JP2023019517A

JP2023019517A - Water heater

Info

Publication number: JP2023019517A
Application number: JP2021124291A
Authority: JP
Inventors: 祐斗酒向; Yuto Sako; 心吾星崎; Shingo Hoshizaki
Original assignee: Paloma Co Ltd
Current assignee: Paloma Co Ltd
Priority date: 2021-07-29
Filing date: 2021-07-29
Publication date: 2023-02-09

Abstract

To provide a water heater enabling reduction in size of a casing by making piping within the casing compact.SOLUTION: An inner barrel part 10 formed by sequentially assembling a fan 3, a burner 4, a primary heat exchanger 5 and a secondary heat exchanger 6 from the lower side is provided within a casing 2 of a water heater 1. A water supply part 14 is provided in an approximately central lower part of the casing 2 on the right side of the fan 3. Water pipes disposed within the casing 2 are a water supply pipe 7, a relay pipe 8, a water delivery pipe 9 and other pipes. In a narrow space M between the inner barrel part 10 and a right side surface 24 of the casing 2, a second water supply pipe part and a third water supply pipe part 75 of the water supply pipe 7 and a first relay pipe part and a second relay pipe part of the relay pipe 8 are juxtaposed at the same position viewed from the front side.SELECTED DRAWING: Figure 1

Description

本発明は、給湯器に関する。 The present invention relates to a water heater.

従来、一次熱交換器と二次熱交換器とを備える潜熱回収型の給湯器が知られている。特許文献１は、入水管、出湯管及び入水管と出湯管との間に介在する伝熱管部を備え、入水管から伝熱管部へ流れ込む水を加熱して得られる湯を、出湯管を介して給湯器の外部に送り出す給湯器を開示する。伝熱管部は一次熱交換器及び二次熱交換器のそれぞれに設けられる。 2. Description of the Related Art Conventionally, a latent heat recovery water heater is known that includes a primary heat exchanger and a secondary heat exchanger. Patent Document 1 includes a water inlet pipe, a hot water outlet pipe, and a heat transfer pipe portion interposed between the water inlet pipe and the hot water outlet pipe, and hot water obtained by heating water flowing from the water inlet pipe to the heat transfer pipe portion is supplied through the hot water outlet pipe. Disclosed is a water heater that sends water to the outside of the water heater. A heat transfer tube portion is provided in each of the primary heat exchanger and the secondary heat exchanger.

特開２０２０－１８６８８５号公報JP 2020-186885 A

給湯器の筐体の内部には、一次熱交換器、二次熱交換器に加え、一次熱交換器及び二次熱交換器に燃焼排気を供給する燃焼装置、燃焼排気を一次熱交換器及び二次熱交換器に送り込むためのファン等、様々な部品が設けられる。また、筐体の内部には、筐体の外部から取り入れた水を一次熱交換器及び二次熱交換器に通じて加熱し、加熱された湯を筐体の外部に送り出すため、各種の水管が配管される。給湯器を小型化する要請に応えるため、筐体内部の配管の省スペース化が待望されている。 Inside the housing of the water heater, in addition to the primary heat exchanger and the secondary heat exchanger, there are a combustion device that supplies combustion exhaust to the primary heat exchanger and the secondary heat exchanger, a combustion exhaust to the primary heat exchanger and Various components are provided, such as a fan to feed the secondary heat exchanger. In addition, inside the housing, water taken in from the outside of the housing is heated through a primary heat exchanger and a secondary heat exchanger, and the heated hot water is sent out to the outside of the housing. is piped. In order to meet the demand for miniaturization of water heaters, space saving of piping inside the housing is desired.

本発明はこのような問題点を解決するためになされたものであり、筐体の内部の配管をコンパクトにし、筐体を小型化できる給湯器を提供することを目的とする。 SUMMARY OF THE INVENTION It is an object of the present invention to provide a water heater capable of reducing the size of the housing by making the piping inside the housing compact.

本発明の請求項１に係る給湯器は、ファンと、燃焼装置と、一次熱交換器と、二次熱交換器とが、下方から上方に順に組み立てられた内胴部を、第一側面、第二側面及び後面を備える筐体の内部に備える給湯器において、前記筐体の下部において、前記ファンの側方であり且つ前記燃焼装置の下方に設けられ、前記筐体の内部に給水する給水部と、前記筐体の下部に設けられ、前記筐体から外部に出水する出水部と、前記給水部と前記二次熱交換器とを接続する給水管と、前記二次熱交換器と前記一次熱交換器とを接続する中継管と、前記一次熱交換器と前記出水部とを接続する出水管とを備え、前記給水管は、前記筐体の内部において前記後面に沿って前記第一側面に向けて延びる第一給水管部と、前記第一給水管部の前記第一側面に向かう端部から前記第一側面に沿って前方に延びる第二給水管部と、前記第二給水管部の前端から前記第一側面に沿って上方に延びる第三給水管部と、前記第三給水管部と前記二次熱交換器のうち前記筐体の前記第一側面に対向する側部である第一側部の前部とを接合する第一接合部とを備え、前記中継管は、前記二次熱交換器の前記第一側部の後部から前記第一側面に沿って下方に延びる下方延管部と、前記下方延管部の下端から前方に延びた前端部が前方に開口した開口部を形成する前方延管部とを備える第一中継管部と、前記前方延管部の前記開口部に接続する接続部を備え、前記接続部から前記第一側面に沿って延びる第二中継管部と、前記第二中継管部と前記一次熱交換器のうち前記筐体の前記第一側面に対向する側部である第二側部とを接続する第二接合部とを備え、前記第二給水管部、前記第三給水管部、前記第一中継管部及び前記第二中継管部は、前記内胴部と前記第一側面との間に前記給水管及び前記中継管の外径に対応する幅で設けられる空間において、前方から見て同じ位置に並んで配置されることを特徴とする。 A water heater according to claim 1 of the present invention has an inner body portion in which a fan, a combustion device, a primary heat exchanger, and a secondary heat exchanger are assembled in this order from the bottom to the top. In a water heater provided inside a housing having a second side surface and a rear surface, a water supply for supplying water to the inside of the housing is provided on the side of the fan and below the combustion device in the lower part of the housing. a water outlet portion provided in a lower portion of the housing and discharging water from the housing to the outside; a water supply pipe connecting the water supply section and the secondary heat exchanger; and the secondary heat exchanger and the A relay pipe connecting a primary heat exchanger and a water outlet pipe connecting the primary heat exchanger and the water outlet portion are provided, and the water supply pipe extends along the rear surface inside the housing. A first water supply pipe portion extending toward the side surface, a second water supply pipe portion extending forward along the first side surface from an end portion of the first water supply pipe portion toward the first side surface, and the second water supply pipe a third water supply pipe portion extending upward along the first side surface from the front end of the portion, and a side portion of the third water supply pipe portion and the secondary heat exchanger facing the first side surface of the housing a first joint joining a front portion of a first side, wherein the relay pipe extends downward along the first side from a rear portion of the first side of the secondary heat exchanger. a first relay pipe portion including a downward extension pipe portion and a forward extension pipe portion having a front end extending forward from a lower end of the downward extension pipe portion and forming an opening opening forward; a second relay pipe portion including a connection portion connected to the opening and extending along the first side surface from the connection portion; A second joint portion that connects a second side portion that is a side portion facing one side, the second water supply pipe portion, the third water supply pipe portion, the first relay pipe portion, and the second relay The pipe portions are arranged side by side at the same position when viewed from the front in a space provided between the inner body portion and the first side surface with a width corresponding to the outer diameters of the water supply pipe and the relay pipe. characterized by

請求項２に係る給湯器は、前記開口部及び前記接続部は、前記内胴部の前方に配置されることを特徴とする。 The water heater according to claim 2 is characterized in that the opening and the connection are arranged in front of the inner body.

請求項３に係る給湯器は、前記前方延管部の前記開口部と前記第二中継管部の前記開口部とが接続した部分に装着され、前記開口部と前記開口部との接続状態を保持する保持部材を備え、前記保持部材は、前記第二側面から前記第一側面に向かう力が加えられることで前記部分に装着されることを特徴とする。 The water heater according to claim 3 is attached to a portion where the opening of the forward extension pipe portion and the opening of the second relay pipe portion are connected, and the connection state between the opening and the opening is A holding member for holding is provided, and the holding member is attached to the portion by applying a force directed from the second side surface to the first side surface.

請求項４に係る給湯器は、前記給水管は、前記ファンの側方を、前記給水部から前記後面に向けて延び、前記第一給水管部に接続する第四給水管部を備え、前記出水管は、前記一次熱交換器の前記第二側面に対向する側部から下方に延び、前記一次熱交換器及び前記二次熱交換器を介さずに前記給水部と前記出水管とを接続するバイパス管を備え、前記バイパス管は、前記ファンの側方において、前記給水部から前記後面に向けて前記第四給水管部の下方を通る第一バイパス管部と、前記第一バイパス管部の後端部から前記後面に沿って前記第二側面に向けて延び、前記出水管と接続する第二バイパス管部とを備えることを特徴とする。 The water heater according to claim 4, wherein the water supply pipe includes a fourth water supply pipe portion extending from the water supply portion toward the rear surface along the side of the fan and connected to the first water supply pipe portion, A water outlet pipe extends downward from a side portion of the primary heat exchanger facing the second side surface, and connects the water supply portion and the water outlet pipe without passing through the primary heat exchanger and the secondary heat exchanger. The bypass pipe includes a first bypass pipe portion passing below the fourth water supply pipe portion from the water supply portion toward the rear surface on the side of the fan, and the first bypass pipe portion and a second bypass pipe portion extending from a rear end portion of the second side surface along the rear surface toward the second side surface and connected to the water discharge pipe.

本発明の請求項１に係る給湯器は、内胴部と第一側面との間に設けられる給水管及び中継管の外径に対応する幅の空間に、第二給水管部、第三給水管部、第一給水管部及び第二中継管部を配管することができる。したがって、本発明に係る給湯器は、筐体の内部の配管をコンパクトにし、筐体を小型化できる。 In the water heater according to claim 1 of the present invention, a space having a width corresponding to the outer diameter of the water supply pipe and the relay pipe provided between the inner body and the first side surface has a second water supply pipe portion and a third water supply pipe. A pipe part, a first water supply pipe part and a second relay pipe part can be laid. Therefore, in the water heater according to the present invention, the piping inside the housing can be made compact, and the housing can be miniaturized.

開口部と接続部とを接続するため、開口部が給水管部の他の部分よりも拡径されることがある。また、接続部が中継管部の他の部分よりも拡径されることがある。請求項２に係る給湯器は、開口部及び接続部を内胴部の前方に配置するので、内胴部と第一側面との間の空間の幅を広げることなく、開口部と接続部とを接続することができる。したがって、給湯器は、給湯器の筐体を小型化できる。 In order to connect the opening and the connecting portion, the opening may be wider than the rest of the water supply pipe. In addition, the connecting portion may have a larger diameter than other portions of the relay pipe portion. In the water heater according to claim 2, since the opening and the connecting part are arranged in front of the inner body, the opening and the connecting part can be connected without widening the width of the space between the inner body and the first side surface. can be connected. Therefore, in the water heater, the housing of the water heater can be made smaller.

請求項３に係る給湯器は、開口部及び接続部は内胴部の前方に配置されるので、開口部と接続部とが接続した部分に対して装着される保持部材が、内胴部に干渉しない。内胴部と第一側面との間には、給水管及び中継管の外径に対応する幅の空間しか設けられないが、保持部材は、第二側面から第一側面に向かう力が加えられることで装着される。したがって、装着作業を行う作業者は、第一側面によって装着作業が阻害されることがなく、確実に保持部材を装着できる。 In the water heater according to claim 3, since the opening and the connecting portion are arranged in front of the inner barrel, the holding member attached to the portion where the opening and the connecting portion are connected is attached to the inner barrel. do not interfere. A space having a width corresponding to the outer diameter of the water supply pipe and the relay pipe is provided between the inner body and the first side, but the holding member is applied with a force directed from the second side to the first side. It is worn by Therefore, the worker who performs the mounting work can reliably mount the holding member without being hindered by the first side surface.

第一バイパス管部は、給水部から筐体の後面に向けて第四給水部の下方を通るので、ファンの側方に広いスペースを取ることなく、第一バイパス管を配置できる。第二バイパス管は、第一バイパス管の後端部から、第一給水管部とは反対方向に延びる。したがって、請求項４に係る給湯器は、小型化した筐体の内部に、バイパス管を、他の配管に干渉させることなく配置できる。 Since the first bypass pipe section passes under the fourth water supply section from the water supply section toward the rear surface of the housing, the first bypass pipe can be arranged without requiring a large space on the side of the fan. The second bypass pipe extends from the rear end of the first bypass pipe in a direction opposite to the first water supply pipe portion. Therefore, in the water heater according to claim 4, the bypass pipe can be arranged inside the downsized housing without interfering with other pipes.

フロントカバーを外した状態の給湯器１の正面図である。1 is a front view of water heater 1 with a front cover removed; FIG. 筐体２を省略した給湯器１の正面図である。2 is a front view of water heater 1 with housing 2 omitted; FIG. 筐体２を省略した給湯器１を左前方から見た斜視図である。Fig. 2 is a perspective view of the water heater 1 with the housing 2 omitted, as seen from the front left. 筐体２を省略した給湯器１を右後方から見た斜視図である。Fig. 2 is a perspective view of the water heater 1 with the housing 2 omitted, as seen from the rear right. 筐体２を省略した給湯器１を右前方から見た斜視図である。Fig. 2 is a perspective view of the water heater 1 with the housing 2 omitted, as seen from the front right. 筐体２を省略した給湯器１の右側面図である。2 is a right side view of water heater 1 with housing 2 omitted; FIG.

以下、本発明の実施形態を説明する。以下に記載される装置の構造等は、特定的な記載がない限り、それのみに限定する趣旨ではなく、単なる説明例である。図面は、本発明が採用しうる技術的特徴を説明するために用いられるものである。以下説明では、図中に矢印で示す左右、前後、上下を使用する。 Embodiments of the present invention will be described below. Unless otherwise specified, the structures and the like of the devices described below are merely illustrative examples and not intended to be limiting. The drawings are used to explain technical features that can be employed by the present invention. In the following description, left and right, front and rear, and up and down indicated by arrows in the drawings are used.

図１及び図２を参照して、給湯器１の構成について説明する。給湯器１は、潜熱回収型のガス給湯器である。図１に示すように、給湯器１は、筐体２を備える。筐体２は、上面２１、下面２２、左側面２３、右側面２４及び後面２５を備え、上下方向に長さを有し、前方が開口する箱状である。給湯器１は、筐体２の内部に、ファン３と、燃焼装置４と、一次熱交換器５と、二次熱交換器６とを下方から順に設置している。ファン３と、燃焼装置４と、一次熱交換器５と、二次熱交換器６とが下方から上方に順に組み立てられた給湯器１の内部構造を、以下、内胴部１０という。内胴部１０の左端部と筐体２の左側面２３との間、内胴部１０の右端部と筐体２の右側面２４との間の隙間は、それぞれ、筐体２の内部に配置される水管１本分程度の幅である。 The configuration of the water heater 1 will be described with reference to FIGS. 1 and 2. FIG. The water heater 1 is a latent heat recovery type gas water heater. As shown in FIG. 1 , water heater 1 includes housing 2 . The housing 2 has a top surface 21, a bottom surface 22, a left side surface 23, a right side surface 24, and a rear surface 25, has a length in the vertical direction, and has a box shape with an open front. The water heater 1 has a fan 3, a combustion device 4, a primary heat exchanger 5, and a secondary heat exchanger 6 arranged in order from below inside a housing 2. As shown in FIG. The internal structure of the water heater 1 in which the fan 3, the combustion device 4, the primary heat exchanger 5, and the secondary heat exchanger 6 are assembled in this order from bottom to top is hereinafter referred to as an inner body portion 10. As shown in FIG. The gaps between the left end of the inner body 10 and the left side 23 of the housing 2 and the gaps between the right end of the inner body 10 and the right side 24 of the housing 2 are arranged inside the housing 2. It is about the width of one water pipe.

ファン３は、前後方向に延びる略短円筒状のファンケース３１を備える。ファンケース３１は、裏面に図４に示す円形の開口部３２を備える。ファンケース３１の内部には、図示しないモータによって回転駆動する、図４に示す羽根部３３が設けられる。ファンケース３１の右上部は燃焼装置４の左下部に下側から接続し、ファンケース３１の内部と燃焼装置４の内部とが連通する。羽根部３３の回転駆動によって開口部３２から吸い込まれた空気は、ファンケース３１の内部を下方から上方に向けて流れ、一次空気として燃焼装置４の内部に供給される。 The fan 3 includes a substantially short cylindrical fan case 31 extending in the front-rear direction. The fan case 31 has a circular opening 32 shown in FIG. Inside the fan case 31, there is provided a blade portion 33 shown in FIG. 4 which is rotationally driven by a motor (not shown). The upper right portion of the fan case 31 is connected to the lower left portion of the combustion device 4 from below, and the inside of the fan case 31 and the inside of the combustion device 4 communicate with each other. The air sucked from the opening 32 by the rotational driving of the blades 33 flows upward inside the fan case 31 and is supplied to the inside of the combustion device 4 as primary air.

燃焼装置４は、上部が開口する角箱状であり、複数のガスバーナからなる図示しないバーナユニットを内部に備える。燃焼装置４の前面には、バーナユニットに燃料ガスを分配供給するためのガス分配ユニット４１が設置される。筐体２の右下方には、外部のガス管が接続されるガス入口１１が設けられる。筐体２の右下部には、主電磁弁及びガス比例弁を備えるガス管部１２が設けられる。ガス入口１１は、ガス管部１２を介してガス分配ユニット４１に接続される。バーナユニットは、ガス分配ユニット４１から供給される燃料ガスと、ファン３から供給される一次空気との混合気を噴出する。燃焼装置４の内部に設けられるイグナイタが混合気に点火することに応じて、混合気が燃焼する。 The combustion device 4 is in the shape of a rectangular box with an open top, and includes therein a burner unit (not shown) composed of a plurality of gas burners. A gas distribution unit 41 for distributing fuel gas to the burner units is installed in front of the combustion device 4 . A gas inlet 11 to which an external gas pipe is connected is provided on the lower right side of the housing 2 . A gas pipe section 12 having a main solenoid valve and a gas proportional valve is provided in the lower right portion of the housing 2 . Gas inlet 11 is connected to gas distribution unit 41 via gas pipe section 12 . The burner unit blows out a mixture of fuel gas supplied from the gas distribution unit 41 and primary air supplied from the fan 3 . The air-fuel mixture is combusted when an igniter provided inside the combustion device 4 ignites the air-fuel mixture.

一次熱交換器５は、伝熱性に優れた金属製である。一次熱交換器５は、燃焼装置４の上部の開口の上側に接続し、上下方向に延びる矩形筒状の周壁５１を備える。周壁５１は、前壁５１１、左壁５１３、右壁５１４及び図４に示す後壁５１２を備える。前壁５１１及び後壁５１２の左右方向の幅は、燃焼装置４の左右方向の幅と略同じである。左壁５１３及び右壁５１４の前後方向の幅は、燃焼装置４の前後方向の幅と略同じである。周壁５１は、燃焼装置４において混合気の燃焼によって発生する燃焼排気を下方から上方に連通させる。周壁５１の内部には、燃焼排気から顕熱を回収するための水管である、図３から図５に示す第一伝熱管５２が、左右方向に複数回往復するように配置される。周壁５１の上部は開口しており、その開口の上側に第一排気フード５８が固定される。第一排気フード５８は、上方に膨出する形状を有しており、周壁５１の上部の開口を上側から覆う。第一排気フード５８は、その後部に燃焼排気を流出させるための開口である、図示しない流出口を有している。周壁５１の上部の開口から第一排気フード５８の内部に流出した燃焼排気は、流出口から流出する。 The primary heat exchanger 5 is made of metal with excellent heat conductivity. The primary heat exchanger 5 is connected to the upper side of the upper opening of the combustion device 4 and has a rectangular cylindrical peripheral wall 51 extending in the vertical direction. The peripheral wall 51 comprises a front wall 511, a left wall 513, a right wall 514 and a rear wall 512 shown in FIG. The width of the front wall 511 and the rear wall 512 in the left-right direction is substantially the same as the width of the combustion device 4 in the left-right direction. The width of the left wall 513 and the right wall 514 in the front-rear direction is substantially the same as the width of the combustion device 4 in the front-rear direction. The peripheral wall 51 allows combustion exhaust gas generated by combustion of the air-fuel mixture in the combustion device 4 to communicate from below to above. Inside the peripheral wall 51, the first heat transfer tubes 52 shown in FIGS. 3 to 5, which are water tubes for recovering sensible heat from the combustion exhaust gas, are arranged so as to reciprocate a plurality of times in the horizontal direction. The top of the peripheral wall 51 is open, and a first exhaust hood 58 is fixed above the opening. The first exhaust hood 58 has an upwardly bulging shape and covers the upper opening of the peripheral wall 51 from above. The first exhaust hood 58 has an outlet port (not shown) at its rear portion, which is an opening for letting combustion exhaust gas flow out. The combustion exhaust that has flowed into the interior of the first exhaust hood 58 from the upper opening of the peripheral wall 51 flows out from the outlet.

二次熱交換器６は、伝熱性に優れた金属製の箱体６１を備える。箱体６１は、上壁６１１、下壁６１２、左壁６１３、右壁６１４、前壁６１５及び図４に示す後壁６１６を備える。上壁６１１は、筐体２の上面２１に対向配置される。左壁６１３は、筐体２の左側面２３に対向配置される。右壁６１４は、筐体２の右側面２４に対向配置される。後壁６１６は、筐体２の後面２５に対向配置される。上壁６１１、下壁６１２、前壁６１５及び後壁６１６の左右方向の幅は、燃焼装置４及び一次熱交換器５の左右方向の幅と略同じである。左壁６１３、右壁６１４，前壁６１５及び後壁６１６の前後方向の幅は、燃焼装置４及び一次熱交換器５の前後方向の幅よりも長い。後壁６１６は燃焼装置４の後部と略同じ位置に配置され、箱体６１の前部は燃焼装置４及び一次熱交換器５よりも前方に突出して配置される。 The secondary heat exchanger 6 has a metal box 61 with excellent heat transfer. The box 61 comprises a top wall 611, a bottom wall 612, a left wall 613, a right wall 614, a front wall 615 and a rear wall 616 shown in FIG. The upper wall 611 is arranged to face the upper surface 21 of the housing 2 . The left wall 613 is arranged to face the left side surface 23 of the housing 2 . The right wall 614 is arranged to face the right side surface 24 of the housing 2 . The rear wall 616 is arranged to face the rear surface 25 of the housing 2 . The lateral widths of the upper wall 611 , the lower wall 612 , the front wall 615 and the rear wall 616 are substantially the same as the lateral widths of the combustion device 4 and the primary heat exchanger 5 . The widths of the left wall 613 , the right wall 614 , the front wall 615 and the rear wall 616 in the front-rear direction are longer than the widths of the combustion device 4 and the primary heat exchanger 5 in the front-rear direction. The rear wall 616 is arranged at substantially the same position as the rear portion of the combustion device 4 , and the front portion of the box body 61 is arranged to protrude forward from the combustion device 4 and the primary heat exchanger 5 .

下壁６１２は、第一排気フード５８の上側に配置される。後壁６１６は、第一排気フード５８の流出口から流出した燃焼排気を流入させるための開口である、図示しない流入口を備える。第一排気フード５８及び箱体６１の後壁６１６には、第二排気フード６８が後方から固定される。第二排気フード６８は、図４に示すように後方に膨出する形状を有しており、第一排気フード５８の流出口と箱体６１の流入口とを後方から覆う。第一排気フード５８の流出口から第二排気フード６８の内部に流出した燃焼排気は、第二排気フード６８を介して箱体６１の流入口から箱体６１の内部に流入する。箱体６１の内部には、燃焼排気から潜熱を回収するための水管である図示しない第二伝熱管が、左右方向に複数回往復するように配置される。前壁６１５の中央部には、左右方向に延びる矩形状の排気口が設けられる。潜熱が回収された後の燃焼排気は、排気口から排気される。前壁６１５には、排気口に連通するように、排気筒６９が前側から固定される。排気筒６９はフロントカバーを貫通して前方に突出しており、前壁６１５の排気口から流出した燃焼排気を筐体２の外部に排出する。 A lower wall 612 is positioned above the first exhaust hood 58 . The rear wall 616 has an inlet (not shown) that is an opening for introducing the combustion exhaust that has flowed out from the outlet of the first exhaust hood 58 . A second exhaust hood 68 is fixed to the rear wall 616 of the first exhaust hood 58 and the box 61 from behind. The second exhaust hood 68 has a shape that bulges rearward as shown in FIG. 4, and covers the outlet of the first exhaust hood 58 and the inlet of the box 61 from behind. The combustion exhaust that has flowed into the second exhaust hood 68 from the outlet of the first exhaust hood 58 flows into the box 61 from the inlet of the box 61 via the second exhaust hood 68 . Inside the box 61, a second heat transfer tube (not shown), which is a water tube for recovering latent heat from combustion exhaust gas, is arranged so as to reciprocate a plurality of times in the horizontal direction. A rectangular exhaust port extending in the left-right direction is provided in the central portion of the front wall 615 . After the latent heat is recovered, the combustion exhaust is exhausted from the exhaust port. An exhaust pipe 69 is fixed to the front wall 615 from the front side so as to communicate with the exhaust port. The exhaust pipe 69 penetrates the front cover and protrudes forward, and discharges the combustion exhaust that has flowed out from the exhaust port of the front wall 615 to the outside of the housing 2 .

筐体２の略中央下方には、外部の水道管が接続される入水口１３が設けられる。筐体２の略中央下部であり、ファン３の右方には、流量調節弁、水流センサ、水ガバナ等を備える給水部１４が設けられる。給水部１４は入水口１３に接続し、筐体２の内部に給水する。筐体２の左下方には、給湯温度センサ、水流比例弁等を備え、外部の給湯栓に接続して筐体２から外部に湯を出水する出水部１５が設けられる。筐体２の右下方には、外部のガス管が接続されるガス入口１１が設けられる。筐体２の右下部には、主電磁弁及びガス比例弁を備えるガス管部１２が設けられる。ガス入口１１は、ガス管部１２を介してガス分配ユニット４１に接続される。 A water inlet 13 to which an external water pipe is connected is provided at substantially the lower center of the housing 2 . A water supply unit 14 having a flow rate control valve, a water flow sensor, a water governor, and the like is provided on the right side of the fan 3 at the substantially central lower portion of the housing 2 . The water supply unit 14 is connected to the water inlet 13 and supplies water to the inside of the housing 2 . A hot water supply temperature sensor, a water flow proportional valve, and the like are provided at the lower left of the housing 2, and a water outlet 15 is provided that is connected to an external hot water tap to discharge hot water from the housing 2 to the outside. A gas inlet 11 to which an external gas pipe is connected is provided on the lower right side of the housing 2 . A gas pipe section 12 having a main solenoid valve and a gas proportional valve is provided in the lower right portion of the housing 2 . Gas inlet 11 is connected to gas distribution unit 41 via gas pipe section 12 .

図１から図６を参照して、筐体２の内部に配置される各種の水管について説明する。以下で説明する水管において、給水部１４に近接する側を上流、出水部１５に近接する側を下流という。給湯器１は、給水管７、中継管８、出水管９、バイパス管１６を備える。 Various water tubes arranged inside the housing 2 will be described with reference to FIGS. 1 to 6 . In the water pipe described below, the side close to the water supply portion 14 is called upstream, and the side close to the water discharge portion 15 is called downstream. The water heater 1 includes a water supply pipe 7 , a relay pipe 8 , a water discharge pipe 9 and a bypass pipe 16 .

給水管７は、給水部１４と二次熱交換器６とを接続する水管である。図２から図４に示すように、給水管７は、上流から順に、接続部７１、延伸部７２、第一給水管部７３、第二給水管部７４、第三給水管部７５及び第一接合部７６を備える。図２及び図３に示すように、接続部７１は、給水管７の最も上流側の部分であり、給水部１４に接続する部分である。図２に示すように、接続部７１の上流端は、ファン３の右方において給水部１４に前側から接続する。接続部７１は、給水部１４から燃焼装置４の前部と略同じ位置まで前方に延びた後、左上方に延びる。接続部７１の下流端は、ファン３の右側の位置に配置される。図３に示すように、延伸部７２は、接続部７１の上端部から後方に向けて略９０度に曲がる継手７１Ａを介して接続部７１の下流端に後方から接続し、内胴部１０の左右方向における略中央の位置において、筐体２の後面２５に向けて略水平に延びる部分である。図３及び図４に示すように、延伸部７２は、ファン３の右方において、燃焼装置４の下面に沿うように後方に延びる。図４に示すように、延伸部７２の下流端である後端部は、燃焼装置４の後面よりもやや前方の位置まで延びる。すなわち、接続部７１と延伸部７２とによって構成される給水管７の上流部分は、給水部１４から筐体２の後面２５に向けて螺旋状に延びる。 The water supply pipe 7 is a water pipe that connects the water supply unit 14 and the secondary heat exchanger 6 . As shown in FIGS. 2 to 4, the water supply pipe 7 includes, in order from upstream, a connection portion 71, an extension portion 72, a first water supply pipe portion 73, a second water supply pipe portion 74, a third water supply pipe portion 75, and a first water supply pipe portion 75. A joint 76 is provided. As shown in FIGS. 2 and 3 , the connection portion 71 is the most upstream portion of the water supply pipe 7 and is the portion connected to the water supply portion 14 . As shown in FIG. 2, the upstream end of the connection portion 71 is connected to the water supply portion 14 on the right side of the fan 3 from the front side. The connection portion 71 extends forward from the water supply portion 14 to substantially the same position as the front portion of the combustion device 4, and then extends upward and to the left. The downstream end of the connecting portion 71 is arranged on the right side of the fan 3 . As shown in FIG. 3, the extending portion 72 is connected from the rear to the downstream end of the connecting portion 71 via a joint 71A that bends approximately 90 degrees from the upper end of the connecting portion 71 toward the rear. It is a portion that extends substantially horizontally toward the rear surface 25 of the housing 2 at a substantially central position in the left-right direction. As shown in FIGS. 3 and 4 , the extending portion 72 extends rearward along the lower surface of the combustion device 4 on the right side of the fan 3 . As shown in FIG. 4 , the rear end portion, which is the downstream end of the extended portion 72 , extends to a position slightly forward of the rear surface of the combustion device 4 . That is, the upstream portion of the water supply pipe 7 configured by the connecting portion 71 and the extending portion 72 spirally extends from the water supply portion 14 toward the rear surface 25 of the housing 2 .

図２及び図４に示すように、第一給水管部７３は、延伸部７２の後端部から右方に向けて略９０度に曲がる継手７２Ａを介して延伸部７２の下流端に右方から接続し、内胴部１０の後部の位置において、筐体２の後面２５に沿うようにして、略水平に右方に延びる部分である。第一給水管部７３の下流端である右端部は、燃焼装置４の右面のすぐ右側の位置まで延びる。図４に示すように、第二給水管部７４は、第一給水管部７３の右端部から前方に向けて略９０度に曲がる継手７３Ａを介して第一給水管部７３の下流端に前方から接続し、燃焼装置４の下部の位置において、筐体２の右面に沿って略水平に前方に延びる部分である。図３及び図４に示すように、第二給水管部７４の下流端である前端部は、二次熱交換器６の箱体６１の前壁６１５と略同じ位置まで前方に延びる。 As shown in FIGS. 2 and 4, the first water supply pipe portion 73 extends rightward from the rear end of the extension portion 72 to the downstream end of the extension portion 72 via a joint 72A that bends about 90 degrees to the right. , and extends substantially horizontally to the right along the rear surface 25 of the housing 2 at the rear portion of the inner trunk portion 10 . The right end portion, which is the downstream end of the first water supply pipe portion 73 , extends to a position immediately to the right of the right surface of the combustion device 4 . As shown in FIG. 4, the second water supply pipe portion 74 extends forward from the right end of the first water supply pipe portion 73 to the downstream end of the first water supply pipe portion 73 via a joint 73A that bends forward at approximately 90 degrees. , and extends substantially horizontally forward along the right surface of the housing 2 at a lower position of the combustion device 4 . As shown in FIGS. 3 and 4 , the front end, which is the downstream end of the second water supply pipe portion 74 , extends forward to substantially the same position as the front wall 615 of the box 61 of the secondary heat exchanger 6 .

図３及び図４に示すように、第三給水管部７５は、給水管７の最も下流側の部分である。第三給水管部７５は、第二給水管部７４の前端部から上方に向けて略９０度に曲がる継手７４Ａを介して第二給水管部７４の下流端に上方から接続し、筐体２の右側面２４に沿って上方に延び、下流端において二次熱交換器６に接続する。図４に示すように、二次熱交換器６の箱体６１の右壁６１４の前下部には、前述の第二伝熱管の上流端に連通する第三接続部６２１が設けられる。図３及び図４に示すように、第三給水管部７５は、その上下方向における中央部よりもやや上の部分から後上方に傾斜して延びる。第一接合部７６は、第三給水管部７５の下流端である上端部に上方から接合する継手である。第一接合部７６は、下方から左方に向けて略４５度に曲がり、下流端である左端部において第三接続部６２１に接合する。これにより、給水部１４から供給された水道水が、給水管７を介して二次熱交換器６の内部の第二伝熱管に導かれる。したがって、二次熱交換器６において、箱体６１の内部を通過する燃焼排気の有する潜熱の熱エネルギーが第二伝熱管を流れる水に伝達する、熱交換が行われる。第二給水管部７４と第三給水管部７５とは、左右方向において略同じ位置に配置される。 As shown in FIGS. 3 and 4 , the third water supply pipe portion 75 is the most downstream portion of the water supply pipe 7 . The third water supply pipe portion 75 is connected from above to the downstream end of the second water supply pipe portion 74 via a joint 74A that bends approximately 90 degrees upward from the front end portion of the second water supply pipe portion 74, and the housing 2 extends upward along the right side 24 of the and connects to the secondary heat exchanger 6 at its downstream end. As shown in FIG. 4 , a third connecting portion 621 communicating with the upstream end of the above-described second heat transfer tube is provided at the lower front portion of the right wall 614 of the box 61 of the secondary heat exchanger 6 . As shown in FIGS. 3 and 4, the third water supply pipe portion 75 extends obliquely rearward and upward from a portion slightly above the central portion in the vertical direction. The first joint portion 76 is a joint joined to the upper end, which is the downstream end of the third water supply pipe portion 75, from above. The first joint portion 76 bends leftward from below at approximately 45 degrees, and is joined to the third connection portion 621 at the left end, which is the downstream end. As a result, the tap water supplied from the water supply unit 14 is guided to the second heat transfer pipe inside the secondary heat exchanger 6 via the water supply pipe 7 . Therefore, in the secondary heat exchanger 6, heat exchange is performed in which the thermal energy of the latent heat of the combustion exhaust gas passing through the inside of the box 61 is transferred to the water flowing through the second heat transfer tube. The second water supply pipe portion 74 and the third water supply pipe portion 75 are arranged at substantially the same position in the left-right direction.

中継管８は、一次熱交換器５と二次熱交換器６とを接続する水管である。図４から図６に示すように、中継管８は、上流から順に、第二接合部８１０、第一中継管部８１、第二中継管部８２及び第三接合部８３を備える。二次熱交換器６の箱体６１の右壁６１４の後下部には、第二伝熱管の下流端に連通する第四接続部６２２が設けられる。第二接合部８１０は、第四接続部６２２に右方から接合する継手である。第二接合部８１０は、左方から下方に向けて略９０度に曲がり、下流端である下端部において第一中継管部８１に接合する。第一中継管部８１は、下方延管部８１１と前方延管部８１２とを備える。下方延管部８１１は、第一中継管部８１のうち上流側の部分である。下方延管部８１１は、上流端である上端部において第二接合部８１０に接続し、一次熱交換器５の右壁５１４及び燃焼装置４の右端部に沿うようにして、筐体２の右側面２４に沿って下方に延びる。下方延管部８１１の下流端である下端部は、燃焼装置４の下部に寄った位置まで下方に延びる。下方延管部８１１は、前述の給水管７の第三給水管部７５と、左右方向において略同じ位置に配置される。 The relay pipe 8 is a water pipe that connects the primary heat exchanger 5 and the secondary heat exchanger 6 . As shown in FIGS. 4 to 6, the relay pipe 8 includes a second joint portion 810, a first relay pipe portion 81, a second relay pipe portion 82 and a third joint portion 83 in order from upstream. A fourth connection portion 622 communicating with the downstream end of the second heat transfer tube is provided at the lower rear portion of the right wall 614 of the box 61 of the secondary heat exchanger 6 . The second joint portion 810 is a joint joined to the fourth connection portion 622 from the right side. The second joint portion 810 bends downward from the left at approximately 90 degrees, and joins the first relay pipe portion 81 at the lower end, which is the downstream end. The first relay pipe portion 81 includes a downward extension pipe portion 811 and a forward extension pipe portion 812 . The downward extension pipe portion 811 is a portion of the first relay pipe portion 81 on the upstream side. The downward extension pipe portion 811 is connected to the second joint portion 810 at the upper end, which is the upstream end, and extends along the right wall 514 of the primary heat exchanger 5 and the right end of the combustion device 4 to the right side of the housing 2. Extends downward along surface 24 . A lower end portion, which is a downstream end of the downward extension pipe portion 811 , extends downward to a position closer to the lower portion of the combustion device 4 . The downward extension pipe portion 811 is arranged at substantially the same position in the horizontal direction as the third water supply pipe portion 75 of the water supply pipe 7 described above.

前方延管部８１２は、下方延管部８１１の下端部から前方に向けて略９０度に曲がる継手８１Ａを介して下方延管部８１１の下流端に前方から接続し、前方に向けて略水平に延びる部分である。下方延管部８１１は、前述の給水管７の第二給水管部７４に対して上方に水管二本程度の隙間を開けて、第二給水管部７４と左右方向において略同じ位置に配置される。すなわち、前方延管部８１２は、第二給水管部７４の略真上の位置において前後方向に延びる。前方延管部８１２の下流端である前端部は、やや拡径して前方に向けて開口する。その開口の外縁にフランジ状に形成された開口部８１３が設けられている。なお、給湯器１は、前方延管部８１２を一次熱交換器５よりも下方に配置することにより、燃焼装置４が燃焼状態から非燃焼状態に移行した場合に、一次熱交換器５から二次熱交換器６に向けて湯の逆流が生ずることを低減している。 The forward extension pipe portion 812 is connected from the front to the downstream end of the downward extension pipe portion 811 via a joint 81A that bends approximately 90 degrees forward from the lower end portion of the downward extension pipe portion 811, and extends substantially horizontally toward the front. It is the part that extends to The downward extension pipe portion 811 is arranged at substantially the same position as the second water supply pipe portion 74 in the left-right direction with a gap of about two water pipes above the second water supply pipe portion 74 of the water supply pipe 7 described above. be. That is, the front extension pipe portion 812 extends in the front-rear direction at a position substantially right above the second water supply pipe portion 74 . The front end, which is the downstream end of the front extension pipe portion 812, is slightly enlarged in diameter and opens forward. A flange-shaped opening 813 is provided on the outer edge of the opening. In the water heater 1, by arranging the front extension pipe portion 812 below the primary heat exchanger 5, when the combustion device 4 shifts from the combustion state to the non-combustion state, The backflow of hot water toward the secondary heat exchanger 6 is reduced.

第二中継管部８２は、上流端に前方延管部８１２の開口部８１３に接続する接続部８２１を備え、第一中継管部８１と一次熱交換器５とを接続する水管である。接続部８２１は、後方に向けて開口する第二中継管部８２の上流端の開口外縁に、開口部８１３と略同じ大きさのフランジが形成されることで構成される。第二中継管部８２は、接続部８２１において前方延管部８１２の開口部８１３に前方から接続する。接続部８２１と開口部８１３とが接続する部分には、水管同士の接続状態を保持するための保持部材８Ａが、外側から装着される。本実施形態において、保持部材８Ａは、クイックファスナーである。 The second relay pipe portion 82 is a water pipe that has a connection portion 821 that connects to the opening 813 of the forward extension pipe portion 812 at its upstream end, and that connects the first relay pipe portion 81 and the primary heat exchanger 5 . The connecting portion 821 is configured by forming a flange having substantially the same size as the opening portion 813 on the outer edge of the opening of the upstream end of the second relay pipe portion 82 that opens toward the rear. The second relay pipe portion 82 is connected from the front to the opening portion 813 of the front extension pipe portion 812 at the connection portion 821 . A holding member 8A for holding the connected state of the water pipes is attached from the outside to the portion where the connecting portion 821 and the opening portion 813 are connected. In this embodiment, the holding member 8A is a quick fastener.

給湯器１において、前方延管部８１２の開口部８１３及び第二中継管部８２の接続部８２１は、燃焼装置４の前側に設けられるガス分配ユニット４１の前側、すなわち、内胴部１０よりも前方に配置される。これにより、燃焼装置４の右部、すなわち内胴部１０の右端部と、筐体２の右側面２４との間の空間が狭小であっても、開口部８１３及び接続部８２１のフランジ状の部分が内胴部１０の右端部及び右側面２４に干渉することなく配置される。また、開口部８１３と接続部８２１とが接続した部分に装着される保持部材８Ａが、内胴部１０の右端部及び右側面２４に干渉することが回避される。図３に示すように、保持部材８Ａは、開口部８１３と接続部８２１とが接続した部分に対して、矢印Ｙに示すように左から右に向けて装着される。このため、給湯器１の組み立て及び保守を行う作業者は、内胴部１０と右側面２４との間の空間が狭小であっても、右側面２４に阻害されることなく、開口部８１３と接続部８２１とが接続した部分に対して、保持部材８Ａを適切に装着することができる。したがって、第一中継管部８１の下流端と第二中継管部８２の上流端とが接続した状態が適切に維持される。 In the water heater 1 , the opening 813 of the forward extension pipe portion 812 and the connection portion 821 of the second relay pipe portion 82 are positioned closer to the front side of the gas distribution unit 41 provided on the front side of the combustion device 4 , that is, from the inner trunk portion 10 . placed anteriorly. As a result, even if the space between the right portion of the combustion device 4, that is, the right end portion of the inner body portion 10, and the right side surface 24 of the housing 2 is narrow, the opening 813 and the connection portion 821 are formed in a flange shape. The parts are placed without interfering with the right end and right side 24 of the inner barrel 10 . Moreover, the holding member 8A attached to the portion where the opening 813 and the connecting portion 821 are connected is prevented from interfering with the right end portion and the right side surface 24 of the inner trunk portion 10 . As shown in FIG. 3, the holding member 8A is attached from left to right as indicated by an arrow Y to the portion where the opening 813 and the connecting portion 821 are connected. Therefore, even if the space between the inner body portion 10 and the right side surface 24 is narrow, the operator who assembles and maintains the water heater 1 can easily access the opening 813 without being hindered by the right side surface 24 . The holding member 8A can be appropriately attached to the portion to which the connecting portion 821 is connected. Therefore, the state in which the downstream end of the first relay pipe portion 81 and the upstream end of the second relay pipe portion 82 are connected is appropriately maintained.

図２及び図５に示すように、一次熱交換器５の周壁５１の右壁５１４の前下部には、前述の第一伝熱管５２の上流端に連通する第一接続部５２１が設けられる。図５に示すように、第二中継管部８２は、接続部８２１から給水管７の第三給水管部７５の手前の位置まで略水平に延びた後、後方から上方に向けて略９０度に曲がる継手８２Ａによって上方に折れ曲がり、燃焼装置４の上下方向の略中央部の位置まで略垂直に上方に延びる。第二中継管部８２は、下方から後方に向けて略９０度に曲がる継手８２Ｂによって、燃焼装置４の上下方向の略中央部の位置から後方に折れ曲がり、燃焼装置４の前部の位置まで略水平に延びる。さらに、第二中継管部８２は、前方から上方に向けて略９０度に曲がる継手８２Ｃによって上方に折れ曲がって略垂直に上方に延びる。第三接合部８３は、第二中継管部８２の下流端である上端部に上方から接合する継手である。第三接合部８３は、下方から左方に向けて略９０度に曲がり、第一接続部５２１に右方から接続する。すなわち、第二中継管部８２は、一次熱交換器５の右壁５１４及び燃焼装置４の右端部に沿うようにして屈曲しながら、筐体２の右側面２４に沿って延びる。第一中継管部８１と第二中継管部８２とは、左右方向に同じ位置に配置される。二次熱交換器６で加熱されて流出した水は、中継管８を介して一次熱交換器５の内部の第一伝熱管５２に導かれる。したがって、一次熱交換器５において、周壁５１の内部を通過する燃焼排気の有する顕熱の熱エネルギーが第一伝熱管５２を流れる水に伝達する、熱交換が行われる。 As shown in FIGS. 2 and 5 , a first connecting portion 521 communicating with the upstream end of the first heat transfer pipe 52 is provided at the lower front portion of the right wall 514 of the peripheral wall 51 of the primary heat exchanger 5 . As shown in FIG. 5, the second relay pipe portion 82 extends substantially horizontally from the connection portion 821 to a position in front of the third water supply pipe portion 75 of the water supply pipe 7, and then extends upward from the rear at approximately 90 degrees. It is bent upward by the joint 82A that bends upward, and extends upward substantially vertically to a position substantially in the center of the combustion device 4 in the vertical direction. The second relay pipe portion 82 is bent rearward from a position substantially in the vertical direction of the combustion device 4 by a joint 82B that bends approximately 90 degrees from below toward the rear, and extends approximately to a position in the front portion of the combustion device 4. extend horizontally. Further, the second relay pipe portion 82 is bent upward by a joint 82C that bends approximately 90 degrees upward from the front and extends substantially vertically upward. The third joint portion 83 is a joint joined to the upper end, which is the downstream end of the second relay pipe portion 82, from above. The third joint portion 83 bends leftward from below at approximately 90 degrees and connects to the first connection portion 521 from the right side. That is, the second relay pipe portion 82 extends along the right side surface 24 of the housing 2 while bending along the right wall 514 of the primary heat exchanger 5 and the right end portion of the combustion device 4 . The first relay pipe portion 81 and the second relay pipe portion 82 are arranged at the same position in the left-right direction. The water heated by the secondary heat exchanger 6 and flowing out is guided to the first heat transfer pipe 52 inside the primary heat exchanger 5 via the relay pipe 8 . Therefore, in the primary heat exchanger 5 , heat exchange is performed in which the thermal energy of the sensible heat of the combustion exhaust gas passing through the inside of the peripheral wall 51 is transferred to the water flowing through the first heat transfer tubes 52 .

第二給水管部７４、第三給水管部７５、第一中継管部８１及び第二中継管部８２は、左右方向において略同じ位置に配置される。すなわち、図１に示すように、第二給水管部７４、第三給水管部７５、第一中継管部８１及び第二中継管部８２は、内胴部１０の右端部と筐体２の右側面２４との間に設けられる狭小空間Ｍにおいて、前方から見て同じ位置に前後に並んで配置される。前述したように、内胴部１０の右端部と筐体２の右側面２４との間の隙間の幅は、水管１本分程度である。言い換えると、給湯器１は、内胴部１０の右端部と筐体２の右側面２４との間に左右方向において給水管７及び中継管８の外径に対応する幅で設けた狭小空間Ｍに、第二給水管部７４、第三給水管部７５、第一中継管部８１及び第二中継管部８２を収容する。このようにして、給湯器１は、第二給水管部７４、第三給水管部７５、第一中継管部８１及び第二中継管部８２を、狭小空間Ｍにコンパクトに配管し、筐体２の小型化を実現している。 The second water supply pipe portion 74, the third water supply pipe portion 75, the first relay pipe portion 81, and the second relay pipe portion 82 are arranged at substantially the same position in the left-right direction. That is, as shown in FIG. 1, the second water supply pipe portion 74, the third water supply pipe portion 75, the first relay pipe portion 81, and the second relay pipe portion 82 are located between the right end portion of the inner body portion 10 and the housing 2. In the narrow space M provided between the right side surface 24, they are arranged side by side in the same position when viewed from the front. As described above, the width of the gap between the right end portion of the inner body portion 10 and the right side surface 24 of the housing 2 is about the width of one water pipe. In other words, the water heater 1 is provided with a narrow space M having a width corresponding to the outer diameters of the water supply pipe 7 and the relay pipe 8 in the left-right direction between the right end portion of the inner body portion 10 and the right side surface 24 of the housing 2. , the second water supply pipe portion 74, the third water supply pipe portion 75, the first relay pipe portion 81 and the second relay pipe portion 82 are accommodated. In this way, the water heater 1 has the second water supply pipe portion 74, the third water supply pipe portion 75, the first relay pipe portion 81, and the second relay pipe portion 82 compactly arranged in the narrow space M, 2 miniaturization has been achieved.

出水管９は、一次熱交換器５と出水部１５とを接続する水管である。図２及び図３に示すように、出水管９は、上流から順に、第一出水管部９１、第二出水管部９２及び第三出水管部９３を備える。図３に示すように、第一出水管部９１は、出水管９の最も上流側の部分である。一次熱交換器５の周壁５１の左壁５１３の前上部には、第一伝熱管５２の下流端に連通する第二接続部５２２が設けられる。第一出水管部９１は、上流端である上端部において第二接続部５２２に左方から接続し、左壁５１３において突出する第一伝熱管５２の折り返し部との干渉を避けるため、第二接続部５２２から前下方に延びた後、左壁５１３の前端部及び燃焼装置４の前端部に沿うようにして燃焼装置４の上部の位置まで下方に延びる。さらに、第一出水管部９１は、上方から後下方に向けて略４５度に曲がる継手９１Ａによって燃焼装置４の上部の位置から後下方に屈曲し、下端部を第二接続部５２２と前後方向における略同じ位置まで延ばす。 The water outlet pipe 9 is a water pipe that connects the primary heat exchanger 5 and the water outlet section 15 . As shown in FIGS. 2 and 3, the water discharge pipe 9 includes a first water discharge pipe portion 91, a second water discharge pipe portion 92 and a third water discharge pipe portion 93 in order from upstream. As shown in FIG. 3 , the first water discharge pipe portion 91 is the most upstream portion of the water discharge pipe 9 . A second connecting portion 522 that communicates with the downstream end of the first heat transfer pipe 52 is provided in the front upper portion of the left wall 513 of the peripheral wall 51 of the primary heat exchanger 5 . The first water discharge pipe portion 91 is connected to the second connection portion 522 from the left at the upper end portion, which is the upstream end, and is arranged to avoid interference with the folded portion of the first heat transfer pipe 52 projecting from the left wall 513. After extending forward and downward from the connecting portion 522 , it extends downward along the front end portion of the left wall 513 and the front end portion of the combustion device 4 to a position above the combustion device 4 . Furthermore, the first water discharge pipe portion 91 is bent rearward and downward from the upper portion of the combustion device 4 by a joint 91A that bends from the upper portion to the rearward and downward at approximately 45 degrees, and the lower end portion is connected to the second connection portion 522 in the front-rear direction. to approximately the same position in

第二出水管部９２は、出水管９の中間の部分である。図３に示すように、第二出水管部９２は、上流端である上端部において、第一出水管部９１の下端部から下方に向けて略４５度に曲がる継手９１Ｂを介して第一出水管部９１の下端部に下側から接続する。第二出水管部９２は、一次熱交換器５の左壁５１３及び燃焼装置４の左端部に沿うようにして、筐体２の左側面２３に沿ってファン３の左下部の位置まで略垂直に下方に延びる。第三出水管部９３は、出水管９の最も下流側の部分である。第三出水管部９３は、上流端である上端部において、第二出水管部９２の下端部から右下方に向けて略４５度に曲がる継手９２Ｂを介して第二出水管部９２の下端部に下側から接続し、接続した部分から右下方に延び、ファン３の下方に配置されている出水部１５に前方から接続する。これにより、一次熱交換器５で加熱されて流出した湯が、出水管９を介して出水部１５に導かれる。給湯器１は、出水管９を、内胴部１０に対して給水管７及び中継管８とは反対側の左側に配置することによって、出水管９が給水管７及び中継管８と干渉することを回避している。 The second water outlet pipe portion 92 is an intermediate portion of the water outlet pipe 9 . As shown in FIG. 3, the second water discharge pipe portion 92 has a first discharge pipe portion 92 at its upper end, which is the upstream end, through a joint 91B that bends downward from the lower end portion of the first water discharge pipe portion 91 at approximately 45 degrees. It is connected to the lower end of the water tube portion 91 from below. The second water outlet pipe portion 92 extends along the left wall 513 of the primary heat exchanger 5 and the left end portion of the combustion device 4, along the left side surface 23 of the housing 2, and extends substantially vertically to the lower left position of the fan 3. extending downwards. The third water outlet pipe portion 93 is the most downstream portion of the water outlet pipe 9 . The third water discharge pipe portion 93 has a lower end portion of the second water discharge pipe portion 92 via a joint 92B that bends approximately 45 degrees toward the lower right from the lower end portion of the second water discharge pipe portion 92 at the upper end portion that is the upstream end. is connected to the fan 3 from below, extends downward to the right from the connected portion, and is connected to the water outlet 15 arranged below the fan 3 from the front. As a result, the hot water heated by the primary heat exchanger 5 and flowing out is guided to the water outlet 15 through the water outlet pipe 9 . In the water heater 1, the water discharge pipe 9 is arranged on the left side of the inner body 10 opposite to the water supply pipe 7 and the relay pipe 8, so that the water discharge pipe 9 interferes with the water supply pipe 7 and the relay pipe 8. avoiding that.

バイパス管１６は、一次熱交換器５及び二次熱交換器６を介さずに給水部１４と出水管９とを接続する水管である。図２から図５に示すように、バイパス管１６は、上流から順に、第一バイパス管部１６１及び第二バイパス管部１６２を備える。図２、図３及び図５に示すように、第一バイパス管部１６１は、バイパス管１６の上流側の部分である。第一バイパス管部１６１は、給水管７の接続部７１の下方において給水部１４に接続する。第一バイパス管部１６１は、接続部７１の下方において、給水部１４から燃焼装置４の前部と略同じ位置まで前方に延びた後、ファン３の右側の位置まで左方に延びる。さらに、第一バイパス管部１６１は、右方から後上方に向けて略９０度に曲がる継手１６Ａによって後上方に折れ曲がり、ファン３の右側の位置から筐体２の後面２５に向けて、延伸部７２の下方において後上方に延びる。図４に示すように、第一バイパス管部１６１の下流端である後端部は、燃焼装置４の後面よりもやや前方の位置まで延び、給水管７の延伸部７２の後端部の直下の位置に配置される。このように、第一バイパス管部１６１は、給水管７の延伸部７２の下方をくぐるようにして後方に延びる。給湯器１は、ファン３の右側の位置に給水管７の延伸部７２を配置するスペースを確保することによって、そのスペースの下側の位置に第一バイパス管部１６１も配置することができる。すなわち、給湯器１は、第一バイパス管部１６１を配置するために別途のスペースをファン３の近傍に設ける必要がない。 The bypass pipe 16 is a water pipe that connects the water supply unit 14 and the water discharge pipe 9 without passing through the primary heat exchanger 5 and the secondary heat exchanger 6 . As shown in FIGS. 2 to 5, the bypass pipe 16 includes a first bypass pipe portion 161 and a second bypass pipe portion 162 in order from upstream. As shown in FIGS. 2 , 3 and 5 , the first bypass pipe portion 161 is the upstream portion of the bypass pipe 16 . The first bypass pipe portion 161 connects to the water supply portion 14 below the connection portion 71 of the water supply pipe 7 . Below the connecting portion 71 , the first bypass pipe portion 161 extends forward from the water supply portion 14 to substantially the same position as the front portion of the combustion device 4 and then extends leftward to a position on the right side of the fan 3 . Furthermore, the first bypass pipe portion 161 is bent rearward and upward by a joint 16A that bends approximately 90 degrees rearward and upward from the right side, and extends from a position on the right side of the fan 3 toward the rear surface 25 of the housing 2. It extends rearward and upward below 72 . As shown in FIG. 4 , the rear end portion, which is the downstream end of the first bypass pipe portion 161 , extends to a position slightly forward of the rear surface of the combustion device 4 and directly below the rear end portion of the extended portion 72 of the water supply pipe 7 . position. In this manner, the first bypass pipe portion 161 extends rearward so as to pass under the extended portion 72 of the water supply pipe 7 . By securing a space for arranging the extending portion 72 of the water supply pipe 7 on the right side of the fan 3, the water heater 1 can also arrange the first bypass pipe portion 161 below the space. That is, the water heater 1 does not need to provide a separate space near the fan 3 for arranging the first bypass pipe portion 161 .

図４に示すように、第二バイパス管部１６２は、第一バイパス管部１６１の後端部から左方に向けて略９０度曲がる継手１６Ｂを介して第一バイパス管部１６１の下流端に左方から接続する。第二バイパス管部１６２は、燃焼装置４の下側において筐体２の後面２５に沿うように、継手１６Ｂから燃焼装置４の左側の位置まで略水平に左方に延びる。第二バイパス管部１６２は、給水管７の延伸部７２の後端部の直下の位置から、給水管７の第一給水管部７３が延びる右方向とは反対の左方向に延びるので、筐体２の後面２５に近接する位置において、バイパス管１６と給水管７とが干渉することがない。 As shown in FIG. 4, the second bypass pipe portion 162 extends from the rear end of the first bypass pipe portion 161 to the downstream end of the first bypass pipe portion 161 via a joint 16B that bends approximately 90 degrees to the left. Connect from the left. The second bypass pipe portion 162 extends substantially horizontally leftward from the joint 16B to a position on the left side of the combustion device 4 along the rear surface 25 of the housing 2 on the lower side of the combustion device 4 . Since the second bypass pipe portion 162 extends in the left direction opposite to the right direction in which the first water supply pipe portion 73 of the water supply pipe 7 extends from a position directly below the rear end portion of the extending portion 72 of the water supply pipe 7, At a position close to the rear surface 25 of the body 2, the bypass pipe 16 and the water supply pipe 7 do not interfere.

図３に示すように、燃焼装置４の左側の位置まで左方に延びた第二バイパス管部１６２は、右方から上前方に向けて略９０度に曲がる継手１６Ｃによって上前方に折れ曲がって延び、出水管９の第二出水管部９２に後方から接続する。第二バイパス管部１６２の上前方に延びる部分は、左右方向において第二出水管部９２と同じ位置に配置される。つまり、前方から見て、第二バイパス管部１６２の上前方に延びる部分は、第二出水管部９２と同じ位置に配置される。前述したように、内胴部１０の左端部と筐体２の左側面２３との間の隙間の幅は、水管１本分程度である。すなわち、給湯器１は、第二バイパス管部１６２のうち内胴部１０の左側に配置される部分と、出水管９の第一出水管部９１及び第二出水管部９２とを、内胴部１０の左端部と筐体２の左側面２３との間に設けられる狭小空間Ｎに収容する。このようにして、給湯器１は、筐体２の小型化を実現している。出水部１５は、バイパス管１６から出水管９に供給される水量を調節し、適温の湯を筐体２の外部に出水する。 As shown in FIG. 3, the second bypass pipe portion 162 extending leftward to the left side of the combustion device 4 is bent upward and forward by a joint 16C that bends approximately 90 degrees upward and forward from the right. , is connected to the second outlet pipe portion 92 of the outlet pipe 9 from the rear. A portion of the second bypass pipe portion 162 extending forward and upward is arranged at the same position as the second water discharge pipe portion 92 in the left-right direction. That is, when viewed from the front, the portion of the second bypass pipe portion 162 extending forward and upward is arranged at the same position as the second water discharge pipe portion 92 . As described above, the width of the gap between the left end portion of the inner body portion 10 and the left side surface 23 of the housing 2 is about the width of one water pipe. That is, the water heater 1 is configured such that the portion of the second bypass pipe portion 162 that is arranged on the left side of the inner body portion 10 and the first water discharge pipe portion 91 and the second water discharge pipe portion 92 of the water discharge pipe 9 are separated from each other by the inner body. It is housed in a narrow space N provided between the left end portion of the portion 10 and the left side surface 23 of the housing 2 . In this manner, the water heater 1 achieves the miniaturization of the housing 2 . The water discharge unit 15 adjusts the amount of water supplied from the bypass pipe 16 to the water discharge pipe 9 and discharges hot water at an appropriate temperature to the outside of the housing 2 .

以上説明したように、給湯器１は、内胴部１０と筐体２の右側面２４との間に設けられる、給水管７及び中継管８の外径に対応する幅の狭小空間Ｍに、第二給水管部７４、第三給水管部７５、第一給水管部７３及び第二給水管部７４を配管する。すなわち、第二給水管部７４、第三給水管部７５、第一中継管部８１及び第二中継管部８２は、狭小空間Ｍにおいて、前方から見て同じ位置に前後に並んで配置される。したがって、給湯器１は、筐体２の内部の配管をコンパクトにし、筐体２を小型化できる。 As described above, the water heater 1 is provided between the inner body portion 10 and the right side surface 24 of the housing 2, and in the narrow space M having a width corresponding to the outer diameter of the water supply pipe 7 and the relay pipe 8, The second water supply pipe portion 74, the third water supply pipe portion 75, the first water supply pipe portion 73, and the second water supply pipe portion 74 are laid. That is, the second water supply pipe portion 74, the third water supply pipe portion 75, the first relay pipe portion 81, and the second relay pipe portion 82 are arranged side by side at the same position when viewed from the front in the narrow space M. . Therefore, in the water heater 1, the piping inside the housing 2 can be made compact, and the housing 2 can be miniaturized.

第一中継管部８１を構成する前方延管部８１２の下流端は、前方延管部８１２の他の部分に対して拡径している。前方延管部８１２の下流端に設けられる開口部８１３は、フランジ状に形成されている。第二中継管部８２の上流端に設けられ、開口部８１３に接続する接続部８２１も、フランジ状に形成されている。給湯器１は、開口部８１３及び接続部８２１を燃焼装置４の前側に設けられるガス分配ユニット４１の前方、すなわち、内胴部１０よりも前方に配置する。これにより、給湯器１は、開口部８１３及び接続部８２１のフランジ状の部分が内胴部１０の右端部及び右側面２４に干渉しない位置に開口部８１３と接続部８２１とが接続する部分を配置する領域を確保し、狭小空間Ｍの左右方向の幅を広げることを回避できる。したがって、給湯器１は、筐体２をさらに小型化できる。 The downstream end of the forward extension pipe portion 812 that constitutes the first relay pipe portion 81 has a larger diameter than the other portion of the forward extension pipe portion 812 . An opening 813 provided at the downstream end of the front extending pipe portion 812 is formed in a flange shape. A connection portion 821 provided at the upstream end of the second relay pipe portion 82 and connected to the opening portion 813 is also formed in a flange shape. The water heater 1 arranges the opening 813 and the connecting part 821 in front of the gas distribution unit 41 provided on the front side of the combustion device 4 , that is, in front of the inner body 10 . As a result, the water heater 1 has a portion where the opening 813 and the connecting portion 821 are connected to a position where the flange-like portion of the opening 813 and the connecting portion 821 does not interfere with the right end portion and the right side surface 24 of the inner body portion 10 . It is possible to secure an area for arrangement and avoid widening the width of the narrow space M in the left-right direction. Therefore, the water heater 1 can further reduce the size of the housing 2 .

開口部８１３と接続部８２１とが接続した部分に装着される保持部材８Ａが装着される。開口部８１３及び接続部８２１は、内胴部１０よりも前方に配置される。よって、保持部材８Ａが内胴部１０及び筐体２の右側面２４に干渉しない。保持部材８Ａに対して左から右に向かう力が加えられることによって、保持部材８Ａが開口部８１３と接続部８２１とが接続した部分に装着される。このため、作業者は、内胴部１０と右側面２４との間の空間が狭小であっても、右側面２４に阻害されることなく、開口部８１３及び接続部８２１に対して、保持部材８Ａを適切に装着することができる。したがって、第一中継管部８１の下流端と第二中継管部８２の上流端とが接続した状態が適切に維持される。 A holding member 8A is attached to a portion where the opening 813 and the connecting portion 821 are connected. The opening 813 and the connecting portion 821 are arranged forward of the inner trunk portion 10 . Therefore, the holding member 8A does not interfere with the inner body portion 10 and the right side surface 24 of the housing 2 . By applying a left-to-right force to the holding member 8A, the holding member 8A is attached to the portion where the opening 813 and the connecting portion 821 are connected. Therefore, even if the space between the inner trunk portion 10 and the right side surface 24 is narrow, the operator can easily attach the holding member to the opening 813 and the connecting portion 821 without being obstructed by the right side surface 24 . 8A can be properly attached. Therefore, the state in which the downstream end of the first relay pipe portion 81 and the upstream end of the second relay pipe portion 82 are connected is appropriately maintained.

バイパス管１６の第一バイパス管部１６１は、給水管７の接続部７１の下方において給水部１４に接続し、接続部７１の下方の位置において、給水部１４から燃焼装置４の前部と略同じ位置まで前方に延びた後、ファン３の右側の位置まで左方に延びる。さらに、第一バイパス管部１６１は、ファン３の右側の位置から筐体２の後面２５に向けて、給水管７の延伸部７２の下方において後上方に延びる。第二バイパス管部１６２は、第一バイパス管部１６１の下流端に左方から接続し、燃焼装置４の下側において筐体２の後面２５に沿うように、燃焼装置４の左側の位置まで略水平に左方に延びる。すなわち、第二バイパス管部１６２は、給水管７の延伸部７２の後端部の直下の位置から、給水管７の第一給水管部７３が延びる右方向とは反対の左方向に延びる。したがって、給湯器１は、小型化した筐体２の内部において、バイパス管１６と給水管７とを干渉させることなく配置できる。 The first bypass pipe portion 161 of the bypass pipe 16 is connected to the water supply portion 14 below the connection portion 71 of the water supply pipe 7, and at a position below the connection portion 71, from the water supply portion 14 to the front portion of the combustion device 4 and substantially. After extending forward to the same position, it extends leftward to a position on the right side of the fan 3 . Further, the first bypass pipe portion 161 extends rearward and upward from the position on the right side of the fan 3 toward the rear surface 25 of the housing 2 below the extending portion 72 of the water supply pipe 7 . The second bypass pipe portion 162 is connected to the downstream end of the first bypass pipe portion 161 from the left, and extends along the rear surface 25 of the housing 2 on the lower side of the combustion device 4 to the left side of the combustion device 4. It extends almost horizontally to the left. That is, the second bypass pipe portion 162 extends in the left direction opposite to the right direction in which the first water supply pipe portion 73 of the water supply pipe 7 extends from a position immediately below the rear end portion of the extending portion 72 of the water supply pipe 7 . Therefore, the water heater 1 can be arranged inside the downsized housing 2 without causing the bypass pipe 16 and the water supply pipe 7 to interfere with each other.

本実施形態において、給湯器１が、本発明の「給湯器」に相当する。ファン３が、本発明の「ファン」に相当する。燃焼装置４が、本発明の「燃焼装置」に相当する。一次熱交換器５が、本発明の「一次熱交換器」に相当する。二次熱交換器６が、本発明の「二次熱交換器」に相当する。内胴部１０が、本発明の「内胴部」に相当する。筐体２が、本発明の「筐体」に相当する。右側面２４が、本発明の「第一側面」に相当する。左側面２３が、本発明の「第二側面」に相当する。後面２５が、本発明の「後面」に相当する。給水部１４が、本発明の「給水部」に相当する。出水部１５が、本発明の「出水部」に相当する。給水管７が、本発明の「給水管」に相当する。第一給水管部７３が、本発明の「第一給水管部」に相当する。第二給水管部７４が、本発明の「第二給水管部」に相当する。第三給水管部７５が、本発明の「第三給水管部」に相当する。接続部７１及び延伸部７２が、本発明の「第四給水管部」に相当する。右壁６１４が、本発明の「第一側部」に相当する。第一接合部７６が、本発明の「第一接合部」に相当する。中継管８が、本発明の「中継管」に相当する。第二接合部８１０が、本発明の「第二接合部」に相当する。第一中継管部８１が、本発明の「第一中継管部」に相当する。下方延管部８１１が、本発明の「下方延管部」に相当する。前方延管部８１２が、本発明の「前方延管部」に相当する。開口部８１３が、本発明の「開口部」に相当する。第二中継管部８２が、本発明の「第二中継管部」に相当する。右壁５１４が、本発明の「第二側部」に相当する。第三接合部８３が、本発明の「第三接合部」に相当する。接続部８２１が、本発明の「接続部」に相当する。狭小空間Ｍが、本発明の「空間」に相当する。出水管９が、本発明の「出水管」に相当する。バイパス管１６が、本発明の「バイパス管」に相当する。第一バイパス管部１６１が、本発明の「第一バイパス管部」に相当する。第二バイパス管部１６２が、本発明の「第二バイパス管部」に相当する。 In this embodiment, the water heater 1 corresponds to the "water heater" of the present invention. The fan 3 corresponds to the "fan" of the present invention. The combustion device 4 corresponds to the "combustion device" of the present invention. The primary heat exchanger 5 corresponds to the "primary heat exchanger" of the present invention. The secondary heat exchanger 6 corresponds to the "secondary heat exchanger" of the present invention. The inner trunk portion 10 corresponds to the "inner trunk portion" of the present invention. The housing 2 corresponds to the "housing" of the present invention. The right side 24 corresponds to the "first side" of the present invention. The left side surface 23 corresponds to the "second side surface" of the present invention. The rear surface 25 corresponds to the "rear surface" of the present invention. The water supply unit 14 corresponds to the "water supply unit" of the present invention. The water outlet 15 corresponds to the "water outlet" of the present invention. The water supply pipe 7 corresponds to the "water supply pipe" of the present invention. The first water supply pipe portion 73 corresponds to the "first water supply pipe portion" of the present invention. The second water supply pipe part 74 corresponds to the "second water supply pipe part" of the present invention. The third water supply pipe portion 75 corresponds to the "third water supply pipe portion" of the present invention. The connecting portion 71 and the extending portion 72 correspond to the "fourth water supply pipe portion" of the present invention. Right wall 614 corresponds to the "first side" of the present invention. The first joint portion 76 corresponds to the "first joint portion" of the present invention. The relay pipe 8 corresponds to the "relay pipe" of the present invention. The second joint portion 810 corresponds to the "second joint portion" of the present invention. The first relay pipe portion 81 corresponds to the "first relay pipe portion" of the present invention. The downward extension tube portion 811 corresponds to the "downward extension tube portion" of the present invention. The front extension tube portion 812 corresponds to the "front extension tube portion" of the present invention. The opening 813 corresponds to the "opening" of the present invention. The second relay pipe portion 82 corresponds to the "second relay pipe portion" of the present invention. The right wall 514 corresponds to the "second side" of the present invention. The third joint portion 83 corresponds to the "third joint portion" of the present invention. The connecting portion 821 corresponds to the "connecting portion" of the present invention. The narrow space M corresponds to the "space" of the present invention. The outflow pipe 9 corresponds to the "outflow pipe" of the present invention. The bypass pipe 16 corresponds to the "bypass pipe" of the present invention. The first bypass pipe portion 161 corresponds to the "first bypass pipe portion" of the present invention. The second bypass pipe portion 162 corresponds to the "second bypass pipe portion" of the present invention.

なお、本発明は上記実施形態に限定されるものではなく、種々の変更が可能である。例えば、給湯器１は、ガス給湯器に限られず、石油給湯器等であってもよい。 The present invention is not limited to the above embodiments, and various modifications are possible. For example, the water heater 1 is not limited to a gas water heater, and may be an oil water heater or the like.

保持部材８Ａは、クイックファスナーの他、配管固定用のバンド、ローレットナット、ローレットボルト等、他の配管保持手段であってもよい。 The holding member 8A may be other pipe holding means such as a pipe fixing band, a knurled nut, a knurled bolt, etc., in addition to the quick fastener.

給湯器１は、内胴部１０と筐体２の左側面２３との間に設けられる空間に、第二給水管部７４、第三給水管部７５、第一給水管部７３及び第二給水管部７４を配管してもよい。給湯器１は、内胴部１０と筐体２の右側面２４との間に設けられる空間に、第二バイパス管部１６２のうち内胴部１０の左側に配置される部分と、出水管９の第一出水管部９１及び第二出水管部９２とを配管してもよい。すなわち、筐体２の内部における各種水管の配置が、上記実施形態と左右反転していてもよい。 The water heater 1 includes a second water supply pipe portion 74, a third water supply pipe portion 75, a first water supply pipe portion 73, and a second water supply pipe portion 74 in a space provided between the inner body portion 10 and the left side surface 23 of the housing 2. The pipe portion 74 may be piped. In the water heater 1, in the space provided between the inner trunk portion 10 and the right side surface 24 of the housing 2, the portion of the second bypass pipe portion 162 disposed on the left side of the inner trunk portion 10 and the water discharge pipe 9 The first water discharge pipe portion 91 and the second water discharge pipe portion 92 may be laid. That is, the arrangement of various water tubes inside the housing 2 may be left-right reversed from that of the above-described embodiment.

ファン３が燃焼装置４の左下部に対して下から接続する構成であってもよい。この場合、給水部１４が、ファン３の左方に配置されてもよい。給水管７の接続部７１及び延伸部７２が、ファン３の左方において延びるように配置されてもよい。また、バイパス管１６の第一バイパス管部１６１も、ファン３の左方において給水管７の接続部７１及び延伸部７２の下方をくぐるように配置されてもよい。 The fan 3 may be connected to the lower left portion of the combustion device 4 from below. In this case, the water supply section 14 may be arranged on the left side of the fan 3 . The connecting portion 71 and the extending portion 72 of the water supply pipe 7 may be arranged to extend to the left of the fan 3 . Further, the first bypass pipe portion 161 of the bypass pipe 16 may also be arranged to pass under the connection portion 71 and extension portion 72 of the water supply pipe 7 on the left side of the fan 3 .

前方延管部８１２の開口部８１３及び第二中継管部８２の接続部８２１は、燃焼装置４の前方の他、内胴部１０を構成するファン３又は一次熱交換器５の前方に配置されてもよい。 The opening 813 of the forward extension pipe portion 812 and the connection portion 821 of the second relay pipe portion 82 are arranged in front of the combustion device 4 and also in front of the fan 3 or the primary heat exchanger 5 that constitute the inner body portion 10 . may

１給湯器
２筐体
３ファン
４燃焼装置
５一次熱交換器
６二次熱交換器
７給水管
８中継管
９出水管
１０内胴部
１４給水部
１５出水部
１６パイパス管
２３左側面
２４右側面
２５後面
７１接続部
７２延伸部
７３第一給水管部
７４第二給水管部
７５第三給水管部
８１第一中継管部
８２第二中継管部
１６１第一バイパス管部
１６２第二バイパス管部
８１１下方延管部
８１２前方延管部
８１３開口部
８２１接続部
Ｍ狭小空間 1 Water heater 2 Housing 3 Fan 4 Combustion device 5 Primary heat exchanger 6 Secondary heat exchanger 7 Water supply pipe 8 Relay pipe 9 Water discharge pipe 10 Inner body 14 Water supply 15 Water discharge 16 Bypass pipe 23 Left side 24 Right side 25 Rear surface 71 Connection part 72 Extension part 73 First water supply pipe part 74 Second water supply pipe part 75 Third water supply pipe part 81 First relay pipe part 82 Second relay pipe part 161 First bypass pipe part 162 Second bypass pipe part 811 Downward extending pipe portion 812 Forward extending pipe portion 813 Opening 821 Connecting portion M Narrow space

Claims

A fan, a combustion device, a primary heat exchanger, and a secondary heat exchanger are assembled in this order from bottom to top to form an inner body inside a housing having a first side surface, a second side surface and a rear surface. In the water heater provided,
a water supply unit provided in a lower part of the housing on the side of the fan and below the combustion device for supplying water to the inside of the housing;
a water outlet provided at a lower portion of the housing for discharging water from the housing to the outside;
a water supply pipe connecting the water supply unit and the secondary heat exchanger;
a relay pipe connecting the secondary heat exchanger and the primary heat exchanger;
a water outlet pipe connecting the primary heat exchanger and the water outlet,
The water supply pipe
a first water supply pipe portion extending along the rear surface toward the first side surface inside the housing;
a second water supply pipe portion extending forward along the first side surface from an end portion of the first water supply pipe portion toward the first side surface;
a third water supply pipe portion extending upward along the first side surface from the front end of the second water supply pipe portion;
A first joint portion that joins the third water supply pipe portion and a front portion of a first side portion of the secondary heat exchanger that is a side portion facing the first side surface of the housing,
The relay pipe is
a downward extension pipe portion extending downward along the first side surface from a second joint portion joined to a rear portion of the first side portion of the secondary heat exchanger; and a downward extension pipe portion extending forward from a lower end of the downward extension pipe portion a first relay pipe portion including a front extension pipe portion forming an opening with a front end opening forward;
a second relay pipe portion including a connection portion connected to the opening portion of the forward extension pipe portion and extending along the first side surface from the connection portion;
A third joint portion that connects the second relay pipe portion and a second side portion of the primary heat exchanger that is a side portion facing the first side surface of the housing,
The second water supply pipe portion, the third water supply pipe portion, the first relay pipe portion and the second relay pipe portion are arranged between the inner body portion and the first side surface of the water supply pipe and the relay pipe. A water heater characterized by being arranged side by side at the same position when viewed from the front in a space provided with a width corresponding to an outer diameter.

2. The water heater according to claim 1, wherein the opening and the connecting portion are arranged in front of the inner body.

a holding member attached to a portion where the opening of the forward extension pipe portion and the opening of the second relay pipe portion are connected, and holding a connection state between the opening and the opening;
The water heater according to claim 2, wherein the holding member is attached to the portion by applying a force from the second side surface toward the first side surface.

The water supply pipe includes a fourth water supply pipe portion extending from the water supply portion toward the rear surface on the side of the fan and connected to the first water supply pipe portion,
The water outlet pipe extends downward from the side facing the second side of the primary heat exchanger,
A bypass pipe that connects the water supply unit and the water discharge pipe without passing through the primary heat exchanger and the secondary heat exchanger,
The bypass pipe includes a first bypass pipe portion passing below the fourth water supply pipe portion from the water supply portion toward the rear surface on the side of the fan, and a rear end portion of the first bypass pipe portion to the The water heater according to any one of claims 1 to 3, further comprising a second bypass pipe portion extending along the rear surface toward the second side surface and connected to the water outlet pipe.