JP2023062321A

JP2023062321A - Water heater

Info

Publication number: JP2023062321A
Application number: JP2021172219A
Authority: JP
Inventors: 貴博松下; Takahiro Matsushita
Original assignee: Paloma Co Ltd
Current assignee: Paloma Co Ltd
Priority date: 2021-10-21
Filing date: 2021-10-21
Publication date: 2023-05-08

Abstract

To provide a water heater capable of configuring a path member with a simple structure.SOLUTION: A path unit 7 is equipped with a covering portion 20 and a connection plate 80. The covering portion 20 is equipped with a bulging portion 21 and a flange portion 22. The connection plate 80 is laid between both right and left portions of the flange portion 22. The connection plate 80 and the flange portion 22 abut on the respective peripheral portions of an outflow port 531 and an inflow port 617 through a packing 90. In a part surrounded by the connection plate 80 and a lower half portion of the flange portion 22, an introduction port is formed. The introduction port overlaps the outflow port 531 from a rear side, and introduces combustion exhaust in an exhaust hood 53 into the covering portion 20. In a part surrounded by the connection plate 80 and an upper half portion of the flange portion 22, a lead-out port is formed. The lead-out port overlaps the inflow port 617 from a rear side, and combustion exhaust in the covering portion 20 is led out into a housing 61 of a secondary heat exchanger 6.SELECTED DRAWING: Figure 8

Description

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

特許文献１に記載の給湯器は潜熱回収型であり、一次熱交換器と二次熱交換器を備える。一次熱交換器はバーナの排気経路の上流側に設けられ、燃焼排気の顕熱と伝熱管の通水との熱交換を行う。二次熱交換器は、排気経路の下流側で且つ一次熱交換器の上方に設けられ、燃焼排気中の潜熱と伝熱管の通水との熱交換を行う。 The water heater described in Patent Document 1 is of a latent heat recovery type, and includes a primary heat exchanger and a secondary heat exchanger. The primary heat exchanger is provided on the upstream side of the exhaust path of the burner, and performs heat exchange between the sensible heat of the combustion exhaust gas and the water passing through the heat transfer tubes. The secondary heat exchanger is provided downstream of the exhaust path and above the primary heat exchanger, and performs heat exchange between latent heat in the combustion exhaust gas and water passing through the heat transfer tubes.

特開２０２０－１８６８８５号公報JP 2020-186885 A

上記の給湯器は、低コスト化の観点から後部に導入口を設けた二次熱交換器のケーシングを絞り加工品としているが、より低コスト化を進める為に、一次熱交換器の出口部品についても絞り加工品とするのが好ましい。そうすると、出口部品と、二次熱交換器のケーシングとを連通する為の経路部材が必要となる。生産性とコスト面の観点から、そのような経路部材についても簡素な構成が望ましい。 In the above-mentioned water heater, the casing of the secondary heat exchanger with the introduction port at the rear is a drawn product from the viewpoint of cost reduction. It is also preferable to use a drawn product. In that case, a path member is required for communicating the outlet component and the casing of the secondary heat exchanger. From the standpoint of productivity and cost, a simple configuration is desirable for such path members as well.

本発明の目的は、簡素な構成で経路部材を構成できる給湯器を提供することである。 SUMMARY OF THE INVENTION An object of the present invention is to provide a water heater in which a path member can be configured with a simple configuration.

請求項１の給湯器は、バーナの燃焼排気が流れる排気経路の上流側に設けられ、前記燃焼排気の顕熱と通水とを熱交換する為の顕熱回収部と、前記排気経路の下流側で且つ前記顕熱回収部の上方に設けられ、前記顕熱回収部を通過した前記燃焼排気の潜熱と通水とを熱交換する為の潜熱回収部と、前記顕熱回収部の後部に設けられ、後方に向けて開口する出口部と、前記潜熱回収部の後部に設けられ、後方に向けて開口する入口部とを接続し、前記出口部から排出される前記燃焼排気を、前記入口部を介して前記潜熱回収部内に導出する経路部材とを備え、前記経路部材は、後方に膨出する膨出部と、前記膨出部の前端部から前後左右方向に拡がるフランジ部とを備える本体部と、前記膨出部の後壁との間に前後方向に所定の隙間を隔てるように前記フランジ部の左右の両側部間に架設される架設部とを備え、前記架設部と前記フランジ部が、前記出口部及び前記入口部の夫々の周辺部と当接し、前記架設部と、前記フランジ部の前記架設部よりも下側部分である下半部とに囲まれた部分に、前記出口部に後方から重なって、前記顕熱回収部内の前記燃焼排気を前記経路部材内に導入する導入口が形成され、前記架設部と、前記フランジ部の前記架設部よりも上側部分である上半部とに囲まれた部分に、前記入口部に後方から重なって、前記経路部材内の前記燃焼排気を前記潜熱回収部内に導出する導出口が形成されたことを特徴とする。 The water heater of claim 1 is provided on the upstream side of an exhaust path through which combustion exhaust gas from a burner flows, and has a sensible heat recovery section for heat exchange between sensible heat of the combustion exhaust gas and flowing water, and a downstream side of the exhaust path. a latent heat recovery unit provided on the side and above the sensible heat recovery unit for heat exchange between the latent heat of the combustion exhaust that has passed through the sensible heat recovery unit and water flow; An outlet portion provided and opening rearward is connected to an inlet portion provided at the rear portion of the latent heat recovery section and opening rearward, and the combustion exhaust discharged from the outlet portion is connected to the inlet portion. a passage member leading into the latent heat recovery portion through a portion, wherein the passage member includes a bulging portion that bulges rearward, and a flange portion that extends in the front, rear, left, and right directions from a front end portion of the bulging portion. a body portion; and a bridging portion bridging between both left and right sides of the flange portion so as to separate a predetermined gap in the front-rear direction from the rear wall of the bulging portion, wherein the bridging portion and the flange contacting peripheral portions of the outlet portion and the inlet portion, and surrounded by the bridging portion and a lower half portion of the flange portion that is lower than the bridging portion, the An introduction port for introducing the combustion exhaust gas in the sensible heat recovery unit into the path member is formed so as to overlap the outlet portion from the rear, and the bridge portion and the upper portion of the flange portion above the bridge portion are formed. An outlet port is formed in a portion surrounded by the two halves, overlapping the inlet portion from behind, for leading the combustion exhaust gas in the path member into the latent heat recovery portion.

請求項２の給湯器は、バーナの燃焼排気が流れる排気経路の上流側に設けられ、前記燃焼排気の顕熱と通水とを熱交換する為の顕熱回収部と、前記排気経路の下流側で且つ前記顕熱回収部の上方に設けられ、前記顕熱回収部を通過した前記燃焼排気を受け入れて外部に排出する為の排出部と、前記顕熱回収部の後部に設けられ、後方に向けて開口する出口部と、前記排出部の後部に設けられ、後方に向けて開口する入口部とを接続し、前記出口部から排出される前記燃焼排気を、前記入口部を介して前記排出部内に導出する経路部材とを備え、前記経路部材は、後方に膨出する膨出部と、前記膨出部の前端部から前後左右方向に拡がるフランジ部とを備える本体部と、前記膨出部の後壁との間に前後方向に所定の隙間を隔てるように前記フランジ部の左右の両側部間に架設される架設部とを備え、前記架設部と前記フランジ部が、前記出口部及び前記入口部の夫々の周辺部と当接し、前記架設部と、前記フランジ部の前記架設部よりも下側部分である下半部とに囲まれた部分に、前記出口部に後方から重なって、前記顕熱回収部内の前記燃焼排気を前記経路部材内に導入する導入口が形成され、前記架設部と、前記フランジ部の前記架設部よりも上側部分である上半部とに囲まれた部分に、前記入口部に後方から重なって、前記経路部材内の前記燃焼排気を前記排出部内に導出する導出口が形成されたことを特徴とする。 The water heater of claim 2 is provided on the upstream side of an exhaust path through which combustion exhaust gas from a burner flows, a sensible heat recovery part for heat exchange between sensible heat of the combustion exhaust gas and flowing water, and a downstream side of the exhaust path. a discharge part provided on the side and above the sensible heat recovery part for receiving the combustion exhaust that has passed through the sensible heat recovery part and discharging it to the outside; and an inlet portion provided at the rear portion of the discharge portion and opening toward the rear is connected, and the combustion exhaust discharged from the outlet portion is passed through the inlet portion to the a path member extending into the discharge section, the path member including a main body portion including a bulging portion that bulges rearward; a bridging portion bridging between both left and right sides of the flange portion so as to separate a predetermined gap from the rear wall of the protruding portion in the front-rear direction, wherein the bridging portion and the flange portion are connected to the outlet portion; and a portion surrounded by the bridging portion and a lower half portion of the flange portion which is lower than the bridging portion, and overlaps the outlet portion from behind. An introduction port for introducing the combustion exhaust gas in the sensible heat recovery section into the path member is formed, and is surrounded by the bridging section and an upper half of the flange section that is above the bridging section. A discharge port is formed in the rear portion of the combustion chamber so as to overlap the inlet portion from behind and guide the combustion exhaust gas in the path member into the discharge portion.

請求項１の給湯器によれば、膨出部を備えた本体部と架設部という極めてシンプル且つ少数の部品で経路部材を構成できる。これにより、本態様は、給湯器の生産性を向上でき且つコストも節約できる。なお、潜熱回収部は、燃焼排気中の潜熱を回収するものであるが、仮に顕熱回収部において回収しきれなかった顕熱がある場合は、潜熱回収部において回収される。 According to the water heater of claim 1, the path member can be configured with an extremely simple and small number of parts, namely, the main body portion having the bulging portion and the bridging portion. Thereby, this aspect can improve the productivity of the water heater and save the cost. The latent heat recovery unit recovers the latent heat in the combustion exhaust gas. If there is sensible heat that cannot be recovered in the sensible heat recovery unit, it is recovered in the latent heat recovery unit.

請求項２の給湯器によれば、膨出部を備えた本体部と架設部という極めてシンプル且つ少数の部品で経路部材を構成できる。これにより、本態様は、給湯器の生産性を向上でき且つコストも節約できる。 According to the water heater of claim 2, the path member can be configured with a very simple and small number of parts, ie, the main body portion provided with the bulging portion and the bridge portion. Thereby, this aspect can improve the productivity of the water heater and save the cost.

給湯器１の正面図である。1 is a front view of water heater 1. FIG. 給湯器１の内部構造（筐体を省略）の斜視図である。1 is a perspective view of an internal structure (a housing is omitted) of water heater 1. FIG. 一次熱交換器５と二次熱交換器６の右後方から見た斜視図である。4 is a perspective view of the primary heat exchanger 5 and the secondary heat exchanger 6 as seen from the rear right. FIG. 一次熱交換器５と二次熱交換器６の断面斜視図である。4 is a cross-sectional perspective view of a primary heat exchanger 5 and a secondary heat exchanger 6. FIG. 一次熱交換器５と二次熱交換器６の断面図である。4 is a cross-sectional view of a primary heat exchanger 5 and a secondary heat exchanger 6; FIG. 一次熱交換器５と二次熱交換器６の後方に経路ユニット７を配置した状態の斜視図である。4 is a perspective view of a state in which a path unit 7 is arranged behind the primary heat exchanger 5 and the secondary heat exchanger 6. FIG. 経路ユニット７の分解斜視図である。4 is an exploded perspective view of the path unit 7; FIG. 図７とは別角度から見た経路ユニット７の分解斜視図である。FIG. 8 is an exploded perspective view of the route unit 7 viewed from a different angle from that of FIG. 7; 固定板３１が背面に固定された整流板７０の斜視図である。FIG. 3 is a perspective view of a rectifying plate 70 with a fixed plate 31 fixed to the rear surface thereof; 整流板７０の前側に接続板８０を配置した状態の斜視図である。3 is a perspective view of a state in which a connection plate 80 is arranged on the front side of a straightening plate 70; FIG. 覆い部２０の前側に整流板７０を配置した状態の斜視図である。3 is a perspective view of a state in which a rectifying plate 70 is arranged on the front side of the cover portion 20; FIG. 接続板８０が固定された覆い部２０の前側に、パッキン９０が配置された状態の斜視図である。4 is a perspective view of a state in which a packing 90 is arranged on the front side of the cover portion 20 to which the connection plate 80 is fixed; FIG. 接続板８０が固定された覆い部２０の右側面図である。4 is a right side view of the cover portion 20 to which the connection plate 80 is fixed; FIG. 経路ユニット７の右斜め前方から見た斜視図である。FIG. 3 is a perspective view of the path unit 7 as seen obliquely from the front right. 熱交換器５００と排気ボックス６００の断面図である。5 is a cross-sectional view of heat exchanger 500 and exhaust box 600. 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構成などは、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為に用いられるものである。以下説明は、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 there is a specific description, the device configurations and the like described below are merely illustrative examples and not intended to limit the scope of the present invention. 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 top and bottom indicated by arrows in the drawings are used.

図１～図６を参照し、給湯器１の構成を説明する。図１，図２に示すように、給湯器１は、潜熱回収型のガス給湯器である。給湯器１は筐体２（図１参照）内に下から順に、ファン３、燃焼装置４、一次熱交換器５、二次熱交換器６、経路ユニット７（図３参照）を備える。 The configuration of the water heater 1 will be described with reference to FIGS. 1 to 6. FIG. As shown in FIGS. 1 and 2, the water heater 1 is a latent heat recovery type gas water heater. The water heater 1 includes a fan 3, a combustion device 4, a primary heat exchanger 5, a secondary heat exchanger 6, and a path unit 7 (see FIG. 3) in order from the bottom in a housing 2 (see FIG. 1).

燃焼装置４は角箱状のインナーケース４Ａを備える。インナーケース４Ａ内には、複数の扁平状の濃淡バーナ（図示略）が左右方向に重ねた状態で配設される。ファン３はインナーケース４Ａの下部に固定され、インナーケース４Ａ内に燃焼用空気を供給する。インナーケース４Ａの前面には、ガス供給ユニット８が固定される。ガス供給ユニット８はインナーケース４Ａ内の複数の濃淡バーナにガスを分配供給する。インナーケース４Ａ内では、複数の濃淡バーナがガスと空気の混合気を燃焼することにより燃焼排気が発生する。 The combustion device 4 has a square box-shaped inner case 4A. In the inner case 4A, a plurality of flattened light and dark burners (not shown) are arranged in a laterally stacked state. The fan 3 is fixed to the lower portion of the inner case 4A and supplies combustion air into the inner case 4A. A gas supply unit 8 is fixed to the front surface of the inner case 4A. A gas supply unit 8 distributes and supplies gas to a plurality of rich and thin burners in the inner case 4A. In the inner case 4A, a plurality of rich-lean burners burn a mixture of gas and air to generate combustion exhaust.

図２，図３に示すように、一次熱交換器５は、周壁５１、伝熱管５２（図２参照）、排気フード５３を備える。周壁５１は上下方向に延びる略矩形筒状であり、インナーケース４Ａの上部の開口に接続する。周壁５１は、右壁５１１、左壁５１２、前壁５１３、後壁５１４を備える。周壁５１は、燃焼装置４で発生した燃焼排気を下方から上方に通過させる。右壁５１１には入口５５が設けられる。左壁５１２には出口５６が設けられる。伝熱管５２は、周壁５１内に左右方向に複数回往復するように屈曲して配置される（図４，図５参照）。伝熱管５２は通水管であり、周壁５１内を下方から上方に通過する燃焼排気から顕熱を回収する。伝熱管５２の上流側一端部は入口５５と接続し、下流側一端部は出口５６と接続する。 As shown in FIGS. 2 and 3 , the primary heat exchanger 5 includes a peripheral wall 51 , heat transfer tubes 52 (see FIG. 2), and an exhaust hood 53 . The peripheral wall 51 has a substantially rectangular tubular shape extending in the vertical direction and is connected to the upper opening of the inner case 4A. The peripheral wall 51 has a right wall 511 , a left wall 512 , a front wall 513 and a rear wall 514 . The peripheral wall 51 allows combustion exhaust gas generated in the combustion device 4 to pass from below to above. An inlet 55 is provided in the right wall 511 . An outlet 56 is provided in the left wall 512 . The heat transfer tube 52 is bent and disposed in the peripheral wall 51 so as to reciprocate a plurality of times in the horizontal direction (see FIGS. 4 and 5). The heat transfer pipe 52 is a water pipe and recovers sensible heat from combustion exhaust gas passing through the peripheral wall 51 from below to above. One upstream end of the heat transfer tube 52 is connected to the inlet 55 , and one downstream end is connected to the outlet 56 .

排気フード５３は、周壁５１の上部の開口を覆うように設けられ、上方に膨出する。排気フード５３の後壁５３０（図６参照）は、背面視左右方向に長い矩形状である。後壁５３０には、流出口５３１が設けられる。流出口５３１は背面視左右方向に長い略矩形状であり、後方に向けて開口する。流出口５３１は、排気フード５３内の燃焼排気を後述の覆い部２０内に流出させる。後壁５３０において、流出口５３１の右側、左側、及び下側には、５つの固定穴５８が設けられる。 The exhaust hood 53 is provided so as to cover the upper opening of the peripheral wall 51 and bulges upward. A rear wall 530 (see FIG. 6) of the exhaust hood 53 has a rectangular shape elongated in the left-right direction in rear view. An outflow port 531 is provided in the rear wall 530 . The outflow port 531 has a substantially rectangular shape elongated in the left and right direction in a rear view, and opens toward the rear. The outflow port 531 allows combustion exhaust gas in the exhaust hood 53 to flow out into the cover portion 20 which will be described later. Five fixing holes 58 are provided on the right side, the left side, and the bottom side of the outlet 531 in the rear wall 530 .

図２，図３に示すように、二次熱交換器６は、筐体６１、伝熱管６２、排気部６３を備える。筐体６１は、右壁６１１、左壁６１２、前壁６１３、後壁６１４（図３，図６参照）、上壁６１５（図２，図４，図５参照）、底壁６１６（図４，図５参照）を備える。右壁６１１には、入口６５と出口６６が設けられる。前壁６１３には、開口部６１８（図４参照）が設けられる。筐体６１の左右方向の幅は、一次熱交換器５の周壁５１の左右方向の幅と略同一である。筐体６１の前後方向の長さは、一次熱交換器５の周壁５１の前後方向の長さよりも長い。平面視において、後壁６１４の位置は、一次熱交換器５の周壁５１の後壁５１４の位置と略同一である。それ故、前壁６１３の位置は、一次熱交換器５の周壁５１の前壁５１３の位置よりも前方に突出した位置となる。底壁６１６は、一次熱交換器５の排気フード５３の上側に配置される。 As shown in FIGS. 2 and 3 , the secondary heat exchanger 6 includes a housing 61 , heat transfer tubes 62 and an exhaust section 63 . The housing 61 includes a right wall 611, a left wall 612, a front wall 613, a rear wall 614 (see FIGS. 3 and 6), a top wall 615 (see FIGS. 2, 4 and 5), and a bottom wall 616 (see FIG. 4). , see FIG. 5). The right wall 611 is provided with an inlet 65 and an outlet 66 . The front wall 613 is provided with an opening 618 (see FIG. 4). The lateral width of the housing 61 is substantially the same as the lateral width of the peripheral wall 51 of the primary heat exchanger 5 . The length of the housing 61 in the front-rear direction is longer than the length of the peripheral wall 51 of the primary heat exchanger 5 in the front-rear direction. In plan view, the position of the rear wall 614 is substantially the same as the position of the rear wall 514 of the peripheral wall 51 of the primary heat exchanger 5 . Therefore, the position of the front wall 613 is a position that protrudes forward from the position of the front wall 513 of the peripheral wall 51 of the primary heat exchanger 5 . The bottom wall 616 is arranged above the exhaust hood 53 of the primary heat exchanger 5 .

図６に示すように、後壁６１４には、流入口６１７が設けられる。流入口６１７は背面視左右方向に長い略矩形状であり、後方に向けて開口する。流入口６１７の左右方向の幅は、流出口５３１の左右方向の幅と略同一である。流入口６１７は、後述の覆い部２０内を流れる燃焼排気を筐体６１内に流入させる。後壁６１４において、流入口６１７の右側、左側、及び上側には、５つの固定穴６８が設けられる。 As shown in FIG. 6, the rear wall 614 is provided with an inlet 617 . The inflow port 617 has a substantially rectangular shape elongated in the left and right direction when viewed from the back, and opens toward the rear. The lateral width of the inlet 617 is substantially the same as the lateral width of the outlet 531 . The inflow port 617 allows combustion exhaust gas, which flows through the inside of the cover portion 20 to be described later, to flow into the housing 61 . Five fixing holes 68 are provided on the right side, the left side, and the upper side of the inlet 617 in the rear wall 614 .

伝熱管６２は、筐体６１内に左右方向に複数回往復するように屈曲して配置される（図４，図５参照）。伝熱管６２は通水管であり、一次熱交換器５で顕熱が回収された燃焼排気から潜熱を回収する。なお、二次熱交換器６は、燃焼排気中の潜熱を回収するものであるが、仮に一次熱交換器５で回収しきれなかった顕熱がある場合は、二次熱交換器６の伝熱管６２において回収される。伝熱管６２の上流側一端部は入口６５と接続し、下流側一端部は出口６６と接続する。 The heat transfer tube 62 is bent and disposed in the housing 61 so as to reciprocate a plurality of times in the horizontal direction (see FIGS. 4 and 5). The heat transfer pipe 62 is a water pipe, and recovers latent heat from the combustion exhaust gas whose sensible heat has been recovered by the primary heat exchanger 5 . In addition, the secondary heat exchanger 6 recovers the latent heat in the combustion exhaust gas. It is recovered in hot tube 62 . One upstream end of the heat transfer tube 62 is connected to the inlet 65 , and one downstream end is connected to the outlet 66 .

排気部６３は、前壁６１３に設けられる(図１，図２参照)。排気部６３はフランジ部６３１と排気筒６３２を備える。フランジ部６３１は正面視左右方向に長い略矩形枠状に形成され、前壁６１３の前面に固定される。排気筒６３２は、フランジ部６３１の開口部の内縁部から前方に突出して設けられ、正面視左右方向に長い略長円状である。排気筒６３２は、前壁６１３に設けられた開口部６１８の前側に配置される（図４参照）。排気筒６３２は、筐体２のフロントカバー（図示略）を貫通して前方へ突出し、筐体６１内を通過した燃焼排気を筐体２の外部へ排出する。 The exhaust part 63 is provided on the front wall 613 (see FIGS. 1 and 2). The exhaust portion 63 includes a flange portion 631 and an exhaust tube 632 . The flange portion 631 is formed in a substantially rectangular frame shape elongated in the left and right direction when viewed from the front, and is fixed to the front surface of the front wall 613 . The exhaust pipe 632 protrudes forward from the inner edge of the opening of the flange portion 631, and has a substantially oval shape elongated in the left-right direction when viewed from the front. The exhaust pipe 632 is arranged in front of an opening 618 provided in the front wall 613 (see FIG. 4). The exhaust pipe 632 protrudes forward through a front cover (not shown) of the housing 2 and discharges combustion exhaust that has passed through the housing 61 to the outside of the housing 2 .

図４～図６に示すように、経路ユニット７は、一次熱交換器５の排気フード５３の後壁５３０と二次熱交換器６の後壁６１４とを後方から覆うように設けられる。経路ユニット７は、覆い部２０を備える。覆い部２０は背面視略横長の略矩形状に形成され、その外縁部を除く略矩形状の中央部（後述の後壁２１１）が後方に膨出する。覆い部２０は内側に、流出口５３１から流入口６１７に向けて燃焼排気を通過させる空間を形成する。図４，図５に示すように、覆い部２０内には、整流板７０が支持される。整流板７０は、覆い部２０内の空間を２つに分断し、覆い部２０内を流れる燃焼排気を２つの流れに整流する。なお、経路ユニット７の具体的構成は後述する。 As shown in FIGS. 4 to 6, the path unit 7 is provided so as to cover the rear wall 530 of the exhaust hood 53 of the primary heat exchanger 5 and the rear wall 614 of the secondary heat exchanger 6 from behind. The path unit 7 has a cover portion 20 . The cover portion 20 is formed in a substantially rectangular shape that is substantially horizontally long when viewed from the rear, and a substantially rectangular center portion (a rear wall 211 to be described later) bulges rearward except for the outer edge portion. The cover portion 20 forms a space inside to allow the combustion exhaust to pass from the outflow port 531 toward the inflow port 617 . As shown in FIGS. 4 and 5 , a current plate 70 is supported inside the cover portion 20 . The straightening plate 70 divides the space inside the cover portion 20 into two and straightens the combustion exhaust flowing inside the cover portion 20 into two flows. A specific configuration of the route unit 7 will be described later.

筐体２の下面には、ガス入口１１、水入口１２、湯出口１３が設けられる。ガス入口１１には外部のガス管（図示略）が接続される。水入口１２には水道管（図示略）が接続される。湯出口１３には給湯栓への配管（図示略）が接続される。ガス入口１１は、筐体２内で、元弁や比例弁等を備えたガス管１４を介してガス供給ユニット８に接続される。水入口１２は給水部１５に接続される。給水部１５は給水管１６Ａ，１６Ｂを介して、二次熱交換器６の入口６５に接続される。二次熱交換器６の出口６６は中継管１７を介して、一次熱交換器５の入口５５と接続する。一次熱交換器５の出口５６は、出湯管１８を介して湯出口１３と接続する。給水部１５と出湯管１８との間には、バイパス管１９が接続される。バイパス管１９は一次熱交換器５と二次熱交換器６を介さずに、給水部１５から供給される水の一部を、出湯管１８を流れる湯水に合流させる。 A gas inlet 11 , a water inlet 12 , and a hot water outlet 13 are provided on the bottom surface of the housing 2 . An external gas pipe (not shown) is connected to the gas inlet 11 . A water pipe (not shown) is connected to the water inlet 12 . A pipe (not shown) to a hot water tap is connected to the hot water outlet 13 . The gas inlet 11 is connected within the housing 2 to the gas supply unit 8 via a gas pipe 14 having a main valve, a proportional valve, or the like. Water inlet 12 is connected to water supply 15 . The water supply unit 15 is connected to an inlet 65 of the secondary heat exchanger 6 via water supply pipes 16A and 16B. Outlet 66 of secondary heat exchanger 6 is connected to inlet 55 of primary heat exchanger 5 via relay pipe 17 . The outlet 56 of the primary heat exchanger 5 is connected to the hot water outlet 13 via the hot water outlet pipe 18 . A bypass pipe 19 is connected between the water supply portion 15 and the hot water outlet pipe 18 . The bypass pipe 19 allows part of the water supplied from the water supply unit 15 to join the hot water flowing through the hot water discharge pipe 18 without passing through the primary heat exchanger 5 and the secondary heat exchanger 6 .

図７，図８を参照し、経路ユニット７の具体的構成を説明する。経路ユニット７は、後方から順に、覆い部２０、固定板３１、整流板７０、固定板３２、接続板８０、パッキン９０を備える。 A specific configuration of the route unit 7 will be described with reference to FIGS. 7 and 8. FIG. The path unit 7 includes a cover portion 20, a fixing plate 31, a straightening plate 70, a fixing plate 32, a connection plate 80, and a packing 90 in order from the rear.

覆い部２０の形状を説明する。覆い部２０は内側に燃焼排気が流れる空間を形成する。覆い部２０は、背面視略矩形状の金属板で形成され、膨出部２１とフランジ部２２を備える。膨出部２１は、外周縁部を除く正面視略矩形状の後壁２１１が後方に膨出することにより、前面が開口する略箱状に形成される。フランジ部２２は膨出部２１の前側の開口端から外側に向けてフランジ状に突出し、正面視横長の略矩形枠状に形成される。後壁２１１の前面の中央には、左右に間隔を空けて並ぶ左右一対の突起２３が設けられる。突起２３は前方に突出する。 The shape of the cover part 20 is demonstrated. The cover portion 20 forms a space in which the combustion exhaust flows. The cover portion 20 is formed of a metal plate having a substantially rectangular shape when viewed from the rear, and includes a bulging portion 21 and a flange portion 22 . The bulging portion 21 is formed in a substantially box shape with an open front surface by bulging rear wall 211, which is substantially rectangular in front view except for the outer peripheral edge, rearward. The flange portion 22 protrudes outward from the opening end on the front side of the bulging portion 21 in a flange shape, and is formed in a substantially rectangular frame shape that is horizontally long when viewed from the front. A pair of left and right protrusions 23 are provided in the center of the front surface of the rear wall 211 and are spaced apart from each other. The protrusion 23 protrudes forward.

フランジ部２２の右側部と左側部の夫々の上下方向中央部には、凹部２６が設けられる。凹部２６は、右側部と左側部の夫々の長さ方向に直交するように左右方向に延設され、後方に向けて凹んで形成される。凹部２６の深さは、後述の接続板８０の板厚と略同一である。凹部２６には、突起２７が設けられる。突起２７は前方に突出する。フランジ部２２の上側部と下側部の夫々には、３つの固定穴２４が左右方向に等間隔で設けられる。フランジ部２２の右側部と左側部の夫々には、２つの固定穴２４が凹部２６を上下方向の中央に挟む位置に設けられる。覆い部２０の背面視の大きさは、一次熱交換器５の排気フード５３の後壁５３０と、二次熱交換器６の後壁６１４とを上下に連接した大きさと略同一である。 A concave portion 26 is provided in each of the right and left sides of the flange portion 22 in the vertical direction central portion. The recessed portion 26 extends in the left-right direction so as to be orthogonal to the length directions of the right side portion and the left side portion, and is recessed toward the rear. The depth of the concave portion 26 is substantially the same as the plate thickness of the connection plate 80 which will be described later. A protrusion 27 is provided in the recess 26 . The projection 27 protrudes forward. Three fixing holes 24 are provided at equal intervals in the left-right direction in each of the upper and lower portions of the flange portion 22 . Two fixing holes 24 are provided in each of the right side and the left side of the flange portion 22 at positions sandwiching the concave portion 26 in the center in the vertical direction. The size of the cover portion 20 when viewed from the rear is substantially the same as the size of the vertical connection of the rear wall 530 of the exhaust hood 53 of the primary heat exchanger 5 and the rear wall 614 of the secondary heat exchanger 6 .

整流板７０の形状を説明する。整流板７０は金属板であって、本体部７１、下側屈曲部７２、上側屈曲部７３を備える。本体部７１は正面視左右方向に長い略矩形状に形成される。本体部７１の背面の右端部における下部には、突起７１１（図８参照）が設けられる。突起７１１は後方に突出する。本体部７１の前面の右端部における上部には、突起７１２（図７参照）が設けられる。突起７１２は前方に突出する。本体部７１の背面の左端部における上部には、突起７１３（図８参照）が設けられる。突起７１３は後方に突出する。本体部７１の前面の左端部における下部には、突起７１４（図７参照）が設けられる。 The shape of the current plate 70 will be described. The straightening plate 70 is a metal plate and includes a body portion 71 , a lower bent portion 72 and an upper bent portion 73 . The main body portion 71 is formed in a substantially rectangular shape that is long in the left-right direction when viewed from the front. A protrusion 711 (see FIG. 8) is provided at the lower right end portion of the back surface of the main body portion 71 . The protrusion 711 protrudes rearward. A projection 712 (see FIG. 7) is provided on the upper portion of the right end portion of the front surface of the main body portion 71 . The projection 712 protrudes forward. A protrusion 713 (see FIG. 8) is provided on the upper left end portion of the back surface of the body portion 71 . The protrusion 713 protrudes rearward. A protrusion 714 (see FIG. 7) is provided at the lower left end portion of the front surface of the main body portion 71 .

本体部７１の右端部には固定片７４が設けられ、左端部には固定片７５が設けられる。固定片７４は平面視略Ｌ字状に形成され、本体部７１の右端部の中央から前方に延び且つ先端側が右方に屈曲して延びる。固定片７４のうち右方に延びる先端部７４１の前面の上部には、前方に突出する突起７８が設けられる。固定片７５は、固定片７４とは左右対称形状であって、平面視略逆Ｌ字状に形成される。固定片７５は、本体部７１の左端部の中央から前方に延び且つ先端側が左方に屈曲して延びる。固定片７５のうち左方に延びる先端部７５１の前面の下部には、前方に突出する突起７９が設けられる。下側屈曲部７２は、本体部７１の下端部から前方に向けて側面視略円弧状に屈曲する。上側屈曲部７３は本体部７１の上端部から前方に向けて側面視略円弧状に屈曲する。 A fixing piece 74 is provided at the right end of the body portion 71, and a fixing piece 75 is provided at the left end. The fixing piece 74 is formed in a substantially L shape in a plan view, extends forward from the center of the right end portion of the main body portion 71, and extends while being bent rightward at the tip side. A front end portion 741 of the fixed piece 74 extending to the right is provided with a projection 78 projecting forward from the upper portion of the front surface thereof. The fixed piece 75 is bilaterally symmetrical with the fixed piece 74 and is formed in a generally inverted L shape in a plan view. The fixing piece 75 extends forward from the center of the left end portion of the main body portion 71 and extends with its distal end bent leftward. A projection 79 protruding forward is provided on the lower front surface of the tip portion 751 of the fixed piece 75 extending leftward. The lower bent portion 72 bends forward from the lower end portion of the main body portion 71 in a generally arcuate shape in a side view. The upper bent portion 73 bends forward from the upper end portion of the main body portion 71 in a generally arcuate shape in a side view.

固定板３１，３２の形状を説明する。なお、固定板３１，３２は互いに共通部品なので、固定板３１の形状を説明する。固定板３１は、中央部３５、第１固定部３６、第２固定部３７を備える。固定板３１の左右方向の長さは、整流板７０の本体部７１の左右方向の長さと略同一である。中央部３５は、平面視前方に向けて開口する略コの字状で且つ正面視左右方向に長い略矩形状に形成される。中央部３５には、左右一対の穴部３５１が設けられる。一対の穴部３５１は、覆い部２０の後壁２１１の前面に設けられた一対の突起２３に対応する。 The shape of the fixing plates 31 and 32 will be explained. Since the fixing plates 31 and 32 are common parts, the shape of the fixing plate 31 will be explained. The fixed plate 31 has a central portion 35 , a first fixed portion 36 and a second fixed portion 37 . The length of the fixing plate 31 in the left-right direction is substantially the same as the length of the main body portion 71 of the straightening plate 70 in the left-right direction. The center portion 35 is formed in a substantially U-shape that opens forward in plan view and in a substantially rectangular shape elongated in the left-right direction in front view. A pair of left and right holes 351 are provided in the central portion 35 . The pair of holes 351 correspond to the pair of protrusions 23 provided on the front surface of the rear wall 211 of the cover section 20 .

第１固定部３６は中央部３５の右側の前端部から右方に延設され、背面視下側に向けて開口する略逆Ｕ字状に形成される。第１固定部３６の右端側には、上下一対の固定穴３６１が設けられる。第２固定部３７は中央部３５の左側の前端部から左方に延設され、背面視上側に向けて開口する略Ｕ字状に形成される。第２固定部３７の左端側には、上下一対の固定穴３７１が設けられる。固定穴３６１，３７１は前後方向に貫通する。 The first fixing portion 36 extends rightward from the front end portion on the right side of the central portion 35 and is formed in a substantially inverted U shape that opens downward in rear view. A pair of upper and lower fixing holes 361 are provided on the right end side of the first fixing portion 36 . The second fixing portion 37 extends leftward from the left front end portion of the central portion 35 and is formed in a substantially U shape that opens upward in a rear view. A pair of upper and lower fixing holes 371 are provided on the left end side of the second fixing portion 37 . The fixing holes 361 and 371 penetrate in the front-rear direction.

後述するが、固定板３１は整流板７０の背面側に固定され、固定板３２は整流板７０の前面側に固定される。固定板３２は、固定板３１の前後の向きと反対であり、中央部３５の開口する内側を後方に向けて配置される。右側に位置する第１固定部３６は正面視上側に向けて開口する略Ｕ字状である。左側に位置する第２固定部３７は正面視下側に向けて開口する略逆Ｕ字状である。上記の通り、固定板３１，３２は互いに共通部品なので、保管管理が容易である。 As will be described later, the fixed plate 31 is fixed to the back side of the straightening plate 70 , and the fixed plate 32 is fixed to the front side of the straightening plate 70 . The fixed plate 32 is arranged in the opposite direction to the front-rear direction of the fixed plate 31, with the inner side of the opening of the central portion 35 facing rearward. The first fixing portion 36 located on the right side has a substantially U shape opening upward in a front view. The second fixing portion 37 located on the left side has a substantially inverted U shape that opens downward when viewed from the front. As described above, since the fixing plates 31 and 32 are common parts, storage management is easy.

接続板８０の形状を説明する。接続板８０は金属板であって、正面視左右方向に細長い略矩形状に形成される。接続板８０は、本体部８１、右固定部８２、左固定部８３を備える。本体部８１は接続板８０の左右方向の中央部であって、正面視左右方向に細長い略矩形状に形成される。本体部８１の前面には、上下一対の突状部８４が左右方向に且つ互いに平行に延設される。突状部８４は、本体部８１の前面から前方にリブ状に突出する。突状部８４は、本体部８１の剛性を向上する。本体部８１の右端部の上部には、前後方向に貫通する固定穴８７が設けられる。本体部８１の左端部の下部には、前後方向に貫通する固定穴８８が設けられる。 The shape of the connection plate 80 will be described. The connection plate 80 is a metal plate, and is formed in a substantially rectangular shape elongated in the horizontal direction when viewed from the front. The connection plate 80 includes a body portion 81 , a right fixing portion 82 and a left fixing portion 83 . The body portion 81 is the central portion in the left-right direction of the connection plate 80 and is formed in a substantially rectangular shape elongated in the left-right direction when viewed from the front. A pair of upper and lower projecting portions 84 are provided on the front surface of the main body portion 81 so as to extend in the left-right direction and parallel to each other. The projecting portion 84 protrudes forward from the front surface of the main body portion 81 in a rib shape. The projecting portion 84 improves the rigidity of the body portion 81 . A fixing hole 87 penetrating in the front-rear direction is provided in the upper portion of the right end portion of the main body portion 81 . A fixing hole 88 penetrating in the front-rear direction is provided in the lower portion of the left end portion of the main body portion 81 .

右固定部８２は本体部８１の右端部に設けられる。右固定部８２は正面視上下方向に長い略矩形状に形成される。右固定部８２は、覆い部２０のフランジ部２２の右側部に設けられた凹部２６と略同一の大きさである。右固定部８２の中央には固定穴８５が設けられる。右固定部８２の右端部には、前方に突出するリブ８２１が設けられる。左固定部８３は本体部８１の左端部に設けられる。左固定部８３は正面視上下方向に長い略矩形状に形成される。左固定部８３も、覆い部２０のフランジ部２２の左端部に設けられた凹部２６と略同一の大きさである。左固定部８３の中央には固定穴８６が設けられる。左固定部８３の左端部には、前方に突出するリブ８３１が設けられる。 The right fixing portion 82 is provided at the right end portion of the main body portion 81 . The right fixing portion 82 is formed in a substantially rectangular shape elongated in the vertical direction when viewed from the front. The right fixing portion 82 has substantially the same size as the recess 26 provided on the right side of the flange portion 22 of the cover portion 20 . A fixing hole 85 is provided in the center of the right fixing portion 82 . A rib 821 projecting forward is provided at the right end of the right fixing portion 82 . The left fixing portion 83 is provided at the left end portion of the main body portion 81 . The left fixing portion 83 is formed in a substantially rectangular shape elongated in the vertical direction when viewed from the front. The left fixing portion 83 also has substantially the same size as the concave portion 26 provided at the left end portion of the flange portion 22 of the cover portion 20 . A fixing hole 86 is provided in the center of the left fixing portion 83 . A rib 831 projecting forward is provided at the left end of the left fixing portion 83 .

パッキン９０の形状を説明する。パッキン９０は例えば合成樹脂で形成され、その厚さは約３ｍｍである。パッキン９０は、枠状部９１と板状部９２を備える。枠状部９１は正面視左右方向に長い略矩形枠状に形成され、覆い部２０の大きさと略同一である。枠状部９１の上側部、下側部、右側部、左側部の夫々の幅は、フランジ部２２の幅と略同一である。 The shape of the packing 90 will be explained. The packing 90 is made of synthetic resin, for example, and has a thickness of about 3 mm. The packing 90 has a frame-shaped portion 91 and a plate-shaped portion 92 . The frame-shaped portion 91 is formed in a substantially rectangular frame shape that is long in the left-right direction when viewed from the front, and has substantially the same size as the cover portion 20 . The widths of the upper portion, the lower portion, the right portion, and the left portion of the frame portion 91 are substantially the same as the width of the flange portion 22 .

板状部９２は、枠状部９１の内側の開口部の内周縁のうち右内縁部と左内縁部の夫々の中央部の間に架設され、正面視左右方向に長い略矩形状に形成される。板状部９２の上側には上側開口部９３が形成され、板状部９２の下側には下側開口部９４が形成される。上側開口部９３と下側開口部９４は、正面視左右方向に長い略矩形状に形成される。枠状部９１の上側部と下側部の夫々には、３つの固定穴９５が設けられる。３つの固定穴９５は、上側部と下側部の夫々の右側、中央、左側に配置される。枠状部９１の右側部と左側部の夫々には、２つの固定穴９５が設けられる。２つの固定穴９５は、上側部と下側部の夫々において、上側開口部９３と下側開口部９４の夫々に対応する位置に配置される。 The plate-shaped portion 92 extends between the central portions of the right inner edge portion and the left inner edge portion of the inner peripheral edge of the inner opening portion of the frame-shaped portion 91, and is formed in a substantially rectangular shape elongated in the left-right direction when viewed from the front. be. An upper opening 93 is formed on the upper side of the plate-like portion 92 , and a lower opening 94 is formed on the lower side of the plate-like portion 92 . The upper opening 93 and the lower opening 94 are formed in a substantially rectangular shape elongated in the left-right direction when viewed from the front. Three fixing holes 95 are provided in each of the upper and lower portions of the frame-shaped portion 91 . Three fixing holes 95 are located on the right, middle and left sides of the upper and lower parts, respectively. Two fixing holes 95 are provided in each of the right side and the left side of the frame-shaped portion 91 . The two fixing holes 95 are arranged at positions corresponding to the upper opening 93 and the lower opening 94 respectively in the upper part and the lower part, respectively.

経路ユニット７の組立方法の一例を説明する。なお、説明の便宜上、経路ユニット７を組み立てる際の各部品の向きについては、給湯器１に収容された状態の向きに倣って説明する。先ず、図７，図８に示すように、組み立て作業者は、整流板７０の本体部７１の背面側に固定板３１を配置する。第１固定部３６と第２固定部３７の夫々を本体部７１の背面に後方から当接させる。このとき、本体部７１の背面の右端側の下部に設けられた突起７１１に対し、固定板３１の第１固定部３６の右端側に設けられた下側の固定穴３６１を係合して位置決めするさらに、本体部７１の背面の左端側の上部に設けられた突起７１３に対し、固定板３１の第２固定部３７の左端側に設けられた上側の固定穴３７１を係合して位置決めする。 An example of a method of assembling the route unit 7 will be described. For convenience of explanation, the orientation of each part when assembling the path unit 7 will be described following the orientation of the state accommodated in the water heater 1 . First, as shown in FIGS. 7 and 8, the assembling operator arranges the fixing plate 31 on the back side of the main body portion 71 of the straightening plate 70 . Each of the first fixing portion 36 and the second fixing portion 37 is brought into contact with the rear surface of the main body portion 71 from behind. At this time, the lower fixing hole 361 provided on the right end side of the first fixing portion 36 of the fixing plate 31 is engaged with the protrusion 711 provided on the lower right end side of the back surface of the main body portion 71 for positioning. Further, the upper fixing hole 371 provided on the left end side of the second fixing portion 37 of the fixing plate 31 is engaged with the projection 713 provided on the upper left end side of the back surface of the main body portion 71 to position it. .

この状態で、第１固定部３６と本体部７１の重合部分Ｗ１（図９参照）をスポット溶接機の一対の電極スローブ（図示略）で前後方向から挟み込み、スポット溶接を行う。重合部分Ｗ１とは、略逆Ｕ字状の第１固定部３６のうち開口側とは反対側の上側部と本体部７１とが重合する部分である。さらに、第２固定部３７と本体部７１の重合部分Ｗ２を、スポット溶接機の一対の電極スローブ（図示略）で前後方向から挟み込み、スポット溶接を行う。重合部分Ｗ２とは、略Ｕ字状の第２固定部３７のうち開口側とは反対側の下側部と本体部７１とが重合する部分である。これにより、本体部７１の背面に固定板３１が固定される（図９参照）。 In this state, the overlapping portion W1 (see FIG. 9) of the first fixing portion 36 and the main body portion 71 is sandwiched between a pair of electrode probes (not shown) of the spot welding machine from the front and rear directions to perform spot welding. The overlapping portion W1 is a portion where the main body portion 71 overlaps with the upper portion of the substantially inverted U-shaped first fixing portion 36 on the side opposite to the opening side. Further, the overlapped portion W2 between the second fixing portion 37 and the main body portion 71 is sandwiched between a pair of electrode probes (not shown) of a spot welder from the front and rear to perform spot welding. The overlapped portion W2 is a portion where the main body portion 71 overlaps with the lower portion of the substantially U-shaped second fixing portion 37 on the side opposite to the opening side. As a result, the fixing plate 31 is fixed to the rear surface of the main body portion 71 (see FIG. 9).

次いで、整流板７０の本体部７１の前面側に固定板３２を配置する。上記の通り、固定板３２の向きは、固定板３１の向きと上下と前後において反対である。第１固定部３６と第２固定部３７の夫々を本体部７１の前面に当接させる。このとき、本体部７１の前面の右端側の上部に設けられた突起７１２に対し、固定板３１の第１固定部３６の右端側に設けられた上側の固定穴３６１を係合して位置決めする。さらに、本体部７１の前面の左端側の下部に設けられた突起７１４に対し、固定板３１の第１固定部３６の左端側に設けられた下側の固定穴３７１を係合して位置決めする。 Next, the fixed plate 32 is arranged on the front side of the main body portion 71 of the straightening plate 70 . As described above, the orientation of the fixing plate 32 is opposite to the orientation of the fixing plate 31 in the top, bottom, front, and rear directions. Each of the first fixing portion 36 and the second fixing portion 37 is brought into contact with the front surface of the main body portion 71 . At this time, the upper fixing hole 361 provided on the right end side of the first fixing portion 36 of the fixing plate 31 is engaged with the protrusion 712 provided on the upper right end side of the front surface of the main body portion 71 for positioning. . Further, the lower fixing hole 371 provided on the left end side of the first fixing portion 36 of the fixing plate 31 is engaged with the protrusion 714 provided on the lower left end side of the front surface of the main body portion 71 to position the fixing plate 31 . .

この状態で、固定板３２の第１固定部３６と本体部７１の重合部分Ｗ３（図１０参照）をスポット溶接機の一対の電極スローブ（図示略）で前後方向から挟み込み、スポット溶接を行う。重合部分Ｗ３とは、略Ｕ字状の第１固定部３６のうち開口側とは反対側の下側部と本体部７１とが重合する部分である。さらに、固定板３２の第２固定部３７と本体部７１の重合部分Ｗ４を、スポット溶接機の一対の電極スローブ（図示略）で前後方向から挟み込み、スポット溶接を行う。重合部分Ｗ４とは、略逆Ｕ字状の第１固定部３６のうち開口側とは反対側の上側部と本体部７１とが重合する部分である。これにより、本体部７１の前面に固定板３２が固定される（図１０参照）。 In this state, the overlapping portion W3 (see FIG. 10) of the first fixing portion 36 of the fixing plate 32 and the main body portion 71 is sandwiched between a pair of electrode probes (not shown) of the spot welder from the front and rear to perform spot welding. The overlapping portion W3 is a portion where the main body portion 71 overlaps with the lower portion of the substantially U-shaped first fixing portion 36 on the side opposite to the opening side. Further, the overlapping portion W4 of the second fixing portion 37 of the fixing plate 32 and the main body portion 71 is sandwiched between a pair of electrode probes (not shown) of a spot welder from the front and rear directions to perform spot welding. The overlapping portion W4 is a portion where the main body portion 71 overlaps with the upper portion of the substantially inverted U-shaped first fixing portion 36 on the side opposite to the opening side. Thereby, the fixing plate 32 is fixed to the front surface of the main body portion 71 (see FIG. 10).

このように、スポット溶接は２枚の金属板を挟み込んで圧力をかけながら電流をかけて溶接する方法である。それ故、固定板３１を本体部７１の背面に固定した後で、固定板３１を本体部７１の前面に固定、若しくはその逆の順序で固定する必要がある。そして、スポット溶接機の一対の電極スローブで挟み込む部分は２枚の金属でなければならない。そこで、本実施形態では、固定板３１，３２の夫々の第１固定部３６と第２固定部３７を略Ｕ字状に形成し、固定板３１，３２を整流板７０の本体部７１の背面と前面に位置決めした際に、夫々の第１固定部３６と第２固定部３７が本体部７１を介して互いに上下が逆向きになるように配置される。これにより、整流板７０を前側から後方に向けて透視してみたとき、固定板３２と本体部７１の重合部分Ｗ３，Ｗ４は、固定板３１と本体部７１の重合部分Ｗ１，Ｗ２と重ならない。従って、重合部分Ｗ１～Ｗ４においては２枚の金属板となるので、夫々の部分をスポット溶接することが可能となり、結果的に整流板７０に対して固定板３１，３２をスポット溶接で固定できる。 Thus, spot welding is a method in which two metal plates are sandwiched between them and an electric current is applied while applying pressure. Therefore, it is necessary to fix the fixing plate 31 to the front surface of the main body portion 71 after fixing the fixing plate 31 to the rear surface of the main body portion 71, or vice versa. Then, the portion sandwiched between the pair of electrode slobs of the spot welder must consist of two pieces of metal. Therefore, in this embodiment, the first fixing portion 36 and the second fixing portion 37 of each of the fixing plates 31 and 32 are formed in a substantially U-shape, and the fixing plates 31 and 32 are arranged on the back surface of the main body portion 71 of the straightening plate 70 . When positioned on the front surface, the first fixing portion 36 and the second fixing portion 37 are arranged to be upside down with respect to each other with the body portion 71 interposed therebetween. As a result, overlapping portions W3 and W4 of the fixing plate 32 and the body portion 71 do not overlap with overlapping portions W1 and W2 of the fixing plate 31 and the body portion 71 when the current plate 70 is seen through from the front side to the rear side. . Therefore, since there are two metal plates in the overlapping portions W1 to W4, the respective portions can be spot-welded, and as a result, the fixed plates 31 and 32 can be fixed to the current plate 70 by spot welding. .

次いで、図１０に示すように、固定板３２が前面に固定された整流板７０の前側に、接続板８０を左右方向に配置する。本体部８１の右端側を、整流板７０の固定片７４の先端部７４１の前面に配置し、本体部８１の右端側に設けた固定穴８７を、整流板７０の固定片７４の突起７８に位置決めする。これと同時に、本体部８１の左端側を、整流板７０の固定片７５の先端部７５１の前面に配置し、本体部８１の左端側に設けた固定穴８８を、整流板７０の固定片７５の突起７９に位置決めする。この状態で、本体部８１の右端側を固定片７４の先端部７４１の前面にスポット溶接を行い、本体部８１の左端側を固定片７５の先端部７５１の前面にスポット溶接を行う。これにより、接続板８０は、整流板７０の固定片７４，７５に固定され、固定片７４，７５の間を左右方向に架設された状態となる（図１１参照）。接続板８０の本体部８１の背面は、固定板３２の中央部３５の前面と当接する。それ故、接続板８０の中央部は、固定板３２、整流板７０、及び固定板３１により安定して支持される。 Next, as shown in FIG. 10, the connection plate 80 is arranged in the left-right direction in front of the straightening plate 70 to which the fixing plate 32 is fixed on the front surface. The right end side of the body portion 81 is placed in front of the tip portion 741 of the fixed piece 74 of the current plate 70 , and the fixing hole 87 provided in the right end side of the body portion 81 is fitted to the projection 78 of the fixed piece 74 of the current plate 70 . position. At the same time, the left end side of the body portion 81 is placed in front of the front end portion 751 of the fixed piece 75 of the current plate 70 , and the fixing hole 88 provided in the left end side of the body portion 81 is inserted into the fixed piece 75 of the current plate 70 . is positioned on the projection 79 of the . In this state, the right end of the main body portion 81 is spot-welded to the front surface of the tip portion 741 of the fixing piece 74 , and the left end side of the main body portion 81 is spot-welded to the front surface of the tip portion 751 of the fixing piece 75 . As a result, the connection plate 80 is fixed to the fixed pieces 74 and 75 of the straightening plate 70, and is placed horizontally between the fixed pieces 74 and 75 (see FIG. 11). The rear surface of the body portion 81 of the connection plate 80 contacts the front surface of the central portion 35 of the fixing plate 32 . Therefore, the central portion of the connection plate 80 is stably supported by the fixed plate 32 , the current plate 70 and the fixed plate 31 .

次いで、図１１に示すように、固定板３１，３２、及び接続板８０が固定された整流板７０を、覆い部２０の前側に配置する。整流板７０の背面に固定された固定板３１の中央部３５の背面を、覆い部２０の後壁２１１の前面に配置する。後壁２１１の前面に設けられた左右一対の突起２３に対し、中央部３５に設けられた左右一対の穴部３５１を位置決めし、前方からスポット溶接を行う。これにより、整流板７０は、固定板３１を介して覆い部２０の後壁２１１の前面に固定される。 Next, as shown in FIG. 11 , the fixing plates 31 and 32 and the straightening plate 70 to which the connection plate 80 is fixed are arranged on the front side of the cover portion 20 . The rear surface of the central portion 35 of the fixed plate 31 fixed to the rear surface of the straightening plate 70 is arranged on the front surface of the rear wall 211 of the cover portion 20 . A pair of left and right holes 351 provided in the central portion 35 are positioned with respect to the pair of left and right projections 23 provided on the front surface of the rear wall 211, and spot welding is performed from the front. As a result, the current plate 70 is fixed to the front surface of the rear wall 211 of the cover portion 20 via the fixing plate 31 .

さらに、接続板８０の右固定部８２を、覆い部２０のフランジ部２２の右側部に設けた凹部２６の前面に配置する。このとき、凹部２６の前面に設けた突起２７に対して、接続板８０の右固定部８２に設けた固定穴８５を位置決めする。また、接続板８０の左固定部８３を、覆い部２０のフランジ部２２の左側部に設けた凹部２６の前面に配置する。このとき、凹部２６の前面に設けた突起２７に対して、接続板８０の左固定部８３に設けた固定穴８６を位置決めする。この状態で、接続板８０の右固定部８２と左固定部８３を対応する左右一対の凹部２６，２６に対してスポット溶接を行う。これにより、接続板８０の右端部と左端部が、覆い部２０のフランジ部２２の右側部と左側部に固定される（図１２参照）。 Furthermore, the right fixing portion 82 of the connection plate 80 is arranged in front of the recess 26 provided on the right side of the flange portion 22 of the cover portion 20 . At this time, the fixing hole 85 provided in the right fixing portion 82 of the connection plate 80 is positioned with respect to the projection 27 provided on the front surface of the recess 26 . Also, the left fixing portion 83 of the connection plate 80 is arranged in front of the recess 26 provided on the left side of the flange portion 22 of the cover portion 20 . At this time, the fixing hole 86 provided in the left fixing portion 83 of the connection plate 80 is positioned with respect to the protrusion 27 provided on the front surface of the recess 26 . In this state, the right fixing portion 82 and the left fixing portion 83 of the connection plate 80 are spot-welded to the corresponding pair of left and right concave portions 26 , 26 . As a result, the right and left ends of the connection plate 80 are fixed to the right and left sides of the flange portion 22 of the cover portion 20 (see FIG. 12).

図１２に示すように、フランジ部２２の前面には、下半部１２１と上半部１２２が夫々形成される。下半部１２１は接続板８０よりも下側部分であり、正面視略Ｕ字状に形成される。上半部１２２は接続板８０よりも上側部分であり、下半部１２１とは上下逆の形状であって、下側に向けて開口する正面視略逆Ｕ字状に形成される。下半部１２１と接続板８０とに囲まれた部分には、導入口１５１が形成される。上半部１２２と接続板８０とに囲まれた部分には、導出口１５２が形成される。導入口１５１及び導出口１５２は、何れも正面視横長の略矩形状である。 As shown in FIG. 12, a lower half portion 121 and an upper half portion 122 are formed on the front surface of the flange portion 22, respectively. The lower half portion 121 is a portion below the connection plate 80 and is formed in a substantially U shape when viewed from the front. The upper half portion 122 is a portion above the connection plate 80, and has a shape that is upside down from the lower half portion 121, and is formed in a generally inverted U shape that opens downward when viewed from the front. An introduction port 151 is formed in a portion surrounded by the lower half portion 121 and the connection plate 80 . A lead-out port 152 is formed in a portion surrounded by the upper half portion 122 and the connection plate 80 . Both the introduction port 151 and the outlet port 152 have a horizontally long substantially rectangular shape when viewed from the front.

導入口１５１は、一次熱交換器５の流出口５３１に対応する。導入口１５１は、流出口５３１から流出する燃焼排気を覆い部２０内に導入する為の開口である。導出口１５２は、二次熱交換器６の流入口６１７に対応する。導出口１５２は、覆い部２０内を通過した燃焼排気を流入口６１７に向けて導出する為の開口である。 The inlet 151 corresponds to the outlet 531 of the primary heat exchanger 5 . The introduction port 151 is an opening for introducing combustion exhaust gas flowing out from the outflow port 531 into the cover portion 20 . Outlet 152 corresponds to inlet 617 of secondary heat exchanger 6 . The outlet port 152 is an opening for leading combustion exhaust that has passed through the cover portion 20 toward the inlet port 617 .

なお、凹部２６の深さは、接続板８０の右固定部８２及び左固定部８３の夫々の板厚と略同一である。よって、図１３に示すように、右固定部８２及び左固定部８３の夫々の前面と、フランジ部２２の前面との段差を小さくできる。各凹部２６の内側において、右固定部８２及び左固定部８３の夫々の外周に生じる隙間Ｑには、シール材２００が塗布される。これにより、各凹部２６の内側は、右固定部８２又は左固定部８３とシール材２００によって水平に埋められるので、フランジ部２２の前面との段差をより小さくできる。 The depth of the concave portion 26 is substantially the same as the plate thickness of each of the right fixing portion 82 and the left fixing portion 83 of the connection plate 80 . Therefore, as shown in FIG. 13, the difference in level between the front surface of each of the right fixing portion 82 and the left fixing portion 83 and the front surface of the flange portion 22 can be reduced. A sealing material 200 is applied to the gap Q generated on the outer periphery of each of the right fixing portion 82 and the left fixing portion 83 inside each recess 26 . As a result, the inside of each concave portion 26 is horizontally filled with the right fixing portion 82 or the left fixing portion 83 and the sealing material 200, so that the difference in level with the front surface of the flange portion 22 can be made smaller.

次いで、図１２に示すように、整流板７０と接続板８０が固定された覆い部２０のフランジ部２２に対して、パッキン９０を前方から接着剤で貼り付ける。図１４に示すように、パッキン９０の枠状部９１は、フランジ部２２の前面に貼り付ける。パッキン９０の板状部９２は、接続板８０の前面に貼り付ける。このとき、枠状部９１の右端部は、接続板８０の右固定部８２のリブ８２１の左面に当接し、枠状部９１の左端部は、接続板８０の左固定部８３のリブ８３１の右面に当接する。板状部９２の上端部は、接続板８０の本体部８１の上端部のリブ８１１の下面に当接し、板状部９２の下端部は、接続板８０の本体部８１の下端部のリブ８１２の下面に当接する。これにより、パッキン９０は、覆い部２０のフランジ部２２及び接続板８０に対して位置がずれるのを防止できる。このようにして、経路ユニット７が完成する。 Next, as shown in FIG. 12, the packing 90 is attached from the front with an adhesive to the flange portion 22 of the cover portion 20 to which the current plate 70 and the connection plate 80 are fixed. As shown in FIG. 14 , the frame-shaped portion 91 of the packing 90 is attached to the front surface of the flange portion 22 . The plate-like portion 92 of the packing 90 is attached to the front surface of the connection plate 80 . At this time, the right end portion of the frame-shaped portion 91 contacts the left surface of the rib 821 of the right fixing portion 82 of the connection plate 80 , and the left end portion of the frame-shaped portion 91 contacts the rib 831 of the left fixing portion 83 of the connection plate 80 . Abut on the right side. The upper end of the plate-like portion 92 abuts on the lower surface of the rib 811 at the upper end of the body portion 81 of the connection plate 80 , and the lower end of the plate-like portion 92 contacts the rib 812 at the lower end of the body portion 81 of the connection plate 80 . abut on the bottom surface of the Thereby, the packing 90 can be prevented from being displaced with respect to the flange portion 22 of the cover portion 20 and the connection plate 80 . Thus, the route unit 7 is completed.

そして、図６に示すように、完成した経路ユニット７を、一次熱交換器５の排気フード５３の後壁５３０、及び二次熱交換器６の後壁６１４に対して後方から押し当てる。このとき、覆い部２０のフランジ部２２の下半部１２１（図１２参照）は、パッキン９０を介して、一次熱交換器５の後壁５３０の後面であって、流出口５３１の右側、左側、及び下側と当接する。フランジ部２２の上半部１２２（図１２参照）は、パッキン９０を介して、二次熱交換器６の後壁６１４の後面であって、流入口６１７の右側、左側、及び上側と当接する。接続板８０の前面は、境界部１０１と当接する。境界部１０１は、流出口５３１と流入口６１７の間の部分である。覆い部２０の前面下側に設けられた導入口１５１は、一次熱交換器５の流出口５３１に対向して配置され、前面上側に設けられた導出口１５２は、二次熱交換器６の流入口６１７に対向して配置される。 Then, as shown in FIG. 6, the completed path unit 7 is pressed against the rear wall 530 of the exhaust hood 53 of the primary heat exchanger 5 and the rear wall 614 of the secondary heat exchanger 6 from behind. At this time, the lower half portion 121 (see FIG. 12) of the flange portion 22 of the cover portion 20 is the rear surface of the rear wall 530 of the primary heat exchanger 5 with the packing 90 interposed therebetween, and is on the right and left sides of the outflow port 531 . , and the underside. The upper half portion 122 (see FIG. 12) of the flange portion 22 abuts the rear surface of the rear wall 614 of the secondary heat exchanger 6 on the right side, the left side, and the upper side of the inlet 617 via the packing 90. . The front surface of the connection plate 80 abuts the boundary portion 101 . Boundary 101 is the portion between outlet 531 and inlet 617 . The introduction port 151 provided on the lower front side of the cover portion 20 is arranged to face the outlet port 531 of the primary heat exchanger 5, and the outlet port 152 provided on the upper front side faces the secondary heat exchanger 6. It is arranged opposite to the inlet 617 .

フランジ部２２に設けられた１０個の固定穴２４は、パッキン９０に設けられた１０個の固定穴９５を介して、一次熱交換器５の後壁５３０に設けられた５個の固定穴５８、及び二次熱交換器６の後壁６１４に設けられた５個の固定穴６８の夫々に配置される。フランジ部２２に設けられた１０個の固定穴２４に対して後方から１０本のビス４５を挿入し、パッキン９０の１０個の固定穴９５を介して、５個の固定穴５８、及び５個の固定穴６８の夫々に締結する。これにより、一次熱交換器５と二次熱交換器６の夫々の後壁５３０，６１４を後方から覆うようにして、経路ユニット７が安定且つ強固に固定される（図３参照）。 Ten fixing holes 24 provided in the flange portion 22 are connected to five fixing holes 58 provided in the rear wall 530 of the primary heat exchanger 5 via ten fixing holes 95 provided in the packing 90 . , and five fixing holes 68 provided in the rear wall 614 of the secondary heat exchanger 6, respectively. Ten screws 45 are inserted from behind into ten fixing holes 24 provided in the flange portion 22, and five fixing holes 58 and five are fastened to each of the fixing holes 68 of . As a result, the path unit 7 is stably and firmly fixed so as to cover the rear walls 530 and 614 of the primary heat exchanger 5 and the secondary heat exchanger 6 from behind (see FIG. 3).

図４，図５に示すように、覆い部２０内において、整流板７０は、膨出部２１の後壁２１１の前面から前側に離間した位置に支持される。整流板７０の本体部７１は、覆い部２０内の空間を前後に区画する。これにより、覆い部２０の内部空間の前側部分に積極的に燃焼排気が導入される。よって、覆い部２０の内部空間に燃焼排気の渦流が発生するのを防止できるので、圧損が生じるのを防止できる。 As shown in FIGS. 4 and 5 , in the cover portion 20 , the straightening plate 70 is supported at a position spaced forward from the front surface of the rear wall 211 of the bulging portion 21 . The body portion 71 of the current plate 70 divides the space inside the cover portion 20 into front and rear portions. As a result, the combustion exhaust is actively introduced into the front portion of the internal space of the cover portion 20 . Therefore, it is possible to prevent the combustion exhaust from swirling in the inner space of the cover portion 20, thereby preventing pressure loss from occurring.

そして、本実施形態では、経路ユニット７のうち、流出口５３１から流入口６１７に向けて燃焼排気が通過する主要部分を、覆い部２０と接続板８０の２部品という極めてシンプル且つ少数の部品で構成できる。これにより、本実施形態は、経路ユニット７の組み立てを容易にできるので、給湯器１の生産性を向上でき且つコストも節約できる。 In the present embodiment, the main portion of the path unit 7 through which the combustion exhaust passes from the outlet 531 toward the inlet 617 is made up of two parts, the cover portion 20 and the connection plate 80, which are extremely simple and have a small number of parts. Configurable. Accordingly, in this embodiment, the path unit 7 can be easily assembled, so that the productivity of the water heater 1 can be improved and the cost can be saved.

また、覆い部２０の膨出部２１の後壁２１１の前面に、固定板３１、整流板７０、及び固定板３２を固定し、その固定板３２に対して接続板８０を固定する。これにより、給湯器１は、ビス４５の締め付け力を、膨出部２１、固定板３１、整流板７０、及び固定板３２を介して、境界部１０１の後方に位置するパッキン９０に効果的に作用させることができる。これにより、給湯器１は、パッキン９０を好適に潰すことができるので、流出口５３１及び流入口６１７の夫々の周辺部、及び流出口５３１と流入口６１７の間の境界部１０１に対して、経路ユニット７を密着させることができる。よって、給湯器１は、簡単な構成であるにも関わらず、燃焼排気の漏出を防止できる。 A fixing plate 31 , a current plate 70 , and a fixing plate 32 are fixed to the front surface of the rear wall 211 of the bulging portion 21 of the cover portion 20 , and the connection plate 80 is fixed to the fixing plate 32 . As a result, the water heater 1 effectively applies the tightening force of the screw 45 to the packing 90 located behind the boundary portion 101 via the bulging portion 21 , the fixing plate 31 , the current plate 70 , and the fixing plate 32 . can work. As a result, since the water heater 1 can suitably crush the packing 90, the peripheral portions of the outflow port 531 and the inflow port 617 and the boundary portion 101 between the outflow port 531 and the inflow port 617 are The route unit 7 can be brought into close contact. Therefore, the water heater 1 can prevent leakage of combustion exhaust gas in spite of its simple configuration.

また、流出口５３１と流入口６１７は、上下方向よりも左右方向に長い矩形状なので、それらの間である境界部１０１のうち、漏れが生じ易い左右方向の中央部を、パッキン９０を介して接続板８０で間接的に抑えることができるので、良好にシールできる。 In addition, since the outflow port 531 and the inflow port 617 have a rectangular shape that is longer in the horizontal direction than in the vertical direction, the central portion in the horizontal direction, where leakage is likely to occur, of the boundary portion 101 between them is placed through the packing 90. Since it can be indirectly suppressed by the connection plate 80, good sealing can be achieved.

接続板８０は、覆い部２０のフランジ部２２の前面に対して、膨出部２１を中央に挟む位置で固定される。これにより、給湯器１は、ビス４５の締め付けの応力をより直接的且つ均一に境界部１０１に作用させることができる。これにより、給湯器１は、覆い部２０のシール性をより向上できる。 The connection plate 80 is fixed to the front surface of the flange portion 22 of the cover portion 20 at a position sandwiching the bulging portion 21 in the center. As a result, the water heater 1 can apply the stress of tightening the screws 45 more directly and uniformly to the boundary portion 101 . Thereby, the water heater 1 can further improve the sealing performance of the cover portion 20 .

フランジ部２２の左右両側に設けられた凹部２６の深さは、接続板８０の右固定部８２及び左固定部８３の夫々の板厚と略同一なので、右固定部８２及び左固定部８３の夫々の前面は、フランジ部２２の前面と面一となる。これにより、パッキン９０をフランジ部２２の前面に密着させることができるので、覆い部２０のシール性をより向上できる。 The depth of the recesses 26 provided on both the left and right sides of the flange portion 22 is substantially the same as the plate thickness of each of the right fixing portion 82 and the left fixing portion 83 of the connection plate 80. Each front surface is flush with the front surface of the flange portion 22 . As a result, the packing 90 can be brought into close contact with the front surface of the flange portion 22, so that the sealing performance of the cover portion 20 can be further improved.

接続板８０の前面には、２本の突状部８４が設けられる。突状部８４は前方に突出し、且つ境界部１０１の長さ方向と平行に延びる。これにより、給湯器１は、境界部１０１に対応するパッキン９０をより好適に潰すことができるので、覆い部２０のシール性をより向上できる。 Two protrusions 84 are provided on the front surface of the connection plate 80 . The projecting portion 84 projects forward and extends parallel to the length direction of the boundary portion 101 . As a result, in the water heater 1, the packing 90 corresponding to the boundary portion 101 can be more suitably crushed, so that the sealing performance of the cover portion 20 can be further improved.

上記説明において、排気フード５３流出口５３１は本発明の「出口部」の一例である、流入口６１７は本発明の「入口部」の一例である。経路ユニット７は本発明の「経路部材」の一例である。覆い部２０は本発明の「本体部」の一例である。接続板８０は本発明の「架設部」の一例である。また、本発明の「顕熱回収部」は、燃焼排気中の顕熱を回収する部分であって、明細書中の本実施例では、一次熱交換器５と排気フード５３を含む概念である。さらに、本発明の「潜熱回収部」は、燃焼排気中の潜熱を回収する部分であって、明細書中の本実施例では、二次熱交換器６を含む概念である。 In the above description, the outflow port 531 of the exhaust hood 53 is an example of the "outlet portion" of the present invention, and the inflow port 617 is an example of the "inlet portion" of the present invention. The route unit 7 is an example of the "route member" of the present invention. The cover part 20 is an example of the "body part" of the present invention. The connection plate 80 is an example of the "bridge section" of the present invention. In addition, the "sensible heat recovery part" of the present invention is a part that recovers the sensible heat in the combustion exhaust, and in this embodiment in the specification, it is a concept including the primary heat exchanger 5 and the exhaust hood 53. . Furthermore, the "latent heat recovery part" of the present invention is a part that recovers latent heat in combustion exhaust gas, and is a concept including the secondary heat exchanger 6 in this embodiment of the specification.

以上説明したように、本実施形態の給湯器１は、一次熱交換器５、二次熱交換器６、経路ユニット７を備える。一次熱交換器５は、燃焼装置４内に収容される複数の濃淡バーナの燃焼排気経路の上流側に設けられる。一次熱交換器５は、周壁５１と排気フード５３を備える。周壁５１内には、左右方向に延びる複数の伝熱管５２が収容される。一次熱交換器５は、周壁５１及び排気フード５３内を流れる燃焼排気の顕熱と伝熱管５２内の通水との熱交換を行う。二次熱交換器６は、燃焼排気経路の下流側で且つ一次熱交換器５の上方に隣接して設けられる。二次熱交換器６は筐体６１を備える。筐体６１内には、左右方向に延びる複数の伝熱管６２が収容される。二次熱交換器６は、筐体６１内を流れる燃焼排気の潜熱と伝熱管６２内の通水との熱交換を行う。一次熱交換器５の排気フード５３の後壁５３０には、後方に向けて開口する流出口５３１が設けられる。二次熱交換器６の筐体６１の後壁６１４には、後方に向けて開口する流入口６１７が設けられる。 As described above, the water heater 1 of this embodiment includes the primary heat exchanger 5, the secondary heat exchanger 6, and the path unit 7. As shown in FIG. The primary heat exchanger 5 is provided on the upstream side of the combustion exhaust path of the plurality of rich-lean burners housed in the combustion device 4 . The primary heat exchanger 5 has a peripheral wall 51 and an exhaust hood 53 . A plurality of heat transfer tubes 52 extending in the left-right direction are accommodated in the peripheral wall 51 . The primary heat exchanger 5 exchanges heat between the sensible heat of the combustion exhaust flowing through the peripheral wall 51 and the exhaust hood 53 and the water flowing through the heat transfer tubes 52 . The secondary heat exchanger 6 is provided adjacently above the primary heat exchanger 5 on the downstream side of the combustion exhaust path. The secondary heat exchanger 6 has a housing 61 . A plurality of heat transfer tubes 62 extending in the left-right direction are accommodated in the housing 61 . The secondary heat exchanger 6 exchanges heat between the latent heat of the combustion exhaust flowing inside the housing 61 and the water flowing inside the heat transfer tube 62 . A rear wall 530 of the exhaust hood 53 of the primary heat exchanger 5 is provided with an outflow port 531 that opens rearward. A rear wall 614 of the housing 61 of the secondary heat exchanger 6 is provided with an inlet 617 that opens rearward.

これら流出口５３１と流入口６１７を覆うようにして後方から経路ユニット７が固定される。経路ユニット７は、流出口５３１から排出される燃焼排気を、流入口６１７を介して筐体６１内に導出する。経路ユニット７は、覆い部２０と接続板８０を備える。覆い部２０は、膨出部２１とフランジ部２２を備える。膨出部２１は後方に膨出する。フランジ部２２は、膨出部２１の前端部から前後左右方向に拡がる。接続板８０は、膨出部の後壁２１１との間に前後方向に所定の隙間を隔てるようにフランジ部２２の左右の両側部間に架設される。接続板８０とフランジ部２２が、パッキン９０を介して、流出口５３１及び流入口６１７の夫々の周辺部と当接する。 The path unit 7 is fixed from behind so as to cover the outflow port 531 and the inflow port 617 . The path unit 7 guides the combustion exhaust discharged from the outflow port 531 into the housing 61 via the inflow port 617 . The path unit 7 has a cover portion 20 and a connection plate 80 . The cover portion 20 has a bulging portion 21 and a flange portion 22 . The bulging portion 21 bulges rearward. The flange portion 22 extends from the front end portion of the bulging portion 21 in the front, rear, left, and right directions. The connection plate 80 is provided between the left and right side portions of the flange portion 22 so as to be separated from the rear wall 211 of the bulging portion by a predetermined gap in the front-rear direction. The connection plate 80 and the flange portion 22 are in contact with the peripheral portions of the outflow port 531 and the inflow port 617 via the packing 90 .

接続板８０と、フランジ部２２の下半部１２１とに囲まれた部分には、導入口１５１が形成される。下半部１２１は、フランジ部２２の前面のうち接続板８０よりも下側部分である。導入口１５１は、流出口５３１に後方から重なって、排気フード５３内の燃焼排気を覆い部２０内に導入する。接続板８０と、フランジ部２２の上半部１２２とに囲まれた部分には、導出口１５２が形成される。上半部１２２は、フランジ部２２の前面のうち接続板８０よりも上側部分である。導出口１５２は、流入口６１７に後方から重なって、覆い部２０内の燃焼排気を二次熱交換器６の筐体６１内に導出する。このように、給湯器１は、覆い部２０と接続板８０という極めてシンプル且つ少数の部品で、経路ユニット７の主要部分を構成できる。これにより、本実施形態は、経路ユニット７を容易に組み立てることができるので、給湯器１の生産性を向上でき且つコストも節約できる。 An introduction port 151 is formed in a portion surrounded by the connection plate 80 and the lower half portion 121 of the flange portion 22 . The lower half portion 121 is a portion of the front surface of the flange portion 22 below the connection plate 80 . The introduction port 151 overlaps the outflow port 531 from behind and introduces the combustion exhaust in the exhaust hood 53 into the cover portion 20 . A lead-out port 152 is formed in a portion surrounded by the connection plate 80 and the upper half portion 122 of the flange portion 22 . The upper half portion 122 is a portion of the front surface of the flange portion 22 above the connection plate 80 . The outlet port 152 overlaps the inlet port 617 from behind and guides the combustion exhaust gas inside the cover portion 20 into the housing 61 of the secondary heat exchanger 6 . Thus, the water heater 1 can constitute the main part of the path unit 7 with a very simple and small number of parts such as the cover part 20 and the connection plate 80 . Accordingly, in this embodiment, the path unit 7 can be easily assembled, so that the productivity of the water heater 1 can be improved and the cost can be saved.

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。一次熱交換器５の周壁５１と排気フード５３は別体であるが、一体であってもよい。流出口５３１と流入口６１７の夫々の形状は矩形状でなくてもよい。覆い部２０のフランジ部２２は、後壁５３０，６１４に対して１０個のビス４５で締結するが、ビス４５の本数、締結する位置は上記実施形態に限定されない。左右方向に延びる伝熱管５２，６２の本数についても限定しない。経路ユニット７のうち、固定板３１，３２、整流板７０は省略してもよい。整流板７０を省略する場合、固定板３１と３２を一体化して、接続板８０の後面に当接させてもよい。パッキン９０も省略してもよいが、覆い部２０と接続板８０を、一次熱交換器５及び二次熱交換器６の夫々の後壁５３０，６１４に密着させる為、パッキン９０を介して当接させるのが望ましい。 The present invention is not limited to the above embodiments, and various modifications are possible. The peripheral wall 51 of the primary heat exchanger 5 and the exhaust hood 53 are separate bodies, but they may be integrated. The shapes of the outlet 531 and the inlet 617 do not have to be rectangular. The flange portion 22 of the cover portion 20 is fastened to the rear walls 530 and 614 with ten screws 45, but the number of screws 45 and fastening positions are not limited to the above embodiment. The number of heat transfer tubes 52, 62 extending in the left-right direction is also not limited. The fixed plates 31 and 32 and the current plate 70 of the path unit 7 may be omitted. When the current plate 70 is omitted, the fixed plates 31 and 32 may be integrated and brought into contact with the rear surface of the connection plate 80 . Although the packing 90 may also be omitted, the packing 90 is interposed in order to bring the cover portion 20 and the connection plate 80 into close contact with the rear walls 530 and 614 of the primary heat exchanger 5 and the secondary heat exchanger 6, respectively. contact is desirable.

また、経路ユニット７の組立方法は上記実施形態に限定されない。上記実施形態では、整流板７０の前後に固定板３１，３２を固定し、さらに接続板８０を前側に固定したものを覆い部２０の前側に固定したが、各部材を固定する順番は変更してもよい。例えば、整流板７０の前後に固定板３１，３２を固定したものを覆い部２０の内側に固定してから、接続板８０を前側から固定してもよい。 Also, the method of assembling the route unit 7 is not limited to the above embodiment. In the above embodiment, the fixing plates 31 and 32 are fixed to the front and rear of the straightening plate 70, and the connecting plate 80 is fixed to the front side, which is fixed to the front side of the cover portion 20. However, the order of fixing each member is not changed. may For example, the connection plate 80 may be fixed from the front side after fixing the fixing plates 31 and 32 to the front and rear of the straightening plate 70 inside the cover portion 20 .

また、給湯器１は、一次熱交換器５の上方に二次熱交換器６を隣接して備えているが、例えば図１５に示すように、二次熱交換器６の代わりに排気ボックス６００を備えた顕熱回収型の給湯器であってもよい。排気ボックス６００は、熱交換器５００の上方に隣接して設けられる。熱交換器５００は一次熱交換器５と同じ構成であり、本発明の「顕熱回収部」の一例である。排気ボックス６００は、二次熱交換器６の筐体６１の内部から伝熱管６２を省略した略箱状である。排気ボックス６００は、経路ユニット７から流れる燃焼排気を受け入れて排気部６３から外部に排出する。排気ボックス６００は、本発明の「排出部」の一例である。この構成の場合、経路ユニット７内の整流板７０（図５参照）は省略し、固定板３１と３２を一体化した一つの固定部材３００とするとよい。このような変形例においても、上記実施形態と同様の効果を得ることができる。 Further, the water heater 1 is provided with a secondary heat exchanger 6 adjacent to and above the primary heat exchanger 5, but instead of the secondary heat exchanger 6, for example, as shown in FIG. It may be a sensible heat recovery type water heater. The exhaust box 600 is provided above and adjacent to the heat exchanger 500 . The heat exchanger 500 has the same configuration as the primary heat exchanger 5, and is an example of the "sensible heat recovery section" of the present invention. The exhaust box 600 has a substantially box-like shape in which the heat transfer pipes 62 are omitted from the inside of the housing 61 of the secondary heat exchanger 6 . The exhaust box 600 receives the combustion exhaust flowing from the path unit 7 and discharges it to the outside through the exhaust portion 63 . Exhaust box 600 is an example of the "exhaust" of the present invention. In the case of this configuration, the current plate 70 (see FIG. 5) in the path unit 7 may be omitted, and the fixing plates 31 and 32 may be integrated into one fixing member 300 . Even in such a modified example, it is possible to obtain the same effect as the above-described embodiment.

１給湯器
５一次熱交換器
６二次熱交換器
７経路ユニット
２０覆い部
２１膨出部
２２フランジ部
５３排気フード
８０接続板
１２１下側部
１２２上側部
５００熱交換器
５３０後壁
５３１流出口
６００排気ボックス
６１４後壁
６１７流入口 REFERENCE SIGNS LIST 1 water heater 5 primary heat exchanger 6 secondary heat exchanger 7 path unit 20 cover portion 21 bulging portion 22 flange portion 53 exhaust hood 80 connection plate 121 lower portion 122 upper portion 500 heat exchanger 530 rear wall 531 outlet 600 exhaust box 614 rear wall 617 inlet

Claims

a sensible heat recovery unit provided on the upstream side of an exhaust path through which combustion exhaust gas of the burner flows, for heat exchange between the sensible heat of the combustion exhaust gas and water flow;
a latent heat recovery unit provided downstream of the exhaust path and above the sensible heat recovery unit for heat exchange between the latent heat of the combustion exhaust that has passed through the sensible heat recovery unit and water flow;
An outlet portion provided at the rear portion of the sensible heat recovery portion and opening toward the rear is connected to an inlet portion provided at the rear portion of the latent heat recovery portion and opening toward the rear, and the heat is discharged from the outlet portion. a path member for guiding the combustion exhaust gas into the latent heat recovery part through the inlet part,
The path member is
a body portion including a bulging portion that bulges rearward, and a flange portion that extends from a front end portion of the bulging portion in the front, rear, left, and right directions;
a bridging portion bridging between both left and right sides of the flange portion so as to separate a predetermined gap in the front-rear direction from the rear wall of the bulging portion,
The bridging portion and the flange portion are in contact with peripheral portions of the outlet portion and the inlet portion, respectively;
A portion surrounded by the bridging portion and a lower half portion of the flange portion that is lower than the bridging portion overlaps the outlet portion from the rear so that the combustion exhaust in the sensible heat recovery portion is diverted to the An introduction port is formed for introducing into the path member,
A portion surrounded by the bridging portion and an upper half portion of the flange portion above the bridging portion overlaps the inlet portion from behind to recover the latent heat from the combustion exhaust in the path member. 1. A water heater, characterized in that an outlet for leading out to the inside is formed.

a sensible heat recovery unit provided on the upstream side of an exhaust path through which combustion exhaust gas of the burner flows, for heat exchange between the sensible heat of the combustion exhaust gas and water flow;
a discharge section provided downstream of the exhaust path and above the sensible heat recovery section for receiving the combustion exhaust gas that has passed through the sensible heat recovery section and discharging it to the outside;
An outlet portion provided at the rear portion of the sensible heat recovery portion and opening toward the rear is connected to an inlet portion provided at the rear portion of the discharge portion and opening toward the rear, and the heat is discharged from the outlet portion. a path member for guiding the combustion exhaust into the discharge section through the inlet section,
The path member is
a body portion including a bulging portion that bulges rearward, and a flange portion that extends from a front end portion of the bulging portion in the front, rear, left, and right directions;
a bridging portion bridging between both left and right sides of the flange portion so as to separate a predetermined gap in the front-rear direction from the rear wall of the bulging portion,
The bridging portion and the flange portion are in contact with peripheral portions of the outlet portion and the inlet portion, respectively;
A portion surrounded by the bridging portion and a lower half portion of the flange portion that is lower than the bridging portion overlaps the outlet portion from the rear so that the combustion exhaust in the sensible heat recovery portion is diverted to the An introduction port is formed for introducing into the path member,
A portion surrounded by the bridging portion and an upper half portion of the flange portion above the bridging portion overlaps the inlet portion from the rear to allow the combustion exhaust in the path member to flow into the discharge portion. A water heater characterized by forming an outlet for leading out to.