JP2023041109A

JP2023041109A - Gas distribution unit of water heater, and water heater

Info

Publication number: JP2023041109A
Application number: JP2021148284A
Authority: JP
Inventors: 剛太田; Takeshi Ota
Original assignee: Paloma Co Ltd
Current assignee: Paloma Co Ltd
Priority date: 2021-09-13
Filing date: 2021-09-13
Publication date: 2023-03-24

Abstract

To suppress the generation of deformation such as torsion in a packing member in a gas distribution unit of a water heater.SOLUTION: A gas distribution unit 10 used for a water heater 1 comprises a packing member 80 arranged between a first closing member 11 and a second closing member 12. A gas flow passage 18 comprises: plural gas distribution chambers 51B, 53B; and plural guidance passages 51A, 53A arranged on the upstream side of the plural gas distribution chambers 51B, 53B, and a fuel gas flows to each of the gas distribution chambers 51B, 53B via the guidance passages 51A, 53A. The packing member 80 has a sheet-shaped cover part covering at least any gas feed passage.SELECTED DRAWING: Figure 9

Description

本開示は、給湯器のガス分配ユニット及び給湯器に関する。 The present disclosure relates to gas distribution units for water heaters and water heaters.

特許文献１には、給湯器の一例が開示される。この給湯器は、筐体内に、複数のバーナを左右方向に並設してなるバーナユニットを備えた燃焼装置と、燃焼装置の上部に配置される熱交換器とを備え、バーナユニットでの燃焼によって生じる燃焼排気により、熱交換器を通過する水を加熱して出湯させる。更に、燃焼装置の前面には、バーナユニットの各バーナへ燃料ガスを供給するためのマニホールド（ガス分配ユニット）が設けられている。このガス分配ユニットは、バーナに向けてノズルを突設させた本体と、本体の前側に取り付けられる蓋板と、本体と蓋板との間をシールするシール部材とを備える。 Patent Literature 1 discloses an example of a water heater. This water heater includes a combustion device provided with a burner unit in which a plurality of burners are arranged in a horizontal direction, and a heat exchanger disposed above the combustion device, in a housing. The combustion exhaust produced by the heat exchanger heats and taps the water passing through the heat exchanger. Furthermore, a manifold (gas distribution unit) for supplying fuel gas to each burner of the burner unit is provided at the front of the combustion device. This gas distribution unit includes a main body having a nozzle projecting toward the burner, a cover plate attached to the front side of the main body, and a sealing member for sealing between the main body and the cover plate.

特開２０２０―８５２９２号公報Japanese Patent Application Laid-Open No. 2020-85292

特許文献１に開示される給湯器のガス分配ユニットは、本体と蓋板との間を密封し且つ流路を仕切るためにパッキン部材が配置されるが、パッキン部材の各部分（例えば、外縁部分や流路を仕切る部分など）が細くなりやすい構造である。従って、パッキン部材にねじれ等の変形が生じやすく、取付作業の困難性や破損などを招く懸念がある。 In the gas distribution unit of the water heater disclosed in Patent Document 1, a packing member is arranged to seal between the main body and the cover plate and to partition the flow path. and the part that partitions the flow path) tend to be thin. Therefore, the packing member is likely to be twisted or otherwise deformed, which may cause difficulty in mounting work or damage.

本開示は、給湯器のガス分配ユニットにおいてパッキン部材にねじれ等の変形が生じることを抑え得る技術を提供することを一つの目的とする。 An object of the present disclosure is to provide a technology capable of suppressing deformation such as twisting of a packing member in a gas distribution unit of a water heater.

本開示の一つである給湯器のガス分配ユニットは、
燃料ガスが流れるガス流路を備え、給湯器に用いられるガス分配ユニットであって、
前記ガス流路の外部から前記燃料ガスを導入する導入口と、複数のノズルと、を有する第１閉塞部材と、
前記第１閉塞部材に固定され且つ前記第１閉塞部材を一方側から覆う第２閉塞部材と、
前記第１閉塞部材と前記第２閉塞部材との間に配置されるパッキン部材と、
を備え、
前記ガス流路は、前記第１閉塞部材に設けられる複数のガス供給路を備え、
各々の前記ガス供給路は、複数の前記ノズルが設けられるガス分配室と、前記ガス分配室の上流側において前記ガス分配室に前記燃料ガスを導く経路である誘導通路と、を有し、
前記パッキン部材は、少なくともいずれかの前記ガス供給路を覆うシート状の被覆部を有する。 A gas distribution unit for a water heater, which is one of the present disclosure, comprises:
A gas distribution unit for use in a water heater, comprising a gas flow path through which fuel gas flows,
a first closing member having an inlet for introducing the fuel gas from the outside of the gas flow path, and a plurality of nozzles;
a second closing member fixed to the first closing member and covering the first closing member from one side;
a packing member disposed between the first closing member and the second closing member;
with
the gas flow path includes a plurality of gas supply paths provided in the first closing member;
each of the gas supply paths has a gas distribution chamber in which a plurality of the nozzles are provided; and a guide passage, which is a path leading the fuel gas to the gas distribution chamber on the upstream side of the gas distribution chamber,
The packing member has a sheet-like covering portion that covers at least one of the gas supply passages.

本開示に係る技術は、給湯器のガス分配ユニットにおいてパッキン部材にねじれ等の変形が生じることを抑えることができる。 The technique according to the present disclosure can suppress deformation such as twisting of the packing member in the gas distribution unit of the water heater.

図１は、第１実施形態に係る給湯器を例示する正面図である。FIG. 1 is a front view illustrating the water heater according to the first embodiment. FIG. 図２は、図１の給湯器において前面パネルを外した状態を例示する正面図である。2 is a front view illustrating a state in which the front panel is removed in the water heater of FIG. 1; FIG. 図３は、図２の構成からガス分配ユニットを外した構成を例示する正面図である。3 is a front view illustrating a configuration from which the gas distribution unit is removed from the configuration of FIG. 2; FIG. 図４は、図１の給湯器に用いられるガス分配ユニットにガス供給部が組み付けられた構成を例示する斜視図である。4 is a perspective view illustrating a configuration in which a gas supply section is assembled to the gas distribution unit used in the water heater of FIG. 1. FIG. 図５は、ガス分配ユニットにガス供給部が組み付けられた構成を図４とは異なる方向から見た斜視図である。5 is a perspective view of the configuration in which the gas supply unit is assembled to the gas distribution unit, viewed from a direction different from that of FIG. 4. FIG. 図６は、図４の構成の分解斜視図である。6 is an exploded perspective view of the arrangement of FIG. 4; FIG. 図７は、図４の構成を図６とは異なる方向から見た分解斜視図である。7 is an exploded perspective view of the configuration of FIG. 4 viewed from a direction different from that of FIG. 6. FIG. 図８は、図１の給湯器に用いられるガス分配ユニットを示す正面図である。8 is a front view showing a gas distribution unit used in the water heater of FIG. 1; FIG. 図９は、図８の構成から第２閉塞部材を取り外した構成を示す正面図である。9 is a front view showing a configuration in which the second closing member is removed from the configuration in FIG. 8. FIG. 図１０は、図８のガス分配ユニットの第１閉塞部材を示す正面図である。10 is a front view of the first closure member of the gas distribution unit of FIG. 8; FIG. 図１１は、突条におけるパッキン部材と密着する領域等を概念的に示す説明図である。FIG. 11 is an explanatory view conceptually showing a region of the protrusion that comes into close contact with the packing member.

以下では、本開示の実施形態が列記されて例示される。なお、以下で例示される〔１〕～〔５〕の特徴は、矛盾しない組み合わせでどのように組み合わされてもよい。 Embodiments of the present disclosure are listed and illustrated below. The features [1] to [5] exemplified below may be combined in any way in a consistent combination.

〔１〕燃料ガスが流れるガス流路を備え、給湯器に用いられるガス分配ユニットであって、
前記ガス流路の外部から前記燃料ガスを導入する導入口と、複数のノズルと、を有する第１閉塞部材と、
前記第１閉塞部材に固定され且つ前記第１閉塞部材を一方側から覆う第２閉塞部材と、
前記第１閉塞部材と前記第２閉塞部材との間に配置されるパッキン部材と、
を備え、
前記ガス流路は、前記第１閉塞部材に設けられる複数のガス供給路を備え、
各々の前記ガス供給路は、複数の前記ノズルが設けられるガス分配室と、前記ガス分配室の上流側において前記ガス分配室に前記燃料ガスを導く経路である誘導通路と、を有し、
前記パッキン部材は、少なくともいずれかの前記ガス供給路を覆うシート状の被覆部を有する
給湯器のガス分配ユニット。 [1] A gas distribution unit provided with a gas flow path through which fuel gas flows and used in a water heater,
a first closing member having an inlet for introducing the fuel gas from the outside of the gas flow path, and a plurality of nozzles;
a second closing member fixed to the first closing member and covering the first closing member from one side;
a packing member disposed between the first closing member and the second closing member;
with
the gas flow path includes a plurality of gas supply paths provided in the first closing member;
each of the gas supply paths has a gas distribution chamber in which a plurality of the nozzles are provided; and a guide passage, which is a path leading the fuel gas to the gas distribution chamber on the upstream side of the gas distribution chamber,
The gas distribution unit of a water heater, wherein the packing member has a sheet-like covering portion covering at least one of the gas supply passages.

〔１〕に記載のガス分配ユニットでは、パッキン部材は、少なくともいずれかのガス供給路を覆うシート状の被覆部を有するため、シート状の被覆部付近において強度が高められ、パッキン部材にねじれ等の変形が生じることを抑えることができる。 In the gas distribution unit described in [1], since the packing member has the sheet-like covering portion covering at least one of the gas supply passages, the strength near the sheet-like covering portion is increased, and the packing member is less likely to be twisted or the like. deformation can be suppressed.

〔２〕３以上の前記ガス分配室が横並びに配置され、
３以上の前記ガス分配室において、横方向中央側に配置される中央側分配室は、横方向両端にそれぞれ配置される両端分配室よりも前記ノズルの数が少なく、
前記パッキン部材は、前記両端分配室を含む前記ガス供給路を前記シート状の被覆部が覆い、一方の前記両端分配室を覆う前記シート状の被覆部と他方の前記両端分配室を覆う前記シート状の被覆部とを連結する連結部と、前記中央側分配室を含む前記ガス供給路内と連通する複数の開口部と、を有し、
前記連結部は、前記中央側分配室を含む前記ガス供給路に面しつつ架設され、
前記連結部の両側に前記開口部の開口領域が構成される
〔１〕に記載の給湯器のガス分配ユニット。 [2] three or more of the gas distribution chambers are arranged side by side,
Among the three or more gas distribution chambers, the central distribution chamber arranged at the center in the horizontal direction has fewer nozzles than the both end distribution chambers arranged at both ends in the horizontal direction,
In the packing member, the sheet-like covering portion covers the gas supply path including the both-end distribution chambers, and the sheet-like covering portion covers one of the both-ends distribution chambers and the sheet covers the other of the both-ends distribution chambers. and a plurality of openings communicating with the inside of the gas supply passage including the central distribution chamber,
The connecting part is installed facing the gas supply path including the central distribution chamber,
The gas distribution unit for a water heater according to [1], wherein opening areas of the opening are formed on both sides of the connecting portion.

パッキン部材において、ガス供給路を覆わない領域を広く確保しすぎると、圧損が高まり、ガス供給が不均一になる懸念がある。この点に関し、〔２〕に記載のガス分配ユニットは、中央側分配室を含むガス供給路に面しつつ架設されるように連結部が設けられ、連結部の両側に開口領域が構成されるため、圧損を効果的に抑えることができる。一方で、〔２〕に記載のガス分配ユニットは、両端分配室を含むガス供給路の各々を覆う構成でシート状の被覆部が設けられるため、横方向両側の広い領域において強度を高めることができ、ねじれ等の変形をより一層抑制しやすい。 If the area of the packing member that does not cover the gas supply path is too wide, the pressure loss increases and the gas supply becomes non-uniform. Regarding this point, the gas distribution unit described in [2] is provided with a connecting portion so as to be constructed so as to face the gas supply path including the central distribution chamber, and opening regions are formed on both sides of the connecting portion. Therefore, pressure loss can be effectively suppressed. On the other hand, the gas distribution unit described in [2] is provided with a sheet-like covering portion so as to cover each of the gas supply passages including the distribution chambers at both ends. This makes it easier to suppress deformation such as torsion.

〔３〕３以上の前記ガス分配室が横並びに配置され、
３以上の前記ガス分配室において、横方向中央側に配置される中央側分配室は、横方向両端にそれぞれ配置される両端分配室よりも前記ノズルの数が少なく、
前記パッキン部材は、前記両端分配室を含む前記ガス供給路を前記シート状の被覆部が覆い、前記中央側分配室を含む前記ガス供給路に面する複数の長孔を備え、
複数の前記長孔は、前記中央側分配室を含む前記ガス供給路に沿って並んでいる
〔１〕又は〔２〕に記載のガス分配ユニット。 [3] three or more of the gas distribution chambers are arranged side by side;
Among the three or more gas distribution chambers, the central distribution chamber arranged at the center in the horizontal direction has fewer nozzles than the both end distribution chambers arranged at both ends in the horizontal direction,
The packing member has a plurality of elongated holes facing the gas supply path including the both end distribution chambers and the sheet-like covering portion covering the gas supply path including the both end distribution chambers,
The gas distribution unit according to [1] or [2], wherein the plurality of elongated holes are arranged along the gas supply path including the central distribution chamber.

〔３〕に記載のガス分配ユニットは、パッキン部材において両端分配室を含むガス供給路を覆う部分がシート状に構成されるため、横方向両側の広い領域において強度を高めることができ、ねじれ等の変形をより一層抑制しやすい。一方で、パッキン部材において中央側分配室を含むガス供給路付近は、当該ガス供給路に沿った長孔が並んだ構成をなすため、圧損が抑えられ、長孔の利用によって燃料ガスがより円滑に流れやすい。 In the gas distribution unit described in [3], since the portion of the packing member that covers the gas supply path including the distribution chambers at both ends is formed in a sheet shape, the strength can be increased in wide regions on both sides in the horizontal direction, and twisting and the like can be prevented. deformation can be further suppressed. On the other hand, in the packing member, the vicinity of the gas supply path including the central distribution chamber has a configuration in which long holes are arranged along the gas supply path. easy to flow.

〔４〕前記第２閉塞部材は、前記燃料ガスが入り込む空間を構成する溝部を有し、
前記シート状の被覆部は、いずれかの前記ガス供給路と前記溝部とに重なる重なり部を有し、
前記重なり部には、前記ガス供給路内の空間と前記溝部内の空間とを連通する複数の孔部が設けられ、
複数の前記孔部は、前記誘導通路内の空間と前記溝部内の空間とに連通する上流側孔部と、前記ガス分配室内の空間と前記溝部内の空間とに連通する下流側孔部とを有し、
前記溝部は、前記上流側孔部から前記下流側孔部へと前記燃料ガスが流れる構成をなす
〔１〕から〔３〕のいずれか一項に記載の給湯器のガス分配ユニット。 [4] The second closing member has a groove portion forming a space into which the fuel gas enters,
the sheet-like covering portion has an overlapping portion that overlaps one of the gas supply passages and the groove portion;
The overlapping portion is provided with a plurality of holes communicating between the space in the gas supply path and the space in the groove,
The plurality of holes includes an upstream hole communicating with the space in the guide passage and the space in the groove, and a downstream hole communicating with the space in the gas distribution chamber and the space in the groove. has
The gas distribution unit for a water heater according to any one of [1] to [3], wherein the groove portion is configured such that the fuel gas flows from the upstream side hole portion to the downstream side hole portion.

〔４〕に記載のガス分配ユニットは、第１閉塞部材に設けられたガス供給路内の空間と第２閉塞部材に設けられた溝部内の空間とを重なり部によって仕切ることができるため、第１閉塞部材側と第２閉塞部材側とに分流するような流路を構成することができる。しかも、重なり部は、ガス供給路を覆う構成でシート状に設けられるため、ガス供給路内の空間と第２閉塞部材の溝部内の空間との独立性が高まり、各々の空間で他の空間の影響を抑えた流れを生じさせることができる。更に、このガス分配ユニットは、第２閉塞部材の溝部を介してバイパスさせる構成で下流側孔部から上流側孔部に向かうようにガス分配室へと燃料ガスを導く経路を確保することができる。よって、ガス供給路の流れに起因するガス分配室への排出とバイパス経路に起因するガス分配室への排出とによって流れ込みが調整される。 In the gas distribution unit described in [4], the space in the gas supply path provided in the first closing member and the space in the groove provided in the second closing member can be partitioned by the overlapping portion. It is possible to construct a channel that divides the flow into the first closing member side and the second closing member side. Moreover, since the overlapping portion is provided in a sheet-like configuration so as to cover the gas supply passage, the space in the gas supply passage and the space in the groove portion of the second closing member are more independent, and each space is different from the other. It is possible to generate a flow in which the influence of is suppressed. Furthermore, this gas distribution unit can secure a path for guiding the fuel gas from the downstream side hole to the upstream side hole to the gas distribution chamber by bypassing through the groove of the second closing member. . Thus, the inflow is regulated by the discharge to the gas distribution chamber due to the flow of the gas supply path and the discharge to the gas distribution chamber due to the bypass path.

〔５〕〔１〕から〔４〕のいずれか一項に記載のガス分配ユニットを有する給湯器。 [5] A water heater having the gas distribution unit according to any one of [1] to [4].

〔５〕に記載の給湯器は、上記のガス分配ユニットと同様の効果を生じさせることができる。 The water heater described in [5] can produce the same effects as the gas distribution unit described above.

＜第１実施形態＞
以下の説明は、第１実施形態に係る給湯器１に関する。
１．給湯器１の全体構成
図１は、第１実施形態に係る給湯器１を例示する正面図である。図２は、給湯器１の筐体２から前面カバー２Ａ等を外した構成を簡略的に例示する正面図である。図３は、図２の構成から、ガス分配ユニット１０等を外した構成を簡略的に例示する正面図である。 <First Embodiment>
The following description relates to the water heater 1 according to the first embodiment.
1. Overall Configuration of Water Heater 1 FIG. 1 is a front view illustrating a water heater 1 according to a first embodiment. FIG. 2 is a front view schematically illustrating a configuration in which the front cover 2A and the like are removed from the housing 2 of the water heater 1. As shown in FIG. FIG. 3 is a front view simply illustrating a configuration in which the gas distribution unit 10 and the like are removed from the configuration of FIG.

図２のように、給湯器１は、筐体２、燃焼装置３、熱交換器４，排気部５、ファン７などを備える。筐体２は、金属材料によって構成される箱状のケースであり、前方が開放した箱体をなす筐体本体２Ｂと、筐体本体２Ｂに対して着脱される前面カバー２Ａとを備える。前面カバー２Ａは、筐体本体２Ｂを前側から閉塞する。筐体２は、燃焼装置３、熱交換器４，排気部５、ファン７などの各部品を収容する。燃焼装置３は、筐体２の内部において中央付近に配置される。熱交換器４は、筐体２の内部において燃焼装置３の上方に配置される。排気部５は、筐体２の内部において熱交換器４の上方に配置される。ガス分配ユニット１０は、燃焼装置３と前面カバー２Ａとの間に配置される。ファン７は、筐体２の内部において燃焼装置３の下側に配置される。 As shown in FIG. 2, the water heater 1 includes a housing 2, a combustion device 3, a heat exchanger 4, an exhaust section 5, a fan 7, and the like. The housing 2 is a box-shaped case made of a metal material, and includes a housing main body 2B having a box shape with an open front, and a front cover 2A detachable from the housing main body 2B. The front cover 2A closes the housing body 2B from the front side. The housing 2 accommodates components such as the combustion device 3, the heat exchanger 4, the exhaust section 5, the fan 7, and the like. The combustion device 3 is arranged near the center inside the housing 2 . The heat exchanger 4 is arranged above the combustion device 3 inside the housing 2 . The exhaust unit 5 is arranged above the heat exchanger 4 inside the housing 2 . A gas distribution unit 10 is arranged between the combustion device 3 and the front cover 2A. The fan 7 is arranged below the combustion device 3 inside the housing 2 .

燃焼装置３は、インナーケース１２０、バーナユニット（図示省略）、内板１２３（図３）などを備える。インナーケース１２０は、筐体２内に収まる角箱状のケースである。インナーケース１２０内には、扁平状の濃淡バーナであるバーナユニットを左右方向に並設してなるバーナユニット群が設けられる。各濃淡バーナ（図示省略）は、前方に開口して燃料ガス及び一次空気が導入される図示しない淡側導入口と濃側導入口とを上下に有し、上端に、中央の淡炎孔及びその左右両側の濃炎孔からなる炎孔部を備えている。本明細書では、バーナユニットが並ぶ方向が左右方向であり、図１０における複数のノズル３４からなるノズル群のうち、上段の複数のノズル３４が並ぶ方向も、下段の複数のノズル３４が並ぶ方向も、左右方向である。左右方向は、横方向とも称される。また、図１のように筐体２を正面視した場合において筐体２の外縁の短辺の方向（短手方向）が左右方向であり、長辺の方向（短手方向）が上下方向である。上記左右方向及び上記前後方向と直交する方向が前後方向である。 The combustion device 3 includes an inner case 120, a burner unit (not shown), an inner plate 123 (FIG. 3), and the like. The inner case 120 is a box-shaped case that fits inside the housing 2 . In the inner case 120, there is provided a burner unit group in which burner units, which are flat-shaped dark and light burners, are arranged side by side in the left-right direction. Each rich/lean burner (not shown) has a light side introduction port (not shown) and a rich side introduction port (not shown) which are open forward and into which fuel gas and primary air are introduced. It has a flame hole part consisting of thick flame holes on both left and right sides. In this specification, the direction in which the burner units are arranged is the horizontal direction, and in the nozzle group consisting of the plurality of nozzles 34 in FIG. is also in the left-right direction. The left-right direction is also referred to as the lateral direction. When the housing 2 is viewed from the front as shown in FIG. 1, the direction of the short sides (transverse direction) of the outer edge of the housing 2 is the horizontal direction, and the direction of the long sides (transverse direction) is the vertical direction. be. A direction orthogonal to the left-right direction and the front-rear direction is the front-rear direction.

図３に示される内板１２３は、例えば、側面視Ｌ字状の形状をなしている。内板１２３の前面部（前板部）には、各濃淡バーナの淡側導入口と濃側導入口とにそれぞれ対応して、上下に長い長孔状の孔部（長円状のバーリング孔）である下側の淡ガス供給孔１２５と、円形状の孔部（円形状のバーリング孔）である上側の濃ガス供給孔１２６とが設けられている。例えば、１つの濃淡バーナの淡側導入口及び濃側導入口に対応して一対の淡ガス供給孔１２５及び濃ガス供給孔１２６が設けられ、内板１２３の前面部（前板部）には、淡ガス供給孔１２５及び濃ガス供給孔１２６の対が、左右方向に並設されている。具体的には、複数の淡ガス供給孔１２５が所定間隔で左右方向に並び、複数の濃ガス供給孔１２６が所定間隔で左右方向に並んでいる。インナーケース１２０の前面上部には、点火用の放電電極、炎検出用のフレームロッドなどが設けられている。 The inner plate 123 shown in FIG. 3 has, for example, an L-shape when viewed from the side. In the front part (front plate part) of the inner plate 123, vertically elongated holes (elliptic burring holes) are provided corresponding to the light side introduction port and the rich side introduction port of each rich and thin burner. ) and an upper rich gas supply hole 126 that is a circular hole (circular burring hole). For example, a pair of a light gas supply hole 125 and a rich gas supply hole 126 are provided corresponding to the light side inlet and the rich side inlet of one rich and lean burner. , a pair of a light gas supply hole 125 and a rich gas supply hole 126 are arranged side by side in the left-right direction. Specifically, a plurality of light gas supply holes 125 are arranged in the left-right direction at predetermined intervals, and a plurality of rich gas supply holes 126 are arranged in the left-right direction at predetermined intervals. A discharge electrode for ignition, a frame rod for flame detection, and the like are provided on the front upper portion of the inner case 120 .

熱交換器４は、自身の外殻を構成する金属製のケーシングと、このケーシングの内部に収容される伝熱管とを備える。熱交換器４は、燃焼装置３からの燃焼排気を導入して内部を通過させ、この燃焼排気と伝熱管内を流れる水との間で熱交換を行う。熱交換器４内を通過した燃焼排気は排気部５に排出される。 The heat exchanger 4 includes a metal casing that constitutes its outer shell, and heat transfer tubes housed inside the casing. The heat exchanger 4 introduces combustion exhaust gas from the combustion device 3 and allows it to pass therethrough, and performs heat exchange between this combustion exhaust gas and water flowing through the heat transfer tubes. The combustion exhaust that has passed through the heat exchanger 4 is discharged to the exhaust section 5 .

排気部５は、排気筒１１０を備える。排気部５は、熱交換器４から排出された燃焼排気を上方に導き、排気筒１１０を介して給湯器１の外部へ排出するように機能する。 The exhaust section 5 includes an exhaust tube 110 . The exhaust part 5 functions to guide the combustion exhaust discharged from the heat exchanger 4 upward and discharge it to the outside of the water heater 1 via the exhaust pipe 110 .

ファン７は、燃焼用空気を供給するファンである。ファン７は、モータや羽根などを有する駆動部と、燃焼用空気を供給する供給口とを備え、この供給口から燃焼装置３に向けて燃焼用空気を送り込む。ファン７の供給口は、燃焼装置３の下端部付近に固定される。 The fan 7 is a fan that supplies combustion air. The fan 7 includes a driving portion having a motor, blades, etc., and a supply port for supplying combustion air, and the combustion air is sent from the supply port toward the combustion device 3 . A supply port of the fan 7 is fixed near the lower end of the combustion device 3 .

筐体２の下側には、外部のガス管が接続されるガス入口９１と、水道管が接続される水入口９２と、湯出口９３とが設けられている。ガス入口９１は、給湯器１の外部に設けられるガス管からガスが導入される導入口である。ガス入口９１に導入されたガスは、元弁や比例弁等を備えたガス供給部１１４を介してガス分配ユニット１０に供給される。水入口９２は、給湯器１の外部に設けられる水道管から水が導入される導入口である。水入口９２に導入された水は、給水管１１５を介して熱交換器４の伝熱管に供給される。湯出口９３は、湯を給湯器１の外部に導出する出湯口である。熱交換器４の伝熱管から導出された湯は、伝熱管の下流端に接続された出湯管１１６を介して湯出口９３から排出される。 A gas inlet 91 to which an external gas pipe is connected, a water inlet 92 to which a water pipe is connected, and a water outlet 93 are provided on the lower side of the housing 2 . The gas inlet 91 is an inlet through which gas is introduced from a gas pipe provided outside the water heater 1 . A gas introduced into the gas inlet 91 is supplied to the gas distribution unit 10 through a gas supply section 114 having a main valve, a proportional valve, and the like. The water inlet 92 is an inlet through which water is introduced from a water pipe provided outside the water heater 1 . Water introduced into the water inlet 92 is supplied to the heat transfer tubes of the heat exchanger 4 via the water supply pipe 115 . The hot water outlet 93 is a hot water outlet for leading hot water to the outside of the water heater 1 . The hot water drawn out from the heat transfer pipe of the heat exchanger 4 is discharged from the hot water outlet 93 through the hot water discharge pipe 116 connected to the downstream end of the heat transfer pipe.

２．ガス分配ユニット１０
図２、図３に示されるガス分配ユニット１０は、燃料ガスを分流させて燃焼装置３に供給する流路である。ガス分配ユニット１０は、インナーケース１２０の前面に設けられた開口を塞ぐ構成で、インナーケース１２０の前面部下側に組み付けられている。図４～図７のように、ガス分配ユニット１０は、板状の第１閉塞部材１１と板状の第２閉塞部材１２とシート状の区画部材１３とを備える。第１閉塞部材１１と第２閉塞部材１２は、前後に重なり、第１閉塞部材１１と第２閉塞部材１２との間に区画部材１３が挟まって介在する構成で、第１閉塞部材１１、第２閉塞部材１２、区画部材１３が前後に重なって配置される。 2. gas distribution unit 10
A gas distribution unit 10 shown in FIGS. 2 and 3 is a channel for diverting the fuel gas and supplying it to the combustion device 3 . The gas distribution unit 10 is assembled to the lower side of the front surface of the inner case 120 so as to block the opening provided on the front surface of the inner case 120 . As shown in FIGS. 4 to 7, the gas distribution unit 10 includes a plate-like first closing member 11, a plate-like second closing member 12, and a sheet-like partitioning member 13. As shown in FIGS. The first closing member 11 and the second closing member 12 overlap each other in the front-rear direction, and the partitioning member 13 is interposed between the first closing member 11 and the second closing member 12. 2 A closing member 12 and a partitioning member 13 are arranged so as to overlap each other in the front-rear direction.

区画部材１３は、例えば、コルクやゴム等の柔軟性を有する材料によって可撓性を有するシート状又は板状に構成される。区画部材１３は、第１閉塞部材１１と第２閉塞部材１２との間に挟まれるパッキン部材８０を有する。図６、図７の例では、区画部材１３は、パッキン部材８０のみによって構成されるが、パッキン部材８０以外に何らかの部材が付加されていてもよい。 The partitioning member 13 is made of a flexible material such as cork or rubber in a flexible sheet-like or plate-like shape. The partition member 13 has a packing member 80 sandwiched between the first closing member 11 and the second closing member 12 . In the examples of FIGS. 6 and 7, the partitioning member 13 is composed only of the packing member 80, but some member other than the packing member 80 may be added.

ガス分配ユニット１０は、全体的に扁平状である。ガス分配ユニット１０の内部には、燃料ガスが流れるガス流路１８が設けられる。第１閉塞部材１１の後面部の下端側にガス供給部１１４が設けられている。ガス流路１８は、第１閉塞部材１１における第２閉塞部材１２側の第１壁部１１Ａと、第２閉塞部材１２における第１閉塞部材１１側の第２壁部１１Ｂとを有し、第１壁部１１Ａと第２壁部１１Ｂの間の内部空間を燃料ガスが流れる構成である。具体的には、ガス流路１８は、第１閉塞部材１１に設けられた複数のガス供給路３０（図６）と、第２閉塞部材１２に設けられた複数の第２溝部６２（図７）と、パッキン部材８０に設けられた複数の孔部８２とによって構成される。ガス流路１８は、ガス供給路３１内の空間、第２溝部６２内の空間、孔部８２内の空間を、燃料ガスが流れる構成をなす。 The gas distribution unit 10 is generally flat. Inside the gas distribution unit 10, a gas channel 18 is provided through which the fuel gas flows. A gas supply portion 114 is provided on the lower end side of the rear surface portion of the first closing member 11 . The gas flow path 18 has a first wall portion 11A of the first closing member 11 on the second closing member 12 side and a second wall portion 11B of the second closing member 12 on the first closing member 11 side. It is configured such that the fuel gas flows through the internal space between the first wall portion 11A and the second wall portion 11B. Specifically, the gas flow path 18 includes a plurality of gas supply paths 30 ( FIG. 6 ) provided in the first closing member 11 and a plurality of second grooves 62 ( FIG. 7 ) provided in the second closing member 12 . ) and a plurality of holes 82 provided in the packing member 80 . The gas flow path 18 has a configuration in which the fuel gas flows through the space within the gas supply path 31 , the space within the second groove portion 62 , and the space within the hole portion 82 .

第１閉塞部材１１は、ガス分配ユニット１０において後方側を閉塞する部材である。第１閉塞部材１１は、金属材料（例えば、アルミダイカスト）によって構成され、板状をなしている（図６、図７参照）。第１閉塞部材１１は、左右横長の上板部２１と、上板部２１の左右方向一方側（図１０において右側）から下側に張り出す下板部２２とを有する。上板部２１及び下板部２２の外周側（具体的には、第２閉塞部材１２によって覆われる領域の外側）には、インナーケース１２０へのネジ止め用の孔部２３，２３・・が形成されている（図４参照）。上板部２１の左右方向他方側（図１０において左側）には、前方へ突出する２つの凸部２５，２５と、前方へ突出しつつ曲がった形状の２つの爪部２７，２７とが交互に配置されてなるハーネス保持部が形成されている（図４参照）。 The first closing member 11 is a member that closes the rear side of the gas distribution unit 10 . The first closing member 11 is made of a metal material (for example, die-cast aluminum) and has a plate shape (see FIGS. 6 and 7). The first closing member 11 has an upper plate portion 21 that is horizontally long, and a lower plate portion 22 that projects downward from one side of the upper plate portion 21 in the left-right direction (the right side in FIG. 10). Holes 23, 23, . formed (see FIG. 4). On the other side of the upper plate portion 21 in the left-right direction (the left side in FIG. 10), two convex portions 25, 25 protruding forward and two claw portions 27, 27 protruding forward and having a curved shape are alternately arranged. Arranged harness holding portions are formed (see FIG. 4).

図１０のように、第１閉塞部材１１は、ガス流路１８の外部から燃料ガスを導入する複数の導入口３６と、ガス分配ユニット１０の外部に燃料ガスを放出するための複数のノズル３４と、複数の第１溝部４１とを有する部材である。各々の第１溝部４１内には、導入口３６と複数のノズル３４が設けられ、各々の第１溝部４１において、導入口３６からノズル３４へと燃料ガスが流れる個別流路４２が構成される。 As shown in FIG. 10, the first closing member 11 includes a plurality of inlets 36 for introducing the fuel gas from the outside of the gas flow path 18 and a plurality of nozzles 34 for discharging the fuel gas to the outside of the gas distribution unit 10. , and a plurality of first grooves 41 . An inlet 36 and a plurality of nozzles 34 are provided in each of the first grooves 41, and individual flow paths 42 through which the fuel gas flows from the inlet 36 to the nozzles 34 are formed in each of the first grooves 41. .

図１０のように、第１閉塞部材１１の前面部において各孔部２３によって囲まれる内側領域には、ガス供給路３１、ガス供給路３２、ガス供給路３３を有するガス供給路３０が形成されている。ガス供給路３０は、リブ状に構成された突条４０によって複数の領域（ガス供給路３１、ガス供給路３２、ガス供給路３３を有するガス供給路３０）に区切られている。突条４０の突出側の端面（前端面）は、パッキン部材８０に密着し、突条４０とパッキン部材８０との間から燃焼ガスが漏れないようになっている。なお、図１１には、第１閉塞部材１１において、パッキン部材８０に密着する部分がハッチング領域として示される。ガス供給路３０において上側の領域は、内板１２３に設けられた各濃淡バーナの淡ガス供給孔１２５（図３）と濃ガス供給孔１２６（図３）との形成領域と前後方向にオーバーラップする領域を有し、このオーバーラップする領域に複数のノズル３４が設けられている。複数のノズル３４は、上下一組のノズル３４，３４が、１つの濃淡バーナの淡ガス供給孔１２５及び濃ガス供給孔１２６に対応して対をなして設けられ、このような上下一組のノズル３４，３４の対が、インナーケース１２０に収容された複数の濃淡バーナの数に合わせて左右方向に複数並設されている。一組のノズル３４，３４が左右方向の並んだノズル群は、ガス供給路３１、ガス供給路３２、ガス供給路３３に跨って配置されている。ガス供給路３１を構成する第１溝部４１は、第１溝部４１Ａとも称される。ガス供給路３２を構成する第１溝部４１は、第１溝部４１Ｂとも称される。ガス供給路３３を構成する第１溝部４１は、第１溝部４１Ｃとも称される。 As shown in FIG. 10, a gas supply path 30 having a gas supply path 31, a gas supply path 32, and a gas supply path 33 is formed in the inner area surrounded by the holes 23 on the front surface of the first closing member 11. ing. The gas supply channel 30 is divided into a plurality of regions (the gas supply channel 30 having the gas supply channel 31, the gas supply channel 32, and the gas supply channel 33) by rib-shaped ridges 40. As shown in FIG. The protruding end face (front end face) of the ridge 40 is in close contact with the packing member 80 so that combustion gas does not leak from between the ridge 40 and the packing member 80 . In addition, in FIG. 11 , a portion of the first closing member 11 that comes into close contact with the packing member 80 is shown as a hatched area. The upper region of the gas supply path 30 overlaps in the front-rear direction with the formation region of the light gas supply holes 125 (FIG. 3) and the rich gas supply holes 126 (FIG. 3) of each rich and lean burner provided in the inner plate 123. A plurality of nozzles 34 are provided in this overlapping region. A plurality of nozzles 34 are provided as a pair of upper and lower nozzles 34, 34 corresponding to the light gas supply hole 125 and the rich gas supply hole 126 of one rich and lean burner. A plurality of pairs of nozzles 34 , 34 are arranged side by side in the left-right direction according to the number of the plurality of dark and light burners accommodated in the inner case 120 . A nozzle group in which a pair of nozzles 34 and 34 are arranged in the horizontal direction is arranged across the gas supply passage 31 , the gas supply passage 32 , and the gas supply passage 33 . The first groove portion 41 forming the gas supply path 31 is also referred to as a first groove portion 41A. The first groove portion 41 forming the gas supply path 32 is also referred to as a first groove portion 41B. The first groove portion 41 forming the gas supply path 33 is also referred to as a first groove portion 41C.

ガス供給路３１は、第１溝部４１Ａを備えるとともにガス供給路３０における左右方向一方側（図１０においてガス供給路３２より右側）に配置される供給路であり、ガス供給路３１、ガス供給路３２、ガス供給路３３の中でノズル３４，３４の組が最も多い供給路である。ガス供給路３２は、第１溝部４１Ｂを備えるとともにガス供給路３０において左右方向中央側に配置される供給路である。ガス供給路３３は、第１溝部４１Ｃを備えるとともにガス供給路３０において左右方向他方側（図１０において、ガス供給路３２より左側）に配置される供給路である。 The gas supply path 31 is a supply path that includes the first groove portion 41A and is arranged on one side in the left-right direction of the gas supply path 30 (the right side of the gas supply path 32 in FIG. 10). 32, the gas supply path 33, which has the largest number of pairs of nozzles 34,34. The gas supply path 32 is a supply path that includes the first groove portion 41B and is arranged on the center side in the left-right direction of the gas supply path 30 . The gas supply path 33 is a supply path that includes a first groove portion 41C and is arranged on the other side in the left-right direction of the gas supply path 30 (the left side of the gas supply path 32 in FIG. 10).

ガス供給路３１は、第１溝部４１Ａによって構成される。ガス供給路３１を構成する第１溝部４１Ａには導入口３６Ａが設けられ、第１溝部４１Ａにおいて、導入口３６Ａから第１溝部４１Ａ内に設けられた複数のノズル３４へと燃料ガスが流れるように個別流路４２Ａが構成される。ガス供給路３２は、第１溝部４１Ｂによって構成される。ガス供給路３２を構成する第１溝部４１Ｂには導入口３６Ｂが設けられ、第１溝部４１Ｂにおいて、導入口３６Ｂから第１溝部４１Ｂ内に設けられた複数のノズル３４へと燃料ガスが流れるように個別流路４２Ｂが構成される。ガス供給路３３は、第１溝部４１Ｃによって構成される。ガス供給路３３を構成する第１溝部４１Ｃには導入口３６Ｃが設けられ、第１溝部４１Ｃにおいて、導入口３６Ｃから第１溝部４１Ｃ内に設けられた複数のノズル３４へと燃料ガスが流れるように個別流路４２Ｃが構成される。導入口３６Ａ，３６Ｂ，３６Ｃは、ガス供給部１１４（図４、図５）に設けられた電磁弁によって開閉される。 The gas supply path 31 is configured by the first groove portion 41A. An introduction port 36A is provided in the first groove portion 41A that constitutes the gas supply path 31, and the fuel gas is caused to flow from the introduction port 36A to the plurality of nozzles 34 provided in the first groove portion 41A in the first groove portion 41A. 42A of individual flow paths are comprised in this. The gas supply path 32 is configured by the first groove portion 41B. An introduction port 36B is provided in the first groove portion 41B that constitutes the gas supply path 32. In the first groove portion 41B, the fuel gas is caused to flow from the introduction port 36B to the plurality of nozzles 34 provided in the first groove portion 41B. An individual flow path 42B is formed in . The gas supply path 33 is configured by the first groove portion 41C. An introduction port 36C is provided in the first groove portion 41C that constitutes the gas supply path 33, and the fuel gas is caused to flow from the introduction port 36C to the plurality of nozzles 34 provided in the first groove portion 41C in the first groove portion 41C. 42 C of individual flow paths are comprised in this. The introduction ports 36A, 36B, 36C are opened and closed by solenoid valves provided in the gas supply section 114 (FIGS. 4 and 5).

第２閉塞部材１２は、第１閉塞部材１１に固定され且つ第１閉塞部材１１を一方側から覆う部材である。第２閉塞部材１２は、金属材料によって構成された金属加工品（例えば、プレス成型品）であり、板状をなしている（図６、図７参照）。第２閉塞部材１２は、蓋部として機能する。第２閉塞部材１２は、複数の第２溝部６２を有する。第２溝部６２は、溝部の一例に相当し、燃料ガスが入り込む空間を構成する。具体的には、第２閉塞部材１２は、パッキン部材８０に接触する平板状の接触部７２と、パッキン部材８０側とは反対側に膨出する複数の膨出部７４Ａ，７４Ｃと、を有する。複数の膨出部７４Ａ，７４Ｃの各々の内部に第２溝部６２がそれぞれ設けられている。複数の膨出部７４Ａ，７４Ｃの内部の空間が第２空間１０Ｚである。複数の膨出部７４Ａ，７４Ｃの各々を囲む構成で、接触部７２とパッキン部材８０とが密着してなる遮断部１６が構成される。遮断部１６は、燃料ガスが接触部７２とパッキン部材８０との間を通って膨出部７４内から膨出部７４外へ通過することを遮断するように機能する部分である。膨出部７４Ａを囲む構成で、接触部７２とパッキン部材８０とが密着してなる遮断部１６が構成される。同様に、膨出部７４Ｂを囲む構成で、接触部７２とパッキン部材８０とが密着してなる遮断部１６が構成される。 The second closing member 12 is a member that is fixed to the first closing member 11 and covers the first closing member 11 from one side. The second closing member 12 is a metal processed product (for example, a press-molded product) made of a metal material and has a plate shape (see FIGS. 6 and 7). The second closing member 12 functions as a lid. The second closing member 12 has a plurality of second grooves 62 . The second groove portion 62 corresponds to an example of a groove portion, and constitutes a space into which the fuel gas enters. Specifically, the second closing member 12 has a flat plate-like contact portion 72 that contacts the packing member 80, and a plurality of bulging portions 74A and 74C that bulge in the opposite direction to the packing member 80 side. . A second groove portion 62 is provided inside each of the plurality of bulging portions 74A and 74C. The space inside the plurality of bulging portions 74A and 74C is the second space 10Z. The contact portion 72 and the packing member 80 are in close contact with each other to form the blocking portion 16, which surrounds each of the plurality of bulging portions 74A and 74C. The blocking portion 16 is a portion that functions to block fuel gas from passing between the contact portion 72 and the packing member 80 from within the bulging portion 74 to the outside of the bulging portion 74 . The contact portion 72 and the packing member 80 are in close contact with each other to form the blocking portion 16, which surrounds the bulging portion 74A. Similarly, the contact portion 72 and the packing member 80 are in close contact with each other to form the blocking portion 16 surrounding the bulging portion 74B.

図６、図７に示されるパッキン部材８０は、第１閉塞部材１１と第２閉塞部材１２との間に配置される部材であり、ガス分配ユニット１０の内部空間１０Ａを仕切るように区画する部材である。パッキン部材８０は、第１閉塞部材１１と第２閉塞部材１２との間から内部空間１０Ａの外側へ燃料ガスが漏れることを遮断するように密封する機能を有する。 A packing member 80 shown in FIGS. 6 and 7 is a member arranged between the first closing member 11 and the second closing member 12, and is a member that partitions the internal space 10A of the gas distribution unit 10. is. The packing member 80 has a sealing function to prevent fuel gas from leaking from between the first closing member 11 and the second closing member 12 to the outside of the internal space 10A.

図６、図７のように、パッキン部材８０は、ガス流路１８内の内部空間１０Ａ（図８）を第１閉塞部材１１側において燃料ガスが流れる第１空間１０Ｙ（図６）と第２閉塞部材１２側において燃料ガスが流れる第２空間１０Ｚ（図７）とに区画する。 As shown in FIGS. 6 and 7, the packing member 80 includes a first space 10Y (FIG. 6) and a second space 10Y (FIG. 6) through which the fuel gas flows in the internal space 10A (FIG. 8) in the gas flow path 18 on the first closing member 11 side. It is divided into a second space 10Z (FIG. 7) through which the fuel gas flows on the blocking member 12 side.

図６、図７、図９のように、パッキン部材８０は、第１空間１０Ｙと第２空間１０Ｚとの間で燃料ガスを通す孔部８２を複数備える。複数の孔部８２は、導入口３６側に設けられる１以上の第１孔部（８２Ａ，８２Ｍ）と、ノズル３４側に設けられる第２孔部（８２Ｂ，８２Ｃ，８２Ｎ，８２Ｌ）と、を有する。図８のように、第１孔部である孔部８２Ａと第２孔部である孔部８２Ｂ，８２Ｃとの間において第２空間１０Ｚ（具体的には、膨出部７４Ａ内の第２空間１０Ｚ）が続いている。また、第１孔部である孔部８２Ｍと第２孔部である孔部８２Ｎ，８２Ｌとの間において第２空間１０Ｚ（具体的には、膨出部７４Ｃ内の第２空間１０Ｚ）が続いている。パッキン部材８０は、第１溝部４１Ａ，４１Ｃの各内部にそれぞれ構成される第１空間１０Ｙを第２溝部６２Ａ，６２Ｃ内に構成される第２空間１０Ｚと区画するように区画部１３Ａ，１３Ｃを備える。区画部１３Ａは、シート状の被覆部の一例に相当し、重なり部の一例に相当する。区画部１３Ａ，１３Ｃは、ガス供給路（ガス供給路３１）と溝部（第２溝部６２Ａ：図７）とに重なり、膨出部７４Ａにも重なる。区画部１３Ａは、ガス供給路３１（即ち、第１溝部４１Ａ）の内部に構成される第１空間１０Ｙを第２溝部６２Ａ内（膨出部７４Ａ内）に構成される第２空間１０Ｚと区画する。区画部１３Ｃは、重なり部の一例に相当し、ガス供給路（ガス供給路３３）と溝部（第２溝部６２Ｃ：図７）とに重なり、膨出部７４Ｃにも重なる。区画部１３Ｃは、ガス供給路３３（即ち、第１溝部４１Ｃ）の内部に構成される第１空間１０Ｙを第２溝部６２Ｃ内（膨出部７４Ｃ内）に構成される第２空間１０Ｚと区画する。区画部１３Ａ，１３Ｃの各々には、孔部８２が複数ずつ設けられる。 As shown in FIGS. 6, 7, and 9, the packing member 80 has a plurality of holes 82 through which the fuel gas passes between the first space 10Y and the second space 10Z. The plurality of holes 82 include one or more first holes (82A, 82M) provided on the introduction port 36 side and second holes (82B, 82C, 82N, 82L) provided on the nozzle 34 side. have. As shown in FIG. 8, the second space 10Z (specifically, the second space in the expanded portion 74A) is provided between the hole portion 82A as the first hole portion and the hole portions 82B and 82C as the second hole portions. 10Z) continues. A second space 10Z (specifically, a second space 10Z in the expanded portion 74C) continues between the hole portion 82M as the first hole portion and the hole portions 82N and 82L as the second hole portions. ing. The packing member 80 divides the partitions 13A and 13C so as to separate the first space 10Y formed in each of the first grooves 41A and 41C from the second space 10Z formed in the second grooves 62A and 62C. Prepare. 13 A of division parts correspond to an example of a sheet-like covering part, and correspond to an example of an overlapping part. The partitions 13A and 13C overlap the gas supply path (gas supply path 31) and the groove (second groove 62A: FIG. 7), and also overlap the bulging portion 74A. The dividing portion 13A divides the first space 10Y formed inside the gas supply path 31 (that is, the first groove portion 41A) from the second space 10Z formed inside the second groove portion 62A (inside the swelling portion 74A). do. The dividing portion 13C corresponds to an example of an overlapping portion, and overlaps the gas supply path (gas supply path 33) and the groove portion (second groove portion 62C: FIG. 7), and also overlaps the bulging portion 74C. The dividing portion 13C divides the first space 10Y formed inside the gas supply path 33 (that is, the first groove portion 41C) from the second space 10Z formed inside the second groove portion 62C (inside the swelling portion 74C). do. A plurality of holes 82 are provided in each of the partitions 13A and 13C.

このように構成された給湯器１は、湯出口９３の配管に接続される給湯栓を開栓して器具内に通水させると、これを検知したコントローラがガス供給部１１４のガス流路を開いてガス分配ユニット１０へ燃料ガスを供給させると共に、ファン７を作動させて燃焼用空気を供給させる。よって、ガス分配ユニット１０のノズル３４から供給される燃料ガスは、内板１２３の各淡ガス供給孔１２５及び濃ガス供給孔１２６から一次空気と共に各淡側導入口及び濃側導入口を介してインナーケース１２０内の各濃淡バーナに供給される。そして、コントローラにより放電電極が連続放電すると、各濃淡バーナの炎孔部から噴出する混合気が燃焼する。各濃淡バーナでの燃焼で生じた燃焼排気は、給水管１１５から熱交換器４の伝熱管を通過する水と熱交換され、設定温度の湯となって出湯管１１６から出湯される。コントローラは、必要な燃焼量に合わせてガス供給部１１４の電磁弁を作動させてガス入口４８，４８を開閉制御することで、バーナユニットでの濃淡バーナの燃焼本数を三段階に制御する。 In the water heater 1 configured as described above, when the hot water supply valve connected to the piping of the hot water outlet 93 is opened to allow water to flow through the appliance, the controller detects this and opens the gas flow path of the gas supply unit 114. It is opened to supply fuel gas to the gas distribution unit 10 and the fan 7 is operated to supply combustion air. Therefore, the fuel gas supplied from the nozzles 34 of the gas distribution unit 10 is supplied from the lean gas supply holes 125 and the rich gas supply holes 126 of the inner plate 123 together with the primary air through the lean side inlets and the rich side inlets. It is supplied to each dark and light burner in the inner case 120 . When the controller continuously discharges the discharge electrode, the air-fuel mixture ejected from the burner port of each rich-lean burner burns. Combustion exhaust gas generated by combustion in each rich/lean burner is heat-exchanged with water passing through the heat transfer tube of the heat exchanger 4 from the water supply pipe 115 , and turned into hot water at a set temperature and discharged from the hot water discharge pipe 116 . The controller controls the number of rich/lean burners in the burner unit in three steps by opening/closing the gas inlets 48, 48 by operating the electromagnetic valve of the gas supply unit 114 in accordance with the required amount of combustion.

図８に示されるガス分配ユニット１０において、図１０、図１１に示されるように、ガス供給路３１を構成する第１溝部４１から燃料ガスを供給する場合、電磁弁の開放によって導入口３６Ａから第１溝部４１Ａ内にガスが導入される。第１溝部４１Ａの周囲の突条４０は、図９に示されるパッキン部材８０（具体的には区画部１３Ａ）と密着するため、第１溝部４１Ａとパッキン部材８０との間からはガスは漏れない。図１０のように、第１溝部４１Ａは、幅の狭い溝である誘導通路（誘導溝）５１Ａと、幅の広い溝であるガス分配室（分配溝）５１Ｂとを備えている。ガス分配室５１Ｂは、複数のノズル３４が配置される溝である。誘導通路５１Ａは、ガス分配室５１Ｂの上流側に配置されるとともにガス分配室５１Ｂにガスを排出する出口５７Ｃを有する溝であり、ガス分配室５１Ｂに燃料ガスを導く経路である。図１１に示される矢印Ｆ１のように誘導通路５１Ａを流れた燃焼ガスは、ガス分配室５１Ｂにおいて左右方向一方側の領域（図１１の例では、右側の領域ＡＲ１）に多く流れ込むようになっている。これだけでは、左右方向他方側の領域ＡＲ２へ十分な燃焼ガスが供給されない懸念があるが、図９に示されるように、重なり部に相当する区画部１３Ａに複数の孔部８２Ａ，８２Ｂ，８２Ｃが設けられ、孔部８２Ａを介して第２空間１０Ｚ（具体的には膨出部７４Ａの内部の空間：図７参照）に流れ込んだ燃焼ガスが、この空間を流れて孔部８２Ｃから第１空間１０Ｙ（具体的には第１溝部４１Ａ内の領域ＡＲ２付近：図１１参照）に供給されるようになっている。孔部８２Ａ，８２Ｂ，８２Ｃは、ガス供給路３１内の空間と第２溝部６２Ａ内の空間とを連通する孔部である。孔部８２Ａ，８２Ｂは、上流側孔部の一例に相当し、誘導通路５１Ａ内の空間と第２溝部６２Ａ内の空間とに連通する。孔部８２Ｃは、下流側孔部の一例に相当し、ガス分配室５１Ｂ内の空間と第２溝部６２Ａ内の空間とに連通する。第２溝部６２Ａ（溝部）は、孔部８２Ａ，８２Ｂ（上流側孔部）から孔部８２Ｃ（下流側孔部）へと燃料ガスが流れる構成をなし、第２溝部６２Ａ内を孔部８２Ｃに向かって流れた燃料ガスは、第２溝部６２Ａからガス分配室５１Ｂの領域ＡＲ２（図１１）付近に供給される。このような構成であるため、図１１に示される矢印Ｆ１のような流れでは供給されにくい領域ＡＲ２に対して燃焼ガスを良好に供給することができ、より均一に分散させることができる。 In the gas distribution unit 10 shown in FIG. 8, as shown in FIGS. 10 and 11, when the fuel gas is supplied from the first groove portion 41 forming the gas supply passage 31, the opening of the electromagnetic valve causes the fuel gas to flow from the introduction port 36A. Gas is introduced into the first groove portion 41A. Since the ridge 40 around the first groove portion 41A is in close contact with the packing member 80 (specifically, the partition portion 13A) shown in FIG. do not have. As shown in FIG. 10, the first groove portion 41A includes a guide passage (guide groove) 51A, which is a narrow groove, and a gas distribution chamber (distribution groove) 51B, which is a wide groove. The gas distribution chamber 51B is a groove in which a plurality of nozzles 34 are arranged. The guide passage 51A is a groove that is arranged upstream of the gas distribution chamber 51B and has an outlet 57C that discharges gas to the gas distribution chamber 51B, and is a route that guides the fuel gas to the gas distribution chamber 51B. The combustion gas that has flowed through the guide passage 51A as indicated by the arrow F1 in FIG. 11 flows more into the region on one side in the left-right direction (in the example of FIG. 11, the region AR1 on the right side) in the gas distribution chamber 51B. there is With this alone, there is a concern that a sufficient amount of combustion gas may not be supplied to the area AR2 on the other side in the left-right direction. However, as shown in FIG. The combustion gas that has flowed into the second space 10Z (specifically, the space inside the bulging portion 74A: see FIG. 7) through the hole 82A flows through this space and flows from the hole 82C into the first space. 10Y (specifically, near the area AR2 in the first groove portion 41A: see FIG. 11). The holes 82A, 82B, and 82C are holes that communicate the space within the gas supply path 31 and the space within the second groove portion 62A. The holes 82A and 82B correspond to an example of an upstream hole, and communicate with the space inside the guide passage 51A and the space inside the second groove portion 62A. The hole portion 82C corresponds to an example of a downstream hole portion, and communicates with the space within the gas distribution chamber 51B and the space within the second groove portion 62A. The second groove portion 62A (groove portion) is configured such that the fuel gas flows from the hole portions 82A and 82B (upstream side hole portions) to the hole portion 82C (downstream side hole portion). The fuel gas flowing toward is supplied from the second groove portion 62A to the vicinity of the area AR2 (FIG. 11) of the gas distribution chamber 51B. With such a configuration, the combustion gas can be well supplied to the region AR2, which is difficult to be supplied by the flow indicated by the arrow F1 shown in FIG. 11, and can be dispersed more uniformly.

具体的には、図１０のように、誘導通路５１Ａは、ガス分配室５１Ｂに向かって直線状に延びる２つの内壁部５７Ａ，５７Ｂが対向して配置される。図９のように、区画部１３Ａにおいて、２つの直線状の内壁部５７Ａ，５７Ｂの間の壁部間領域及び当該壁部間領域をガス分配室５１Ｂ側に延長した延長領域から外れた領域には、下流側の孔部８２Ｃの全部が配置されている。直線状の内壁部５７Ａ，５７Ｂの間を流れる燃料ガスは、出口５７Ｃからガス分配室５１Ｂにおける右側の領域に向かうように排出される。なお、ここでは、区画部１３Ａのうちのガス分配室５１Ｂを塞ぐ領域において、内壁部５７Ａ，５７Ｂの各壁面をそれぞれを延長した延長面Ｌ１，Ｌ２の間の領域が上記延長領域であり、出口５７Ｃから排出される燃料ガスはこの延長領域付近に集まりやすくなっている。 Specifically, as shown in FIG. 10, the guide passage 51A has two inner walls 57A and 57B that extend linearly toward the gas distribution chamber 51B so as to face each other. As shown in FIG. 9, in the partition portion 13A, the inter-wall region between the two linear inner wall portions 57A and 57B and the region outside the extension region extending the inter-wall region toward the gas distribution chamber 51B side. , all of the holes 82C on the downstream side are arranged. The fuel gas flowing between the straight inner wall portions 57A and 57B is discharged from the outlet 57C toward the right region of the gas distribution chamber 51B. Here, in the region of the partition portion 13A that closes the gas distribution chamber 51B, the region between the extension surfaces L1 and L2 obtained by extending the respective wall surfaces of the inner wall portions 57A and 57B is the extension region. The fuel gas discharged from 57C tends to gather near this extension area.

同様に、図１０、図１１に示されるように、ガス供給路３３を構成する第１溝部４１Ｃから燃料ガスを供給する場合、電磁弁の開放によって導入口３６Ｃから第１溝部４１Ｃ内にガスが導入される。第１溝部４１Ｃの周囲の突条４０は、図９に示されるパッキン部材８０（具体的には区画部１３Ｃ）と密着するため、第１溝部４１Ｃとパッキン部材８０との間からはガスは漏れない。図１１のように、第１溝部４１Ｃは、幅の狭い溝である誘導通路（誘導溝）５３Ａと、幅の広い溝であるガス分配室（分配溝）５３Ｂとを備えている。ガス分配室５３Ｂは、複数のノズル３４が配置される溝である。誘導通路５３Ａは、ガス分配室５３Ｂの上流側に配置されるとともにガス分配室５３Ｂにガスを排出する出口を有する溝であり、ガス分配室５３Ｂに燃料ガスを導く経路である。矢印Ｆ２のように誘導通路５３Ａを流れた燃焼ガスは、ガス分配室５３Ｂにおいて左右方向他方側の領域（図１１の例では、左側の領域ＡＲ３）に多く流れ込むようになっている。これだけでは、左右方向一方側の領域ＡＲ４へ十分な燃焼ガスが供給されない懸念があるが、図９に示されるように、重なり部に相当する区画部１３Ｃに複数の孔部８２Ｍ，８２Ｎ，８２Ｌが設けられ、例えば、孔部８２Ｍを介して第２空間１０Ｚ（具体的には膨出部７４Ｃの内部の空間）に流れ込んだ燃焼ガスが、この空間を流れて孔部８２Ｌから第１空間１０Ｙ（具体的には第１溝部４１Ｃ内の領域ＡＲ４付近）に供給されるようになっている。孔部８２Ｍ，８２Ｎ，８２Ｌは、ガス供給路３３内の空間と第２溝部６２Ｃ内の空間とを連通する孔部である。孔部８２Ｍ，８２Ｎは、上流側孔部の一例に相当し、誘導通路５３Ａ内の空間と第２溝部６２Ｃ内の空間とに連通する。孔部８２Ｌは、下流側孔部の一例に相当し、ガス分配室５３Ｂ内の空間と第２溝部６２Ｃ内の空間とに連通する。第２溝部６２Ｃ（溝部）は、孔部８２Ｍ，８２Ｎ（上流側孔部）から孔部８２Ｌ（下流側孔部）へと燃料ガスが流れる構成をなし、第２溝部６２Ｃ内を孔部８２Ｌに向かって流れた燃料ガスは、第２溝部６２Ｃからガス分配室５３Ｂの領域ＡＲ４付近に供給される。このような構成であるため、矢印Ｆ２のような流れでは供給されにくい領域ＡＲ４に対して燃焼ガスを良好に供給することができ、より均一に分散させることができる。 Similarly, as shown in FIGS. 10 and 11, when the fuel gas is supplied from the first groove portion 41C forming the gas supply passage 33, the opening of the solenoid valve causes the gas to flow from the introduction port 36C into the first groove portion 41C. be introduced. Since the protrusion 40 around the first groove portion 41C is in close contact with the packing member 80 (specifically, the partition portion 13C) shown in FIG. do not have. As shown in FIG. 11, the first groove portion 41C includes a guide passage (guide groove) 53A, which is a narrow groove, and a gas distribution chamber (distribution groove) 53B, which is a wide groove. The gas distribution chamber 53B is a groove in which multiple nozzles 34 are arranged. The guide passage 53A is a groove that is arranged upstream of the gas distribution chamber 53B and has an outlet for discharging gas into the gas distribution chamber 53B, and is a route that guides the fuel gas to the gas distribution chamber 53B. A large amount of the combustion gas that has flowed through the guide passage 53A as indicated by arrow F2 flows into the area on the other side in the left-right direction (in the example of FIG. 11, the area AR3 on the left side) in the gas distribution chamber 53B. With this alone, there is a concern that a sufficient amount of combustion gas may not be supplied to the area AR4 on one side in the left-right direction. However, as shown in FIG. For example, the combustion gas that has flowed into the second space 10Z (specifically, the space inside the bulging portion 74C) through the hole 82M flows through this space and flows from the hole 82L into the first space 10Y ( Specifically, it is supplied to the vicinity of the area AR4 in the first groove portion 41C. The holes 82M, 82N, and 82L are holes that communicate the space within the gas supply path 33 and the space within the second groove portion 62C. The holes 82M and 82N correspond to an example of upstream holes, and communicate with the space within the guide passage 53A and the space within the second groove portion 62C. The hole portion 82L corresponds to an example of a downstream hole portion, and communicates with the space inside the gas distribution chamber 53B and the space inside the second groove portion 62C. The second groove portion 62C (groove portion) has a configuration in which fuel gas flows from the holes 82M and 82N (upstream side hole portions) to the hole portion 82L (downstream side hole portion). The fuel gas flowing toward is supplied from the second groove portion 62C to the vicinity of the area AR4 of the gas distribution chamber 53B. With such a configuration, the combustion gas can be well supplied to the region AR4, which is difficult to be supplied by the flow shown by the arrow F2, and can be dispersed more uniformly.

具体的には、図１０のように、誘導通路５３Ａは、ガス分配室５３Ｂ側に向かって直線状に延びる２つの内壁部５７Ａ，５７Ｂが対向して配置される。図９のように、区画部１３Ｃにおいて、２つの直線状の内壁部５９Ａ，５９Ｂの間の壁部間領域及び当該壁部間領域をガス分配室５３Ｂ側に延長した延長領域から外れた領域には、下流側の孔部８２Ｌの全部が配置されている。直線状の内壁部５９Ａ，５９Ｂの間を流れる燃料ガスは、出口５９Ｃからガス分配室５３Ｂにおける左側の領域に向かうように排出される。なお、ここでは、区画部１３Ｃのうちのガス分配室５３Ｂを塞ぐ領域において、内壁部５９Ａ，５９Ｂの各壁面をそれぞれを延長した延長面Ｌ４，Ｌ３の間の領域が上記延長領域であり、出口５９Ｃから排出される燃料ガスはこの延長領域付近に集まりやすくなっている。 Specifically, as shown in FIG. 10, the guide passage 53A has two inner wall portions 57A and 57B that extend linearly toward the gas distribution chamber 53B side and are arranged to face each other. As shown in FIG. 9, in the partition portion 13C, the inter-wall region between the two linear inner wall portions 59A and 59B and the region outside the extension region extending the inter-wall region toward the gas distribution chamber 53B side. , all of the holes 82L on the downstream side are arranged. The fuel gas flowing between the straight inner walls 59A and 59B is discharged from the outlet 59C toward the left area of the gas distribution chamber 53B. Here, in the region of the partition portion 13C that closes the gas distribution chamber 53B, the region between the extension surfaces L4 and L3 obtained by extending the respective wall surfaces of the inner wall portions 59A and 59B is the extension region. The fuel gas discharged from 59C tends to gather near this extended area.

図１０、図１１に示されるガス供給路３２から燃料ガスを供給する場合、電磁弁の開放によって導入口３６Ｂから第１溝部４１Ｂ内にガスが導入される。図８～図１１の例では、第２閉塞部材１２において第１溝部４１Ｂを覆う位置には膨出部が設けられていない。従って、第１溝部４１Ｂに供給された燃焼ガスは、ほとんど第２空間１０Ｚに入り込まずに幅の狭い誘導通路（誘導溝）５２Ａ，５２Ｂを通って幅の広いガス分配室（分配溝）５２Ｃに流れ込む。この構成だけでは流れの停滞を招く懸念があるが、パッキン部材８０には、孔部８２Ｅ，８２Ｆ，８２Ｇ，８２Ｈ，８２Ｊが設けられているため、誘導通路５２Ａ，５２Ｂの溝サイズが拡張され、流れの円滑化が図られる。図１０、図１１の構成では、ガス分配室５２Ｃに設けられるノズル３４の数が、ガス分配室５１Ｂ，５３Ｂに設けられるノズル３４の数よりも少なくなっており、燃料ガスをガス分配室５２Ｃに供給する供給速度は、燃料ガスをガス分配室５１Ｂ，５３Ｂに供給する供給速度よりも抑えることができるようになっている。従って、図８のような構成（第２閉塞部材１２において第１溝部４１Ｂを覆う位置に膨出部が設けられない構成）によって図１０に示されるガス分配室５２Ｃに流れ込む燃料ガスの流量が相対的に抑えられても、相対的に数の少ないノズル３４から適度に排出できる流量で供給されれば支障はない。 When fuel gas is supplied from the gas supply passage 32 shown in FIGS. 10 and 11, the gas is introduced into the first groove portion 41B from the introduction port 36B by opening the electromagnetic valve. In the examples of FIGS. 8 to 11, the second closing member 12 is not provided with a bulging portion at a position covering the first groove portion 41B. Therefore, the combustion gas supplied to the first groove portion 41B hardly enters the second space 10Z and passes through the narrow guide passages (guide grooves) 52A and 52B to the wide gas distribution chamber (distribution groove) 52C. flow in. Although there is a concern that this structure alone may cause flow stagnation, since the packing member 80 is provided with the holes 82E, 82F, 82G, 82H, and 82J, the groove sizes of the guide passages 52A and 52B are expanded, Smooth flow is achieved. 10 and 11, the number of nozzles 34 provided in the gas distribution chamber 52C is smaller than the number of nozzles 34 provided in the gas distribution chambers 51B and 53B, and the fuel gas is supplied to the gas distribution chamber 52C. The supply speed of the fuel gas can be made lower than the supply speed of supplying the fuel gas to the gas distribution chambers 51B and 53B. Therefore, the flow rate of the fuel gas flowing into the gas distribution chamber 52C shown in FIG. Even if it is suppressed to a certain extent, there is no problem if it is supplied at a flow rate that can be appropriately discharged from the relatively small number of nozzles 34 .

図１０、図１１の例では、３つのガス分配室５１Ｂ，５２Ｃ，５３Ｂが横並びに配置されている。３つのガス分配室５１Ｂ，５２Ｃ，５３Ｂのうち、横方向両端にそれぞれ配置されるガス分配室５１Ｂ，５３Ｂが両端分配室の一例に相当し、横方向中央側（即ち、両側の両端分配室の間）に配置されるガス分配室５２Ｃが中央側分配室の一例に相当する。そして、両端分配室であるガス分配室５１Ｂ，５３Ｂの各々は、中央側分配室であるガス分配室５２Ｃよりもノズルの数よりも多い。更に、両端分配室であるガス分配室５１Ｂ，５３Ｂの各々は、中央側分配室であるガス分配室５２Ｃよりも内部空間が広い（即ち、内部空間の体積が大きい）。 In the examples of FIGS. 10 and 11, three gas distribution chambers 51B, 52C and 53B are arranged side by side. Of the three gas distribution chambers 51B, 52C, and 53B, the gas distribution chambers 51B and 53B arranged at both ends in the horizontal direction correspond to an example of the both-end distribution chambers, and the central side in the horizontal direction (that is, the two end distribution chambers on both sides). 52C of gas distribution chambers arranged in (between) correspond to an example of a center side distribution chamber. Each of the gas distribution chambers 51B and 53B, which are both end distribution chambers, has a larger number of nozzles than the gas distribution chamber 52C, which is the central distribution chamber. Furthermore, each of the gas distribution chambers 51B and 53B, which are both end distribution chambers, has a wider internal space than the gas distribution chamber 52C, which is the center side distribution chamber (that is, the volume of the internal space is larger).

本実施形態では、パッキン部材８０は、複数のガス供給路３０のうちの少なくともいずれかの過半領域を覆うように配置される。具体的には、両端分配室の一つであるガス分配室５１Ｂを含むガス供給路３１の過半領域は、パッキン部材８０によって覆われる。両端分配室の一つであるガス分配室５３Ｂを含むガス供給路３３の過半領域も、パッキン部材８０によって覆われる。パッキン部材８０において、両端分配室を含むガス供給路３１，３３を覆う各部分（具体的には、重なり部である区画部１３Ａ，１３Ｃ）は、シート状に構成される。具体的には、区画部１３Ａは、区画部１３Ａに重なるガス供給路３１の過半領域を覆う構成でシート状に設けられる。区画部１３Ｃは、区画部１３Ｃに重なるガス供給路３３の過半領域を覆う構成でシート状に設けられる。 In this embodiment, the packing member 80 is arranged so as to cover a majority region of at least one of the plurality of gas supply paths 30 . Specifically, the majority region of the gas supply path 31 including the gas distribution chamber 51B, which is one of the distribution chambers at both ends, is covered with the packing member 80 . A majority region of the gas supply path 33 including the gas distribution chamber 53B, which is one of the distribution chambers on both ends, is also covered with the packing member 80. As shown in FIG. In the packing member 80, each portion covering the gas supply paths 31 and 33 including the both end distribution chambers (specifically, the partition portions 13A and 13C which are overlapping portions) is configured in a sheet shape. Specifically, the partition portion 13A is provided in a sheet shape so as to cover the majority region of the gas supply path 31 overlapping the partition portion 13A. 13 C of division parts are provided in the shape of a sheet by the structure which covers the majority area|region of the gas supply path 33 which overlaps with 13 C of division parts.

一方で、中央側分配室の一つであるガス分配室５２Ｃを含むガス供給路５２の過半領域は、パッキン部材８０によって覆われない。具体的には、図１０に示されるガス分配室５１Ｂ，５３Ｂ（両端分配室）を含むガス供給路３１，３３を、図９のように区画部１３Ａ，１３Ｃ（シート状の被覆部）がそれぞれ覆い、ガス分配室５１Ｂ（一方の両端分配室）を覆うシート状の区画部１３Ａとガス分配室５３Ｂ（他方の両端分配室）を覆うシート状の区画部１３Ｃとを連結する構成で連結部１３Ｄ，１３Ｅ，１３Ｆが設けられる。そして、図１０に示されるガス分配室５２Ｃ（中央側分配室）を含むガス供給路５２を覆う部分は、図９のようにガス供給路３２に沿って複数の長孔（具体的には、孔部８２Ｅ，８２Ｆ，８２Ｇ，８２Ｈ）が並んだ構成をなす。連結部１３Ｄ，１３Ｅ，１３Ｆは、中央側分配室を含むガス供給路３２に面しつつ架設されている。連結部１３Ｄ，１３Ｅ，１３Ｆは、ガス供給路３２に沿って設けられる複数の長孔（孔部８２Ｅ，８２Ｆ，８２Ｇ，８２Ｈ）を仕切る構成をなす。孔部８２Ｅ，８２Ｆ，８２Ｇ，８２Ｈは、開口部の一例に相当し、連結部１３Ｄ，１３Ｅ，１３Ｆの各々の両側には、開口部の開口領域が構成される。連結部１３Ｄの両側には、孔部８２Ｅ，８２Ｆのそれぞれの開口領域（開口空間）が構成される。連結部１３Ｅの両側には、孔部８２Ｆ，８２Ｇのそれぞれの開口領域（開口空間）が構成される。連結部１３Ｆの両側には、孔部８２Ｇ，８２Ｈのそれぞれの開口領域（開口空間）が構成される。開口部（孔部８２Ｅ，８２Ｆ，８２Ｇ，８２Ｈ）の各々の開口領域は、ガス供給路３２内の空間から続く領域であり、ガス供給路３２内の空間から燃料ガスが入り込む空間である。 On the other hand, the packing member 80 does not cover the majority of the gas supply passage 52 including the gas distribution chamber 52</b>C, which is one of the central distribution chambers. Specifically, gas supply paths 31 and 33 including gas distribution chambers 51B and 53B (both end distribution chambers) shown in FIG. The sheet-like partition 13A covering the gas distribution chamber 51B (one end distribution chamber) and the sheet-like partition 13C covering the gas distribution chamber 53B (the other end distribution chamber) are connected by a connecting portion 13D. , 13E and 13F are provided. The portion covering the gas supply path 52 including the gas distribution chamber 52C (central side distribution chamber) shown in FIG. Holes 82E, 82F, 82G, 82H) are arranged side by side. The connecting portions 13D, 13E, and 13F are constructed so as to face the gas supply passage 32 including the central distribution chamber. The connecting portions 13D, 13E, and 13F are configured to partition a plurality of long holes (hole portions 82E, 82F, 82G, and 82H) provided along the gas supply path 32. As shown in FIG. The holes 82E, 82F, 82G, and 82H correspond to an example of openings, and opening regions of the openings are formed on both sides of each of the connecting portions 13D, 13E, and 13F. Opening regions (opening spaces) of the holes 82E and 82F are formed on both sides of the connecting portion 13D. Opening regions (opening spaces) of the holes 82F and 82G are formed on both sides of the connecting portion 13E. Opening regions (opening spaces) of the holes 82G and 82H are formed on both sides of the connecting portion 13F. Each opening region of the openings (holes 82E, 82F, 82G, 82H) is a region that continues from the space in gas supply path 32 and is a space into which fuel gas enters from the space in gas supply path 32. As shown in FIG.

３．効果の例
ガス分配ユニット１０では、ガス流路は、第１閉塞部材１１に設けられる複数のガス供給路３１，３２，３３を備え、ガス供給路３１，３２，３３の各々は、複数のノズル３４が設けられるガス分配室と、ガス分配室の上流側においてガス分配室に燃料ガスを導く経路である誘導通路と、を有している。パッキン部材８０は、少なくともいずれかのガス供給路を覆うシート状の被覆部（区画部１３Ａ，１３Ｃ）を有する。 3. Example of Effect In the gas distribution unit 10, the gas flow path includes a plurality of gas supply paths 31, 32, 33 provided in the first closing member 11, and each of the gas supply paths 31, 32, 33 includes a plurality of nozzles. 34, and a guide passage, which is a path for guiding fuel gas to the gas distribution chamber on the upstream side of the gas distribution chamber. The packing member 80 has sheet-like covering portions (partition portions 13A and 13C) that cover at least one of the gas supply passages.

ガス分配ユニット１０では、パッキン部材８０は、少なくともいずれかのガス供給路を覆うシート状の被覆部（区画部１３Ａ，１３Ｃ）を有するため、シート状の被覆部（区画部１３Ａ，１３Ｃ）付近において強度が高められ、パッキン部材８０にねじれ等の変形が生じることを抑えることができる。 In the gas distribution unit 10, the packing member 80 has a sheet-like covering portion (partitioned portions 13A, 13C) covering at least one of the gas supply passages. The strength is increased, and deformation such as twisting of the packing member 80 can be suppressed.

ガス分配ユニット１０では、ガス分配室５１Ｂ，５２Ｃ，５３Ｂが横並びに配置され、ガス分配室５１Ｂ，５２Ｃ，５３Ｂにおいて、横方向中央側に配置されるガス分配室５２Ｃ（中央側分配室）は、横方向両端にそれぞれ配置されるガス分配室５１Ｂ，５３Ｂ（両端分配室）よりもノズル３４の数が少ない。パッキン部材８０は、ガス分配室５１Ｂ，５３Ｂ（両端分配室）を含むガス供給路３１，３３を区画部１３Ａ，１３Ｃ（シート状の被覆部）が覆い、一方の両端分配室を覆う区画部１３Ａと他方の両端分配室を区画部１３Ａとを連結する連結部１３Ｄ，１３Ｅ，１３Ｆを備える。連結部１３Ｄ，１３Ｅ，１３Ｆは、ガス分配室５２Ｃ（中央側分配室）を含むガス供給路３２に面しつつ架設されている。 In the gas distribution unit 10, the gas distribution chambers 51B, 52C, and 53B are arranged side by side, and among the gas distribution chambers 51B, 52C, and 53B, the gas distribution chamber 52C (central side distribution chamber) arranged on the laterally central side is The number of nozzles 34 is smaller than that of the gas distribution chambers 51B and 53B (both end distribution chambers) arranged at both ends in the horizontal direction. In the packing member 80, the gas supply paths 31 and 33 including the gas distribution chambers 51B and 53B (distribution chambers at both ends) are covered with the partition portions 13A and 13C (sheet-like covering portions), and the partition portion 13A covers one of the distribution chambers at both ends. and connecting portions 13D, 13E, and 13F connecting the partitioning portion 13A and the other end distribution chamber. The connecting portions 13D, 13E, and 13F are constructed facing the gas supply path 32 including the gas distribution chamber 52C (central side distribution chamber).

パッキン部材８０において、ガス供給路３１，３２，３３を覆う領域を広く確保しすぎると、圧損が高まり、ガス供給が不均一になる懸念がある。この点に関し、ガス分配ユニット１０は、中央側分配室を含むガス供給路３２に面しつつ架設されるように連結部１３Ｄ，１３Ｅ，１３Ｆが設けられ、連結部１３Ｄ，１３Ｅ，１３Ｆの両側に開口領域が構成されるため、圧損を効果的に抑えることができる。一方で、ガス分配ユニット１０は、両端分配室を含むガス供給路３１，３３の各々を覆う構成でシート状の被覆部（区画部１３Ａ，１３Ｃ）が設けられるため、横方向両側の広い領域において強度を高めることができ、ねじれ等の変形をより一層抑制しやすい。 If the area covering the gas supply paths 31, 32, and 33 is secured too wide in the packing member 80, there is a concern that the pressure loss will increase and the gas supply will become non-uniform. Regarding this point, the gas distribution unit 10 is provided with connecting portions 13D, 13E, and 13F so as to face the gas supply passage 32 including the central distribution chamber, and the connecting portions 13D, 13E, and 13F are provided on both sides of the connecting portions. Since the opening region is configured, the pressure loss can be effectively suppressed. On the other hand, since the gas distribution unit 10 is provided with sheet-like covering portions (partitions 13A and 13C) covering each of the gas supply paths 31 and 33 including both end distribution chambers, wide regions on both sides in the lateral direction are Strength can be increased, and deformation such as twisting can be more easily suppressed.

ガス分配ユニット１０では、パッキン部材８０において、一方の両端分配室（ガス分配室５１Ｂ）を含むガス供給路３１を覆う部分、及び、他方の両端分配室（ガス分配室５３Ｂ）を含むガス供給路３３を覆う部分は、いずれもシート状に構成されている。そして、パッキン部材８０において、中央側分配室（ガス分配室５２Ｂ）を含むガス供給路３２を覆う部分は、ガス供給路３２に沿って複数の長孔（孔部８２Ｅ，８２Ｆ，８２Ｇ，８２Ｈ）が並んだ構成をなす。このように、ガス分配ユニット１０は、パッキン部材８０において両端分配室を含むガス供給路３１，３３を覆う部分がシート状に構成されるため、横方向両側の広い領域において強度を高めることができ、ねじれ等の変形をより一層抑制しやすい。一方で、パッキン部材８０において中央側分配室を含むガス供給路３２付近は、当該ガス供給路３２に沿った長孔（孔部８２Ｅ，８２Ｆ，８２Ｇ，８２Ｈ）が並んだ構成をなすため、圧損が抑えられ、長孔の利用によって燃料ガスがより円滑に流れやすい。 In the gas distribution unit 10, the packing member 80 has a portion covering the gas supply path 31 including one end distribution chamber (gas distribution chamber 51B) and a gas supply path including the other end distribution chamber (gas distribution chamber 53B). All the parts covering 33 are formed in a sheet shape. A portion of the packing member 80 that covers the gas supply path 32 including the central distribution chamber (gas distribution chamber 52B) has a plurality of elongated holes (holes 82E, 82F, 82G, 82H) along the gas supply path 32. are arranged side by side. As described above, in the gas distribution unit 10, the portions of the packing member 80 that cover the gas supply paths 31 and 33 including the distribution chambers at both ends are formed in a sheet shape, so that the strength can be increased in wide regions on both sides in the lateral direction. , deformation such as torsion can be more easily suppressed. On the other hand, the vicinity of the gas supply passage 32 including the central distribution chamber in the packing member 80 has a configuration in which elongated holes (holes 82E, 82F, 82G, 82H) are arranged along the gas supply passage 32, so pressure loss is suppressed, and the use of long holes facilitates the smooth flow of fuel gas.

ガス分配ユニット１０は、第１閉塞部材１１に設けられたガス供給路３１，３３内の空間と第２閉塞部材１２に設けられた溝部（第２溝部６２）内の空間とを重なり部（区画部１３Ａ，１３Ｃ）によって仕切ることができるため、第１閉塞部材１１側と第２閉塞部材１２側とに分流するような流路を構成することができる。しかも、重なり部（区画部１３Ａ，１３Ｃ）は、ガス供給路３１，３３を覆う構成でシート状に設けられるため、ガス供給路３１，３３内の空間と第２閉塞部材１２の溝部（第２溝部６２）内の空間との独立性が高まり、各々の空間で他の空間の影響を抑えた流れを生じさせることができる。更に、このガス分配ユニット１０は、第２閉塞部材１２の溝部（第２溝部６２）を介してバイパスさせる構成で下流側孔部から上流側孔部に向かうようにガス分配室へと燃料ガスを導く経路を確保することができる。よって、ガス供給路３１，３３の各々において、ガス供給路の流れに起因するガス分配室への排出とバイパス経路に起因するガス分配室への排出とによって流れ込みが調整される。 The gas distribution unit 10 divides the space in the gas supply paths 31 and 33 provided in the first closing member 11 and the space in the groove portion (the second groove portion 62) provided in the second closing member 12 into overlapping portions (partitions). Since it can be partitioned by the portions 13A and 13C), it is possible to construct a flow path that divides the flow into the first closing member 11 side and the second closing member 12 side. Moreover, since the overlapping portions (partitioning portions 13A and 13C) are provided in a sheet-like configuration so as to cover the gas supply paths 31 and 33, the space in the gas supply paths 31 and 33 and the groove portion (second closing member 12) of the second closing member 12 (second The independence from the space in the groove portion 62) is enhanced, and a flow can be generated in each space while suppressing the influence of other spaces. Furthermore, the gas distribution unit 10 is configured such that the fuel gas is bypassed through the groove (the second groove 62) of the second closing member 12 so that the fuel gas is directed from the downstream side hole toward the upstream side hole into the gas distribution chamber. You can secure a route to lead. Therefore, in each of the gas supply channels 31 and 33, the inflow is adjusted by the discharge to the gas distribution chamber caused by the flow of the gas supply channel and the discharge to the gas distribution chamber caused by the bypass route.

＜他の実施形態＞
本発明は、上記記述及び図面によって説明した実施形態に限定されるものではない。例えば、上述又は後述の実施形態の特徴は、矛盾しない範囲であらゆる組み合わせが可能である。また、上述又は後述の実施形態のいずれの特徴も、必須のものとして明示されていなければ省略することもできる。さらに、上述された実施形態は、次のように変更されてもよい。 <Other embodiments>
The invention is not limited to the embodiments illustrated by the above description and drawings. For example, the features of the embodiments described above or below can be combined in any consistent manner. Also, any feature of the embodiments described above or below may be omitted if not explicitly indicated as essential. Furthermore, the embodiments described above may be modified as follows.

上記実施形態では、第１溝部４１が３つ設けられていたが、２つであってもよく、４以上であってもよい。例えば、３以上のガス分配室が横並びに配置され、各々のガス分配室の上流側に誘導通路が設けられていてもよい。 Although three first grooves 41 are provided in the above embodiment, the number may be two, or four or more. For example, three or more gas distribution chambers may be arranged side by side, and a guide passage may be provided upstream of each gas distribution chamber.

上記実施形態では、中央側分配室（ガス分配室５２Ｃ）を含むガス供給路（ガス供給路３２）の過半領域がパッキン部材８０によって覆われない構成であったが、ガス供給路３２）の過半領域がパッキン部材８０によって覆われていてもよい。 In the above-described embodiment, the packing member 80 does not cover the majority of the gas supply path (gas supply path 32) including the central distribution chamber (gas distribution chamber 52C). A region may be covered by the packing member 80 .

上記実施形態では、第１溝部４１Ａ，４１Ｃに対応する位置に膨出部が設けられていたが、第１溝部４１Ｂに対応する位置に膨出部が設けられていてもよい。 In the above embodiment, the bulging portions are provided at the positions corresponding to the first grooves 41A and 41C, but the bulging portions may be provided at the positions corresponding to the first grooves 41B.

なお、今回開示された実施の形態は全ての点で例示であって制限的なものではないと考えられるべきである。本発明の範囲は、今回開示された実施の形態に限定されるものではなく、特許請求の範囲によって示された範囲内又は特許請求の範囲と均等の範囲内での全ての変更が含まれることが意図される。 It should be noted that the embodiments disclosed this time should be considered as examples in all respects and not restrictive. The scope of the present invention is not limited to the embodiments disclosed this time, and includes all modifications within the scope indicated by the claims or within the scope equivalent to the claims. is intended.

１：給湯器
１０：ガス分配ユニット
１１：第１閉塞部材
１２：第２閉塞部材
１３Ａ：区画部（シート状の被覆部、重なり部）
１３Ｃ：区画部（シート状の被覆部、重なり部）
１８：ガス流路
３１：ガス供給路
３２：ガス供給路
３３：ガス供給路
３４：ノズル
３６：導入口
５１Ａ：誘導通路
５１Ｂ：ガス分配室（両端分配室）
５２Ａ：誘導通路
５２Ｂ：誘導通路
５２Ｃ：ガス分配室（中央側分配室）
５３Ａ：誘導通路
５３Ｂ：ガス分配室（両端分配室）
６２：第２溝部（溝部）
８０：パッキン部材
８２Ａ：孔部（上流側孔部）
８２Ｂ：孔部（上流側孔部）
８２Ｃ：孔部（下流側孔部）
８２Ｅ：孔部（開口部、長孔）
８２Ｆ：孔部（開口部、長孔）
８２Ｇ：孔部（開口部、長孔）
８２Ｈ：孔部（開口部、長孔）
８２Ｍ：孔部（上流側孔部）
８２Ｎ：孔部（上流側孔部）
８２Ｌ：孔部（下流側孔部） Reference Signs List 1: water heater 10: gas distribution unit 11: first closing member 12: second closing member 13A: partition (sheet-like covering portion, overlapping portion)
13C: Partitioning part (sheet-like covering part, overlapping part)
18 : Gas flow path 31 : Gas supply path 32 : Gas supply path 33 : Gas supply path 34 : Nozzle 36 : Inlet port 51A : Guide path 51B : Gas distribution chamber (end distribution chamber)
52A: Guidance passage 52B: Guidance passage 52C: Gas distribution chamber (central side distribution chamber)
53A: Guide passage 53B: Gas distribution chamber (both ends distribution chamber)
62: Second groove (groove)
80: packing member 82A: hole (upstream hole)
82B: hole (upstream hole)
82C: hole (downstream hole)
82E: hole (opening, long hole)
82F: hole (opening, long hole)
82G: hole (opening, long hole)
82H: hole (opening, long hole)
82M: hole (upstream hole)
82N: hole (upstream hole)
82L: hole (downstream hole)

Claims

A gas distribution unit for use in a water heater, comprising a gas flow path through which fuel gas flows,
a first closing member having an inlet for introducing the fuel gas from the outside of the gas flow path, and a plurality of nozzles;
a second closing member fixed to the first closing member and covering the first closing member from one side;
a packing member disposed between the first closing member and the second closing member;
with
the gas flow path includes a plurality of gas supply paths provided in the first closing member;
each of the gas supply paths has a gas distribution chamber in which a plurality of the nozzles are provided; and a guide passage, which is a path leading the fuel gas to the gas distribution chamber on the upstream side of the gas distribution chamber,
The gas distribution unit of a water heater, wherein the packing member has a sheet-like covering portion covering at least one of the gas supply passages.

three or more of the gas distribution chambers are arranged side by side,
Among the three or more gas distribution chambers, the central distribution chamber arranged at the center in the horizontal direction has fewer nozzles than the both end distribution chambers arranged at both ends in the horizontal direction,
In the packing member, the sheet-like covering portion covers the gas supply path including the both-end distribution chambers, and the sheet-like covering portion covers one of the both-ends distribution chambers and the sheet covers the other of the both-ends distribution chambers. and a plurality of openings communicating with the inside of the gas supply passage including the central distribution chamber,
The connecting part is installed facing the gas supply path including the central distribution chamber,
2. The gas distribution unit of a water heater according to claim 1, wherein opening regions of said opening are formed on both sides of said connecting portion.

three or more of the gas distribution chambers are arranged side by side,
Among the three or more gas distribution chambers, the central distribution chamber arranged at the center in the horizontal direction has fewer nozzles than the both end distribution chambers arranged at both ends in the horizontal direction,
The packing member has a plurality of elongated holes facing the gas supply path including the both end distribution chambers and the sheet-like covering portion covering the gas supply path including the both end distribution chambers,
3. The gas distribution unit for a water heater according to claim 1, wherein the plurality of elongated holes are arranged along the gas supply path including the central distribution chamber.

The second closing member has a groove portion forming a space into which the fuel gas enters,
the sheet-like covering portion has an overlapping portion that overlaps one of the gas supply passages and the groove portion;
The overlapping portion is provided with a plurality of holes communicating between the space in the gas supply path and the space in the groove,
The plurality of holes includes an upstream hole communicating with the space in the guide passage and the space in the groove, and a downstream hole communicating with the space in the gas distribution chamber and the space in the groove. has
The gas distribution unit for a water heater according to any one of claims 1 to 3, wherein the groove has a structure in which the fuel gas flows from the upstream side hole to the downstream side hole.

A water heater comprising a gas distribution unit according to any one of claims 1 to 4.