JP6497731B2 - Combustion device - Google Patents

Combustion device Download PDF

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JP6497731B2
JP6497731B2 JP2014264709A JP2014264709A JP6497731B2 JP 6497731 B2 JP6497731 B2 JP 6497731B2 JP 2014264709 A JP2014264709 A JP 2014264709A JP 2014264709 A JP2014264709 A JP 2014264709A JP 6497731 B2 JP6497731 B2 JP 6497731B2
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combustion
heat shield
burner
air
plate
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JP2016011824A (en
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貴大 小野
貴大 小野
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Rinnai Corp
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Description

本発明は、バーナを内蔵する燃焼筐と、燃焼筐の外壁板のバーナより上方の部分の内面を覆って外壁板との間に冷却用空気を流す空気通路を画成する遮熱板とを備える燃焼装置に関する。   The present invention includes a combustion housing incorporating a burner, and a heat shield plate that covers an inner surface of a portion of the outer wall plate of the combustion housing above the burner and defines an air passage through which cooling air flows between the outer wall plate and the outer wall plate. The present invention relates to a combustion apparatus provided.

従来、この種の燃焼装置として、遮熱板の上端に外壁板側に屈曲する屈曲部を設け、この屈曲部に、外壁板と遮熱板との間の空気通路から冷却用空気が抜け出る通気孔を形成したものが知られている（例えば、特許文献１参照）。このものでは、空気通路に遮熱板の上端に亘って冷却用空気が流れ、外壁板の耐熱性が確保される。   Conventionally, as this type of combustion device, a bent portion that bends toward the outer wall plate is provided at the upper end of the heat shield plate, and cooling air escapes from the air passage between the outer wall plate and the heat shield plate at the bent portion. The thing which formed the pore is known (for example, refer to patent documents 1). In this case, cooling air flows through the air passage over the upper end of the heat shield plate, and the heat resistance of the outer wall plate is ensured.

ところで、バーナの燃焼ガスは広がりながら上昇し、遮熱板の上部が燃焼ガスに晒される。そのため、上記従来例の如く遮熱板と外壁板との間の空気通路に遮熱板の上端に亘って冷却用空気を流すことで、外壁板の過熱は防止できても、燃焼ガスに晒される遮熱板の上部の過熱は防止できなくなる。   By the way, the combustion gas of the burner rises while spreading, and the upper part of the heat shield is exposed to the combustion gas. Therefore, even if the overheating of the outer wall plate can be prevented by flowing cooling air over the upper end of the heat shielding plate in the air passage between the heat shielding plate and the outer wall plate as in the above conventional example, it is exposed to the combustion gas. It is impossible to prevent overheating of the upper part of the heat shield.

特開２００５−６９６４０号公報JP 2005-69640 A

本発明は、以上の点に鑑み、遮熱板の上部の過熱を抑制して、遮熱板を含む燃焼筐全体の耐熱性を向上できるようにした燃焼装置を提供することをその課題としている。   In view of the above, the present invention has an object to provide a combustion apparatus that can suppress the overheating of the upper portion of the heat shield plate and improve the heat resistance of the entire combustion housing including the heat shield plate. .

上記課題を解決するために、本発明は、バーナを内蔵する燃焼筐と、燃焼筐の外壁板のバーナより上方の部分の内面を覆って外壁板との間に冷却用空気を流す空気通路を画成する遮熱板とを備える燃焼装置であって、燃焼筐内に、前後方向に長手のバーナが横方向に並べて複数並設されるものにおいて、燃焼筐の前面と後面の各外壁板の内面を覆う前側と後側の各遮熱板のバーナより上方に位置する部分の上下方向中間部に、燃焼筐の前面と後面の各外壁板側に屈曲する段部が設けられて、この段部に、空気通路から冷却用空気が噴出する通気孔が形成され、前側と後側の各遮熱板の段部よりも上方部分は、上方に向かって燃焼筐の前面と後面の各外壁板から離隔する方向に傾斜し、前側と後側の各遮熱板の下端の高さはバーナの上端より低く、これら各遮熱板の下端に、燃焼筐の前面と後面の各外壁板から離隔する方向に屈曲する庇部が形成され、この庇部に、各バーナの前後の各端部が係合する切欠きと、空気が上方に噴出する噴出孔とが形成されることを特徴とする。 In order to solve the above-described problems, the present invention provides a combustion housing with a built-in burner, and an air passage through which cooling air flows between the outer wall plate covering the inner surface of a portion above the burner of the outer wall plate of the combustion housing. A combustion apparatus comprising a heat shielding plate to be defined, wherein a plurality of burners longitudinally arranged in the front-rear direction are arranged in parallel in the combustion housing, and each of the outer wall plates on the front and rear surfaces of the combustion housing Steps that bend toward the front and rear outer wall plates of the combustion housing are provided at the middle in the vertical direction of the portion located above the burners of the front and rear heat shield plates that cover the inner surface. Ventilation holes for cooling air to be ejected from the air passages are formed in the air passages, and the upper portions of the front and rear heat shield plates above the stepped portions are the front and rear outer wall plates of the combustion housing. inclined in a direction away from the height of the lower end of each heat shield of the front and rear side lower than the upper end of the burner A flange that bends away from the front and rear outer wall plates of the combustion housing is formed at the lower end of each of the heat shield plates, and the front and rear ends of each burner engage with this flange. A notch and an ejection hole through which air is ejected upward are formed .

本発明によれば、遮熱板のバーナより上方に位置する部分の上下方向中間の段部に形成した通気孔から噴出する冷却用空気が傾斜した遮熱板の上部内面に確実に接触して上方に流れる。そして、この空気流により、遮熱板の上部に燃焼ガスが触れることを防止するエアカーテンが形成される。従って、燃焼ガスによる遮熱板の上部の過熱を抑制して、遮熱板を含む燃焼筐全体の耐熱性を向上できる。
また、本発明によれば、庇部の切欠きに各バーナの前後の端部を係合させることで、各バーナを横方向に位置決めでき、更に、庇部の噴出孔から噴出する空気が庇部の上方の遮熱板の内面に沿って上方に流れ、遮熱板の前記段部より下方部分を効果的に冷却できる。 According to the present invention, the cooling air ejected from the vent hole formed in the step in the middle in the vertical direction of the portion located above the burner of the heat shield plate surely contacts the upper inner surface of the inclined heat shield plate. Flows upward. The air flow forms an air curtain that prevents the combustion gas from touching the upper portion of the heat shield plate. Accordingly, overheating of the upper part of the heat shield plate due to the combustion gas can be suppressed, and the heat resistance of the entire combustion housing including the heat shield plate can be improved.
Further, by the present invention lever, by engaging the end portions of the front and rear of each burner in the notch of the visor portion can position each burner laterally further, the air to be ejected from the ejection holes of the overhang portion It flows upward along the inner surface of the heat shield plate above the flange, and the lower portion of the heat shield plate can be effectively cooled.

本発明の実施形態の燃焼装置の斜視図。The perspective view of the combustion apparatus of embodiment of this invention. 図１のＩＩ−ＩＩ線で切断した燃焼装置の断面図。Sectional drawing of the combustion apparatus cut | disconnected by the II-II line | wire of FIG. 図２のＩＩＩ−ＩＩＩ線で切断した燃焼装置の切断側面図。FIG. 3 is a cut side view of the combustion apparatus cut along line III-III in FIG. 2. 実施形態の燃焼装置の前側の遮熱板の斜視図。The perspective view of the heat shield of the front side of the combustion apparatus of an embodiment. 実施形態の燃焼装置の後側の遮熱板の斜視図。The perspective view of the heat shield of the rear side of the combustion apparatus of an embodiment.

図１乃至図３を参照して、１は、給湯用熱源機から成る燃焼装置を構成する燃焼筐を示している。燃焼筐１の上面は開放されており、燃焼筐１の上に被加熱物として図示省略した給湯用熱交換器が設置される。燃焼筐１内には、燃焼筐１内の空間を燃焼室２とその下側の給気室３とに仕切る仕切り板４が設けられている。燃焼室２内には、上端に混合気（燃料ガスと一次空気との混合ガス）を噴出する多数の炎口５１を有する前後方向に長手のバーナ５が横方向に並べて複数並設されている。   With reference to FIGS. 1 to 3, reference numeral 1 denotes a combustion casing constituting a combustion apparatus including a hot water supply heat source unit. The upper surface of the combustion casing 1 is open, and a hot water supply heat exchanger (not shown) is installed on the combustion casing 1 as an object to be heated. In the combustion housing 1, a partition plate 4 that partitions the space in the combustion housing 1 into a combustion chamber 2 and an air supply chamber 3 below the combustion chamber 2 is provided. In the combustion chamber 2, a plurality of longitudinal burners 5 are arranged in parallel in the front-rear direction having a plurality of flame ports 51 for ejecting air-fuel mixture (mixed gas of fuel gas and primary air) at the upper end. .

給気室３の底面には図外の燃焼ファンが接続されており、燃焼ファンから給気室３に空気が供給される。仕切り板４には、多数の分布孔４１が形成されており、給気室３に供給された空気がこれら分布孔４１を介して燃焼室２に二次空気として供給されるようにしている。   A combustion fan (not shown) is connected to the bottom surface of the air supply chamber 3, and air is supplied from the combustion fan to the air supply chamber 3. A number of distribution holes 41 are formed in the partition plate 4 so that air supplied to the air supply chamber 3 is supplied as secondary air to the combustion chamber 2 through these distribution holes 41.

また、仕切り板４の前端には、上方に屈曲する起立板部４２と、起立板部４２の上端から前方に屈曲して燃焼筐１の前面の外壁板１１に達する上板部４３とが設けられている。そして、給気室３の前端部に、起立板部４２の前側で上板部４３に達するように立上る一次空気室３１が設けられる。起立板部４２には、各バーナ５の下部の混合管部５２の上流端を臨ませる各流入口４４が形成され、一次空気室３１の前面は、ガスマニホールド６で閉塞される。ガスマニホールド６には、各流入口４４に対向する各ノズル６１が設けられており、各流入口４４、即ち、各バーナ５に各ノズル６１から燃料ガスが供給されると共に一次空気室３１から一次空気が供給される。また、燃焼筐１の前面の外壁板１１には、フレームロッド７と点火電極８と覗き窓９とが配置されている。尚、図１ではガスマニホールド６が省略されている。   Further, an upright plate portion 42 bent upward and an upper plate portion 43 bent forward from the upper end of the upright plate portion 42 to reach the outer wall plate 11 on the front surface of the combustion housing 1 are provided at the front end of the partition plate 4. It has been. A primary air chamber 31 that rises so as to reach the upper plate portion 43 on the front side of the upright plate portion 42 is provided at the front end portion of the air supply chamber 3. In the standing plate portion 42, each inlet 44 is formed so as to face the upstream end of the mixing tube portion 52 below each burner 5, and the front surface of the primary air chamber 31 is closed by the gas manifold 6. The gas manifold 6 is provided with nozzles 61 that face the inlets 44, and fuel gas is supplied from the nozzles 61 to the inlets 44, that is, the burners 5, and from the primary air chamber 31. Air is supplied. A frame rod 7, an ignition electrode 8, and a viewing window 9 are arranged on the outer wall plate 11 on the front surface of the combustion housing 1. In FIG. 1, the gas manifold 6 is omitted.

ここで、燃焼筐１のバーナ５よりも上方の外壁板部分はバーナ５の燃焼で強く加熱される。そこで、燃焼筐１の耐熱性を確保するために、燃焼筐１の前面の外壁板１１、後面の外壁板１２及び左右各側面の外壁板１３のバーナ５上端よりも上方の部分の内面を隙間を存して覆う前側と後側と左右各側の遮熱板１４、１５、１６を設けている。そして、前面の外壁板１１と前側の遮熱板１４との間に、仕切り板４の上板部４３に形成した透孔４５を介して一次空気室３１から上昇する空気を冷却用空気として流す空気通路１４ａを画成すると共に、後面の外壁板１２と後側の遮熱板１５との間にも、給気室３から仕切り板４の後部の分布孔４１を介して上昇する空気を冷却用空気として流す空気通路１５ａを画成している。   Here, the outer wall plate portion above the burner 5 of the combustion housing 1 is strongly heated by the combustion of the burner 5. Therefore, in order to ensure the heat resistance of the combustion housing 1, the inner surface of the upper portion of the outer wall plate 11 on the front surface of the combustion housing 1, the outer wall plate 12 on the rear surface, and the outer wall plate 13 on each of the left and right side surfaces above the upper end of the burner 5 The heat shield plates 14, 15, 16 on the front side, the rear side, and the left and right sides are provided. Then, air rising from the primary air chamber 31 is allowed to flow as cooling air between the front outer wall plate 11 and the front heat shield plate 14 through a through hole 45 formed in the upper plate portion 43 of the partition plate 4. The air passage 14a is defined, and the air rising from the air supply chamber 3 through the distribution hole 41 at the rear of the partition plate 4 is also cooled between the rear outer wall plate 12 and the rear heat shield plate 15. An air passage 15a that flows as working air is defined.

尚、前側と後側の遮熱板１４、１５の下端の高さはバーナ５上端よりも若干低くなっており、これら遮熱板１４、１５の下端に、前後の各外壁板１１，１２から離隔する方向（前側の遮熱板１４では後方、後側の遮熱板１５では前方）に屈曲する庇部１４１、１５１を形成している。そして、図４、図５に示す如く、これら各庇部１４１、１５１に各バーナ５の上部の前後の各端部が係合する切欠き１４２、１５２を形成して、各バーナ５が横方向に位置決めされるようにしている。   In addition, the height of the lower end of the heat shield plates 14 and 15 on the front side and the rear side is slightly lower than the upper end of the burner 5, and the lower end of the heat shield plates 14 and 15 is connected to the front and rear outer wall plates 11 and 12. The flanges 141 and 151 are formed so as to be bent in the direction of separation (rear in the front heat shield 14 and forward in the rear heat shield 15). As shown in FIGS. 4 and 5, notches 142 and 152 are formed in the flanges 141 and 151 so that front and rear ends of the upper part of each burner 5 are engaged, and each burner 5 is laterally moved. To be positioned.

各庇部１４１、１５１には、更に、空気が噴出する噴出孔１４５、１５５が形成されており、噴出孔１４５、１５５から噴出する空気が庇部１４１、１５１の上方の遮熱板１４、１５の内面に沿って上方に流れ、この空気流により遮熱板１４、１５が効果的に冷却されるようにしている。尚、噴出孔１４５、１５５は、庇部１４１、１５１の前後方向外方寄りの部分に、切欠き１４２、１５２に連続して形成され、更に、前側の遮熱板１４の庇部１４１には、隣接する切欠き１４２、１４２間に位置させて、小径の第２の噴出孔１４５´が形成されている。   Each of the flange portions 141 and 151 is further formed with ejection holes 145 and 155 through which air is ejected, and the air ejected from the ejection holes 145 and 155 is the heat shield plates 14 and 15 above the flange portions 141 and 151. The heat shield plates 14 and 15 are effectively cooled by this air flow. In addition, the ejection holes 145 and 155 are formed continuously to the notches 142 and 152 on the outer side in the front-rear direction of the flanges 141 and 151, and further on the flange 141 of the heat shield 14 on the front side. A small-diameter second ejection hole 145 ′ is formed between the adjacent notches 142, 142.

また、仕切り板４の上板部４３に形成した透孔４５から噴出する空気の一部が上板部４３の後上方の燃焼室２の部分に流れてしまうと冷却不足を生ずる。そこで、前側の遮熱板１４の庇部１４１の後端に、隣接するバーナ５、５間に位置させて、下方に屈曲する垂下板部１４６を曲成している。そして、庇部１４１と仕切り板４の上板部４３との間の空間が垂下板部１４６により燃焼室２から仕切られ、この空間に透孔４５を介して一次空気室３１から空気が流入するようにしている。これによれば、透孔４５から噴出する空気が上板部４３の後上方の燃焼室２の部分に流れることを垂下板部１４６により防止して、冷却不足を解消できる。   In addition, if a part of the air ejected from the through hole 45 formed in the upper plate portion 43 of the partition plate 4 flows into the combustion chamber 2 part behind the upper plate portion 43, insufficient cooling occurs. Therefore, a drooping plate portion 146 which is positioned between the adjacent burners 5 and 5 and bent downward is formed at the rear end of the flange portion 141 of the front heat shield plate 14. A space between the flange portion 141 and the upper plate portion 43 of the partition plate 4 is partitioned from the combustion chamber 2 by the drooping plate portion 146, and air flows into the space from the primary air chamber 31 through the through holes 45. I am doing so. According to this, the drooping plate portion 146 prevents the air ejected from the through hole 45 from flowing into the portion of the combustion chamber 2 above and behind the upper plate portion 43, thereby eliminating the insufficient cooling.

ところで、バーナ５の燃焼ガスは前後方向に広がりながら上昇し、前側と後側の各遮熱板１４，１５の上部に燃焼ガスが触れて、各遮熱板１４，１５の上部の過熱を生じやすくなる。そこで、本実施形態では、前側と後側の各遮熱板１４，１５のバーナ５より上方に位置する部分の上下方向中間部に、前後の各外壁板１１，１２側に屈曲する段部１４３，１５３を設けて、この段部１４３，１５３に、各空気通路１４ａ，１５ａから冷却用空気が噴出する通気孔１４４、１５４を形成している。更に、各遮熱板１４、１５の段部１４３，１５３よりも上方部分を、上方に向かって各外壁板１１，１２から離隔する方向に傾斜させている。 By the way, the combustion gas of the burner 5 rises while spreading in the front-rear direction, and the combustion gas touches the upper portions of the front and rear heat shield plates 14 and 15 to cause overheating of the upper portions of the heat shield plates 14 and 15. It becomes easy. Therefore, in the present embodiment, a step portion 143 that bends to the front and rear outer wall plates 11 and 12 side at the middle portion of the front and rear heat shield plates 14 and 15 located above the burner 5 in the vertical direction. , 153, and vent holes 144, 154 through which cooling air is ejected from the air passages 14 a, 15 a are formed in the step portions 143, 153. Further, the upper portions of the heat shield plates 14 and 15 above the step portions 143 and 153 are inclined upward in a direction away from the outer wall plates 11 and 12.

これによれば、通気孔１４４，１５４から噴出する冷却用空気が傾斜した遮熱板１４，１５の上部内面に確実に接触して上方に流れる。そして、この空気流により、遮熱板１４，１５の上部に燃焼ガスが触れることを防止するエアカーテンが形成される。従って、燃焼ガスによる遮熱板１４，１５の上部の過熱を抑制して、遮熱板１４，１５を含む燃焼筐１全体の耐熱性を可及的に向上できる。   According to this, the cooling air ejected from the vent holes 144 and 154 surely contacts the upper inner surfaces of the inclined heat shield plates 14 and 15 and flows upward. And the air curtain which prevents that combustion gas touches the upper part of the heat shield plates 14 and 15 by this airflow is formed. Therefore, overheating of the upper part of the heat shield plates 14 and 15 due to the combustion gas can be suppressed, and the heat resistance of the entire combustion housing 1 including the heat shield plates 14 and 15 can be improved as much as possible.

また、遮熱板１４，１５の上部を上記の如く傾斜させると、燃焼ガスの前後方向の広がりが抑制される。そのため、燃焼筐１上に配置する熱交換器の胴部の前後方向寸法を燃焼筐１の前後方向寸法よりある程度小さくしても、胴部内面への燃焼ガスの接触が抑制され、胴部の過熱を生じない。従って、熱交換器をダウンサイジングしてコストダウンを図ることができる。   Further, when the upper portions of the heat shield plates 14 and 15 are inclined as described above, the spread of the combustion gas in the front-rear direction is suppressed. For this reason, even if the longitudinal dimension of the body portion of the heat exchanger disposed on the combustion housing 1 is made somewhat smaller than the longitudinal dimension of the combustion housing 1, the contact of the combustion gas to the inner surface of the body portion is suppressed, Does not cause overheating. Therefore, it is possible to reduce the cost by downsizing the heat exchanger.

以上、本発明の実施形態について図面を参照して説明したが、本発明はこれに限定されない。例えば、上記実施形態は、給湯用熱源機から成る燃焼装置に本発明を適用したものであるが、給湯用熱源機以外の燃焼装置にも同様に本発明を適用できる。   As mentioned above, although embodiment of this invention was described with reference to drawings, this invention is not limited to this. For example, in the above-described embodiment, the present invention is applied to a combustion apparatus including a hot water supply heat source unit. However, the present invention can be similarly applied to combustion apparatuses other than the hot water supply heat source apparatus.

１…燃焼筐、１１，１２…外壁板、１４，１５…遮熱板、１４ａ，１５ａ…空気通路、１４３，１５３…段部、１４４，１５４…通気孔、５…バーナ。
DESCRIPTION OF SYMBOLS 1 ... Combustion housing, 11, 12 ... Outer wall board, 14, 15 ... Heat shield board, 14a, 15a ... Air passage, 143, 153 ... Step part, 144, 154 ... Vent hole, 5 ... Burner.

Claims (1)

バーナを内蔵する燃焼筐と、燃焼筐の外壁板のバーナより上方の部分の内面を覆って外壁板との間に冷却用空気を流す空気通路を画成する遮熱板とを備える燃焼装置であって、燃焼筐内に、前後方向に長手のバーナが横方向に並べて複数並設されるものにおいて、
燃焼筐の前面と後面の各外壁板の内面を覆う前側と後側の各遮熱板のバーナより上方に位置する部分の上下方向中間部に、燃焼筐の前面と後面の各外壁板側に屈曲する段部が設けられて、この段部に、空気通路から冷却用空気が噴出する通気孔が形成され、
前側と後側の各遮熱板の段部よりも上方部分は、上方に向かって燃焼筐の前面と後面の各外壁板から離隔する方向に傾斜し、
前側と後側の各遮熱板の下端の高さはバーナの上端より低く、これら各遮熱板の下端に、燃焼筐の前面と後面の各外壁板から離隔する方向に屈曲する庇部が形成され、この庇部に、各バーナの前後の各端部が係合する切欠きと、空気が上方に噴出する噴出孔とが形成されることを特徴とする燃焼装置。 In the combustion apparatus comprising a combustion housing having a built-in burner, and a heat shield plate defining an air passage for flowing cooling air between the outer wall plate covers the inner surface of the upper portion from the burner of the outer wall plate of the combustion housing In the combustion housing, a plurality of longitudinal burners arranged side by side in the front-rear direction are arranged in parallel ,
The front and rear heat shield plates that cover the inner surfaces of the front and rear outer wall plates of the combustion housing are positioned in the middle in the vertical direction of the portion located above the burner, and the front and rear outer wall plate sides of the combustion housing. A bent step is provided, and a vent hole through which cooling air is ejected from the air passage is formed in the step,
The upper part than the step part of each heat shield plate on the front side and the rear side is inclined upward in a direction away from each outer wall plate on the front surface and the rear surface of the combustion housing ,
The lower end of each of the front and rear heat shields is lower than the upper end of the burner, and the lower end of each of the heat shields has a flange that bends away from the front and rear outer wall plates of the combustion housing. A combustion apparatus characterized in that a notch in which the front and rear ends of each burner are engaged and an ejection hole through which air is ejected upward are formed in the flange .
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