JP2021179277A - Totally primary combustion type burner - Google Patents

Totally primary combustion type burner Download PDF

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JP2021179277A
JP2021179277A JP2020084714A JP2020084714A JP2021179277A JP 2021179277 A JP2021179277 A JP 2021179277A JP 2020084714 A JP2020084714 A JP 2020084714A JP 2020084714 A JP2020084714 A JP 2020084714A JP 2021179277 A JP2021179277 A JP 2021179277A
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air
fuel mixture
burner
frame
permeable material
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万之 赤木
Kazuyuki Akagi
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Rinnai Corp
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Rinnai Corp
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Priority to JP2020084714A priority Critical patent/JP2021179277A/en
Priority to US17/233,740 priority patent/US20210356123A1/en
Priority to KR1020210052098A priority patent/KR20210139148A/en
Publication of JP2021179277A publication Critical patent/JP2021179277A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/02—Premix gas burners, i.e. in which gaseous fuel is mixed with combustion air upstream of the combustion zone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/72—Safety devices, e.g. operative in case of failure of gas supply
    • F23D14/74—Preventing flame lift-off
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/12—Radiant burners
    • F23D14/14—Radiant burners using screens or perforated plates
    • F23D14/145—Radiant burners using screens or perforated plates combustion being stabilised at a screen or a perforated plate
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/34—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air
    • F23D14/36—Burners specially adapted for use with means for pressurising the gaseous fuel or the combustion air in which the compressor and burner form a single unit
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D14/00—Burners for combustion of a gas, e.g. of a gas stored under pressure as a liquid
    • F23D14/46—Details, e.g. noise reduction means
    • F23D14/62—Mixing devices; Mixing tubes
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2209/00—Safety arrangements
    • F23D2209/20—Flame lift-off / stability
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2900/00—Special features of, or arrangements for burners using fluid fuels or solid fuels suspended in a carrier gas
    • F23D2900/14—Special features of gas burners
    • F23D2900/14001—Sealing or support of burner plate borders

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Gas Burners (AREA)

Abstract

To eliminate a need for a heat insulation material for preventing overheating of a burner frame 121 to achieve reduction of costs in a totally primary combustion type burner including a combustion plate part 12 which covers an open surface of a burner body and comprises a burner frame 121, having an air-fuel mixture passing area 121a and an enclosing frame part 121b located at a periphery of the air-fuel mixture passing area 121a, and an air-fuel mixture permeable material 122 which covers the air-fuel mixture passing area 121a and is made of a heat-resistant fiber.SOLUTION: An air-fuel mixture permeable material 122 is disposed so as to overlap with a surface, which is opposite to a burner body, of a burner frame 121. An inner periphery side portion 121bin of an enclosing frame part 121b of the burner frame 121 is provided with a fixing frame 123 which is fixed sandwiching the air-fuel mixture permeable material 122 with the enclosing frame part 121b. A protruding part 122b protruding outward further than the fixing frame 123 is provided at the air-fuel mixture permeable material 122, and an outer periphery side portion 121bout of the enclosing frame part 121b is covered with the protruding part 122b.SELECTED DRAWING: Figure 6

Description

本発明は、内部に混合気が供給されるバーナボディと、バーナボディの開放面を覆う、混合気が噴出する燃焼板部とを備える全一次燃焼式バーナに関する。 The present invention relates to an all-primary combustion type burner including a burner body to which an air-fuel mixture is supplied to the inside and a combustion plate portion for ejecting the air-fuel mixture to cover the open surface of the burner body.

従来、この種の全一次燃焼式バーナとして、特許文献１により、燃焼板部を、中央部の混合気通過領域と混合気通過領域の周囲の囲い枠部とを有するバーナ枠と、バーナ枠の混合気通過領域を覆う耐熱繊維製の混合気透過材とで構成したものが知られている。尚、このもので、バーナ枠は、額縁状であって、混合気通過領域に混合気が通過する単一の開口が形成されている。 Conventionally, as an all-primary combustion type burner of this type, according to Patent Document 1, a burner frame having a combustion plate portion, a mixture passing region in a central portion, and a surrounding frame portion around the air-fuel mixture passing region, and a burner frame are provided. It is known that the material is composed of an air-fuel mixture permeable material made of heat-resistant fiber that covers the air-fuel mixture passage region. In this case, the burner frame has a frame shape, and a single opening through which the air-fuel mixture passes is formed in the air-fuel mixture passage region.

また、このものでは、混合気透過材から噴出する混合気の燃焼で形成される火炎からの輻射熱や対流による加熱でバーナ枠の過熱を生ずることを防止するため、バーナ枠の囲い枠部を、バーナボディと反対側から覆う断熱材を設けている。尚、断熱材は、バーナ枠の囲い枠部のバーナボディと反対側の面に予めスポット溶接した固定枠により固定されている。 Further, in this case, in order to prevent overheating of the burner frame due to radiant heat from the flame formed by combustion of the air-fuel mixture ejected from the air-fuel mixture permeable material and heating by convection, the frame portion of the burner frame is provided. A heat insulating material is provided to cover from the opposite side of the burner body. The heat insulating material is fixed to the surface of the frame portion of the burner frame opposite to the burner body by a fixed frame that is spot-welded in advance.

然し、これでは、固定枠及び断熱材が必要で部品点数が増すと共に、断熱材の組付け工程が必要となり、コストダウンを図る上で障害となっている。 However, this requires a fixed frame and a heat insulating material, which increases the number of parts and requires an assembly process of the heat insulating material, which is an obstacle in reducing the cost.

特開２０１７−１１６１６０号公報Japanese Unexamined Patent Publication No. 2017-116160

本発明は、以上の点に鑑み、バーナ枠の過熱を防止するための断熱材を不要として、コストダウンを図ることができるようにした全一次燃焼式バーナを提供することをその課題としている。 In view of the above points, it is an object of the present invention to provide an all-primary combustion type burner capable of reducing costs by eliminating the need for a heat insulating material for preventing overheating of the burner frame.

上記課題を解決するために、本発明は、内部に混合気が供給されるバーナボディと、バーナボディの開放面を覆う、混合気が噴出する燃焼板部とを備える全一次燃焼式バーナであって、燃焼板部は、中央部の混合気通過領域と混合気通過領域の周囲の囲い枠部とを有するバーナ枠と、バーナ枠の混合気通過領域を覆う耐熱繊維製の混合気透過材とで構成され、バーナ枠の混合気通過領域に混合気が通過する単一又は複数の開口が形成されるものにおいて、混合気透過材は、バーナ枠のバーナボディと反対側の面に重なるように配置され、バーナ枠の囲い枠部の混合気通過領域に近い内周側部分に、混合気透過材を囲い枠部との間に挟み込むようにして固定される固定枠を備え、混合気透過材に、固定枠よりも外側に張り出す張り出し部が設けられ、この張り出し部により、囲い枠部の固定枠より外側に位置する外周側部分が覆われることを特徴とする。 In order to solve the above problems, the present invention is an all-primary combustion type burner including a burner body to which an air-fuel mixture is supplied to the inside and a combustion plate portion for ejecting the air-fuel mixture to cover the open surface of the burner body. The combustion plate portion includes a burner frame having an air-fuel mixture passing region in the central portion and a surrounding frame portion around the air-fuel mixture passing region, and a heat-resistant fiber air-fuel mixture permeable material covering the air-fuel mixture passing region of the burner frame. The air-fuel mixture permeable material overlaps the surface opposite to the burner body of the burner frame in a structure in which a single or multiple openings through which the air-fuel mixture passes are formed in the air-fuel mixture passage region of the burner frame. The air-fuel mixture permeable material is provided with a fixed frame that is arranged and fixed so as to sandwich the air-fuel mixture permeable material between the air-fuel mixture permeable material and the surrounding frame portion on the inner peripheral side portion of the burner frame surrounding frame portion near the air-fuel mixture passing region. In addition, an overhanging portion is provided so as to project outward from the fixed frame, and the overhanging portion covers the outer peripheral side portion located outside the fixed frame of the surrounding frame portion.

ここで、混合気透過材は、耐熱繊維製で内部に空気層を含む。従って、本発明によれば、バーナ枠の囲い枠部の外周側部分を覆う混合気透過材の張り出し部が断熱材として機能し、バーナ枠の過熱を有効に防止することができる。そして、本発明によれば、断熱材を別途設ける必要がなく、コストダウンを図ることができる。 Here, the air-fuel mixture permeable material is made of heat-resistant fiber and contains an air layer inside. Therefore, according to the present invention, the overhanging portion of the air-fuel mixture permeable material that covers the outer peripheral side portion of the surrounding frame portion of the burner frame functions as a heat insulating material, and overheating of the burner frame can be effectively prevented. Further, according to the present invention, it is not necessary to separately provide a heat insulating material, and the cost can be reduced.

また、本発明においては、囲い枠部の外周側部分と混合気透過材の張り出し部との間に隙間が空けられることが望ましい。これによれば、隙間内の空気層の存在でバーナ枠に対する断熱性能を一層向上できる。尚、囲い枠部の外周側部分に、混合気透過材の張り出し部に当接して上記隙間を確保する凸部を周方向の間隔を存して複数設ければ、上記隙間を安定的に確保でき、有利である。 Further, in the present invention, it is desirable that a gap is provided between the outer peripheral side portion of the enclosure portion and the overhanging portion of the air-fuel mixture permeable material. According to this, the heat insulating performance for the burner frame can be further improved by the presence of the air layer in the gap. It should be noted that if a plurality of convex portions that abut on the overhanging portion of the air-fuel mixture permeable material and secure the above-mentioned gap are provided on the outer peripheral side portion of the enclosure frame portion with a circumferential interval, the above-mentioned gap can be stably secured. It is possible and advantageous.

ところで、混合気透過材の材料である耐熱繊維を金属繊維とすることも可能であるが、金属繊維は熱伝導率が高く、断熱性が低下する。一方、混合気透過材をＳｉＣ等の非金属の耐熱繊維製とすれば、耐熱繊維の熱伝導率が低くなるため、混合気透過材の張り出し部による断熱性能を十分に確保できる。 By the way, it is possible to use the heat-resistant fiber, which is the material of the air-fuel mixture permeable material, as the metal fiber, but the metal fiber has a high thermal conductivity and the heat insulating property is lowered. On the other hand, if the air-fuel mixture permeable material is made of a non-metal heat-resistant fiber such as SiC, the thermal conductivity of the heat-resistant fiber is lowered, so that the heat insulating performance of the overhanging portion of the air-fuel mixture permeable material can be sufficiently ensured.

本発明の第１実施形態の全一次燃焼式バーナを具備する燃焼装置の斜視図。The perspective view of the combustion apparatus provided with all the primary combustion type burners of 1st Embodiment of this invention. 図１とは反対側から見た燃焼装置の斜視図。A perspective view of the combustion device seen from the side opposite to FIG. 1. 図１のＩＩＩ−ＩＩＩ線で切断した断面図。Sectional drawing taken along the line III-III of FIG. 図３のＩＶ−ＩＶ線で切断した断面図。FIG. 3 is a cross-sectional view taken along the line IV-IV of FIG. 第１実施形態の全一次燃焼式バーナの燃焼板部の分解状態の斜視図。The perspective view of the disassembled state of the combustion plate part of all the primary combustion type burners of 1st Embodiment. 図５の燃焼板部の組立状態の要部の拡大断面図。FIG. 5 is an enlarged cross-sectional view of a main part of the assembled state of the combustion plate portion of FIG. 第２実施形態の全一次燃焼式バーナの燃焼板部の図５に対応する要部の拡大断面図。The enlarged sectional view of the main part corresponding to FIG. 5 of the combustion plate part of the all primary combustion type burner of 2nd Embodiment.

図１乃至図４に示す燃焼装置は、内部に混合気（燃料ガスと一次空気との混合ガス）が供給されるバーナボディ１１と、バーナボディ１１の下向きの開放面１１１を覆う燃焼板部１２とを備える本発明の実施形態の全一次燃焼式バーナ１と、バーナボディ１１の開放面１１１を囲うボディフランジ部１１２にビス２１で締結される上端の筐フランジ部２２を有する燃焼筐２とを備えている。燃焼筐２の内部には、給湯用の熱交換器３が収納されている。 In the combustion apparatus shown in FIGS. 1 to 4, the burner body 11 to which the air-fuel mixture (mixed gas of fuel gas and primary air) is supplied to the inside and the combustion plate portion 12 covering the downward open surface 111 of the burner body 11 An all-primary combustion type burner 1 according to an embodiment of the present invention including I have. A heat exchanger 3 for hot water supply is housed inside the combustion casing 2.

熱交換器３は、多数のフィン３１とこれらフィン３１を貫通する複数の吸熱管３２とを備えるフィンチューブ型熱交換器で構成されている。燃焼筐２の横方向一側と他側の側板２３，２４の外面には、隣り合う２本の吸熱管３２，３２の接続路を各側板２３，２４との間に画成する接続蓋３３が複数取付けられており、全ての吸熱管３２が直列に接続される。また、上流端の吸熱管３２に接続される接続路を横方向他側の側板２４との間に画成する接続蓋３３には入水口３４が設けられている。 The heat exchanger 3 is composed of a fin tube type heat exchanger including a large number of fins 31 and a plurality of endothermic tubes 32 penetrating the fins 31. On the outer surfaces of the side plates 23 and 24 on one lateral side and the other side of the combustion casing 2, a connecting lid 33 defining a connecting path between two adjacent heat absorbing tubes 32 and 32 between the side plates 23 and 24 is defined. Are attached in plurality, and all the endothermic tubes 32 are connected in series. Further, a water inlet 34 is provided in the connection lid 33 that defines a connection path connected to the heat absorbing tube 32 at the upstream end between the side plate 24 on the other side in the lateral direction.

また、燃焼筐２の後側の側板２５の熱交換器３より上方の部分の内側には、管から成る上下３本の第１水路５１が側板２５に接するように配置され、燃焼筐２の前側の側板２６の熱交換器３より上方の部分の内側にも、管から成る上下３本の第３水路５３が側板２６に接するように配置されている。また、燃焼筐２の横方向一側の側板２３の外面には、上下３本の第１水路５１と熱交換器３の下流端の吸熱管３２との接続路を側板２３との間に画成する流入側ヘッダ蓋５１と、上下３本の第３水路５３の接続路を側板２３との間に画成する流出側ヘッダ蓋５２とを取付け、流出側ヘッダ蓋５２に出湯口５３を設けている。更に、燃焼筐２の横方向他側の側板２４には、図２、図３に示す如く、後側の第１水路５１と前側の第３水路５３とを接続する第２水路５２が設けられている。第２水路５２は、側板２４に形成した横方向内方への窪みとこの窪みを覆うように側板２４の外面に取付けた蓋５４とで構成されている。そして、入水口３４から供給される水が熱交換器３で加熱され、加熱された水が流入側ヘッダ蓋５１内の接続路と第１水路５１と第２水路５２と第３水路５３と流出側ヘッダ蓋５２内の接続路とを介して出湯口５３から出湯されるようにしている。また、燃焼筐２の横方向一側の側板２３には、流出側ヘッダ蓋５２内の接続路の上部から後方にのびる、側板２３に形成した横方向内方への窪みとこの窪みを覆う流出側ヘッダ蓋５２に一体の蓋５２ａとで構成される第４水路５４が設けられている。そして、これら第１乃至第４水路５１〜５４に流れる水により燃焼筐２の各側板２３〜２６が冷却されるようにしている。 The combustion in the interior of the upper part than the heat exchanger 3 side of the side plate 25 after the housing 2, the first water passage 5 1 of the upper and lower three consisting of tubes are arranged in contact with the side plate 25, the combustion housing 2 also on the inside of the above the heat exchanger 3 parts of the front side plate 26 of the third water passage 3 of the upper and lower three consisting of the tube is arranged in contact with the side plate 26. Further, on the outer surface of the lateral one side of the side plate 23 of the combustion housing 2, a connecting channel between the heat absorbing tube 32 at the downstream end of the first water passage 5 1 and the heat exchanger 3 of the upper and lower three between the side plates 23 the inflow-side header cover 51 defining, mounting the outlet side header cover 52 to define between the upper and lower three third water passage 3 connecting passage side plate 23, the tap hole to the outlet side header cover 52 53 Is provided. Further, as shown in FIGS. 2 and 3, the side plate 24 on the other side in the lateral direction of the combustion casing 2 has a second water channel 5 2 connecting the first water channel 5 1 on the rear side and the third water channel 5 3 on the front side. Is provided. The second water passage 5 2, and a lid 54 attached to the outer surface of the side plate 24 so as to cover the recess of the depression Toko in the lateral direction inwardly formed in the side plate 24. Then, the water supplied from the water inlet port 34 is heated by the heat exchanger 3, the heated water is the connecting passage and the first water passage 5 1 in the inflow-side header cover 51 second water passage 5 2 and the third water passage 5 Hot water is discharged from the hot water outlet 53 via the connection path in 3 and the outflow side header lid 52. Further, the side plate 23 on one side in the lateral direction of the combustion casing 2 has a lateral inward dent formed in the side plate 23 extending rearward from the upper part of the connection path in the outflow side header lid 52 and an outflow covering the dent. the fourth water passage 5 4 composed of an integral lid 52a on the side header cover 52 is provided. Then, so that the side plates 23 to 26 of the combustion housing 2 is cooled by the water flowing through these first through fourth water passage 5 1 to 5 4.

また、燃焼筐２の前側の側板２６には、上方から１番目と２番目の２本の第３水路５３，５３の間の側板部分を貫通して燃焼筐２内に突出する点火電極６１と接地電極６２とフレームロッド６３とを有する電極部品６が装着されている。尚、電極部品６には、燃焼筐２内を視認できる覗き窓６４が付設されている。 Further, on the side plate 26 on the front side of the combustion casing 2, an ignition electrode that penetrates the side plate portion between the first and second third water passages 5 3 , 5 3 from above and protrudes into the combustion casing 2. An electrode component 6 having a 61, a ground electrode 62, and a frame rod 63 is mounted. The electrode component 6 is provided with a viewing window 64 that allows the inside of the combustion casing 2 to be visually recognized.

次に、全一次燃焼式バーナ１について詳述する。バーナボディ１１には、混合気を供給するファン４を接続する流入口１１３が開設されている。流入口１１３には、ファン４停止時にバーナボディ１１内に残留する混合気がファン４側に逆流することを阻止する逆止弁１３が装着されている。逆止弁１３は、流入口１１３に嵌め込まれる樹脂製の弁筐１３１と、バーナボディ１１内を向く弁筐１３１の開口部に開閉自在に軸着された樹脂製の弁板１３２とで構成されている。 Next, the all primary combustion type burner 1 will be described in detail. The burner body 11 is provided with an inflow port 113 for connecting a fan 4 for supplying an air-fuel mixture. The inflow port 113 is equipped with a check valve 13 that prevents the air-fuel mixture remaining in the burner body 11 from flowing back to the fan 4 side when the fan 4 is stopped. The check valve 13 is composed of a resin valve housing 131 fitted into the inflow port 113 and a resin valve plate 132 rotatably pivotally attached to the opening of the valve housing 131 facing the inside of the burner body 11. ing.

図５、図６も参照して、燃焼板部１２は、中央部の混合気通過領域１２１ａと混合気通過領域１２１ａの周囲の囲い枠部１２１ｂとを有する板金製のバーナ枠１２１と、バーナ枠１２１の混合気通過領域１２１ａを覆う耐熱繊維製の混合気透過材１２２とで構成されている。本実施形態のバーナ枠１２１の混合気通過領域１２１ａには、混合気が通過する小孔から成る開口１２１ａ´が複数形成されている。混合気透過材１２２は、耐熱繊維のニット状の織物やフェルト状の不織布で構成され、バーナ枠１２１のバーナボディ１１と反対側の面（下面）に重なるように配置される。バーナボディ１１内に供給された混合気は、開口１２１ａ´を通過した後、混合気透過材１２２を透過して噴出し全一次燃焼する。 With reference to FIGS. 5 and 6, the combustion plate portion 12 includes a burner frame 121 made of sheet metal having an air-fuel mixture passage region 121a in the central portion and a surrounding frame portion 121b around the air-fuel mixture passage region 121a, and a burner frame. It is composed of an air-fuel mixture permeating material 122 made of heat-resistant fiber that covers the air-fuel mixture passage region 121a of 121. In the air-fuel mixture passage region 121a of the burner frame 121 of the present embodiment, a plurality of openings 121a ′ consisting of small holes through which the air-fuel mixture passes are formed. The air-fuel mixture permeating material 122 is composed of a knit-like woven fabric of heat-resistant fibers or a felt-like non-woven fabric, and is arranged so as to overlap the surface (lower surface) of the burner frame 121 opposite to the burner body 11. The air-fuel mixture supplied into the burner body 11 passes through the opening 121a ′ and then permeates through the air-fuel mixture permeable material 122 and is ejected to perform all primary combustion.

バーナ枠１２１の囲い枠部１２１ｂの外周には、バーナボディ１１側（上方）に屈曲する段差部１２１ｃを存して外側に張り出す枠フランジ部１２１ｄが形成されている。そして、枠フランジ部１２１ｄをボディフランジ部１１２と筐フランジ部２２との間に挟み込み、更に、枠フランジ部１２１ｄとボディフランジ部１１２との間にパッキン７を介設して、シール性を確保している。尚、図４に明示する如く、バーナ枠１２１の混合気透過領域１２１ａ及び囲い枠部１２１ｂは、前後方向に沿う断面形状が円弧状に湾曲しており、混合気透過材１２３も同様に前後方向に沿う断面形状が円弧状に湾曲している。 A frame flange portion 121d is formed on the outer periphery of the enclosure frame portion 121b of the burner frame 121 so as to have a step portion 121c that bends toward the burner body 11 (upward) and projects outward. Then, the frame flange portion 121d is sandwiched between the body flange portion 112 and the housing flange portion 22, and the packing 7 is interposed between the frame flange portion 121d and the body flange portion 112 to secure the sealing property. ing. As is clearly shown in FIG. 4, the air-fuel mixture permeation region 121a and the enclosure frame portion 121b of the burner frame 121 have a curved cross-sectional shape along the front-rear direction, and the air-fuel mixture permeation material 123 is also in the front-rear direction. The cross-sectional shape along is curved in an arc shape.

ここで、混合気の燃焼で形成される火炎からの輻射熱や対流による加熱でバーナ枠１２１の過熱を生ずる場合、バーナ枠１２１からバーナボディ１１に熱が伝わると、バーナボディ１１の温度がかなり高くなってしまう。その結果、バーナボディ１１の付属品である逆止弁１３に熱による悪影響が及んでしまう。この場合、バーナ枠１２１からバーナボディ１１に伝熱し難くなるように、パッキン７を断熱性に優れたセラミックパッキンで構成することも考えられるが、これではコストが高くなってしまう。パッキン７として通常のものを用いることができるようにするには、バーナ枠１２１の過熱を防止することが必要になる。 Here, when the burner frame 121 is overheated by the radiant heat from the flame formed by the combustion of the air-fuel mixture or the heating by convection, when the heat is transferred from the burner frame 121 to the burner body 11, the temperature of the burner body 11 becomes considerably high. turn into. As a result, the check valve 13, which is an accessory of the burner body 11, is adversely affected by heat. In this case, it is conceivable that the packing 7 is made of a ceramic packing having excellent heat insulating properties so that heat cannot be easily transferred from the burner frame 121 to the burner body 11, but this increases the cost. In order to be able to use a normal packing 7, it is necessary to prevent the burner frame 121 from overheating.

そこで、本実施形態では、バーナ枠１２１の囲い枠部１２１ｂの混合気通過領域１２１ａに近い内周側部分１２１ｂｉｎに、混合気透過材１２２を囲い枠部１２１ｂとの間に挟み込むようにして固定される固定枠１２３を備えている。尚、固定枠１２３は、環状であって、周方向複数個所にバーナ枠１２１側（上方）に突出する絞り部１２３ａが設けられている。そして、これら各絞り部１２３ａを、混合気透過材１２２に形成した各孔１２２ａに挿入して、囲い枠部１２１ｂの内周側部分１２１ｂｉｎにスポット溶接することにより、固定枠１２３を囲い枠部１２１ｂの内周側部分１２１ｂｉｎに固定している。これにより、固定枠１２３の絞り部１２３ａ以外の部分で混合気透過材１２２が囲い枠１２１ｂとの間に挟み込まれることになる。 Therefore, in the present embodiment, the air-fuel mixture permeable material 122 is fixed to the inner peripheral side portion 121bin close to the air-fuel mixture passage region 121a of the enclosure frame portion 121b of the burner frame 121 so as to be sandwiched between the enclosure frame portion 121b. It is provided with a fixed frame 123. The fixed frame 123 is annular, and throttle portions 123a projecting toward the burner frame 121 side (upward) are provided at a plurality of locations in the circumferential direction. Then, each of these drawing portions 123a is inserted into each hole 122a formed in the air-fuel mixture permeable material 122, and spot welded to the inner peripheral side portion 121bin of the surrounding frame portion 121b to enclose the fixed frame portion 123 and the surrounding frame portion 121b. It is fixed to the inner peripheral side portion 121 bin of. As a result, the air-fuel mixture permeable material 122 is sandwiched between the enclosure frame 121b and the portion other than the throttle portion 123a of the fixed frame 123.

混合気透過材１２２には、固定枠１２３よりも外側に張り出す張り出し部１２２ｂが設けられている。そして、この張り出し部１２２ｂにより、囲い枠部１２１ｂの固定枠１２３より外側に位置する外周側部分１２１ｂｏｕｔが覆われるようにしている。ここで、混合気透過材１２２は耐熱繊維製で内部に空気層を含む。従って、囲い枠部１２１ｂの外周側部分１２１ｂｏｕｔを覆う混合気透過材１２２の張り出し部１２２ｂが断熱材として機能し、バーナ枠１２１の過熱、具体的には、バーナ枠１２１の枠フランジ部１２１ｄの過度の温度上昇を有効に防止することができる。そのため、パッキン７として断熱性に優れた高価なものを用いずに済み、更に、バーナ枠１２１の過熱防止のための断熱材を別途設ける必要がなく、コストダウンを図ることができる。 The air-fuel mixture permeating material 122 is provided with an overhanging portion 122b that projects outward from the fixed frame 123. The overhanging portion 122b covers the outer peripheral side portion 121bout located outside the fixed frame 123 of the surrounding frame portion 121b. Here, the air-fuel mixture permeating material 122 is made of heat-resistant fiber and contains an air layer inside. Therefore, the overhanging portion 122b of the air-fuel mixture permeating material 122 that covers the outer peripheral side portion 121bout of the surrounding frame portion 121b functions as a heat insulating material, overheating the burner frame 121, specifically, excessive heating of the frame flange portion 121d of the burner frame 121. It is possible to effectively prevent the temperature rise of. Therefore, it is not necessary to use an expensive packing 7 having excellent heat insulating properties, and it is not necessary to separately provide a heat insulating material for preventing overheating of the burner frame 121, so that the cost can be reduced.

ところで、混合気透過材１２２の材料である耐熱繊維を金属繊維とすることも可能である。然し、金属繊維は熱伝導率が高く、断熱性が低下する。そのため、混合気透過材１２２は、ＳｉＣ等の非金属の耐熱繊維製とすることが望ましい。これによれば、耐熱繊維の熱伝導率が低くなるため、混合気透過材１２２の張り出し部１２２ｂによる断熱性能を十分に確保でき、有利である。 By the way, it is also possible to use the heat-resistant fiber, which is the material of the air-fuel mixture permeation material 122, as a metal fiber. However, metal fibers have high thermal conductivity and poor heat insulating properties. Therefore, it is desirable that the air-fuel mixture permeation material 122 is made of a non-metal heat-resistant fiber such as SiC. According to this, since the thermal conductivity of the heat-resistant fiber is lowered, it is possible to sufficiently secure the heat insulating performance by the overhanging portion 122b of the air-fuel mixture permeable material 122, which is advantageous.

また、図７に示す第２実施形態の如く、混合気透過材１２２の張り出し部１２２ｂを混合気透過材１２２の他の部分に対しバーナ枠１２１から離れる方向（下方）にオフセットさせて、張り出し部１２２ｂと囲い枠部１２１ｂの外周側部分１２１ｂｏｕｔとの間に隙間１２４を空けてもよい。これによれば、隙間１２４内の空気層の存在でバーナ枠１２１に対する断熱性能を一層向上できる。また、第２実施形態では、囲い枠部１２１ｂの外周側部分１２１ｂｏｕｔに、混合気透過材１２２の張り出し部１２２ｂに当接して上記隙間１２４を確保する凸部１２１ｅが周方向の間隔を存して複数設けられている。これによれば、上記隙間１２４を安定的に確保でき、有利である。 Further, as in the second embodiment shown in FIG. 7, the overhanging portion 122b of the air-fuel mixture permeable material 122 is offset with respect to the other portion of the air-fuel mixture permeable material 122 in the direction away from the burner frame 121 (downward), and the overhanging portion is formed. A gap 124 may be provided between the 122b and the outer peripheral side portion 121bout of the surrounding frame portion 121b. According to this, the heat insulating performance for the burner frame 121 can be further improved by the presence of the air layer in the gap 124. Further, in the second embodiment, the convex portion 121e that abuts on the overhanging portion 122b of the air-fuel mixture permeable material 122 and secures the gap 124 has a circumferential interval on the outer peripheral side portion 121bout of the enclosure portion 121b. There are multiple. According to this, the gap 124 can be stably secured, which is advantageous.

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、上記実施形態では、バーナ枠１２１の混合気通過領域１２１ａに、小孔から成る開口１２１ａ´を複数形成しているが、混合気通過領域１２１ａに、その全域に亘る単一の開口を形成することも可能である。この場合、混合気透過材１２２のバーナ枠１２１側の面に、上記実施形態の開口１２１ａ´に相当する小孔を複数形成した分布板を重ね合わせてもよい。また、上記実施形態では、バーナ枠１２１を板金製としているが、アルミダイキャスト製等の板金製以外のものとしてもよい。更に、上記実施形態の全一次燃焼式バーナは、バーナボディ１１の開放面１１１が下を向くように配置しているが、この開放面１１が上を向くように配置する全一次燃焼式バーナにも同様に本発明を適用できる。 Although the embodiments of the present invention have been described above with reference to the drawings, the present invention is not limited thereto. For example, in the above embodiment, a plurality of openings 121a ′ composed of small holes are formed in the air-fuel mixture passage region 121a of the burner frame 121, but a single opening over the entire area is formed in the air-fuel mixture passage region 121a. It is also possible to do. In this case, a distribution plate having a plurality of small holes corresponding to the openings 121a'of the above embodiment may be superposed on the surface of the air-fuel mixture permeating material 122 on the burner frame 121 side. Further, in the above embodiment, the burner frame 121 is made of sheet metal, but it may be made of other than sheet metal such as aluminum die-cast. Further, the all-primary combustion type burner of the above embodiment is arranged so that the open surface 111 of the burner body 11 faces downward, but the all-primary combustion type burner is arranged so that the open surface 11 faces upward. Similarly, the present invention can be applied.

１…全一次燃焼式バーナ、１１…バーナボディ，１１１…開放面、１２…燃焼板部、１２１…バーナ枠、１２１ａ…混合気通過領域、１２１ａ´…開口、１２１ｂ…囲い枠部、１２１ｂｉｎ…内周側部分、１２１ｂｏｕｔ…外周側部分、１２１ｅ…凸部、１２２…混合気透過材、１２３…固定枠、１２４…隙間。 1 ... All primary combustion type burner, 11 ... Burner body, 111 ... Open surface, 12 ... Combustion plate part, 121 ... Burner frame, 121a ... Air-fuel mixture passage area, 121a'... Opening, 121b ... Enclosing frame part, 121bin ... Peripheral side portion, 121bout ... Outer peripheral side portion, 121e ... Convex portion, 122 ... Air-fuel mixture permeable material, 123 ... Fixed frame, 124 ... Gap.

Claims (4)

内部に混合気が供給されるバーナボディと、バーナボディの開放面を覆う、混合気が噴出する燃焼板部とを備える全一次燃焼式バーナであって、燃焼板部は、中央部の混合気通過領域と混合気通過領域の周囲の囲い枠部とを有するバーナ枠と、バーナ枠の混合気通過領域を覆う耐熱繊維製の混合気透過材とで構成され、バーナ枠の混合気通過領域に混合気が通過する単一又は複数の開口が形成されるものにおいて、
混合気透過材は、バーナ枠のバーナボディと反対側の面に重なるように配置され、バーナ枠の囲い枠部の混合気通過領域に近い内周側部分に、混合気透過材を囲い枠部との間に挟み込むようにして固定される固定枠を備え、
混合気透過材に、固定枠よりも外側に張り出す張り出し部が設けられ、この張り出し部により、囲い枠部の固定枠より外側に位置する外周側部分が覆われることを特徴とする全一次燃焼式バーナ。 It is an all-primary combustion type burner including a burner body to which an air-fuel mixture is supplied to the inside and a combustion plate portion where the air-fuel mixture is ejected to cover the open surface of the burner body. The combustion plate portion is the air-fuel mixture in the central portion. It is composed of a burner frame having a passage region and a surrounding frame portion around the air-fuel mixture passage region, and an air-fuel mixture permeating material made of heat-resistant fiber covering the air-fuel mixture passage region of the burner frame, and is formed in the air-fuel mixture passage region of the burner frame. In those where a single or multiple openings through which the air-fuel mixture passes are formed.
The air-fuel mixture permeable material is arranged so as to overlap the surface opposite to the burner body of the burner frame, and the air-fuel mixture permeable material is enclosed in the frame portion on the inner peripheral side portion close to the air-fuel mixture passage region of the enclosure frame portion of the burner frame. Equipped with a fixed frame that is fixed by sandwiching it between
The air-fuel mixture permeating material is provided with an overhanging portion that overhangs the fixed frame, and the overhanging portion covers the outer peripheral side portion located outside the fixed frame of the surrounding frame portion. Ceremony burner. 前記囲い枠部の前記外周側部分と前記混合気透過材の前記張り出し部との間に隙間が空けられることを特徴とする請求項１記載の全一次燃焼式バーナ。 The all-primary combustion type burner according to claim 1, wherein a gap is provided between the outer peripheral side portion of the enclosure portion and the overhanging portion of the air-fuel mixture permeable material. 請求項２記載の全一次燃焼式バーナであって、前記囲い枠部の前記外周側部分に、前記混合気透過材の前記張り出し部に当接して前記隙間を確保する凸部が周方向の間隔を存して複数設けられることを特徴とする全一次燃焼式バーナ。 The all-primary combustion type burner according to claim 2, wherein a convex portion that abuts on the overhanging portion of the air-fuel mixture permeable material and secures the gap is spaced in the circumferential direction on the outer peripheral side portion of the surrounding frame portion. All primary combustion type burners characterized by being provided in multiples. 前記混合気透過材は、非金属の耐熱繊維製であることを特徴とする請求項１〜３の何れか１項記載の全一次燃焼式バーナ。 The all primary combustion type burner according to any one of claims 1 to 3, wherein the air-fuel mixture permeating material is made of a non-metal heat-resistant fiber.
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