JP3790062B2 - Duct flow straightening plate and assembly method thereof - Google Patents

Duct flow straightening plate and assembly method thereof Download PDF

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Publication number
JP3790062B2
JP3790062B2 JP02806999A JP2806999A JP3790062B2 JP 3790062 B2 JP3790062 B2 JP 3790062B2 JP 02806999 A JP02806999 A JP 02806999A JP 2806999 A JP2806999 A JP 2806999A JP 3790062 B2 JP3790062 B2 JP 3790062B2
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Prior art keywords
rectifying
sound absorbing
absorbing material
rectification unit
duct
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JP2000227213A (en
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明 熊谷
力 柘植
大十 榊原
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Rinnai Corp
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Rinnai Corp
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Description

【0001】
【発明の属する技術分野】
本発明は、給湯器等の熱交換器の上部に連設された排気ダクト内に設けるダクト整流板及びその組立方法に関する。
【0002】
【従来の技術】
近年、屋外設置型の給湯器は、比較的狭いスペースに設置できるように、器具全体の小型化が要求され、同時に高い給湯能力を得ることも要求されている。そのため、小さな燃焼スペースで十分な燃焼量が得られるように、強制的に給気する燃焼装置が採用されている。一方、強制的に給気を行うことによって燃焼排気の流速が高くなり、燃焼運転時の排気音が騒音となる不都合がある。そのため、この種の給湯器においては、熱交換器の上端開口部に接続された排気ダクトの内部に、燃焼排気を屈曲させて排出方向に案内するダクト整流板を設け、燃焼排気が流動する際に生じる耳障りな高周波域の音を取り除くようにしたものが知られている。
【0003】
この種のダクト整流板は、例えば、実開平6−22743号公報に見られるように、前記熱交換器の上部に臨む板状の下方整流部と該下方整流部の後方部分を上方に円弧状に屈曲させて形成された屈曲整流部とからなる第1整流板と、該第1整流板と別体に形成され該第1整流板の屈曲整流部に接続することにより排気を前方の排出口に案内する板状の第2整流板とを備えている。そして、該排気ダクトの内部の所定位置に第1整流板と第2整流板とを取り付けることによって第1整流板と第2整流板とが連設され、燃焼排気を一旦後方に屈曲させた後に前方に屈曲させて前方に排出する排気経路を形成している。
【0004】
このように、ダクト整流板を設けて排気経路を屈曲させることにより、燃焼排気が流動する際の高周波域の音が抑えられ、排気の流動に伴う騒音を低減することができる。なお、ダクト整流板を設けて排気経路を屈曲させることによって、排気ダクトが小型化でき、排出口からの雨水の侵入が防止できるといった利点もある。
【0005】
また、給湯器のバーナへの着火時に一時的に燃焼排気圧が高くなると、燃焼排気が前記下方整流部に比較的強く衝突するために共鳴音が生じることがある。そのため、前記下方整流部に、該下方整流部を貫通するバーリング孔を形成して、小量の排気を該バーリング孔から排出させることにより、着火時の共鳴音を低減することが行われている。
【0006】
しかし、前記ダクト整流板によって燃焼排気を屈曲させる排気経路を形成しただけでは、耳障りな高周波域の排気音を抑えることが不充分であり、排気に伴う騒音を一層低減させることが望まれている。そこで、前記排気経路の内壁面に吸音材を貼着して設けることが考えられるが、この場合には排気経路を狭めることになり、円滑な排気の流動を阻害するおそれがある。
【0007】
また、ダクト整流板の内部(即ち、従来の構造によれば第1整流板と第2整流板との間)に吸音材を設け、該吸音材に対応する位置の該下方整流部に該吸音材を露出させるための開放部を設けて、該吸音材により燃焼排気が流動する際に生じる騒音を抑えることが考えられる。しかし、第1整流板と第2整流板とが別体に構成されたダクト整流板の内部に吸音材を設けるためには、該吸音材をダクト整流板の内部に吸音材を固定するための部材が別途必要となるために部品点数が増加してコストが増加する不都合がある。それだけでなく、第1整流板と第2整流板との組付けと同時に吸音材の取り付け作業を行わなければならないために、吸音材の取付作業が煩わしく、作業効率が低下する不都合がある。
【0008】
【発明が解決しようとする課題】
かかる不都合を解消して、本発明は、排気に伴う騒音を十分に低減することができる構造簡単なダクト整流板を提供することを目的とし、また、ダクト整流板の内部への吸音材の取付作業を極めて容易に行うことができるダクト整流板の組立方法を提供することを目的とする。
【0009】
【課題を解決するための手段】
かかる目的を達成するために、本発明は、熱交換器の上端開口部に被冠されて該熱交換器を経て上昇する燃焼排気を前方に形成された排出口から排出する排気ダクトに設けられ、該排気ダクトの内部において前記熱交換器を経て上昇する燃焼排気を、一旦後方に屈曲させた後に前方に屈曲させて前記排出口へ案内する排気経路を形成するダクト整流板において、略矩形状の金属板材をその略中央部から円弧状に屈曲させて折り返すことにより、前記熱交換器の上端開口部に臨んで排気を後方に案内する下方整流部と、該下方整流部に連続して該下方整流部に案内された排気を上方に案内しつつ前方に屈曲させる屈曲整流部と、該屈曲整流部に連続して該屈曲整流部に案内された排気を前記排出口に案内する上方整流部とが形成され、更に、前記下方整流部の前方の端部と前記上方整流部の前方の端部とが間隙を存して対向されてなり、前記下方整流部の所定位置に貫通する開放部を設け、前記下方整流部の前方の端部と前記上方整流部の前方の端部との間隙を介して該下方整流部と該上方整流部との間に挿入されて前記開放部を閉塞する吸音材を設け、該吸音材は、前記下方整流部と前記上方整流部との互いに接近する方向への弾性力により該下方整流部と該上方整流部との間に圧接挟持されることを特徴とする。
【0010】
本発明によれば、前記吸音材を前記開放部から露出するようにダクト整流板の下部整流部と上部整流部との間に設けたので、排気経路を狭めることなく吸音材を設けることができ、該吸音材は、開放部から露出して排気の流動に生じる音を吸収するので、十分に騒音の発生を防止することができる。
【0011】
該吸音材は、ダクト整流板の下部整流部と上部整流部とにより、弾発的に押さえつけられているので、従来のように吸音材をダクト整流板の内部に固定する部材を設けなくても、確実に固定することができ、部品点数を増加させることなく安価に形成することができる。
【0012】
また、吸音材は、下部整流部と上部整流部との復元弾性によって弾発的に押さえつけられているので、開放部を介して燃焼排気が比較的強く衝突しても、吸音材が開放部から持ち上げられることがなく開放部を確実に閉塞した状態を維持して高い吸音効果を得ることができる。
【0013】
また、前記下方整流部の前記吸音材との当接位置には、該吸音材に挿入して該吸音材を移動不能に係止する係止爪が形成されていることが好ましい。これにより、吸音材の前後左右方向の位置ズレを防止することができ、下部整流部と上部整流部との間からの吸音材の抜け出しを確実に防止することができる。
【0014】
また、本発明は、前記ダクト整流板の組立方法において、略矩形状の金属板材の前側半部に該板材を貫通する開放部を設けて下方整流部を形成し、該板材の略中央部を上方に向かって円弧状に屈曲させて屈曲整流部を形成すると同時に、該板材の後側半部を前記下方整流部の上方側に折り返して該下方整流部に前方から後方にわたり間隔を存して対向する上方整流部を形成する折り返し工程と、前記下方整流部と前記上方整流部とを弾発的に離反させて、その前方に形成された下方整流部と上方整流部との間隙から前記吸音材を前記下方整流部と前記上方整流部との間に挿入し、前記下方整流部と前記上方整流部とが互いに接近する方向に有する復元弾性により該吸音材を前記下方整流部と前記上方整流部との間の前記開放部を閉塞する位置に圧接挟持させる吸音材挿入工程とを備えることを特徴とする。
【0015】
本発明によれば、前記折り返し工程によって略矩形状の金属板材から下方整流部、屈曲整流部、及び上方整流部を形成して前記ダクト整流板を得ることができる。これにより、下方整流部から上方整流部を持ち上げるように離反させた場合に、上方整流部と下方整流部とが互いに接近しようとする復元弾性を得ることができ、上方整流部と下方整流部との間隔を一定に保持することができる。
【0016】
そして、前記吸音材挿入工程により、下方整流部と上方整流部とを弾発的に離反させて吸音材を挿入するといった極めて簡単な作業だけで、下方整流部と上方整流部との間に容易に吸音材を挿入することができる。しかも、下方整流部からの上方整流部の離反状態を解除したときには、上方整流部と下方整流部とが互いに接近しようとする復元弾性によって吸音材が押さえつけられ、上方整流部と下方整流部との間への吸音材の保持状態が確実に維持される。
【0017】
また、前記下方整流部の前端縁と前記開放部との間には、内周縁が上方に突出するバーリング孔が形成されており、前記吸音材挿入工程においては、前記吸音材を内方に案内する板状の吸音材案内治具を、前記バーリング孔の上端に当接して前記下方整流部を押さえ、該吸音材案内治具により前記下方整流部を押さえた状態で前記上方整流部を弾発的に上方に引き上げて該上方整流部を前記下方整流部から離反させ、前記吸音材を該吸音材案内治具に沿って前記下方整流部と前記上方整流部との間の前記開放部を閉塞する位置に挿入することを特徴とする。
【0018】
着火時の共鳴音を防止するために前記バーリング孔が設けられており、該バーリング孔からの雨水の侵入を防止するために、該バーリング孔が下方整流部の上方に突出して形成されている場合には、下方整流部と上方整流部との間に吸音材を挿入するときに、該吸音材がバーリング孔に引っかかり、円滑な挿入作業が望めないおそれがある。そこで本発明によれば、吸音材案内治具を使用することによって、バーリング孔の上端に当接して平坦な吸音材の案内路を形成するので、該吸音材を円滑に挿入することができる。また、上方整流部を下方整流部から上方に離反させる際に吸音材案内治具によって下方整流部を押さえておくことができるので、該吸音材の挿入作業を容易に行うことができる。
【0019】
また、前記吸音材挿入工程において前記下方整流部と前記上方整流部との間に前記吸音材を挿入するとき、シート状の前記吸音材を略中央部から折り返して板状の挿入具の先端部に保持させ、該挿入具を前記下方整流部と前記上方整流部との間に挿入することにより吸音材を前記開放部を閉塞する位置に押し込むことを特徴とする。
【0020】
例えば、前記吸音材として、グラスファイバー製マットを採用することが考えられるが、この種の吸音材は、比較的柔らかく、前記下方整流部と前記上方整流部との間に挿入しずらい場合がある。この場合には、前記挿入具の先端部に、吸音材を二つ折りして保持させ、該挿入具を下方整流部と上方整流部との間に押し込むだけで、容易に吸音材の挿入作業を行うことができる。
【0021】
【発明の実施の形態】
本発明の一実施形態を図面に基づいて説明する。図1は本実施形態の排気ダクトを示す縦断面説明図、図2はダクト本体を示す説明的斜視図、図3はダクト整流板の底面図、図4(a)及び(b)はダクト整流板の折り返し工程を示す説明図、図5(a)乃至(c)は吸音材挿入工程を示す説明図である。
【0022】
本実施形態の排気ダクト1は、図1に示すように、給湯器の熱交換器2の上端開口部3に被冠されている。熱交換器2は、図示しないガスバーナ等の燃焼装置の上部に連設されており、排気ダクト1は、熱交換器2を経て上昇する燃焼排気を排出する。
【0023】
該排気ダクト1は、前方に排出口4が形成されたダクト本体5と、該ダクト本体5の内部において燃焼排気を排出口4へ案内する排気経路を形成するダクト整流板6とにより構成されている。
【0024】
該ダクト本体5は、図1及び図2に示すように、互いに対向して起立する両側板7と、両側板7の後側縁に連設された後側板8と、上部を閉塞する天板9と、熱交換器2に連結する連結枠部10とを備えている。両側板7の前側縁及び天板9の前側縁は開放する前記排出口4を形成している。該ダクト本体5の両側板7の内面側には、前記ダクト整流板6の両端縁部がネジxにより連結されており、図2中破線示するように、該ダクト整流板6はダクト本体5の内部に固定されている。
【0025】
該ダクト整流板6は、図1に示すように、前記熱交換器2の上端開口部3に臨んで排気を後方に案内する下方整流部11と、該下方整流部の後方に案内された排気を上方に案内しつつ前方に屈曲させる屈曲整流部12と、該屈曲整流部に案内された排気を前記排出口4に案内する上方整流部13とを備えている。該ダクト整流板6は、図1及び図2に示すように、後述する金属製板材wを折り曲げることによって形成されており、これによって下方整流部11、屈曲整流部12、及び上方整流部13が一体に連続して形成されている。前記下方整流部11には、図3に示すように、その前端部に複数のバーリング孔14が形成されている。該バーリング孔14は、ガスバーナの着火時に小量の排気を排出させて共鳴音を低減するものである。該バーリング孔14は、図1に示すように、内周縁が上方に突出するように形成されており、排気ダクト1の前記排出口4から内部に雨水が侵入することを防止している。
【0026】
前記下方整流部11の該バーリング孔14と前記屈曲整流部12との間には、図3に示すように、該下方整流部11を方形状に貫通する複数の開放部15が形成されている。該開放部15を閉塞する位置における前記下方整流部11と前記上方整流部13との間には、図1に示すように、吸音材16(本実施形態においてはグラスファイバーマットを採用した)が設けられている。該吸音材16は、図3に示すように、開放部15を介して前記下方整流部11の下方に露出され、排気の流動時に生じる音を吸収して騒音の発生を防止する。該吸音材16は、図1に示すように、前記下方整流部11と前記上方整流部13とが互いに接近する方向に有する弾性力により前記下方整流部11と前記上方整流部13とに圧接挟持されている。前記下方整流部11と前記上方整流部13とは一枚の金属製板材wを折り曲げることによって形成されているので、前記下方整流部11と前記上方整流部13との間隔寸法よりも厚みのある吸音材16を設けることにより、前記下方整流部11と前記上方整流部13とに弾発的に挟持させることができ、例えば、吸音材16を固定するための部材等を用いることなく、確実に前記下方整流部11上に固定することができる。なお、本実施形態においては、吸音材16であるグラスファイバーマットを二つ折りにすることによって吸音材16の厚みを比較的厚く形成して、前記下方整流部11と前記上方整流部13とによる挟持を確実としたが、吸音材16の厚みが十分に得られる場合には、二つ折りにすることなく平坦な状態で設けてもよい。また、それ以外には、吸音材16であるグラスファイバーマットを複数枚に重ねて、前記下方整流部11と前記上方整流部13との間に設けてもよい。
【0027】
更に、前記下方整流部11と前記上方整流部13とに挟持された吸音材16は、図1に示すように、前記下方整流部11の上方に突出して設けられた係止爪17に係止され、前後左右方向に移動不能とされている。該係止爪17は、前記開放部15を打ち抜いて形成する際に切り残し部分を起立方向に折り曲げて形成されており、吸音材16に食い込んで係止するようになっている。
【0028】
また、図1及び図2に示すように、前記下方整流部11の両側縁には前記ダクト本体5の両側板7にネジ止め連結するためのネジ孔を有する連結壁18が形成されており、前記上方整流部13の両側縁には前記ダクト本体5の両側板7にネジ止め連結するためのネジ孔を有する連結片19が形成されている。更に、図2及び図3に示すように、前記下方整流部11の周囲には、ダクト本体5と熱交換器2との間に挟持されて連結される連結枠部20が形成されている。
【0029】
次に、前記ダクト整流板6の組立方法を説明する。本実施形態のダクト整流板6は、図4(a)及び(b)に示すように略矩形状の金属板材wの一方半部の上方側に他方半部を折り返す折り返し工程と、図5(a)乃至(c)に示すように下方整流部11と前記上方整流部13との間に前記吸音材16を挿入する吸音材挿入工程とを行うことによって形成される。
【0030】
先ず、図4(a)及び(b)を参照して前記折り返し工程を説明する。図4(a)に示すように、前記板材wには、予めプレス成形等を施すことによって前記下方整流部11とされる部位に前記バーリング孔14、開放部15、係止爪17、連結壁18、及び連結枠部20が形成されている。屈曲整流部12と上方整流部13とは前記下方整流部11の後端縁に連続して平板状に連なっている。上方整流部13を形成する部位の両端部には、前記連結片19が打ち抜き形成されており、該連結片19は、上方整流部13の両端部に起立する方向に予め折り曲げられている。
【0031】
そして、図4(a)示の下方整流部11に平板状に連なる該板材wの略中央部(屈曲整流部12を形成する部位)を、図4(b)に示すように上方向に円弧状に折り曲げ、該板材の後側半部(上方整流部13を形成する部位)を下方整流部11の上方に折り返す。これにより、下方整流部11、屈曲整流部12、及び上方整流部13が形成される。このように、下方整流部11、屈曲整流部12、及び上方整流部13を前記単一の板材wから形成することにより、下方整流部11から上方整流部13を持ち上げるように離反させたときに、上方整流部13が下方整流部11に向かって接近する方向に戻ろうとする弾力(スプリングバック)が生じ、上方整流部13と下方整流部11との間隔を一定に保持することができる。
【0032】
次に、図5(a)乃至(c)を参照して前記吸音材挿入工程を説明する。図5(a)に示すように、ダクト整流板6の下方整流部11と上方整流部13との間に前方から吸音材案内治具21を挿入して下方整流部11を所定位置に保持し、上方整流部13を手作業等によって上方に引き開いて下方整流部11から離反させる。該吸音材案内治具21は基部22と該基部22に固定された案内板23とによって構成されており、下方整流部11と上方整流部13との間には該案内板22が挿入される。該案内板22は下方整流部11の上部に突出する前記バーリング孔14の上端縁に当接し、該バーリング孔14上に平滑な案内路を形成する。
【0033】
次いで、図5(b)に示すように、開かれた下方整流部11と上方整流部13との間に吸音材16を挿入する。該吸音材16は、挿入具24の先端部に二つ折りの状態で保持され、該挿入具24を押し込むことにより、吸音材16を挿入する。該吸音材16は、前記吸音材案内治具21の案内板23に沿って円滑にダクト整流板6の内部に押し入れられ、開放部15を閉塞する位置に挿入される。開放部15を閉塞する位置に挿入された吸音材16は、係止爪17に係止され、前後左右方向に移動自在とされる。
【0034】
その後、図5(c)に示すように、吸音材案内治具21と挿入具24とを取り外し、下方整流部11からの上方整流部13の離反を解除する。これにより、上方整流部13が下方整流部11に向かってスプリングバックによって弾発的に戻り、吸音材16を下方整流部11に向かって押さえつける。これにより、吸音材16を固定することができる。
【図面の簡単な説明】
【図1】本発明の一実施形態の排気ダクトを示す縦断面説明図。
【図2】ダクト本体を示す説明的斜視図。
【図3】ダクト整流板の底面図。
【図4】ダクト整流板の折り返し工程を示す説明図。
【図5】吸音材挿入工程を示す説明図。
【符号の説明】
1…排気ダクト、2…熱交換器、3…上端開口部、4…排出口、6…ダクト整流板、11…下方整流部、12…屈曲整流部、13…上方整流部、14…バーリング孔、15…開放部、16…吸音材、17…係止爪、21…吸音材案内治具、24…挿入具、w…板材。
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a duct rectifying plate provided in an exhaust duct connected to an upper portion of a heat exchanger such as a water heater and an assembling method thereof.
[0002]
[Prior art]
In recent years, outdoor installation type water heaters are required to be downsized as a whole so that they can be installed in a relatively narrow space, and at the same time, it is also required to obtain a high hot water supply capacity. Therefore, a combustion apparatus that forcibly supplies air is employed so that a sufficient combustion amount can be obtained in a small combustion space. On the other hand, forcibly supplying the air increases the flow velocity of the combustion exhaust, and there is a disadvantage that the exhaust sound during the combustion operation becomes a noise. For this reason, in this type of water heater, a duct rectifying plate is provided inside the exhaust duct connected to the upper end opening of the heat exchanger to guide the combustion exhaust in the exhaust direction, and the combustion exhaust flows. It is known to remove the annoying high-frequency sound that occurs in
[0003]
This type of duct rectifying plate is, for example, a plate-like lower rectifying portion facing the upper portion of the heat exchanger and a rear portion of the lower rectifying portion in an arc shape upward as seen in Japanese Utility Model Laid-Open No. 6-22743. A first rectifying plate formed of a bent rectifying portion formed by bending the first rectifying plate, and an exhaust outlet disposed in front of the first rectifying plate and connected to the bent rectifying portion of the first rectifying plate. And a plate-like second rectifying plate that guides the Then, the first rectifying plate and the second rectifying plate are connected by attaching the first rectifying plate and the second rectifying plate to a predetermined position inside the exhaust duct, and the combustion exhaust is bent backward once. An exhaust path that is bent forward and discharged forward is formed.
[0004]
As described above, by providing the duct baffle plate and bending the exhaust path, the noise in the high frequency region when the combustion exhaust gas flows is suppressed, and the noise accompanying the flow of the exhaust gas can be reduced. In addition, by providing the duct baffle plate and bending the exhaust path, there is an advantage that the exhaust duct can be miniaturized and rainwater can be prevented from entering from the discharge port.
[0005]
Further, if the combustion exhaust pressure temporarily rises during ignition of the water heater, the combustion exhaust may collide relatively strongly with the lower rectification unit, and a resonance noise may be generated. Therefore, by forming a burring hole penetrating the lower rectification portion in the lower rectification portion and discharging a small amount of exhaust from the burring hole, the resonance noise during ignition is reduced. .
[0006]
However, it is insufficient to suppress exhaust noise in an unpleasant high frequency range simply by forming an exhaust path that bends combustion exhaust by the duct rectifying plate, and it is desired to further reduce noise associated with exhaust. . Therefore, it is conceivable to provide a sound absorbing material on the inner wall surface of the exhaust path, but in this case, the exhaust path is narrowed, and smooth exhaust flow may be hindered.
[0007]
Also, a sound absorbing material is provided inside the duct rectifying plate (that is, between the first rectifying plate and the second rectifying plate according to the conventional structure), and the sound absorbing material is disposed at the lower rectifying portion at a position corresponding to the sound absorbing material. It is conceivable to provide an open portion for exposing the material to suppress noise generated when the combustion exhaust gas flows by the sound absorbing material. However, in order to provide the sound absorbing material inside the duct rectifying plate in which the first rectifying plate and the second rectifying plate are configured separately, the sound absorbing material is used to fix the sound absorbing material inside the duct rectifying plate. Since members are required separately, there is a disadvantage that the number of parts increases and the cost increases. In addition, the sound absorbing material must be attached simultaneously with the assembly of the first rectifying plate and the second rectifying plate, so that the attaching operation of the sound absorbing material is troublesome and the work efficiency is reduced.
[0008]
[Problems to be solved by the invention]
An object of the present invention, which eliminates such disadvantages, is to provide a duct rectifying plate having a simple structure capable of sufficiently reducing noise caused by exhaust, and mounting of a sound absorbing material inside the duct rectifying plate. It is an object of the present invention to provide a method for assembling a duct rectifying plate capable of performing work very easily.
[0009]
[Means for Solving the Problems]
In order to achieve this object, the present invention is provided in an exhaust duct that exhausts combustion exhaust that is covered by an upper end opening of a heat exchanger and rises through the heat exchanger from a discharge port formed forward. In the duct rectifying plate that forms an exhaust path for guiding the combustion exhaust rising through the heat exchanger inside the exhaust duct once bent backward and then bent forward, to the exhaust port, The metal plate material is bent in a circular arc shape from its substantially central portion and turned back, thereby facing the upper end opening of the heat exchanger, and a lower rectification portion that guides the exhaust gas backward, and the lower rectification portion continuous with the lower rectification portion. A bending rectification unit that bends the exhaust guided to the lower rectification unit upward while guiding it upward, and an upper rectification unit that guides the exhaust guided to the bending rectification unit to the discharge port continuously from the bending rectification unit : it is formed, further, before It is opposed to presence of the front end and the gap between the upper rectifying part and the front end of the lower rectifying section, provided an opening penetrating in the predetermined position of the lower rectifying section, of the lower rectifying section A sound absorbing material that is inserted between the lower rectifying portion and the upper rectifying portion through a gap between a front end portion and a front end portion of the upper rectifying portion to close the open portion; Is characterized in that the lower rectification unit and the upper rectification unit are pressed and clamped between the lower rectification unit and the upper rectification unit by an elastic force in a direction approaching each other .
[0010]
According to the present invention, since the sound absorbing material is provided between the lower rectifying portion and the upper rectifying portion of the duct rectifying plate so as to be exposed from the open portion, the sound absorbing material can be provided without narrowing the exhaust path. Since the sound absorbing material absorbs the sound that is exposed from the open portion and is generated in the flow of the exhaust gas, the generation of noise can be sufficiently prevented.
[0011]
Since the sound absorbing material is elastically pressed by the lower rectifying portion and the upper rectifying portion of the duct rectifying plate, there is no need to provide a member for fixing the sound absorbing material inside the duct rectifying plate as in the prior art. It can be securely fixed and can be formed at low cost without increasing the number of parts.
[0012]
Further, since the sound absorbing material is elastically pressed by the restoring elasticity of the lower rectifying portion and the upper rectifying portion, even if the combustion exhaust collides relatively strongly through the opening portion, the sound absorbing material is removed from the opening portion. A high sound-absorbing effect can be obtained while maintaining the state where the open portion is reliably closed without being lifted.
[0013]
In addition, it is preferable that a locking claw that is inserted into the sound absorbing material and locks the sound absorbing material so as to be immovable is formed at a position where the lower rectifying portion contacts the sound absorbing material. Thereby, position shift of the sound absorbing material in the front-rear and left-right directions can be prevented, and the sound absorbing material can be reliably prevented from coming out from between the lower rectifying unit and the upper rectifying unit.
[0014]
Further, the present invention provides the duct rectifying plate assembling method, wherein an open portion that penetrates the plate material is provided in the front half of the substantially rectangular metal plate material to form a lower rectifying portion, and a substantially central portion of the plate material is formed. At the same time as forming a bent rectification part by bending in an arc shape upward, the rear half of the plate member is folded back to the upper side of the lower rectification part, and the lower rectification part is spaced from the front to the rear. The sound-absorbing step is formed by a folding step of forming an opposing upper rectification unit, and the lower rectification unit and the upper rectification unit are elastically separated from each other and a gap between the lower rectification unit and the upper rectification unit formed in front thereof. A material is inserted between the lower rectification unit and the upper rectification unit, and the sound absorbing material is restored to the lower rectification unit and the upper rectification by a restoring elasticity that the lower rectification unit and the upper rectification unit have in the direction of approaching each other. Position for closing the open part between the parts Characterized in that it comprises a sound absorbing material insert step of nipped.
[0015]
According to the present invention, the duct rectification plate can be obtained by forming the lower rectification portion, the bending rectification portion, and the upper rectification portion from the substantially rectangular metal plate material by the folding step. Thus, when the upper rectification unit is lifted away from the lower rectification unit, it is possible to obtain restoring elasticity that the upper rectification unit and the lower rectification unit approach each other. Can be kept constant.
[0016]
And, by the sound absorbing material insertion step, the lower rectifying portion and the upper rectifying portion can be easily separated between the lower rectifying portion and the upper rectifying portion only by inserting the sound absorbing material by elastically separating the lower rectifying portion and the upper rectifying portion. Sound absorbing material can be inserted into the. Moreover, when the separation of the upper rectification unit from the lower rectification unit is released, the sound absorbing material is pressed by the restoring elasticity that the upper rectification unit and the lower rectification unit approach each other, and the upper rectification unit and the lower rectification unit The holding state of the sound absorbing material in between is reliably maintained.
[0017]
Further, a burring hole is formed between the front edge of the lower rectifying portion and the open portion, and an inner peripheral edge projects upward. In the sound absorbing material inserting step, the sound absorbing material is guided inward. A plate-like sound absorbing material guide jig that is in contact with the upper end of the burring hole to hold down the lower rectifying portion, and with the sound absorbing material guide jig to hold down the lower rectifying portion, The upper rectifying unit is separated from the lower rectifying unit by pulling upward, and the sound absorbing material is closed along the sound absorbing material guide jig to close the open portion between the lower rectifying unit and the upper rectifying unit. It inserts in the position to do.
[0018]
The burring hole is provided in order to prevent resonance noise during ignition, and the burring hole is formed to protrude above the lower rectification unit in order to prevent intrusion of rainwater from the burring hole When the sound absorbing material is inserted between the lower rectifying unit and the upper rectifying unit, the sound absorbing material may be caught in the burring hole, and a smooth insertion operation may not be expected. Therefore, according to the present invention, by using the sound absorbing material guide jig, a flat sound absorbing material guide path is formed in contact with the upper end of the burring hole, so that the sound absorbing material can be smoothly inserted. In addition, since the lower rectification unit can be pressed by the sound absorbing material guide jig when the upper rectification unit is moved away from the lower rectification unit, the sound absorbing material can be inserted easily.
[0019]
Further, when the sound absorbing material is inserted between the lower rectifying portion and the upper rectifying portion in the sound absorbing material inserting step, the sheet-like sound absorbing material is folded back from a substantially central portion, and the tip portion of the plate-shaped insertion tool The sound absorbing material is pushed into a position where the opening portion is closed by inserting the insertion tool between the lower rectifying portion and the upper rectifying portion.
[0020]
For example, it is conceivable to employ a glass fiber mat as the sound absorbing material. However, this type of sound absorbing material may be relatively soft and difficult to insert between the lower rectifying unit and the upper rectifying unit. is there. In this case, the sound absorbing material is folded and held at the tip of the insertion tool, and the insertion tool is easily inserted between the lower rectification unit and the upper rectification unit by simply inserting the insertion tool. It can be carried out.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view showing an exhaust duct of the present embodiment, FIG. 2 is an explanatory perspective view showing a duct body, FIG. 3 is a bottom view of a duct rectifying plate, and FIGS. 4 (a) and 4 (b) are duct rectifications. FIG. 5A to FIG. 5C are explanatory views showing a sound absorbing material inserting step.
[0022]
As shown in FIG. 1, the exhaust duct 1 of the present embodiment is covered with an upper end opening 3 of a heat exchanger 2 of a water heater. The heat exchanger 2 is connected to an upper portion of a combustion apparatus such as a gas burner (not shown), and the exhaust duct 1 discharges combustion exhaust that rises through the heat exchanger 2.
[0023]
The exhaust duct 1 includes a duct body 5 having a discharge port 4 formed in front thereof, and a duct rectifying plate 6 that forms an exhaust path for guiding combustion exhaust to the discharge port 4 inside the duct body 5. Yes.
[0024]
As shown in FIGS. 1 and 2, the duct body 5 includes both side plates 7 that stand opposite to each other, a rear side plate 8 that is connected to the rear edge of the side plates 7, and a top plate that closes the top. 9 and a connecting frame portion 10 connected to the heat exchanger 2. The front side edge of the side plates 7 and the front side edge of the top plate 9 form the discharge port 4 that opens. Both end edges of the duct rectifying plate 6 are connected to the inner surface side of the both side plates 7 of the duct main body 5 by screws x, and the duct rectifying plate 6 is connected to the duct main body 5 as shown by a broken line in FIG. It is fixed inside.
[0025]
As shown in FIG. 1, the duct rectifying plate 6 includes a lower rectifying unit 11 that guides exhaust toward the upper end opening 3 of the heat exchanger 2, and an exhaust guided behind the lower rectifying unit. Is provided with a bending rectification unit 12 that bends forward while guiding the gas upward, and an upper rectification unit 13 that guides the exhaust gas guided by the bending rectification unit to the discharge port 4. As shown in FIGS. 1 and 2, the duct rectifying plate 6 is formed by bending a metal plate material w, which will be described later, whereby the lower rectifying unit 11, the bent rectifying unit 12, and the upper rectifying unit 13 are formed. It is integrally formed continuously. As shown in FIG. 3, the lower rectifying unit 11 has a plurality of burring holes 14 formed at the front end thereof. The burring hole 14 discharges a small amount of exhaust when the gas burner is ignited to reduce resonance noise. As shown in FIG. 1, the burring hole 14 is formed so that the inner peripheral edge protrudes upward, and prevents rainwater from entering the inside through the discharge port 4 of the exhaust duct 1.
[0026]
Between the burring hole 14 of the lower rectification unit 11 and the bent rectification unit 12, a plurality of open portions 15 penetrating the lower rectification unit 11 in a rectangular shape are formed as shown in FIG. . Between the lower rectification unit 11 and the upper rectification unit 13 at a position where the open portion 15 is closed, as shown in FIG. 1, a sound absorbing material 16 (a glass fiber mat is adopted in the present embodiment) is provided. Is provided. As shown in FIG. 3, the sound absorbing material 16 is exposed below the lower rectifying unit 11 through the opening 15, and absorbs sound generated when the exhaust gas flows to prevent generation of noise. As shown in FIG. 1, the sound absorbing material 16 is pressed and clamped between the lower rectifying unit 11 and the upper rectifying unit 13 by the elastic force that the lower rectifying unit 11 and the upper rectifying unit 13 have in the direction in which they approach each other. Has been. Since the lower rectification unit 11 and the upper rectification unit 13 are formed by bending a single metal plate material w, the lower rectification unit 11 and the upper rectification unit 13 are thicker than the distance between the lower rectification unit 11 and the upper rectification unit 13. By providing the sound absorbing material 16, the lower rectifying unit 11 and the upper rectifying unit 13 can be elastically sandwiched, for example, without using a member for fixing the sound absorbing material 16 or the like. It can be fixed on the lower rectifying unit 11. In this embodiment, the sound absorbing material 16 is formed to be relatively thick by folding the glass fiber mat that is the sound absorbing material 16 in half, and is sandwiched between the lower rectifying unit 11 and the upper rectifying unit 13. However, when the sound absorbing material 16 has a sufficient thickness, it may be provided in a flat state without being folded in half. In addition, a plurality of glass fiber mats as the sound absorbing material 16 may be stacked and provided between the lower rectifying unit 11 and the upper rectifying unit 13.
[0027]
Further, the sound absorbing material 16 sandwiched between the lower rectifying unit 11 and the upper rectifying unit 13 is engaged with an engaging claw 17 provided so as to protrude above the lower rectifying unit 11 as shown in FIG. It is impossible to move in the front-rear and left-right directions. The locking claw 17 is formed by bending the uncut portion when the open portion 15 is formed by punching in the upright direction, and bites into the sound absorbing material 16 to be locked.
[0028]
Further, as shown in FIGS. 1 and 2, connecting walls 18 having screw holes for screwing and connecting to both side plates 7 of the duct body 5 are formed on both side edges of the lower rectifying unit 11. Connection pieces 19 having screw holes for screwing and connecting to both side plates 7 of the duct body 5 are formed on both side edges of the upper rectifying unit 13. Further, as shown in FIGS. 2 and 3, a connecting frame portion 20 is formed around the lower rectifying portion 11 so as to be sandwiched and connected between the duct body 5 and the heat exchanger 2.
[0029]
Next, a method for assembling the duct rectifying plate 6 will be described. As shown in FIGS. 4 (a) and 4 (b), the duct rectifying plate 6 according to the present embodiment has a folding process in which the other half is folded back to the upper side of one half of the substantially rectangular metal plate material w, and FIG. As shown to a) thru | or (c), it forms by performing the sound absorption material insertion process which inserts the said sound absorption material 16 between the lower rectification | straightening part 11 and the said upper rectification | straightening part 13.
[0030]
First, the folding process will be described with reference to FIGS. 4 (a) and 4 (b). As shown in FIG. 4 (a), the plate material w is preliminarily formed by press molding or the like so that the burring hole 14, the open portion 15, the locking claw 17, and the connecting wall 18 and a connecting frame portion 20 are formed. The bending rectification unit 12 and the upper rectification unit 13 are connected to the rear end edge of the lower rectification unit 11 in a flat plate shape. The connecting piece 19 is punched and formed at both end portions of the portion forming the upper rectifying portion 13, and the connecting piece 19 is bent in advance in a direction to stand at both end portions of the upper rectifying portion 13.
[0031]
Then, a substantially central portion of the plate material w connected to the lower rectifying portion 11 shown in FIG. 4A (a portion where the bent rectifying portion 12 is formed) is circled upward as shown in FIG. 4B. The sheet material is bent in an arc shape, and the rear half of the plate member (the portion that forms the upper rectification unit 13) is folded back above the lower rectification unit 11. Thereby, the lower rectification part 11, the bending rectification part 12, and the upper rectification part 13 are formed. In this way, when the lower rectification unit 11, the bending rectification unit 12, and the upper rectification unit 13 are formed from the single plate material w, the upper rectification unit 13 is lifted away from the lower rectification unit 11 The elasticity (spring back) that the upper rectification unit 13 returns to the direction toward the lower rectification unit 11 is generated, and the distance between the upper rectification unit 13 and the lower rectification unit 11 can be kept constant.
[0032]
Next, the sound absorbing material inserting step will be described with reference to FIGS. As shown in FIG. 5A, a sound absorbing material guide jig 21 is inserted from the front between the lower rectifying portion 11 and the upper rectifying portion 13 of the duct rectifying plate 6 to hold the lower rectifying portion 11 in a predetermined position. Then, the upper rectification unit 13 is opened upward by manual work or the like to be separated from the lower rectification unit 11. The sound absorbing material guide jig 21 includes a base 22 and a guide plate 23 fixed to the base 22, and the guide plate 22 is inserted between the lower rectifying unit 11 and the upper rectifying unit 13. . The guide plate 22 abuts on the upper end edge of the burring hole 14 protruding above the lower rectifying unit 11 and forms a smooth guide path on the burring hole 14.
[0033]
Next, as shown in FIG. 5B, the sound absorbing material 16 is inserted between the opened lower rectification unit 11 and the upper rectification unit 13. The sound absorbing material 16 is held in a folded state at the distal end portion of the insertion tool 24, and the sound absorbing material 16 is inserted by pushing the insertion tool 24. The sound absorbing material 16 is smoothly pushed into the duct rectifying plate 6 along the guide plate 23 of the sound absorbing material guiding jig 21 and is inserted at a position where the opening 15 is closed. The sound absorbing material 16 inserted at the position where the opening 15 is closed is locked by the locking claw 17 and is movable in the front-rear and left-right directions.
[0034]
Thereafter, as shown in FIG. 5C, the sound absorbing material guide jig 21 and the insertion tool 24 are removed, and the separation of the upper rectification unit 13 from the lower rectification unit 11 is released. Thereby, the upper rectification part 13 returns elastically by the spring back toward the lower rectification part 11, and presses the sound absorbing material 16 toward the lower rectification part 11. Thereby, the sound absorbing material 16 can be fixed.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view illustrating an exhaust duct according to an embodiment of the present invention.
FIG. 2 is an explanatory perspective view showing a duct body.
FIG. 3 is a bottom view of a duct baffle plate.
FIG. 4 is an explanatory view showing a duct rectifying plate folding step.
FIG. 5 is an explanatory view showing a sound absorbing material inserting step.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Exhaust duct, 2 ... Heat exchanger, 3 ... Upper end opening part, 4 ... Discharge port, 6 ... Duct rectification plate, 11 ... Lower rectification part, 12 ... Bending rectification part, 13 ... Upper rectification part, 14 ... Burring hole 15 ... Opening part, 16 ... Sound absorbing material, 17 ... Locking claw, 21 ... Sound absorbing material guide jig, 24 ... Insertion tool, w ... Plate material.

Claims (5)

熱交換器の上端開口部に被冠されて該熱交換器を経て上昇する燃焼排気を前方に形成された排出口から排出する排気ダクトに設けられ、該排気ダクトの内部において前記熱交換器を経て上昇する燃焼排気を、一旦後方に屈曲させた後に前方に屈曲させて前記排出口へ案内する排気経路を形成するダクト整流板において、
略矩形状の金属板材をその略中央部から円弧状に屈曲させて折り返すことにより、前記熱交換器の上端開口部に臨んで排気を後方に案内する下方整流部と、該下方整流部に連続して該下方整流部に案内された排気を上方に案内しつつ前方に屈曲させる屈曲整流部と、該屈曲整流部に連続して該屈曲整流部に案内された排気を前記排出口に案内する上方整流部とが形成され、更に、前記下方整流部の前方の端部と前記上方整流部の前方の端部とが間隙を存して対向されてなり、
前記下方整流部の所定位置に貫通する開放部を設け、
前記下方整流部の前方の端部と前記上方整流部の前方の端部との間隙を介して該下方整流部と該上方整流部との間に挿入されて前記開放部を閉塞する吸音材を設け、
該吸音材は、前記下方整流部と前記上方整流部との互いに接近する方向への弾性力により該下方整流部と該上方整流部との間に圧接挟持されることを特徴とするダクト整流板。
An exhaust duct that is covered with the upper end opening of the heat exchanger and rises through the heat exchanger is provided in an exhaust duct that discharges through a discharge port formed forward, and the heat exchanger is disposed inside the exhaust duct. In the duct rectifying plate that forms the exhaust path that guides the exhaust gas that rises through the exhaust gas that is bent backward and then forward to the exhaust port,
A substantially rectangular metal plate is bent from an approximately central portion in an arc shape and folded back, thereby facing the upper end opening of the heat exchanger, and a lower rectification unit that guides exhaust gas backward, and continuous to the lower rectification unit A bent rectifying portion that bends forward while guiding the exhaust gas guided to the lower rectifying portion upward, and guides the exhaust gas guided to the bent rectifying portion continuously to the bent rectifying portion to the discharge port. An upper rectification unit is formed, and the front end of the lower rectification unit and the front end of the upper rectification unit are opposed to each other with a gap between them,
Providing an open portion penetrating in a predetermined position of the lower rectifying unit;
A sound-absorbing material inserted between the lower rectification unit and the upper rectification unit via a gap between the front end of the lower rectification unit and the front end of the upper rectification unit to close the open portion; Provided,
The sound absorbing material is pressed and clamped between the lower rectification unit and the upper rectification unit by elastic force in a direction in which the lower rectification unit and the upper rectification unit approach each other. .
前記下方整流部の前記吸音材との当接位置には、該吸音材に挿入して該吸音材を移動不能に係止する係止爪が形成されていることを特徴とする請求項1記載のダクト整流板。2. A locking claw that is inserted into the sound absorbing material and locks the sound absorbing material so as to be immovable is formed at a position where the lower rectifying portion contacts the sound absorbing material. Duct rectifier plate. 熱交換器の上端開口部に被冠されて該熱交換器を経て上昇する燃焼排気を前方に形成された排出口から排出する排気ダクトに設けられ、該排気ダクトの内部において前記熱交換器を経て上昇する燃焼排気を、一旦後方に屈曲させた後に前方に屈曲させて前記排出口へ案内する排気経路を形成するダクト整流板の組立方法において、
略矩形状の金属板材の前側半部に該板材を貫通する開放部を設けて下方整流部を形成し、該板材の略中央部を上方に向かって円弧状に屈曲させて屈曲整流部を形成すると同時に、該板材の後側半部を前記下方整流部の上方側に折り返して該下方整流部に前方から後方にわたり間隔を存して対向する上方整流部を形成する折り返し工程と、
前記下方整流部と前記上方整流部とを弾発的に離反させて、その前方に形成された下方整流部と上方整流部との間隙から前記吸音材を前記下方整流部と前記上方整流部との間に挿入し、前記下方整流部と前記上方整流部とが互いに接近する方向に有する復元弾性により該吸音材を前記下方整流部と前記上方整流部との間の前記開放部を閉塞する位置に圧接挟持させる吸音材挿入工程とを備えることを特徴とするダクト整流板の組立方法。
An exhaust duct that is covered with the upper end opening of the heat exchanger and rises through the heat exchanger is provided in an exhaust duct that discharges through a discharge port formed forward, and the heat exchanger is disposed inside the exhaust duct. In the method of assembling a duct rectifying plate that forms an exhaust path that guides the exhaust gas that rises through the exhaust gas that is once bent backward and then bent forward.
An open part that penetrates the plate material is provided in the front half of the substantially rectangular metal plate material to form a downward rectification portion, and a substantially central portion of the plate material is bent upward in an arc shape to form a bending rectification portion. At the same time, a folding step of folding the rear half of the plate material to the upper side of the lower rectifying unit to form an upper rectifying unit facing the lower rectifying unit with an interval from the front to the rear ,
The lower rectification unit and the upper rectification unit are elastically separated, and the sound absorbing material is removed from the gap between the lower rectification unit and the upper rectification unit formed in front of the lower rectification unit and the upper rectification unit. The sound absorbing material is inserted between the lower rectification unit and the upper rectification unit in a direction in which the lower rectification unit approaches each other, and the sound absorbing material is closed at the opening portion between the lower rectification unit and the upper rectification unit. A method of assembling a duct rectifying plate, comprising: a sound absorbing material inserting step of pressing and sandwiching the sound absorbing member.
前記下方整流部の前端縁と前記開放部との間には、内周縁が上方に突出するバーリング孔が形成されており、
前記吸音材挿入工程においては、前記吸音材を内方に案内する板状の吸音材案内治具を、前記バーリング孔の上端に当接して前記下方整流部を押さえ、該吸音材案内治具により前記下方整流部を押さえた状態で前記上方整流部を弾発的に上方に引き上げて該上方整流部を前記下方整流部から離反させ、前記吸音材を該吸音材案内治具に沿って前記下方整流部と前記上方整流部との間の前記開放部を閉塞する位置に挿入することを特徴とする請求項3記載のダクト整流板の組立方法。
Between the front end edge of the lower rectifying unit and the open part, a burring hole is formed with an inner peripheral edge protruding upward,
In the sound absorbing material insertion step, a plate-like sound absorbing material guide jig for guiding the sound absorbing material inward is brought into contact with the upper end of the burring hole to hold down the lower rectifying portion, and the sound absorbing material guide jig With the lower rectifier held down, the upper rectifier is elastically pulled upward to separate the upper rectifier from the lower rectifier, and the sound absorbing material is moved downward along the sound absorbing material guide jig. 4. The duct rectifying plate assembling method according to claim 3, wherein the duct rectifying plate is inserted into a position where the open portion between the rectifying portion and the upper rectifying portion is closed.
前記吸音材挿入工程において前記下方整流部と前記上方整流部との間に前記吸音材を挿入するとき、シート状の前記吸音材を略中央部から折り返して板状の挿入具の先端部に保持させ、該挿入具を前記下方整流部と前記上方整流部との間に挿入することにより吸音材を前記開放部を閉塞する位置に押し込むことを特徴とする請求項3又は4記載のダクト整流板の組立方法。When the sound absorbing material is inserted between the lower rectifying portion and the upper rectifying portion in the sound absorbing material inserting step, the sheet-like sound absorbing material is folded back from a substantially central portion and held at the distal end portion of the plate-shaped insertion tool. The duct rectifying plate according to claim 3 or 4, wherein the sound absorbing material is pushed into a position for closing the open portion by inserting the insertion tool between the lower rectifying portion and the upper rectifying portion. Assembly method.
JP02806999A 1999-02-05 1999-02-05 Duct flow straightening plate and assembly method thereof Expired - Lifetime JP3790062B2 (en)

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