設けたので、燃焼ガスが第２の熱交換器の内側に入りやすくなり、そこでの熱交換が増して、熱交換効率が向上する。
【図面の簡単な説明】
【図１】 この発明による実施の形態１を示す温水ボイラの要部断面図である。
【図２】 この発明による実施の形態２を示す温水ボイラの要部断面図である。
【図３】 この発明による実施の形態３を示す温水ボイラの要部断面図である。
【図４】 この発明による実施の形態４を示す温水ボイラの要部断面図である。
【図５】 従来の温水ボイラを示す断面図である。
【符号の説明】
１ バーナユニット、２ 燃焼室、９ 戻り口、１０ 温水往口、１１ 内筒、１１ａ 環状のリブ、１２ 外筒、１２ａ 突起部、１３ 水壁層、１４ 連絡口、１５ 第１の熱交換器、１６ 第２の熱交換器、１６ａ 熱交換部材、１６ｂ 第２の熱交換器の外周突張り部、１６ｃ 第２の熱交換器の外周突張り部、１６ｄ 第２の熱交換器の外周突張り部、１６ｅ 第２の熱交換器の外周突張り部、１６ｆ 取付部分、１８ 連結管、１９ 排ガス路、２０ 天板、２２ 排ガス路、２３ 赤熱輻射体、２７ 中空円板、２７ａ 中空円板の中空部。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hot water boiler for heating using oil, gas or the like as a fuel, and particularly to a heat exchanger portion thereof.
[0002]
[Prior art]
FIG. 5 is a sectional view showing a conventional hot water boiler disclosed in Japanese Patent Application Laid-Open No. 9-303875. In the figure, 1 is a burner unit for combustion, 1a is a head portion of this burner unit, and 1b is a flame holding member. It is a guide for.
11 is an inner cylinder that surrounds the head portion 1a of the burner unit 1 and forms a combustion chamber 2 at the upper part thereof, 11a is an annular rib formed on the outer peripheral surface of the inner cylinder 11 at a predetermined interval, and 12 is an inner cylinder 11 An outer cylinder that surrounds the outer periphery with a small interval and whose upper and lower ends are joined to the inner cylinder 11 in a water-tight manner by welding or the like. A part of the outer cylinder that faces the annular rib 11a of the inner cylinder 11 is outside. It has a protrusion 12a formed so as to protrude in the direction.
[0003]
Reference numeral 13 denotes a water wall layer formed between the inner cylinder 11 and the outer cylinder 12, and this water wall layer is divided into a plurality of stages in the vertical direction by the annular rib 11a of the inner cylinder 11, and the outer cylinder The upper and lower water wall layers 13 are communicated with each other by twelve protrusions 12a.
9 is a return port provided in the lower part of the outer cylinder 12, 14 is a communication port provided in the upper part of the outer cylinder 12, and 15 is a first heat exchanger having a hollow cylindrical shape constituted by these.
Reference numeral 16 denotes a second heat exchanger in the form of a cylindrical container disposed on the inner upper portion of the first heat exchanger 15, and the second heat exchanger has a communication port 14 of the first heat exchanger 15 on one side. A connecting port 18 communicated by the connecting pipe 17 and a hot water outlet 10 are provided on the opposite side.
[0004]
19 is an exhaust gas path consisting of a small gap formed between the inner wall of the first heat exchanger 15 and the outer wall of the second heat exchanger 16, and 20 is a lid covering the upper opening of the first heat exchanger 15, 21.
22 is an exhaust gas path formed between the lid 20 and the upper surface of the second heat exchanger 16, 23 is fixed at the upper end to a recess 16a formed at the bottom of the second heat exchanger 16, and the lower end is burner unit 1. This is a cylindrical red heat radiator that is suspended in the vicinity of the head portion 1 a, the diameter of which is slightly smaller than the diameter of the head portion 1 a of the burner unit 1, and the lower end opening is closed by a cap 24. .
Reference numerals 25 and 26 denote combustion gas vent holes provided at the upper part and the central part of the red heat radiator 23 and slightly below.
[0005]
Next, the operation will be described.
First, the flow of warm water enters the first heat exchanger 15 from the return port 9 at the bottom of the outer cylinder 12. The low-temperature water that has entered the first heat exchanger 15 hits the outer peripheral surface of the inner cylinder 11 and splits into two left and right, half-circulates the lowermost water wall layer 13, and is located on the opposite side of the return port 9. In the small gap formed between the annular rib 11a of the inner cylinder 11 and the protrusion 12a of the outer periphery 12, the merging and rising are performed, and the water wall layer 13 is moved up one level.
The hot water that has moved to the upper water wall layer 13 hits the outer peripheral surface of the inner cylinder 11 and splits it into two left and right again, and joins at the protruding portion 12a of the outer periphery 12 that is formed on the opposite side by a half turn. Move to upper water wall layer 13.
In this way, the above-described flow is repeated to reach the communication port 14 at the upper part of the outer cylinder 12, through the connection pipe 17, enter the second heat exchanger 16 through the connection port 18, and from the hot water outlet 10 to the radiator ( To the circulation circuit (not shown).
[0006]
On the other hand, the flame formed by the head portion 1a of the burner unit 1 rises along the outer surface of the red heat radiator 23, and the high-temperature combustion gas that has finished the combustion reaction is the inner wall surface of the inner cylinder 11 and the second heat exchanger. In addition to directly heating the bottom of the 16 heat exchange members 16a, the red heat radiating body 23 is heated to 600 to 800 degrees to become red hot, and radiant heat is emitted.
As a result, the inner wall surface of the inner cylinder 11 and the bottom of the heat exchange member 16a of the second heat exchanger 16 are further heated to further increase the amount of heat received.
The combustion gas that has fallen in temperature due to the received heat further passes through the narrow exhaust gas passages 19 and 22 and further heats the upper part of the first heat exchanger 15 and the side and upper surfaces of the second heat exchanger 16 to effectively use the combustion heat. To the heat exchanger and discharged from the exhaust port 21 of the lid 20.
[0007]
[Problems to be solved by the invention]
Since the heat exchanger of the conventional hot water boiler is configured as described above, if the combustion gas does not enter the second heat exchanger, heat exchange cannot be performed there, so that the heat exchange efficiency is poor. There was a point.
[0008]
The present invention has been made to solve the above-described problems. By making combustion gas easily enter the inside of the second heat exchanger, heat exchange there is increased and heat exchange efficiency is improved. It is an object.
[0009]
[Means for Solving the Problems]
In the hot water boiler according to the first invention, a combustion burner, a first heat exchanger having a hollow cylindrical peripheral wall forming a combustion chamber at the upper portion of the burner, and an inner upper portion of the first heat exchanger And a second heat exchanger having a cylindrical peripheral wall, a peripheral surface forming a predetermined gap between the peripheral wall of the second heat exchanger, and a closed upper end surface. A cylindrical heat exchange member mounted inside the second heat exchanger so as to introduce combustion gas from the chamber, and a first heat exchanger upper peripheral wall and a second heat exchanger peripheral wall; In the hot water boiler having an exhaust gas path formed by a small gap formed between the combustion chambers, the combustion gas rising in the combustion chamber is introduced from the lower end surface opening of the heat exchange member to heat the inside of the heat exchange member and perform heat exchange A heat exchange with the medium is performed, and the lower part of the peripheral wall of the second heat exchanger It is provided with a cylindrical guide portion for inducing an increase in the heat exchange member inside the extension Mashimashi the combustion gas lower than the mounting portion of the heat exchange member.
[0010]
In the hot water boiler which concerns on 2nd invention, it provided so that the lower end periphery of the cylindrical guide part provided in the surrounding wall lower part of the 2nd heat exchanger might be extended to the 1st heat exchanger side.
[0011]
In the hot water boiler according to the third invention, the cross-sectional shape of the peripheral edge of the lower end of the cylindrical guide provided at the lower part of the peripheral wall of the second heat exchanger provided so as to be spread toward the first heat exchanger is curved. It is.
[0012]
In the hot water boiler according to the fourth aspect of the present invention, several portions of the peripheral edge of the lower end of the cylindrical guide provided at the lower portion of the peripheral wall of the second heat exchanger are provided so as to be in contact with the first heat exchanger.
[0013]
In the hot water boiler according to the fifth invention, a combustion burner, a first heat exchanger having a hollow cylindrical peripheral wall forming a combustion chamber at the upper portion of the burner, and an inner upper portion of the first heat exchanger And a second heat exchanger having a cylindrical peripheral wall, a peripheral surface forming a predetermined gap between the peripheral wall of the second heat exchanger, and a closed upper end surface. A cylindrical heat exchange member mounted inside the second heat exchanger so as to introduce combustion gas from the chamber, and a first heat exchanger upper peripheral wall and a second heat exchanger peripheral wall; In the hot water boiler having an exhaust gas path composed of small gaps formed between the first and second heat exchangers, the combustion gas rising in the combustion chamber is prevented from rising near the peripheral wall of the first heat exchanger and focused toward the central portion. A hollow member is provided.
[0014]
In the hot water boiler according to the sixth invention, the diameter of the hollow portion of the hollow member is made smaller than the inner diameter of the cylindrical heat exchange member in the second heat exchanger.
[0015]
In the hot water boiler according to the seventh invention, a combustion burner, a hollow cylindrical first heat exchanger that forms a combustion chamber above the burner, and an inner upper portion of the first heat exchanger are disposed. A cylindrical second heat exchanger having a closed upper end surface, and a tubular red heat radiator disposed in the center of the combustion chamber and having a diameter smaller than that of the combustion burner. In a hot water boiler having an exhaust gas path consisting of a small gap formed between the upper inner peripheral wall of the exchanger and the outer peripheral wall of the second heat exchanger, an increase in combustion gas in the vicinity of the peripheral wall of the first heat exchanger is prevented. Then, a hollow member for converging the combustion gas rising in the combustion chamber toward the center is provided.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Embodiment 1 FIG.
Embodiment 1 of a hot water boiler according to the present invention will be described with reference to FIG.
In the figure, 1 is a combustion burner unit, 1a is a head portion of this burner unit, and 1b is a flame holding guide.
11 is an inner cylinder that surrounds the head portion 1a of the burner unit 1 and forms a combustion chamber 2 at the upper part thereof, and 11a is an annular formed at a predetermined interval so as to protrude outwardly from the outer peripheral surface of the inner cylinder 11 A rib 12 is an outer cylinder that surrounds the outer periphery of the inner cylinder 11 with a small gap, and whose upper and lower ends are joined to the inner cylinder 11 in a watertight manner by welding or the like. The outer cylinder has an annular shape of the inner cylinder 11. A protrusion 12a is formed by projecting a part facing the rib 11a outward.
[0017]
Reference numeral 13 denotes a water wall layer formed between the inner cylinder 11 and the outer cylinder 12, and this water wall layer is partitioned into a plurality of layers in the vertical direction by an annular rib 11a of the inner cylinder 11, and the outer cylinder 12 The upper and lower water wall layers 13 that are partially adjacent to each other are alternately communicated by a gap formed by the protruding portion 12a.
9 is a return port provided in the lower part of the outer cylinder 12, 14 is a communication port provided in the upper part of the outer cylinder 12, and 15 is a first heat exchanger having a hollow cylindrical shape constituted by these.
[0018]
Reference numeral 16 denotes a second heat exchanger disposed on the inner upper portion of the first heat exchanger 15 and having a cylindrical shape, that is, a cylindrical shape having a closed upper end surface. The second heat exchanger 16 is , A cylindrical cylindrical shape, that is, a cylindrical shape whose upper end surface is closed, has a predetermined clearance from the peripheral wall of the second heat exchanger 16, and has a bowl-shaped mounting portion 16f projecting from the peripheral edge of the lower end surface opening The heat exchanging member 16a having the above is attached to the inside thereof by the hook-shaped attaching portion 16f.
The second heat exchanger is provided with a communication port 18 connected to the communication port 14 of the first heat exchanger 15 and the connection pipe 17, and a hot water outlet 10 located on the opposite side. ing.
16b is a projecting portion provided at the lower outer periphery of the second heat exchanger. The projecting portion 16b constitutes a cylindrical guide portion that guides combustion gas into the heat exchange member 16a.
19 is an exhaust gas path consisting of a small gap formed between the inner diameter of the first heat exchanger 15 and the outer wall of the second heat exchanger 16, and 20 is a top plate that covers the upper opening of the first heat exchanger 15. The exhaust port 21 is an exhaust gas path formed between the top plate 20 and the upper surface of the second heat exchanger 16.
[0019]
Next, the operation of the first embodiment configured as described above will be described.
First, the flow of warm water enters the first heat exchanger 15 from the return port 9 at the bottom of the outer cylinder 12. The low-temperature water that has entered the first heat exchanger 15 hits the outer peripheral surface of the inner cylinder 11 and splits into two, left and right, and goes around the lowermost water wall layer 13 halfway and is located on the opposite side to the return port 9. Ascending at a small gap formed between the annular rib 11a on the inner circumference 11 and the protrusion 12a on the outer circumference 12, and moves to the upper water wall layer 13.
The hot water that has moved to the upper water wall layer 13 strikes the outer peripheral surface of the inner cylinder 11 and again splits into two left and right, and joins at the protrusion 12a of the outer cylinder 12 that is formed on the opposite side by a half turn. The water wall layer 13 is moved to.
In this way, the above-described flow is repeated to reach the communication port 14 at the upper part of the outer cylinder 12, enter the second heat exchanger 16 through the connection port 18 through the connection pipe 17, and the radiator ( To the circulation circuit (not shown).
[0020]
On the other hand, the flame formed by the head portion 1 a of the burner unit 1 rises inside the inner cylinder 11.
The high-temperature combustion gas that has finished the combustion reaction rises linearly in the space inside the combustion chamber 2 where no red heat radiator or the like is present, and is provided inside the inner wall surface of the inner cylinder 11 and the second heat exchanger 16. The upper end surface portion and the inner peripheral wall surface of the cylindrical heat exchange member 16a with the upper end surface closed are directly heated.
[0021]
The combustion gas that has fallen in temperature due to the received heat passes through the narrow exhaust gas passages 19 and 22, and further heats the upper part of the first heat exchanger 15 and the side and upper surfaces of the second heat exchanger 16. The heat is effectively transmitted to the heat exchanger and discharged from the exhaust port 21 of the top plate 20.
[0022]
The cylindrical heat exchange member 16a whose upper end surface heated by the combustion gas is closed is mainly a heat exchange medium made of hot water existing between the outer peripheral surface of the second heat exchanger 16 through the peripheral surface thereof. Heat exchange with the water.
As described above, combustion gas is induced inside the cylindrical heat exchange member 16a by the cylindrical guide portion formed of the projecting portion 16b, and the peripheral surface portion and the like are effectively heated. The heat exchange effect on the heat exchange medium made of warm water by the member 16a is effectively achieved.
[0023]
According to Embodiment 1 of the present invention, a combustion burner 1, a first heat exchanger 15 having a hollow cylindrical peripheral wall that forms a combustion chamber in the upper portion of the burner 1, and the first heat exchange. A second heat exchanger 16 having a cylindrical peripheral wall disposed on the inner upper portion of the heat exchanger 15, and a peripheral surface forming a predetermined gap between the peripheral wall of the second heat exchanger 16 and the closed top The first heat exchanger 15 includes a cylindrical heat exchange member 16a attached to the inside of the second heat exchanger 16 by a flange-like attachment portion 16f that has an end face and projects from the periphery of the lower end opening. In a hot water boiler having an exhaust gas path composed of a small gap formed between the upper peripheral wall and the peripheral wall of the second heat exchanger 16, the combustion gas rising in the combustion chamber 2 is introduced from the lower end surface opening of the heat exchange member 16a. The inside of the heat exchange member 16a is heated and introduced through the connecting pipe 17. Heat exchange with a heat exchange medium made of hot water existing between the peripheral wall of the second heat exchanger 16 and a mounting portion of the heat exchange member 16a at the lower part of the peripheral wall of the second heat exchanger 16 Since the cylindrical guide portion that includes the projecting portion 16b that extends below 16f and induces the combustion gas to rise inside the heat exchange member 16a is provided, the combustion gas is contained inside the second heat exchanger 16. It becomes easy to enter the inside of the cylindrical heat exchange member 16a provided in the heat exchanger, and the heat exchange efficiency in the second heat exchanger 16 is improved.
[0024]
Embodiment 2. FIG.
FIG. 2 is a diagram showing a second embodiment of the present invention.
FIG. 2A shows a strut 16b that extends below the mounting portion 16f of the heat exchange member 16a at the lower peripheral wall of the second heat exchanger 16 and induces the combustion gas to rise inside the heat exchange member 16a. The peripheral edge expanding guide portion 16c is formed by expanding the lower peripheral edge of the cylindrical guide portion made of the above to the first heat exchanger side.
[0025]
FIG. 2B shows a combustion gas extending below the mounting portion 16f of the heat exchange member 16a at the lower peripheral wall of the second heat exchanger 16 provided so as to spread toward the first heat exchanger 15 side. The curved guide portion is formed by the projecting portion 16d, with the cross-sectional shape of the cylindrical guide portion formed by the projecting portion 16b at the lower outer periphery that induces the heat exchange member 16a rising to the inside as a curved surface.
[0026]
FIG. 2C shows a combustion gas extending below the mounting portion 16f of the heat exchange member 16a at the lower portion of the peripheral wall of the second heat exchanger 16 provided so as to spread toward the first heat exchanger 15 side. The joint part consisting of the projecting part 16e is made so that several points on the lower edge of the cylindrical guide part consisting of the projecting part 16b that induces the rise of the heat exchanger member 16a to the inside of the heat exchange member 16a are in contact with the first heat exchanger. It is provided.
[0027]
If comprised in this way, it will become easy to enter combustion gas inside a 2nd heat exchanger, the heat exchange in the inner wall face of a 2nd heat exchanger will further increase, and heat exchange efficiency will further improve.
[0028]
According to the second embodiment of the present invention, the lower end periphery of the cylindrical guide portion 16c provided at the lower portion of the peripheral wall of the second heat exchanger 16 is provided so as to spread toward the first heat exchanger, so the combustion gas Becomes easier to enter inside the cylindrical heat exchange member 16a provided inside the second heat exchanger 16, and the heat exchange efficiency in the second heat exchanger 16 is further improved.
[0029]
In addition, since the cross-sectional shape of the lower end periphery of the cylindrical guide portion 16d provided at the lower portion of the peripheral wall of the second heat exchanger 16 provided so as to be spread toward the first heat exchanger 15 is curved, the combustion gas is It becomes easier to enter the inside of the cylindrical heat exchange member 16 a provided inside the second heat exchanger 16, and the heat exchange efficiency in the second heat exchanger 16 is further improved.
[0030]
Furthermore, according to the second embodiment of the present invention, several places on the lower peripheral edge of the cylindrical guide portion provided at the lower portion of the peripheral wall of the second heat exchanger 16 are in contact with the peripheral wall of the first heat exchanger 15. Since the joint portion 16e is provided, the combustion gas can easily enter the inside of the cylindrical heat exchange member 16a provided in the second heat exchanger 16, and the heat exchange efficiency in the second heat exchanger 16 is further increased. Will improve.
[0031]
Embodiment 3 FIG.
FIG. 3 is a diagram showing a third embodiment of the present invention.
A disc-shaped hollow member made of a hollow disc 27 is provided between the burner unit 1 and the second heat exchanger 16.
The disk-shaped hollow member made of the hollow disk 27 prevents the combustion gas from rising near the peripheral wall of the first heat exchanger 15 and directs the combustion gas rising in the combustion chamber 2 toward the center of the combustion chamber 2. Acts to focus.
Note that there may or may not be a combustion gas guide portion consisting of a projecting portion at the lower outer periphery of the second heat exchanger 16.
[0032]
If comprised in this way, the flame formed with the head part 1a of the burner unit 1 will raise the inside of the inner cylinder 11, and will further rise through the hollow part 27a of the hollow disc 27, Therefore Combustion gas is 1st. It becomes easier to enter the inside of the second heat exchanger 16, heat exchange on the inner wall surface of the second heat exchanger is increased, and heat exchange efficiency is improved.
[0033]
Further, when the diameter of the hollow portion 27 a of the hollow disk 27 is made smaller than the diameter of the inner wall of the cylindrical heat exchange member 16 a in the second heat exchanger 16, the combustion gas further enters the inside of the second heat exchanger 16. It becomes easy to enter, heat exchange on the inner wall surface of the second heat exchanger is further increased, and the heat exchange efficiency is further improved.
Further, the hollow disk 27 may be a hollow member having a cylindrical shape or a hollow structure instead of a disk shape.
[0034]
According to Embodiment 3 of the present invention, the combustion burner 1, the first heat exchanger 15 having a hollow cylindrical peripheral wall forming the combustion chamber 2 at the upper part of the burner 1, and the first heat A second heat exchanger 16 disposed on the inner upper portion of the exchanger 15 and having a cylindrical peripheral wall, and a peripheral surface forming a predetermined gap between the peripheral wall of the second heat exchanger 16 and the closed surface are closed. A cylindrical heat exchange member 16a having an upper end surface and attached to the inside of the second heat exchanger 16 so as to introduce combustion gas from the combustion chamber 2, and an upper peripheral wall of the first heat exchanger 15; In the hot water boiler having an exhaust gas path formed by a small gap formed between the peripheral wall of the second heat exchanger 16 and the combustion chamber 2 is raised by preventing the combustion gas from rising near the peripheral wall of the first heat exchanger 15. Disk comprising a hollow disk 27 for converging the combustion gas to be directed toward the center Is provided with the hollow members, the combustion gas is likely to enter the inside of the second heat exchanger 16, heat exchange with the inner wall surface of the second heat exchanger 16 is increased, thereby improving the heat exchange efficiency.
[0035]
Further, according to the third embodiment of the present invention, the diameter of the hollow portion 27a in the disc-shaped hollow member made of the hollow disc 27 provided between the combustion burner 2 and the second heat exchanger 16 is set to the second value. Since the inner diameter of the cylindrical heat exchange member 16a in the heat exchanger 16 is smaller than the inner diameter, the combustion gas easily enters the inside of the cylindrical heat exchange member 16a in the second heat exchanger 16, and the second heat exchanger The heat exchange on the inner wall surface of the cylindrical heat exchange member 16a in 16 is increased, and the heat exchange efficiency is improved.
[0036]
Embodiment 4 FIG.
FIG. 4 is a diagram showing a fourth embodiment of the present invention.
23 is fixed to the upper end surface of a cylindrical heat exchange member 16a formed at the bottom of the second heat exchanger 16, and the lower end is suspended near the head portion 1a of the burner unit 1 so that the combustion chamber 2 It is a cylindrical red heat radiator disposed in the center, and the diameter thereof is smaller than the diameter of the head portion 1a of the burner unit 1.
Reference numeral 27 denotes a disk-shaped hollow member made of a hollow disk provided between the burner unit 1 and the second heat exchanger 16.
The disk-shaped hollow member made of the hollow disk 27 prevents the combustion gas from rising near the peripheral wall of the first heat exchanger 15 and directs the combustion gas rising in the combustion chamber 2 toward the center of the combustion chamber 2. Acts to focus.
Note that there may or may not be a combustion gas guide portion consisting of a projecting portion at the lower outer periphery of the second heat exchanger 16.
[0037]
If comprised in this way, the flame formed with the head part 1a of the burner unit 1 will raise the inside of the inner cylinder 11, and will further pass along the hole 27a of the hollow disc 27, and along the red-heat radiator 23. Since it rises, combustion gas becomes easy to enter the inside of the 2nd heat exchanger 16, and the heat exchange efficiency in the inner wall surface of the 2nd heat exchanger improves.
Further, if the hole diameter of the hole portion 27a of the hollow disk 27 is made smaller than the inner diameter of the inner wall of the second heat exchanger 16, the combustion gas is more likely to enter the second heat exchanger 16, and the second The heat exchange on the inner wall surface of the heat exchanger is further increased, and the heat exchange efficiency is further improved.
Further, the hollow disc 27 may be a cylindrical shape or a hollow structure instead of the disc shape.
[0038]
According to Embodiment 4 of the present invention, the combustion burner 1, the hollow cylindrical first heat exchanger 15 that forms the combustion chamber 2 in the upper part of the burner 1, and the first heat exchanger 15 A cylindrical second heat exchanger 16 having a closed upper end surface disposed on the inner upper side of the cylinder and a cylindrical shape having a diameter smaller than the diameter of the combustion burner head 1a disposed in the center of the combustion chamber 2. In the hot water boiler having the red heat radiator 23 and having an exhaust gas path composed of a small gap formed between the upper inner peripheral wall of the first heat exchanger 15 and the outer peripheral wall of the second heat exchanger 16, Since the disc-shaped hollow member made up of the hollow disc 27 for preventing the combustion gas from rising near the peripheral wall of the heat exchanger 15 and concentrating the combustion gas rising in the combustion chamber 2 toward the central portion is provided, Of the disk-shaped heat exchange member 16a in the second heat exchanger 16 Easily enters the heat exchange efficiency of the inner wall surface of the second heat exchanger 16 is improved.
[0039]
【The invention's effect】
According to the first invention, a combustion burner, a first heat exchanger having a hollow cylindrical peripheral wall forming a combustion chamber in the upper part of the burner, and an inner upper part of the first heat exchanger are arranged. A second heat exchanger having a cylindrical peripheral wall, a peripheral surface forming a predetermined gap between the peripheral wall of the second heat exchanger, and a closed upper end surface. A hot water having a cylindrical heat exchange member attached to the inside of the heat exchanger, and having an exhaust gas path consisting of a small gap formed between the upper peripheral wall of the first heat exchanger and the peripheral wall of the second heat exchanger In the boiler, the combustion gas that rises linearly in the combustion chamber is introduced from the lower end surface opening of the heat exchange member to heat the inside of the heat exchange member to exchange heat with the heat exchange medium, and Invite the combustion gas to rise inside the heat exchange member at the lower part of the outer peripheral wall of the second heat exchanger Since there is provided a cylindrical guide portion for the combustion gas is likely to enter the inside of the cylindrical heat exchanging member in the second heat exchanger, wherein the heat exchanger is increased, and improves the heat exchange efficiency.
[0040]
According to the second aspect of the invention, since the lower end peripheral edge of the cylindrical guide portion provided at the lower peripheral wall of the second heat exchanger is provided so as to extend toward the first heat exchanger, the combustion gas is supplied with the second heat. It becomes easy to enter the inside of the cylindrical heat exchange member in the exchanger, heat exchange there increases, and heat exchange efficiency is improved.
[0041]
According to the third invention, since the cross-sectional shape of the peripheral edge of the cylindrical guide portion provided at the lower portion of the peripheral wall of the second heat exchanger provided so as to be spread toward the first heat exchanger is curved, Gas easily enters the inside of the cylindrical heat exchange member in the second heat exchanger, heat exchange there increases, and heat exchange efficiency is improved.
[0042]
According to the fourth aspect of the invention, since the several places on the lower peripheral edge of the cylindrical guide portion provided at the lower portion of the peripheral wall of the second heat exchanger are provided so as to contact the first heat exchanger, the combustion gas is supplied to the second heat exchanger. It becomes easy to enter the inside of the cylindrical heat exchange member in the heat exchanger, heat exchange there increases, and heat exchange efficiency improves.
[0043]
According to the fifth aspect of the invention, the combustion burner, the first heat exchanger having a hollow cylindrical peripheral wall forming a combustion chamber at the upper portion of the burner, and the inner upper portion of the first heat exchanger are arranged. A second heat exchanger having a cylindrical peripheral wall, a peripheral surface forming a predetermined gap between the peripheral wall of the second heat exchanger, and a closed upper end surface from the combustion chamber A cylindrical heat exchange member mounted inside the second heat exchanger so as to introduce the combustion gas of the first heat exchanger, and between the upper peripheral wall of the first heat exchanger and the peripheral wall of the second heat exchanger In the hot water boiler having an exhaust gas path formed of a small gap formed in the hollow member, the hollow member that prevents the combustion gas from rising near the peripheral wall of the first heat exchanger and concentrates the combustion gas rising in the combustion chamber toward the central portion Since the combustion gas is provided in the cylindrical heat exchange member in the second heat exchanger, It makes it easier to enter the side, where the heat exchange is increased, and to improve the heat exchange efficiency.
[0044]
According to the sixth invention, since the diameter of the hollow portion of the hollow member is made smaller than the inner diameter of the cylindrical heat exchange member in the second heat exchanger, the combustion gas becomes the cylindrical heat in the second heat exchanger. It becomes easy to enter the inside of the exchange member, heat exchange there increases, and heat exchange efficiency is improved.
[0045]
According to the seventh aspect of the present invention, the combustion burner, the hollow cylindrical first heat exchanger that forms the combustion chamber in the upper portion of the burner, and the inner upper portion of the first heat exchanger are closed. A cylindrical second heat exchanger having an upper end surface, and a tubular red heat radiator disposed in the center of the combustion chamber and having a diameter smaller than that of the combustion burner, the first heat exchanger In a hot water boiler having an exhaust gas path composed of a small gap formed between the upper inner peripheral wall and the outer peripheral wall of the second heat exchanger, the combustion gas is prevented from rising near the peripheral wall of the first heat exchanger A hollow member that concentrates the combustion gas rising in the chamber toward the center is provided, making it easier for the combustion gas to enter the second heat exchanger, increasing heat exchange there and improving heat exchange efficiency To do.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a main part of a hot water boiler showing a first embodiment according to the present invention.
FIG. 2 is a cross-sectional view of a main part of a hot water boiler showing a second embodiment according to the present invention.
FIG. 3 is a cross-sectional view of a main part of a hot water boiler showing a third embodiment according to the present invention.
FIG. 4 is a cross-sectional view of a main part of a hot water boiler showing a fourth embodiment according to the present invention.
FIG. 5 is a cross-sectional view showing a conventional hot water boiler.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Burner unit, 2 Combustion chamber, 9 Return port, 10 Hot water outlet, 11 Inner cylinder, 11a Annular rib, 12 Outer cylinder, 12a Protrusion part, 13 Water wall layer, 14 Connection port, 15 1st heat exchanger , 16 2nd heat exchanger, 16a Heat exchange member, 16b Outer peripheral projection of second heat exchanger, 16c Outer peripheral projection of second heat exchanger, 16d Outer projection of second heat exchanger Tension part, 16e Outer peripheral projecting part of second heat exchanger, 16f Mounting part, 18 Connecting pipe, 19 Exhaust gas path, 20 Top plate, 22 Exhaust gas path, 23 Red heat radiator, 27 Hollow disk, 27a Hollow disk Hollow part.
