JP2020094704A

JP2020094704A - Water heater

Info

Publication number: JP2020094704A
Application number: JP2018230881A
Authority: JP
Inventors: 賢祐山口; Kensuke Yamaguchi
Original assignee: Paloma Co Ltd
Current assignee: Paloma Co Ltd
Priority date: 2018-12-10
Filing date: 2018-12-10
Publication date: 2020-06-18
Anticipated expiration: 2038-12-10
Also published as: JP7250309B2

Abstract

To provide a water heater capable of preventing rainwater having entered an exhaust casing from entering the water heater beyond a rear part of a distributing plate.SOLUTION: A distributing plate 50 in an exhaust casing 40 comprises a lower plate part 51 and an upper plate part 52. The lower plate part 51 is inclined obliquely upward from a front side to a rear side. The upper plate part 52 is bent and folded back from the rear part to the front part of the lower plate part 51, and inclined downward toward the front side. A rain protection part 80 is fixed on an upper surface of the upper plate part 52. The rain protection part 80 receives rainwater entering from outside through an exhaust outlet. Consequently, even if rainwater enters the exhaust casing 40 at a small angle through the exhaust outlet 92, the rainwater is reflected more on the side of the exhaust outlet 92 than in the absence of the rain protection part 80, and above the upper plate part 52. The rainwater thereby collides against an upper part of the exhaust casing 40, and is then prevented from entering a housing beyond a rear part of the distributing plate 50.SELECTED DRAWING: Figure 2

Description

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

従来、筐体の上部に排気部を備えた給湯器が知られている（例えば、特許文献１参照）。排気部は、熱交換器の中ケーシングの上側に固定され、前面が開口して左右及び後部を覆うカバー状の排気ケーシングと、その排気ケーシングの内部に設けられる整流板とを備える。 BACKGROUND ART Heretofore, there has been known a water heater having an exhaust part on an upper part of a housing (see, for example, Patent Document 1). The exhaust unit is fixed to the upper side of the middle casing of the heat exchanger, and includes a cover-shaped exhaust casing having a front surface opened to cover the left and right and rear portions, and a rectifying plate provided inside the exhaust casing.

特開２０１８−３１４８９号公報JP, 2008-31489, A

しかしながら、特許文献１に記載の給湯器において、排気部に対し、雨水が浅い角度で侵入した場合、侵入角度が深い場合に比べ、排気ケーシングの内壁や整流板に衝突することなく、整流板の後部を超えて排気ケーシングの奥側に雨水が入り込む可能性があった。特に、給湯器の薄型化に伴い、排気ケーシングの前後方向の長さが短くなったり、燃焼音、及び燃焼振動を抑制する為、通過面積を広くした場合に、その可能性はさらに高くなることが予想される。 However, in the water heater described in Patent Document 1, when the rainwater enters the exhaust part at a shallow angle, the rainwater does not collide with the inner wall of the exhaust casing or the rectifying plate as compared with the case where the entering angle is deep, and There was a possibility that rainwater would enter the back of the exhaust casing beyond the rear part. In particular, as the water heater becomes thinner, the length of the exhaust casing in the front-rear direction becomes shorter and the possibility of combustion noise and combustion vibration is suppressed. Is expected.

本発明の目的は、排気ケーシング内に侵入した雨水が整流板の後部を超えて、給湯器内に入り込むのを防止できる給湯器を提供することである。 An object of the present invention is to provide a water heater that can prevent rainwater that has entered the exhaust casing from entering the inside of the water heater beyond the rear portion of the rectifying plate.

請求項１の給湯器は、バーナからの燃焼排気の熱によって通水を加熱する熱交換器の上方に設けられ、前部が前記熱交換器よりも前方へ張り出し、前記熱交換器を上方に通過した前記燃焼排気を排出する開口を前記前部に備えた排気ケーシングと、前記開口から前方に突出し、前記開口から排出された前記燃焼排気を、前端部に形成された排気出口から外部に排出する排気筒と、前記排気ケーシング内に支持され、前記熱交換器を上方に通過した前記燃焼排気を受けて前記開口に向けて整流する整流板とを備えた給湯器において、前記整流板は、前側から後側になるにつれて斜め上方に傾斜する下板部と、前記下板部の後部から前方に屈曲して折り返した後、前側になるにつれて下方に傾斜し、前記排気出口の下縁部に向けて延びる上板部とを備え、前記上板部の上面には、当該上面よりも上方で、前記排気出口を介して外部から入射する雨水を受ける雨除け部が設けられたことを特徴とする。 The water heater according to claim 1 is provided above a heat exchanger that heats water by heat of combustion exhaust gas from a burner, and a front portion projects forward from the heat exchanger so that the heat exchanger moves upward. An exhaust casing having an opening at the front portion for discharging the passing combustion exhaust gas, and the combustion exhaust gas that is projected forward from the opening and is discharged from the opening is discharged to the outside from an exhaust outlet formed at the front end portion. In the water heater provided with an exhaust pipe, and a rectifying plate that is supported in the exhaust casing and receives the combustion exhaust that has passed through the heat exchanger upward and rectifies the exhaust gas toward the opening, the rectifying plate is A lower plate portion that is inclined obliquely upward from the front side to the rear side, and is bent forward from the rear portion of the lower plate portion and then folded back, and is inclined downward as the front side is provided, at the lower edge portion of the exhaust outlet. An upper plate part extending toward the upper plate part, and a rain shelter part provided on the upper surface of the upper plate part for receiving rain water incident from the outside through the exhaust outlet, above the upper surface. To do.

請求項２の給湯器は、前記排気筒の前記排気出口から前記上板部の上面に延ばした仮想線を、前記排気出口を介して外部から前記雨水が入射する仮想入射線とし、当該仮想入射線と前記上板部の前記上面との仮想交点で前記仮想入射線と同一角度で反射する仮想線を、前記雨水が反射する仮想反射線とし、前記仮想入射線の入射角度を大きい方から小さい方に変化させたときに、前記仮想反射線が前記上板部の前記上面であって、前記仮想交点を除く部分と最初に接するときの前記上板部における前記仮想交点を基準点とした場合、前記雨除け部は、少なくとも当該基準点の上方を覆うようにして設けるとよい。 The water heater according to claim 2, wherein an imaginary line extending from the exhaust outlet of the exhaust pipe to the upper surface of the upper plate portion is a virtual incident line through which the rainwater enters from the outside through the exhaust outlet. A virtual line that is reflected at the same angle as the virtual incident line at a virtual intersection between the line and the upper surface of the upper plate portion is a virtual reflection line that reflects the rainwater, and the incident angle of the virtual incident line is smaller from the larger one. When the virtual reflection line is the upper surface of the upper plate portion when changed to one direction, and the virtual intersection point in the upper plate portion when first contacting a portion excluding the virtual intersection point is used as a reference point. The rain shield may be provided so as to cover at least the reference point.

請求項３の給湯器の前記排気ケーシングは、後部において上方に立ち上がり、前方に湾曲して延びる後方湾曲部と、前記後方湾曲部の前部から前記排気出口に向かって下方に傾斜する傾斜部とを備え、前記雨除け部は、自身の上面に入射して反射した前記雨水が、前記排気ケーシングの前記傾斜部の下面に衝突する高さ位置に設けるとよい。 The exhaust casing of the water heater according to claim 3, wherein a rear curved portion that rises upward at a rear portion and extends to be curved forward, and an inclined portion that is inclined downward from a front portion of the rear curved portion toward the exhaust outlet. The rain shield part may be provided at a height position where the rainwater incident on and reflected from the upper surface of the rain cover part collides with the lower surface of the inclined part of the exhaust casing.

請求項４の給湯器の前記上板部は、前側に向けて前記下板部よりも急勾配で下り傾斜する第一傾斜部と、前記第一傾斜部の前記前端部から前記第一傾斜部よりも緩やかな勾配で下り傾斜し、前記開口の前記下縁部に向けて延びる第二傾斜部とを備え、前記雨除け部は、前記第二傾斜部に設けるとよい。 The upper plate portion of the water heater according to claim 4, wherein the upper plate portion is inclined downward toward the front side at a steeper gradient than the lower plate portion, and the first inclined portion from the front end portion of the first inclined portion. It is preferable that the rain shield part is provided on the second sloped part, and the second sloped part is inclined downward at a gentler gradient and extends toward the lower edge part of the opening.

請求項５の給湯器の前記雨除け部は、前記上板部の前記上面と、前記上面と対向する前記排気ケーシングの下面との高さ方向の中間部よりも下方に設けるとよい。 It is preferable that the rain shield part of the water heater according to claim 5 is provided below an intermediate part in the height direction between the upper surface of the upper plate part and the lower surface of the exhaust casing facing the upper surface.

請求項１の給湯器によれば、排気筒の排気出口を介して浅い角度で雨水が排気ケーシング内に入射したとしても、その雨水は、雨除け部が無い場合よりも排気出口側で、且つ上板部よりも上方の位置で反射する。よって、雨水は、排気ケーシングの上部に衝突するので、排気部の後部を超えて、給湯器内に侵入するのを防止できる。なお、「浅い角度で雨水が排気ケーシング内に入射」について、垂直落下方向に近ければ近いほど、排気出口に対する入射角度は深く、水平方向に近ければ近いほど、排気出口に対する入射角度は浅いことを意味する。また、排気出口に対する入射角度が浅ければ浅いほど、整流板の上板部に対する入射角度は小さくなる。 According to the water heater of claim 1, even if rainwater enters the exhaust casing through the exhaust outlet of the exhaust stack at a shallow angle, the rainwater is on the exhaust outlet side more than when the rain shield is not provided, and It reflects at a position above the upper plate. Therefore, the rainwater collides with the upper portion of the exhaust casing, so that it is possible to prevent the rainwater from entering the hot water heater beyond the rear portion of the exhaust portion. As for "rainwater enters the exhaust casing at a shallow angle", the closer it is to the vertical fall direction, the deeper the incident angle to the exhaust outlet, and the closer it is to the horizontal direction, the shallower the incident angle to the exhaust outlet. means. Further, the shallower the incident angle with respect to the exhaust outlet, the smaller the incident angle with respect to the upper plate portion of the straightening plate.

請求項２の給湯器によれば、仮想入射線の入射角度を大きい方から小さい方に変化させたときに、仮想反射線が上板部の上面に最初に接するときの上板部における仮想交点を基準点とし、その上方を覆うようにして雨除け部を設ける。これにより、雨除け部が無い場合に排気ケーシングの奥側に入り込んでしまう雨水を、雨除け部で受けることができるので、排気ケーシングの上部に確実に衝突させることができる。 According to the water heater of claim 2, when the incident angle of the virtual incident line is changed from the larger one to the smaller one, the virtual intersection point in the upper plate portion when the virtual reflection line first contacts the upper surface of the upper plate portion. With the reference point as the reference point, a rain shield is provided so as to cover the upper part. With this configuration, rainwater that enters the back side of the exhaust casing when there is no rain shield can be received by the rain shield, so that the rainwater can be reliably collided with the upper portion of the exhaust casing.

請求項３の給湯器によれば、雨除け部の上面に反射した雨水は、排気ケーシングの下面のうち傾斜部の下面に衝突し、傾斜部の下面を伝って排気出口側に流れる。これにより、雨水が整流板の後部を超えて、給湯器内に侵入するのを防止できる。 According to the water heater of claim 3, the rainwater reflected on the upper surface of the rain shield collides with the lower surface of the inclined portion of the lower surface of the exhaust casing, flows along the lower surface of the inclined portion, and flows toward the exhaust outlet side. As a result, rainwater can be prevented from exceeding the rear portion of the straightening vane and entering the water heater.

請求項４の給湯器によれば、雨除け部は緩傾斜部に設けられるので、上板部の後部で前方に折り返された燃焼排気が雨除け部に移動するまでの助走距離を長くできる。よって、雨除け部が燃焼排気の流れを妨げるのを抑制できるので、燃焼排気を排気口から円滑に排出できる。 According to the water heater of the fourth aspect, since the rain shield is provided on the gently sloped portion, it is possible to lengthen the run-up distance until the combustion exhaust folded back forward at the rear of the upper plate moves to the rain shield. Therefore, it is possible to suppress the rain shelter from obstructing the flow of the combustion exhaust gas, so that the combustion exhaust gas can be smoothly discharged from the exhaust port.

請求項５の給湯器によれば、上板部の上方を通過する燃焼排気の流れを妨げるのを防止できるので、燃焼排気を円滑に排出できる。 According to the water heater of claim 5, it is possible to prevent the flow of the combustion exhaust passing above the upper plate portion from being obstructed, so that the combustion exhaust can be smoothly discharged.

給湯器１の断面図である。It is a sectional view of the water heater 1. 排気部３０周辺の断面図である。FIG. 3 is a cross-sectional view around an exhaust unit 30. 整流板５０の平面図である。6 is a plan view of the current plate 50. FIG. 排気ケーシング４０内に降り込んだ雨水Ａ１、Ａ２の各経路を示す図（雨除け部は省略）である。It is a figure (rain shield part is abbreviate|omitted) which shows each path|route of rainwater A1, A2 which fell in the exhaust casing 40. 排気ケーシング４０内に降り込んだ雨水Ａ３、Ａ４、Ａ５の各経路を示す図（雨除け部は省略）である。It is a figure which shows each path|route of rainwater A3, A4, A5 which fell in the exhaust casing 40 (a rain shelter part is abbreviate|omitted). 排気ケーシング４０内に降り込んだ雨水の仮想入射線Ｐ、反射点Ｑ１、Ｑ２、仮想反射線Ｒ１、Ｒ２を示す図である。It is a figure which shows the virtual incident line P of rainwater which descended in the exhaust casing 40, the reflection points Q1, Q2, and the virtual reflection lines R1, R2.

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。 Hereinafter, embodiments of the present invention will be described. Unless otherwise specified, the structure of the device described below is not intended to be limited thereto and is merely an example. The drawings are used for explaining the technical features that can be adopted by the present invention. In the following description, left and right, front and rear, and up and down indicated by arrows in the drawing will be used.

図１を参照し、給湯器１の構造を説明する。給湯器１は、筐体２とフロントカバー８を備える。筐体２の前面には開口７が設けられる。フロントカバー８は、筐体２の前面に着脱可能であって、開口７を閉塞する。フロントカバー８の上部には、排気筒９が前方に突出し、下部には吸気口（図示略）が設けられる。筐体２の底板４には、外部の給湯栓へ繋がる出湯口１１、外部から水道管が接続される入水口１２、外部からガス管が接続されるガス入口（図示略）が夫々設けられる。筐体２の背板６の上部と下部には、壁取付用の金具１６Ａ、１６Ｂが夫々設けられる。 The structure of the water heater 1 will be described with reference to FIG. The water heater 1 includes a housing 2 and a front cover 8. An opening 7 is provided on the front surface of the housing 2. The front cover 8 is removable from the front surface of the housing 2 and closes the opening 7. An exhaust pipe 9 projects forward from an upper portion of the front cover 8, and an intake port (not shown) is provided at a lower portion. The bottom plate 4 of the housing 2 is provided with a hot water outlet 11 connected to an external hot water supply tap, a water inlet 12 connected to a water pipe from the outside, and a gas inlet (not shown) connected to a gas pipe from the outside. Metal fittings 16A and 16B for wall mounting are provided on the upper and lower portions of the back plate 6 of the housing 2, respectively.

筐体２内の上部には、内胴１７が設けられる。内胴１７は、内部において下方から順に、バーナユニット１８、熱交換器１９、排気部３０を備える。バーナユニット１８は、熱交換器１９と連通する下ケーシング２１を有し、下ケーシング２１の下部に複数のバーナ１８１を左右方向に並べて備える。下ケーシング２１の手前側には、ノズル台２２が設けられる。ノズル台２２は、各バーナ１８１に設けた混合管１８２の後端に向けて設置され、ガス入口にガス管（図示略）を介して接続されるノズル２２１を支持する。バーナユニット１８の下方には、各バーナ群に燃焼用空気を供給する給気ファン２５が設けられる。 An inner case 17 is provided on the top of the housing 2. The inner case 17 includes a burner unit 18, a heat exchanger 19, and an exhaust unit 30 in order from the inside from the bottom. The burner unit 18 has a lower casing 21 that communicates with the heat exchanger 19, and a plurality of burners 181 are arranged side by side in the left-right direction at the lower portion of the lower casing 21. A nozzle base 22 is provided on the front side of the lower casing 21. The nozzle base 22 is installed toward the rear end of the mixing pipe 182 provided in each burner 181, and supports the nozzle 221 connected to the gas inlet via a gas pipe (not shown). Below the burner unit 18, an air supply fan 25 that supplies combustion air to each burner group is provided.

熱交換器１９は、左右方向に所定間隔をおいて複数枚積層したフィン（図示略）を左右方向に貫通し、中ケーシング２６内部で平行に配設される複数の伝熱管１９Ａを有する。隣接する伝熱管１９Ａ同士は、中ケーシング２６の外部でＵ字状の接続管（図示略）によって連結されることで、蛇行状に繋がる一連の管体を形成する。熱交換器１９の管体の上流端には、入水口１２と接続される入水管２７の下流端が接続され、当該管体の下流端には、出湯口１１に接続される出湯管（図示略）が接続される。バーナユニット１８からの燃焼排気が伝熱管１９Ａ同士の隙間を通過することによって、伝熱管１９Ａの通水との間で熱交換が行われ、伝熱管１９Ａの通水が加熱される。 The heat exchanger 19 has a plurality of heat transfer tubes 19</b>A arranged in parallel inside the middle casing 26, penetrating in the left and right directions through a plurality of fins (not shown) that are laminated at predetermined intervals in the left and right direction. The adjacent heat transfer tubes 19A are connected to each other outside the middle casing 26 by a U-shaped connecting tube (not shown), thereby forming a series of tube bodies connected in a meandering shape. The upstream end of the pipe of the heat exchanger 19 is connected to the downstream end of the water inlet pipe 27 connected to the water inlet 12, and the downstream end of the pipe is connected to the hot water outlet 11 (shown in the figure). Is omitted) is connected. When the combustion exhaust gas from the burner unit 18 passes through the gap between the heat transfer tubes 19A, heat is exchanged with the water passing through the heat transfer tubes 19A, and the water passing through the heat transfer tubes 19A is heated.

排気部３０は、排気ケーシング４０と整流板５０を備える。排気ケーシング４０は、中ケーシング２６の上部に固定され、排気筒９と連通する。排気ケーシング４０は、前部が熱交換器１９よりも前方へ張り出す。整流板５０は、排気ケーシング４０内に支持され、熱交換器１９から排気ケーシング４０内に流入した燃焼排気の排気通路を形成する。 The exhaust unit 30 includes an exhaust casing 40 and a rectifying plate 50. The exhaust casing 40 is fixed to the upper portion of the middle casing 26 and communicates with the exhaust pipe 9. The front portion of the exhaust casing 40 projects forward of the heat exchanger 19. The baffle plate 50 is supported in the exhaust casing 40, and forms an exhaust passage for the combustion exhaust that has flowed into the exhaust casing 40 from the heat exchanger 19.

図２を参照し、排気ケーシング４０の形状を説明する。排気ケーシング４０は、後部において上方に膨出し、前方へ向かうに従って徐々に低くなる形状を備える。排気ケーシング４０は前部に開口４００を有する。開口４００は、正面視下側に開口する略コの字型である。排気ケーシング４０は、後方から前方にかけて順に、湾曲部４１、最上部４２、急傾斜部４３、緩傾斜部４４を備え、それらの左右両側に一対の側面部４５（図２では、左側の側面部４５のみ図示）を備える。湾曲部４１は、上方に立ち上がりつつ前方に湾曲する。最上部４２は、湾曲部４１の前端部から前方に向けて略水平に延びる。急傾斜部４３は、最上部４２の前端部から急な角度で斜め下方に傾斜する。緩傾斜部４４は、急傾斜部４３の前端部から急傾斜部４３よりも緩い角度で傾斜し、前方に延びる。一対の側面部４５は、湾曲部４１、最上部４２、急傾斜部４３、緩傾斜部４４の左右両端部から垂下し、排気ケーシング４０の左右の両側面を形成する。 The shape of the exhaust casing 40 will be described with reference to FIG. The exhaust casing 40 has a shape that bulges upward at the rear portion and gradually lowers toward the front. The exhaust casing 40 has an opening 400 at the front. The opening 400 has a substantially U-shape that opens downward when viewed from the front. The exhaust casing 40 is provided with a curved portion 41, an uppermost portion 42, a steeply inclined portion 43, and a gently inclined portion 44 in this order from the rear to the front, and a pair of side surface portions 45 (left side surface portion in FIG. 2) on both left and right sides thereof. (Only 45 is shown). The bending portion 41 bends forward while rising upward. The uppermost portion 42 extends substantially horizontally from the front end of the curved portion 41 toward the front. The steeply inclined portion 43 is inclined obliquely downward from the front end portion of the uppermost portion 42 at a steep angle. The gently sloping portion 44 inclines from the front end portion of the steeply sloping portion 43 at a gentler angle than the steeply sloping portion 43 and extends forward. The pair of side surface portions 45 hang down from the left and right end portions of the curved portion 41, the uppermost portion 42, the steep slope portion 43, and the gentle slope portion 44, and form the left and right side surfaces of the exhaust casing 40.

排気ケーシング４０は、取付フランジ部４６、上側フランジ部４７、外側折返部４８、加締め部４９を更に備える。取付フランジ部４６は、排気ケーシング４０の前端部であって、緩傾斜部４４の前端部と、一対の側面部４５の夫々の前端部とに沿って設けられる。取付フランジ部４６は、外側に向かってフランジ状に突出し、正面視下方に開口する略コの字型に形成される。上側フランジ部４７は、湾曲部４１の下端部と、一対の側面部４５の夫々の下端部とに沿って設けられる。上側フランジ部４７は、外側に向かってフランジ状に突出し、底面視前方に開口する略コの字型に形成される。外側折返部４８は、上側フランジ部４７の外周部に沿って設けられ、下方に折り返して突出する。加締め部４９は、外側折返部４８の下端部に沿って設けられる。上側フランジ部４７の下側に、中ケーシング２６の上端部に設けられた下側フランジ部２６１を配置し、加締め部４９を内側に折り曲げて加締め固定する。これにより、中ケーシング２６の上部に、排気ケーシング４０が固定される。 The exhaust casing 40 further includes a mounting flange portion 46, an upper flange portion 47, an outer folding portion 48, and a crimp portion 49. The mounting flange portion 46 is a front end portion of the exhaust casing 40, and is provided along the front end portion of the gently sloped portion 44 and the front end portions of the pair of side surface portions 45. The mounting flange portion 46 is formed in a substantially U-shape that protrudes outward in a flange shape and opens downward in a front view. The upper flange portion 47 is provided along the lower end portion of the curved portion 41 and the lower end portions of the pair of side surface portions 45. The upper flange portion 47 is formed in a substantially U-shape that protrudes outward in a flange shape and opens forward in bottom view. The outer folded portion 48 is provided along the outer peripheral portion of the upper flange portion 47, and is folded back and projected. The caulking portion 49 is provided along the lower end portion of the outer side folding portion 48. The lower flange portion 261 provided at the upper end portion of the middle casing 26 is arranged below the upper flange portion 47, and the caulking portion 49 is bent inward and fixed by caulking. As a result, the exhaust casing 40 is fixed to the upper portion of the middle casing 26.

一対の側面部４５の夫々には、上側挟持部４５１と下側挟持部４５２が設けられる。上側挟持部４５１は、側面部４５における最上部４２の近傍に設けられ、内側に向けて略矩形状に突出する。上側挟持部４５１の下面には、整流板５０の後述する上板部５２の上面が接触する。なお、上側挟持部４５１は絞り加工で形成するとよい。下側挟持部４５２は、上側挟持部４５１の下方で且つ後方寄りに設けられ、内側に向けて略矩形状に突出する。下側挟持部４５２の上面は、前側に下り傾斜する。下側挟持部４５２の下面には、整流板５０の後述する下板部５１の下面が接触する。これにより、上側挟持部４５１と下側挟持部４５２は、整流板５０の後部を上下両側から挟み込んで支持する。 An upper sandwiching portion 451 and a lower sandwiching portion 452 are provided on each of the pair of side surface portions 45. The upper sandwiching portion 451 is provided in the vicinity of the uppermost portion 42 of the side surface portion 45 and projects inward in a substantially rectangular shape. The upper surface of the later-described upper plate portion 52 of the current plate 50 contacts the lower surface of the upper sandwiching portion 451. Note that the upper holding portion 451 may be formed by drawing. The lower sandwiching portion 452 is provided below the upper sandwiching portion 451 and near the rear side, and projects inward in a substantially rectangular shape. The upper surface of the lower holding part 452 is inclined downward to the front side. The lower surface of the lower sandwiching portion 452 contacts the lower surface of the lower plate portion 51 of the rectifying plate 50, which will be described later. As a result, the upper sandwiching portion 451 and the lower sandwiching portion 452 sandwich and support the rear portion of the straightening plate 50 from both upper and lower sides.

最上部４２の上面には、側面視略Ｌ字状のブラケット５５の一端部がネジ３８で固定される。ブラケット５５の他端部は、筐体２の背板６にネジ（図示略）で固定される。これにより、排気ケーシング４０は、筐体２の背面に固定される。 One end of a bracket 55, which is substantially L-shaped in side view, is fixed to the upper surface of the uppermost portion 42 with a screw 38. The other end of the bracket 55 is fixed to the back plate 6 of the housing 2 with a screw (not shown). As a result, the exhaust casing 40 is fixed to the back surface of the housing 2.

図２、図３を参照し、整流板５０の形状を説明する。整流板５０は、下板部５１、上板部５２、雨除け部８０を備える。下板部５１は、平面視略矩形状に形成され、前側から後側になるにつれて斜め上方に傾斜する。下板部５１の後端部には、上方に略直角に屈曲する下側係合部５１１が設けられる。下板部５１の前端部には、前方に向けて略水平に延び、その先端側が下方に略直角に折り返した側面視略逆Ｌ字状の取付片５１２が設けられる。下板部５１の前側の領域には、三つの支持部５１３（図２では一つのみ図示）が左右方向に間隔をあけて設けられる。支持部５１３は、平面視略矩形状で上方に突出する。支持部５１３の上面には、後述する上板部５２の下面が接触する。これにより、支持部５１３は、上板部５２を支持する。 The shape of the current plate 50 will be described with reference to FIGS. 2 and 3. The current plate 50 includes a lower plate portion 51, an upper plate portion 52, and a rain shield 80. The lower plate portion 51 is formed in a substantially rectangular shape in a plan view and is inclined obliquely upward from the front side toward the rear side. At the rear end portion of the lower plate portion 51, a lower engagement portion 511 that bends upward at a substantially right angle is provided. At the front end portion of the lower plate portion 51, a mounting piece 512 is provided that extends substantially horizontally toward the front and has a tip end side that is folded back at a substantially right angle and has a substantially inverted L shape in a side view. In the area on the front side of the lower plate portion 51, three support portions 513 (only one is shown in FIG. 2) are provided at intervals in the left-right direction. The support portion 513 has a substantially rectangular shape in a plan view and protrudes upward. The lower surface of the upper plate portion 52, which will be described later, contacts the upper surface of the support portion 513. Thereby, the support portion 513 supports the upper plate portion 52.

上板部５２は、下板部５１の上側に支持され、平面視略矩形状に形成される。上板部５２の後端部には、下方に屈曲する上側係合部５２１が設けられる。上側係合部５２１は、下板部５１の下側係合部５１１と係合する。上板部５２は、後方から順に、傾斜部６１、水平部６２、後側傾斜部６３、前側傾斜部６４を備える。傾斜部６１は、平面視略矩形状であって、上側係合部５２１の上端部から前側に向かって上り傾斜する。水平部６２は、傾斜部６１の上端部から前側に向かって略水平に延び、排気ケーシング４０の最上部４２の下面と対向する。 The upper plate portion 52 is supported on the upper side of the lower plate portion 51 and is formed in a substantially rectangular shape in plan view. An upper engagement portion 521 that bends downward is provided at a rear end portion of the upper plate portion 52. The upper engagement portion 521 engages with the lower engagement portion 511 of the lower plate portion 51. The upper plate portion 52 includes an inclined portion 61, a horizontal portion 62, a rear inclined portion 63, and a front inclined portion 64 in order from the rear. The inclined portion 61 has a substantially rectangular shape in a plan view and is inclined upward from the upper end of the upper engagement portion 521 toward the front side. The horizontal portion 62 extends substantially horizontally from the upper end portion of the inclined portion 61 toward the front side and faces the lower surface of the uppermost portion 42 of the exhaust casing 40.

後側傾斜部６３は、水平部６２の前端部から急な角度で斜め下方に傾斜する。後側傾斜部６３の傾斜角度は、排気ケーシング４０の急傾斜部４３の傾斜角度と略同一である。後側傾斜部６３は、排気ケーシング４０の急傾斜部４３の下方に位置し、且つその下面と対向する。前側傾斜部６４は、後側傾斜部６３の前端部から後側傾斜部６３よりも緩い角度で傾斜し、排気ケーシング４０の開口４００から前方に突出する。下板部５１の下側係合部５１１、上板部５２の上側係合部５２１、傾斜部６１は、整流板５０の後端部に略Ｕ字状の折り返し部を形成する。 The rear slanted portion 63 is slanted obliquely downward from the front end of the horizontal portion 62 at a steep angle. The inclination angle of the rear inclined portion 63 is substantially the same as the inclination angle of the steep inclined portion 43 of the exhaust casing 40. The rear inclined portion 63 is located below the steep inclined portion 43 of the exhaust casing 40 and faces the lower surface thereof. The front-side inclined portion 64 is inclined from the front end portion of the rear-side inclined portion 63 at a smaller angle than the rear-side inclined portion 63, and projects forward from the opening 400 of the exhaust casing 40. The lower engagement portion 511 of the lower plate portion 51, the upper engagement portion 521 of the upper plate portion 52, and the inclined portion 61 form a substantially U-shaped folded portion at the rear end portion of the rectifying plate 50.

整流板５０が上記形状を備えることにより、排気ケーシング４０内には、整流板５０の下方で、下板部５１の傾斜に沿って後方へ移動した後、整流板５０の後部の折り返し部に沿って上方へ回り込んで前方へＵターンし、上板部５２の上方で前方へ移動して開口４００に達する排気通路が形成される（図２中二点鎖線が示す燃焼排気の流れ参照）。 Since the flow straightening plate 50 has the above-described shape, the flow straightening plate 50 moves rearward in the exhaust casing 40 below the flow straightening plate 50 along the inclination of the lower plate portion 51, and then along the folded portion of the rear portion of the flow straightening plate 50. And makes a U-turn forward, and moves forward above the upper plate portion 52 to reach the opening 400 (see the flow of combustion exhaust indicated by the two-dot chain line in FIG. 2).

雨除け部８０は、前側傾斜部６４の上面に固定される。雨除け部８０は、平面視左右方向に長い略矩形状に形成され、排気筒９から排気ケーシング４０内の整流板５０に向かって勢いよく入射する雨水を受ける。雨除け部８０に当たって後方に跳ね返った雨水は、排気ケーシング４０の緩傾斜部４４の下面に衝突するようになっている。緩傾斜部４４の下面に衝突した雨水は、整流板５０の前側傾斜部６４上に落下する。これにより、排気ケーシング４０内において、雨水が整流板５０の後部を超えて、筐体２内に侵入するのを防止できる。 The rain shield 80 is fixed to the upper surface of the front sloped portion 64. The rain shield 80 is formed in a substantially rectangular shape that is long in the left-right direction in plan view, and receives the rainwater that is vigorously incident from the exhaust pipe 9 toward the flow straightening plate 50 in the exhaust casing 40. The rainwater that hits the rain shield 80 and bounces backwards collides with the lower surface of the gently inclined portion 44 of the exhaust casing 40. The rainwater that collides with the lower surface of the gently inclined portion 44 falls on the front inclined portion 64 of the straightening vane 50. Thereby, in the exhaust casing 40, it is possible to prevent rainwater from entering the housing 2 beyond the rear portion of the rectifying plate 50.

雨除け部８０は、受板８１、右支持部８２、左支持部８３を備える。受板８１は、平面視左右方向に延びる略矩形状に形成され、排気筒９を介して排気ケーシング４０内に入射する雨水を受ける。右支持部８２は、受板８１の右端部から垂下し、その下端側が右方に折り返された正面視略Ｌ字状に形成される。左支持部８３は、受板８１の左端部から垂下し、その下端側が左方に折り返された正面視略逆Ｌ字状に形成される。右支持部８２と左支持部８３の夫々の下端側は、前側傾斜部６４の上面に固定（例えばスポット溶接等）される。これにより、受板８１は、前側傾斜部６４の上面から所定の高さ位置（後述する高さＨ）に、前側傾斜部６４の上面に対して平行に支持される。なお、雨除け部８０の固定位置と、受板８１の高さＨについては、後述する。 The rain shield 80 includes a receiving plate 81, a right supporting portion 82, and a left supporting portion 83. The receiving plate 81 is formed in a substantially rectangular shape extending in the left-right direction in a plan view, and receives rainwater entering the exhaust casing 40 via the exhaust pipe 9. The right support portion 82 hangs down from the right end portion of the receiving plate 81, and the lower end side thereof is formed in a substantially L-shape when viewed from the front and folded back to the right. The left support portion 83 hangs down from the left end portion of the receiving plate 81, and the lower end side thereof is formed in a generally inverted L-shape when viewed from the front and folded back to the left. The lower end sides of the right support portion 82 and the left support portion 83 are fixed to the upper surface of the front side inclined portion 64 (for example, spot welding). As a result, the receiving plate 81 is supported in parallel with the upper surface of the front inclined portion 64 at a predetermined height position (height H described later) from the upper surface of the front inclined portion 64. The fixed position of the rain shield 80 and the height H of the receiving plate 81 will be described later.

図２を参照し、排気筒９の構造を説明する。排気筒９は、前後方向に延びる略四角筒状に形成される。排気筒９の前端部には、内側に向けて屈曲されたバーリング部９１が設けられる。そのバーリング部９１の内側に、排気出口９２が設けられる。排気出口９２は、正面視左右方向に長い略矩形状に形成される。排気筒９の後端部には、外方に向けてフランジ状に突出するフランジ部９３が設けられる。フランジ部９３は正面視略矩形リング状に形成される。フランジ部９３の外周部には、内側に折り返された加締め片９４が設けられる。 The structure of the exhaust stack 9 will be described with reference to FIG. The exhaust pipe 9 is formed in a substantially rectangular tube shape extending in the front-rear direction. A burring portion 91 that is bent inward is provided at the front end of the exhaust pipe 9. An exhaust outlet 92 is provided inside the burring portion 91. The exhaust outlet 92 is formed in a substantially rectangular shape that is long in the left-right direction when viewed from the front. A flange portion 93 that protrudes outward in a flange shape is provided at a rear end portion of the exhaust pipe 9. The flange portion 93 is formed in a generally rectangular ring shape in a front view. A crimping piece 94 folded back inward is provided on the outer peripheral portion of the flange portion 93.

フランジ部９３の後面に対して、排気ケーシング４０の前端部に設けられた取付フランジ部４６と、整流板５０の下板部５１の前端部に設けられた取付片５１２が配置され、加締め片９４で加締められる。これにより、排気ケーシング４０の前端部と、整流板５０の下板部５１の前端部に対し、排気筒９が固定される。排気ケーシング４０の開口４００の前方に、排気筒９の排気出口９２が配置される。これにより、排気筒９は、排気ケーシング４０の開口４００から流れる燃焼排気を排気出口９２から良好に排出できる。整流板５０の下板部５１の前端部は、排気ケーシング４０の開口４００を介して、排気筒９の排気出口９２の下縁部付近まで延びる。 On the rear surface of the flange portion 93, the mounting flange portion 46 provided at the front end portion of the exhaust casing 40 and the mounting piece 512 provided at the front end portion of the lower plate portion 51 of the rectifying plate 50 are arranged. It is crimped at 94. As a result, the exhaust pipe 9 is fixed to the front end of the exhaust casing 40 and the front end of the lower plate portion 51 of the straightening plate 50. The exhaust outlet 92 of the exhaust pipe 9 is arranged in front of the opening 400 of the exhaust casing 40. As a result, the exhaust stack 9 can satisfactorily discharge the combustion exhaust flowing from the opening 400 of the exhaust casing 40 from the exhaust outlet 92. The front end portion of the lower plate portion 51 of the current plate 50 extends to the vicinity of the lower edge portion of the exhaust outlet 92 of the exhaust pipe 9 through the opening 400 of the exhaust casing 40.

上記構造を有する排気筒９は、フロントカバー８の上部に設けられた筒用固定穴（図示略）に対して背面側から挿入され、フロントカバー８の背面に固定される。これにより、排気筒９がフロントカバー８の上部において前方に突出する状態で固定される。 The exhaust pipe 9 having the above structure is inserted from the rear side into a cylinder fixing hole (not shown) provided in the upper portion of the front cover 8 and fixed to the rear face of the front cover 8. As a result, the exhaust pipe 9 is fixed at the upper portion of the front cover 8 so as to project forward.

図４〜図６を参照し、雨除け部８０の固定位置と高さ位置を説明する。説明の便宜上、図４、図５では、雨除け部８０を省略する。図４、図５中二点鎖線で示すＡ１〜Ａ５は、整流板５０の上板部５２の上面に対する入射角度を大きい方から小さい方に変化させたときの雨水の経路を示す。図４では、雨水Ａ１、Ａ２の経路、図５では、雨水Ａ３〜Ａ５の経路を示す。雨水は無風のとき、垂直に落下するが、風（空気の流れ）等の影響により、その落下する角度は変化する。落下する角度によって、雨水は、排気筒９の排気出口９２から排気ケーシング４０内に降り込む場合がある。雨水が排気ケーシング４０内に降り込んだ場合、整流板５０の上板部５２（前側傾斜部６４又は後側傾斜部６３）の上面に当たって後方に跳ね返る。雨水の跳ね返る方向は、前側傾斜部６４の上面に対する雨水の入射角度によって変化する。 The fixed position and the height position of the rain shield 80 will be described with reference to FIGS. 4 to 6. For convenience of explanation, the rain shield 80 is omitted in FIGS. 4 and 5. In FIGS. 4 and 5, A1 to A5 indicated by two-dot chain lines indicate paths of rainwater when the incident angle with respect to the upper surface of the upper plate portion 52 of the rectifying plate 50 is changed from a larger one to a smaller one. FIG. 4 shows the routes of rainwater A1 and A2, and FIG. 5 shows the routes of rainwater A3 to A5. Rainwater falls vertically when there is no wind, but the angle of the rainwater changes due to the influence of wind (air flow). Depending on the angle of fall, rainwater may fall into the exhaust casing 40 from the exhaust outlet 92 of the exhaust stack 9. When the rainwater falls into the exhaust casing 40, the rainwater hits the upper surface of the upper plate portion 52 (the front side inclined portion 64 or the rear side inclined portion 63) of the straightening plate 50 and bounces backward. The direction in which the rainwater bounces changes depending on the angle of incidence of the rainwater on the upper surface of the front sloped portion 64.

図４に示すように、雨水Ａ１、Ａ２は入射角度が比較的大きいので、整流板５０の前側傾斜部６４の上面の前側に当たって斜め上方に跳ね返った後、排気ケーシング４０の緩傾斜部４４の下面に衝突する。緩傾斜部４４の下面に衝突した雨水は、緩傾斜部４４を伝って排気出口９２側に流れるか、前側傾斜部６４の上面に落下して排気出口９２側に流れる。従って、雨水Ａ１、Ａ２においては、前側傾斜部６４の上面に当たって跳ね返っても、排気ケーシング４０の奥側に入り込むことはない。 As shown in FIG. 4, since the incident angles of the rainwater A1 and A2 are relatively large, the rainwater A1 and A2 hit the front side of the upper surface of the front sloped portion 64 of the straightening plate 50 and bounce obliquely upward, and then the lower surface of the gently sloped portion 44 of the exhaust casing 40. Clash with. The rainwater that has collided with the lower surface of the gentle slope 44 flows along the gentle slope 44 toward the exhaust outlet 92 side, or falls on the upper surface of the front slope 64 and flows toward the exhaust outlet 92 side. Therefore, the rainwater A1 and A2 do not enter the inner side of the exhaust casing 40 even if the rainwater A1 and A2 hit the upper surface of the front inclined portion 64 and bounce off.

ところが、図５に示すように、雨水Ａ３、Ａ４は、排気出口９２に対して浅い角度で入射し、雨水Ａ１、Ａ２に比べて入射角度が小さいので、整流板５０の前側傾斜部６４の上面の中央よりも後端側に当たる。雨水Ａ３は、前側傾斜部６４の上面の中央に当たって斜め上方に跳ね返った後、緩傾斜部４４には衝突せず、最上部４２の下面に衝突する。最上部４２の下面に衝突した雨水の一部は、最上部４２と湾曲部４１を伝って後方に流れ落ちたり、整流板５０の水平部６２の上面に落下する場合がある。水平部６２の上面に落下した雨水の一部は、傾斜部６１を伝って後方に流れ落ちる場合がある。 However, as shown in FIG. 5, since the rainwater A3, A4 enters the exhaust outlet 92 at a shallow angle and has a smaller incident angle than the rainwater A1, A2, the upper surface of the front sloped portion 64 of the straightening plate 50. It hits the rear end side rather than the center. The rainwater A3 hits the center of the upper surface of the front side inclined portion 64 and bounces obliquely upward, and thereafter does not collide with the gentle inclined portion 44, but collides with the lower surface of the uppermost portion 42. Part of the rainwater that has collided with the lower surface of the uppermost portion 42 may flow backward along the uppermost portion 42 and the curved portion 41, or may drop onto the upper surface of the horizontal portion 62 of the straightening vane 50. A part of the rainwater that has dropped onto the upper surface of the horizontal portion 62 may flow backward along the inclined portion 61.

雨水Ａ４は、雨水Ａ３よりもさらに入射角度が小さい。それ故、前側傾斜部６４の上面の後側に当たって斜め上方に跳ね返った後は、整流板５０における水平部６２と傾斜部６１が接続する角部Ｃ上を通過し、最上部４２の下面のうち後側に衝突する。最上部４２の下面に衝突した雨水は、最上部４２と湾曲部４１を伝って後方に流れ落ちたり、整流板５０の傾斜部６１の上面に落下する場合がある。傾斜部６１の上面に落下した雨水は、そのまま後方に流れ落ちる場合がある。 The incident angle of the rainwater A4 is smaller than that of the rainwater A3. Therefore, after hitting the rear side of the upper surface of the front side inclined portion 64 and rebounding obliquely upward, it passes over the corner portion C where the horizontal portion 62 and the inclined portion 61 of the straightening vane 50 are connected, and among the lower surface of the uppermost portion 42. Crash on the rear side. The rainwater that collides with the lower surface of the uppermost portion 42 may flow rearward along the uppermost portion 42 and the curved portion 41, or may drop onto the upper surface of the inclined portion 61 of the current plate 50. Rainwater that has fallen onto the upper surface of the inclined portion 61 may flow backward as it is.

雨水Ａ５は、排気出口９２に対してほぼ水平に吹き込む雨水であって、例えば台風や竜巻等の暴風の場合に想定される。雨水Ａ５は、雨水Ａ４よりもさらに入射角度が小さい。それ故、雨水Ａ５は、整流板５０の前側傾斜部６４の上方を通過し、後側傾斜部６３の上面に当たる。後側傾斜部６３は、前側傾斜部６４よりも急な角度で傾斜するので、後側傾斜部６３に当たった雨水Ａ５は上方に跳ね返り、排気ケーシング４０の急傾斜部４３の下面に衝突する。急傾斜部４３の下面に衝突した雨水は、そのまま急傾斜部４３と緩傾斜部４４を伝って排気出口９２側に流れるか、後側傾斜部６３の上面に落下して排気出口９２側に流れる。従って、雨水Ａ５においては、雨水Ａ１、Ａ２と同様に、排気ケーシング４０の奥側に入り込むことはない。 The rainwater A5 is rainwater that is blown substantially horizontally to the exhaust outlet 92, and is assumed in the case of a typhoon, a tornado, or other storm. The incident angle of the rainwater A5 is smaller than that of the rainwater A4. Therefore, the rainwater A5 passes above the front sloped portion 64 of the straightening vane 50 and hits the upper surface of the rear sloped portion 63. Since the rear inclined portion 63 is inclined at a steeper angle than the front inclined portion 64, the rainwater A5 hitting the rear inclined portion 63 bounces upward and collides with the lower surface of the steep inclined portion 43 of the exhaust casing 40. The rainwater that collides with the lower surface of the steep slope portion 43 flows along the steep slope portion 43 and the gentle slope portion 44 as it is to the exhaust outlet 92 side, or falls on the upper surface of the rear slope portion 63 and flows to the exhaust outlet 92 side. .. Therefore, the rainwater A5, like the rainwater A1 and A2, does not enter the back side of the exhaust casing 40.

なお、雨水Ａ１〜Ａ４は、排気出口９２の上縁部付近を通過して、整流板５０の上板部５２の上面に入射する雨水の例である。これに対し、排気出口９２の上縁部よりも下方を通過して、上板部５２の上面に雨水Ａ１〜Ａ４と同一角度で入射する雨水の場合、その経路は、雨水Ａ１〜Ａ４の経路を下方に平行移動したものとなる。従って、上板部５２の上面における雨水の入射位置は、上縁部付近を通過して入射する雨水の入射位置よりも前側に位置する。よって、上板部５２の上面に当たって跳ね返った後に、排気ケーシング４０に衝突する位置も前側に位置する。つまり、上縁部付近を通過して入射する雨水において、排気ケーシング４０に衝突する位置が緩傾斜部４４であれば、上縁部よりも下方を通過して入射する雨水においても緩傾斜部４４に衝突する。よって、本実施形態では、排気出口９２の上縁部付近を通過する雨水の経路で、上板部５２の上面に当たって跳ね返った後の排気ケーシング４０に衝突する位置を確認する。 The rainwater A<b>1 to A<b>4 are examples of rainwater that passes through the vicinity of the upper edge portion of the exhaust outlet 92 and is incident on the upper surface of the upper plate portion 52 of the rectifying plate 50. On the other hand, in the case of rainwater that passes below the upper edge of the exhaust outlet 92 and is incident on the upper surface of the upper plate portion 52 at the same angle as the rainwater A1 to A4, the route is the route of the rainwater A1 to A4. Is translated downwards. Therefore, the incident position of the rainwater on the upper surface of the upper plate portion 52 is located on the front side of the incident position of the rainwater which passes through the vicinity of the upper edge and is incident. Therefore, after hitting the upper surface of the upper plate portion 52 and bouncing back, the position where it collides with the exhaust casing 40 is also located on the front side. That is, in the rainwater that passes through the vicinity of the upper edge portion and is incident, if the position where it collides with the exhaust casing 40 is the gentle slope portion 44, even in the rainwater that passes below the upper edge portion and is incident, the gentle slope portion 44. Clash with. Therefore, in the present embodiment, the position of the rainwater that passes through the vicinity of the upper edge of the exhaust outlet 92 and collides with the exhaust casing 40 after hitting the upper surface of the upper plate 52 and bouncing back is confirmed.

このように、雨水Ａ１〜Ａ５のうち、入射角度の小さい雨水Ａ３とＡ４においては、整流板５０の前側傾斜部６４の上面に当たって跳ね返った後、緩傾斜部４４及び急傾斜部４３の何れにも衝突しないので、排気ケーシング４０の奥側に入り込み、筐体２の内部に流れ落ちる可能性がある。入射角度の小さい雨水Ａ３、Ａ４について、前側傾斜部６４の上面に入射して跳ね返った後、排気ケーシング４０の緩傾斜部４４又は急傾斜部４３に衝突させるには、前側傾斜部６４の上面に入射する雨水の入射位置を前方に移動させ、排気ケーシング４０に衝突する衝突位置を前方に移動させればよい。そこで、本実施形態では、図２に示すように、整流板５０の前側傾斜部６４の上面に雨除け部８０を固定し、前側傾斜部６４の上面の入射位置よりも高い位置で雨水を受ける。これによって、排気ケーシング４０に対する衝突位置を前方に移動させることができる。 As described above, among the rainwaters A1 to A5, the rainwaters A3 and A4 having small incident angles hit the upper surface of the front sloped portion 64 of the straightening plate 50 and bounce back, and then fall on both the gentle sloped portion 44 and the steep sloped portion 43. Since there is no collision, there is a possibility that it will enter the back side of the exhaust casing 40 and fall into the inside of the housing 2. The rainwater A3, A4 having a small incident angle is incident on the upper surface of the front sloped portion 64, bounces back, and then collides with the gentle sloped portion 44 or the steep sloped portion 43 of the exhaust casing 40. The incident position of the incident rainwater may be moved forward, and the collision position of collision with the exhaust casing 40 may be moved forward. Therefore, in the present embodiment, as shown in FIG. 2, the rain shield 80 is fixed to the upper surface of the front sloped portion 64 of the current plate 50, and rainwater is received at a position higher than the incident position on the upper surface of the front sloped portion 64. .. As a result, the collision position with respect to the exhaust casing 40 can be moved forward.

上記の通り、雨水Ａ４は、前側傾斜部６４の上面の後側に当たって斜め上方に跳ね返った後、整流板５０の角部Ｃ上を通過し、排気ケーシング４０の最上部４２の下面に衝突する。雨水の入射角度をＡ４より小さくすると、前側傾斜部６４の上面に当たって跳ね返った雨水は、整流板５０の後側傾斜部６３の上面に衝突する。後側傾斜部６３は、前側傾斜部６４よりも急な角度で傾斜するので、後側傾斜部６３に衝突した雨水は、後側傾斜部６３に沿って前方に流れるか、上方に跳ね返った後に、排気ケーシング４０の急傾斜部４３の下面に当たって前方に流れるので、排気ケーシング４０の奥側に入り込まない。 As described above, the rainwater A4 hits the rear side of the upper surface of the front sloped portion 64, bounces obliquely upward, passes over the corner portion C of the straightening vane 50, and collides with the lower surface of the uppermost portion 42 of the exhaust casing 40. When the incident angle of rainwater is smaller than A4, the rainwater that hits the upper surface of the front sloped portion 64 and bounces back collides with the upper surface of the rear sloped portion 63 of the straightening plate 50. Since the rear inclined portion 63 inclines at a steeper angle than the front inclined portion 64, the rainwater colliding with the rear inclined portion 63 flows forward along the rear inclined portion 63 or bounces upward. Since it hits the lower surface of the steeply inclined portion 43 of the exhaust casing 40 and flows forward, it does not enter the deep side of the exhaust casing 40.

一方、雨水の入射角度をＡ４より大きくすると、前側傾斜部６４の上面に対する入射位置は、雨水Ａ３、Ａ２、Ａ１のように前方に移動する（図４、図５参照）。そして、雨水Ａ３では、前側傾斜部６４の上面に当たって跳ね返った後、排気ケーシング４０の最上部４２の下面に衝突するが、雨水Ａ２では、緩傾斜部４４の下面に衝突する。このことから、前側傾斜部６４の上面において、例えば、雨水Ａ２の入射位置から少なくとも雨水Ａ４の入射位置までの範囲において、前側傾斜部６４の上面よりも高い位置で雨水を跳ね返せば、排気ケーシング４０の緩傾斜部４４の下面に衝突させることができる。 On the other hand, when the incident angle of rainwater is larger than A4, the incident position on the upper surface of the front sloped portion 64 moves forward like rainwater A3, A2, and A1 (see FIGS. 4 and 5). Then, the rainwater A3 hits the upper surface of the front side inclined portion 64 and bounces and then collides with the lower surface of the uppermost portion 42 of the exhaust casing 40, whereas the rainwater A2 collides with the lower surface of the gently inclined portion 44. From this, on the upper surface of the front sloped portion 64, for example, in the range from the incident position of the rainwater A2 to at least the incident position of the rainwater A4, if the rainwater is repelled at a position higher than the upper surface of the front sloped portion 64, the exhaust casing It can be made to collide with the lower surface of the gently sloping portion 44 of 40.

そこで、図６に示すように、本実施形態では、排気筒９の排気出口９２の上縁部から整流板５０の上板部５２の上面に延ばした仮想線を、排気出口９２を介して外部から雨が入射する仮想入射線Ｐとし、当該仮想入射線Ｐと上板部５２の前側傾斜部６４の上面との仮想交点を、反射点Ｑ１とし、該反射点Ｑ１において仮想入射線Ｐと同一角度で反射する仮想線を、雨が反射する仮想反射線Ｒ１とする。そして、仮想入射線Ｐの入射角度を大きい方から小さい方に変化させたときに、仮想反射線Ｒ１が上板部５２の角部Ｃと最初に接するときの上板部５２における仮想交点Ｑ１を基準点Ｑ１とする。なお、角部Ｃは、水平部６２と後側傾斜部６３における頂点に相当する。このときの仮想入射線Ｐと仮想反射線Ｒ１で形成される経路は、雨水Ａ４の経路と一致する。 Therefore, as shown in FIG. 6, in the present embodiment, an imaginary line extending from the upper edge portion of the exhaust outlet 92 of the exhaust pipe 9 to the upper surface of the upper plate portion 52 of the flow straightening plate 50 is connected to the outside via the exhaust outlet 92. Is set as a virtual incident line P on which rain is incident, and a virtual intersection point between the virtual incident line P and the upper surface of the front side inclined portion 64 of the upper plate portion 52 is set as a reflection point Q1 and is the same as the virtual incident line P at the reflection point Q1. The virtual line that reflects at an angle is defined as a virtual reflection line R1 that reflects rain. Then, when the incident angle of the virtual incident line P is changed from the larger one to the smaller one, the virtual intersection point Q1 in the upper plate portion 52 when the virtual reflection line R1 first contacts the corner C of the upper plate portion 52 is The reference point is Q1. The corner portion C corresponds to the apex of the horizontal portion 62 and the rear inclined portion 63. The path formed by the virtual incident line P and the virtual reflection line R1 at this time matches the path of the rainwater A4.

そして、整流板５０の前側傾斜部６４の上面において、少なくともこの基準点Ｑ１の上方を覆うようにして、雨除け部８０が固定される。受板８１は、前側傾斜部６４の上面に対して平行になるように支持される。この構成により、排気出口９２を介して外部から入射する仮想入射線Ｐは、受板８１上の仮想交点Ｑ２で反射する。つまり、雨水Ａ４は、雨除け部８０が無い場合よりも排気出口９２側で、且つ上板部５２よりも上方の位置で反射する。反射点Ｑ２において仮想入射線Ｐと同一角度で反射する仮想線は、仮想反射線Ｒ２である。反射点がＱ１からＱ２に移動したことに伴い、仮想反射線もＲ１からＲ２に平行移動する。仮想反射線Ｒ２は、排気ケーシング４０の緩傾斜部４４の下面に衝突する。つまり、雨水Ａ４は、雨除け部８０の受板８１上の反射点Ｑ２で反射し、仮想反射線Ｒ２の経路に沿って飛ぶことにより、排気ケーシング４０の緩傾斜部４４の下面に衝突する。 Then, the rain shield 80 is fixed on the upper surface of the front sloped portion 64 of the straightening vane 50 so as to cover at least the reference point Q1. The receiving plate 81 is supported so as to be parallel to the upper surface of the front sloped portion 64. With this configuration, the virtual incident line P incident from the outside through the exhaust outlet 92 is reflected at the virtual intersection Q2 on the receiving plate 81. That is, the rainwater A4 is reflected at a position closer to the exhaust outlet 92 than when the rain shield 80 is not provided and above the upper plate 52. The virtual line that reflects at the same angle as the virtual incident line P at the reflection point Q2 is the virtual reflection line R2. As the reflection point moves from Q1 to Q2, the virtual reflection line also moves in parallel from R1 to R2. The virtual reflection line R2 collides with the lower surface of the gently inclined portion 44 of the exhaust casing 40. That is, the rainwater A4 is reflected at the reflection point Q2 on the receiving plate 81 of the rain shield 80, and flies along the path of the virtual reflection line R2 to collide with the lower surface of the gently inclined portion 44 of the exhaust casing 40.

さらに、雨除け部８０の受板８１は、前側傾斜部６４の上面における雨水Ａ３の入射位置（図５参照）の上方も覆っているので、雨水Ａ４と同様に、受板８１の上面に当たって跳ね返った雨水Ａ３は、排気ケーシング４０の緩傾斜部４４の下面に衝突する。これにより、雨水Ａ３、Ａ４のように、排気筒９の排気出口９２を介して浅い角度で入射したとしても、排気部３０は、雨水Ａ３、Ａ４が整流板５０の後部を超えて、筐体２内に侵入するのを防止できる。 Furthermore, since the receiving plate 81 of the rain shield 80 also covers the upper surface of the front sloped portion 64 above the incident position of the rainwater A3 (see FIG. 5), it hits the upper surface of the receiving plate 81 and bounces off like the rainwater A4. The rainwater A3 collides with the lower surface of the gently inclined portion 44 of the exhaust casing 40. As a result, even if rainwater A3, A4 enters through the exhaust outlet 92 of the exhaust pipe 9 at a shallow angle, the exhaust unit 30 causes the rainwater A3, A4 to exceed the rear portion of the rectifying plate 50, and the casing. 2 can be prevented from entering.

なお、前側傾斜部６４の上面において、受板８１で覆う領域については、基準点Ｑ１を含め、前側傾斜部６４の上面に当たって跳ね返った後に、排気ケーシング４０の最上部４２に衝突してしまう雨水の前側傾斜部６４の上面に対する入射位置を少なくとも覆うようにするとよい。これにより、前側傾斜部６４の上面に当たって跳ね返った雨水を、緩傾斜部４４に確実に衝突させることができる。 Note that, on the upper surface of the front sloped portion 64, the area covered by the receiving plate 81 hits the upper surface of the front sloped portion 64 including the reference point Q1 and bounces back, and then rainwater that collides with the uppermost portion 42 of the exhaust casing 40. It is preferable to cover at least the incident position on the upper surface of the front sloped portion 64. Thereby, the rainwater that hits the upper surface of the front sloped portion 64 and bounces back can be reliably made to collide with the gently sloped portion 44.

また、上記の通り、基準点Ｑ１は、上板部５２のうち、前側傾斜部６４上に設定されるので、雨除け部８０は、前側傾斜部６４に固定される。これにより、上板部５２の後部で前方に折り返された燃焼排気は、後側傾斜部６３上を流れた後で、前側傾斜部６４上の雨除け部８０に到達する。つまり、燃焼排気が雨除け部８０に移動するまでの助走距離を長くできる。よって、雨除け部８０が燃焼排気の流れを妨げるのを抑制できるので、排気部３０は、燃焼排気を排気出口９２から円滑に排出できる。 Further, as described above, since the reference point Q1 is set on the front side inclined portion 64 of the upper plate portion 52, the rain shield 80 is fixed to the front side inclined portion 64. As a result, the combustion exhaust gas that has been folded back forward at the rear portion of the upper plate portion 52 reaches the rain shield portion 80 on the front side inclined portion 64 after flowing on the rear side inclined portion 63. In other words, the approach distance until the combustion exhaust gas moves to the rain shield 80 can be lengthened. Therefore, the rain shield 80 can be prevented from obstructing the flow of the combustion exhaust, so that the exhaust unit 30 can smoothly discharge the combustion exhaust from the exhaust outlet 92.

また、雨除け部８０の受板８１の高さＨは、仮想反射線Ｒ２が排気ケーシング４０の緩傾斜部４４の下面に確実に衝突するように設定するとよい。高さＨは、前側傾斜部６４の上面からの高さである。仮に高さＨが低過ぎる場合、前側傾斜部６４の上面と高さ位置がほぼ変わらず、緩傾斜部４４の下面に衝突しない可能性がある。緩傾斜部４４の下面に衝突できる高さＨを規定することで、受板８１上の反射点Ｑ２で反射させた雨水Ａ４を、緩傾斜部４４の下面に確実に衝突させることができる。 Further, the height H of the receiving plate 81 of the rain shield 80 may be set so that the virtual reflection line R2 surely collides with the lower surface of the gently sloped portion 44 of the exhaust casing 40. The height H is the height from the upper surface of the front sloped portion 64. If the height H is too low, the height position of the front sloped portion 64 is almost the same as that of the front sloped portion 64, and there is a possibility that the height H does not collide with the bottom surface of the gentle sloped portion 44. By defining the height H at which the lower surface of the gently sloped portion 44 can collide, the rainwater A4 reflected at the reflection point Q2 on the receiving plate 81 can surely collide with the lower surface of the gently sloped portion 44.

さらに、雨除け部８０は、受板８１が、前側傾斜部６４の上面と、該上面と対向する排気ケーシング４０の緩傾斜部４４の下面との高さ方向の中間部よりも下方に位置するように設けるのがよい。これにより、上板部５２の上方を通過する燃焼排気の流れを妨げるのを防止できるので、排気出口９２から燃焼排気を円滑に排出できる。 Further, in the rain shield 80, the receiving plate 81 is located below the intermediate portion in the height direction between the upper surface of the front side inclined portion 64 and the lower surface of the gently inclined portion 44 of the exhaust casing 40 facing the upper surface. It is recommended that Accordingly, it is possible to prevent the flow of the combustion exhaust passing above the upper plate portion 52 from being obstructed, so that the combustion exhaust can be smoothly discharged from the exhaust outlet 92.

なお、上記の通り、雨水Ａ５のように、排気出口９２に対してより浅い角度で入射し、雨除け部８０に当たらない雨水については、整流板５０の後側傾斜部６３に衝突するので、そのような雨水が筐体２内に侵入することもない。 As described above, rainwater A5, which is incident on the exhaust outlet 92 at a shallower angle and does not hit the rain shield 80, collides with the rear slope portion 63 of the rectifying plate 50. Such rainwater will not enter the housing 2.

以上説明したように、本実施形態の給湯器１は、排気ケーシング４０、排気筒９、整流板５０を備える。排気ケーシング４０は、バーナ１８１からの燃焼排気の熱によって通水を加熱する熱交換器１９の上方に設けられ、前部が熱交換器１９よりも前方へ張り出し、熱交換器１９を上方に通過した燃焼排気を排出する開口４００を前部に備える。排気筒９は、開口４００から前方に突出し、開口４００から排出された燃焼排気を、前端部に形成された排気出口９２から外部に排出する。整流板５０は、排気ケーシング４０内に支持され、熱交換器１９を上方に通過した燃焼排気を受けて開口４００に向けて整流する。整流板５０は、下板部５１と上板部５２を備える。下板部５１は、前側から後側になるにつれて斜め上方に傾斜する。上板部５２は、下板部５１の後部から前方に屈曲して折り返した後、前側になるにつれて下方に傾斜し、排気出口９２の下縁部に向けて延びる。 As described above, the water heater 1 of the present embodiment includes the exhaust casing 40, the exhaust pipe 9, and the straightening vane 50. The exhaust casing 40 is provided above the heat exchanger 19 that heats the water flow by the heat of the combustion exhaust gas from the burner 181, and the front portion projects forward from the heat exchanger 19 and passes through the heat exchanger 19 upward. An opening 400 for discharging the combustion exhaust gas is provided in the front portion. The exhaust pipe 9 projects forward from the opening 400, and discharges the combustion exhaust discharged from the opening 400 to the outside through an exhaust outlet 92 formed at the front end portion. The current plate 50 is supported in the exhaust casing 40, receives the combustion exhaust gas that has passed through the heat exchanger 19 upward, and rectifies the exhaust gas toward the opening 400. The current plate 50 includes a lower plate portion 51 and an upper plate portion 52. The lower plate portion 51 is inclined obliquely upward from the front side toward the rear side. The upper plate portion 52 is bent forward from the rear portion of the lower plate portion 51 and folded back, then inclines downward toward the front side and extends toward the lower edge portion of the exhaust outlet 92.

上記構成において、上板部５２の上面には、雨除け部８０が固定される。これにより、排気筒９の排気出口９２を介して浅い角度で雨水が排気ケーシング４０内に入射したとしても、その雨水は、雨除け部８０が無い場合よりも排気出口９２側で、且つ上板部５２よりも上方の位置で反射する。よって、雨水は、排気ケーシング４０の上部に衝突するので、整流板５０の後部を超えて筐体２内に侵入するのを防止できる。 In the above structure, the rain shield 80 is fixed to the upper surface of the upper plate 52. As a result, even if rainwater enters the exhaust casing 40 through the exhaust outlet 92 of the exhaust pipe 9 at a shallow angle, the rainwater is closer to the exhaust outlet 92 and to the upper plate than the case where the rain shield 80 is not provided. The light is reflected at a position above the portion 52. Therefore, the rainwater collides with the upper portion of the exhaust casing 40, so that it is possible to prevent the rainwater from entering the casing 2 beyond the rear portion of the rectifying plate 50.

なお、排気筒９の排気出口９２から上板部５２の上面に延ばした仮想線を、排気出口９２を介して外部から雨水が入射する仮想入射線Ｐとし、当該仮想入射線Ｐと上板部５２の上面との仮想交点で仮想入射線Ｐと同一角度で反射する仮想線を、雨水が反射する仮想反射線Ｒ１とし、仮想入射線Ｐの入射角度を大きい方から小さい方に変化させたときに、仮想反射線Ｒ１が上板部５２の上面と最初に接するときの上板部５２における仮想交点を基準点Ｑ１とした場合、雨除け部８０は、少なくともその基準点Ｑ１の上方を覆うようにして設けられるのがよい。 A virtual line extending from the exhaust outlet 92 of the exhaust pipe 9 to the upper surface of the upper plate portion 52 is set as a virtual incident line P through which rainwater is incident from the outside through the exhaust outlet 92, and the virtual incident line P and the upper plate portion. When the virtual line that reflects at the same angle as the virtual incident line P at the virtual intersection with the upper surface of 52 is the virtual reflection line R1 that reflects the rainwater, and the incident angle of the virtual incident line P is changed from the larger one to the smaller one. When the virtual intersection point in the upper plate portion 52 when the virtual reflection line R1 first contacts the upper surface of the upper plate portion 52 is set as the reference point Q1, the rain shield 80 covers at least the upper side of the reference point Q1. It is good to be provided.

上記説明において、排気ケーシング４０の湾曲部４１と最上部４２は、本発明の「後方湾曲部」の一例であり、急傾斜部４３と緩傾斜部４４は、本発明の「傾斜部」の一例である。整流板５０の上板部５２の後側傾斜部６３は、本発明の「第一傾斜部」の一例であり、前側傾斜部６４は、本発明の「第二傾斜部」の一例である。 In the above description, the curved portion 41 and the uppermost portion 42 of the exhaust casing 40 are examples of the “rear curved portion” of the present invention, and the steeply inclined portion 43 and the gently inclined portion 44 are examples of the “inclined portion” of the present invention. Is. The rear inclined portion 63 of the upper plate portion 52 of the current plate 50 is an example of the “first inclined portion” in the present invention, and the front inclined portion 64 is an example of the “second inclined portion” in 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。本実施形態の排気ケーシング４０は、傾斜角度が異なる急傾斜部４３と緩傾斜部４４を備え、二段階で傾斜するが、一つの傾斜部であってもよい。 The present invention is not limited to the above embodiment, and various modifications can be made. The exhaust casing 40 of the present embodiment includes the steep slope portion 43 and the gentle slope portion 44 having different inclination angles and is inclined in two steps, but may be one inclination portion.

整流板５０は、下板部５１と上板部５２の二部材で構成するが、一枚の板金を折り曲げて形成してもよい。上板部５２は、傾斜角度が異なる後側傾斜部６３と前側傾斜部６４を備えることで、二段階で傾斜するが、さらに多段階で傾斜していてもよく、一つの傾斜部であってもよい。また、傾斜部は、直線的に傾斜する以外に、例えば曲線的に傾斜していてもよい。また、排気ケーシング４０内における整流板５０の支持構造は、上記実施形態に限定されない。 The current plate 50 is composed of two members, a lower plate portion 51 and an upper plate portion 52, but may be formed by bending a single sheet metal. The upper plate portion 52 is inclined in two steps by including the rear side inclined portion 63 and the front side inclined portion 64 having different inclination angles, but may be inclined in multiple steps, and is one inclined portion. Good. Further, the inclined portion may be, for example, curved in addition to being linearly inclined. Further, the structure for supporting the flow regulating plate 50 in the exhaust casing 40 is not limited to the above embodiment.

雨除け部８０は、受板８１を右支持部８２と左支持部８３で支持する構造であるが、これ以外の構造でもよく、例えば、所定の厚み（例えば、高さＨと同一厚み）を有する受板を整流板５０の上板部５２上に直接固定してもよい。 The rain shield 80 has a structure in which the receiving plate 81 is supported by the right supporting portion 82 and the left supporting portion 83, but may have a structure other than this, for example, a predetermined thickness (for example, the same thickness as the height H). The receiving plate may be directly fixed to the upper plate portion 52 of the straightening plate 50.

雨除け部８０は、排気出口９２を介して入射した雨水を受け、排気ケーシング４０の緩傾斜部４４に衝突させるが、雨除け部８０を固定する位置によっては、急傾斜部４３に衝突させてもよい。 The rain shield 80 receives the rainwater incident through the exhaust outlet 92 and collides it with the gentle slope 44 of the exhaust casing 40. However, depending on the position where the rain shield 80 is fixed, the rain shield 80 may collide with the steep slope 43. Good.

上記実施形態の排気部３０は、整流板５０の上板部５２の上面に向けて入射する雨水を、雨除け部８０の受板８１で受けることによって、排気ケーシング４０の緩傾斜部４４の下面に衝突させ、排気出口９２側により確実に流すものであるが、整流板５０の上板部５２の上面に当たって跳ね返った雨水が、排気ケーシング４０の最上部４２の後端側に衝突しなければよい。よって、雨除け部８０の受板８１で受けることによって、排気ケーシング４０の最上部４２の前端側に衝突させても本願の効果は得られる。 The exhaust part 30 of the above-described embodiment receives rainwater incident on the upper surface of the upper plate part 52 of the rectifying plate 50 by the receiving plate 81 of the rain shield part 80, so that the lower surface of the gently sloping part 44 of the exhaust casing 40. However, the rainwater that hits the upper surface of the upper plate portion 52 of the straightening plate 50 and bounces off does not collide with the rear end side of the uppermost portion 42 of the exhaust casing 40. .. Therefore, the effect of the present invention can be obtained even if the receiving plate 81 of the rain shield 80 collides with the front end side of the uppermost portion 42 of the exhaust casing 40.

排気筒９の前端部に設けられたバーリング部９１は省略してもよい。 The burring portion 91 provided at the front end of the exhaust pipe 9 may be omitted.

１給湯器
９排気筒
１９熱交換器
４０排気ケーシング
４１湾曲部
４２最上部
４３急傾斜部
４４緩傾斜部
５０整流板
５１下板部
５２上板部
６３後側傾斜部
６４前側傾斜部
８０雨除け部
９２排気出口
１８１バーナ
４００開口
Ｐ１仮想入射線
Ｑ１基準点
Ｒ１仮想反射線 1 Hot Water Heater 9 Exhaust Cylinder 19 Heat Exchanger 40 Exhaust Casing 41 Curved Part 42 Top 43 43 Steep Slope 44 Slow Slope 50 Straightening Plate 51 Lower Plate 52 Upper Plate 63 Rear Slope 64 Front Slope 80 Rain Sink Part 92 Exhaust outlet 181 Burner 400 Opening P1 Virtual incident line Q1 Reference point R1 Virtual reflection line

Claims

The combustion exhaust is provided above the heat exchanger that heats the water flow by the heat of the combustion exhaust from the burner, and the front portion projects forward from the heat exchanger and discharges the combustion exhaust passing through the heat exchanger upward. An exhaust casing having an opening at the front,
An exhaust pipe that projects forward from the opening and discharges the combustion exhaust discharged from the opening to the outside from an exhaust outlet formed at a front end portion,
A water heater provided in the exhaust casing, comprising: a rectifying plate that receives the combustion exhaust gas that has passed through the heat exchanger upward and rectifies the rectified gas toward the opening,
The current plate is
A lower plate portion that inclines obliquely upward from the front side to the rear side,
After being bent forward from the rear portion of the lower plate portion and then folded back, the lower plate portion is inclined downward toward the front side and includes an upper plate portion that extends toward the lower edge portion of the exhaust outlet,
The water heater, wherein the upper surface of the upper plate part is provided with a rain shield part above the upper surface for receiving rainwater incident from the outside through the exhaust outlet.

A virtual line extending from the exhaust outlet of the exhaust stack to the upper surface of the upper plate portion is a virtual incident line from which the rainwater is incident from the outside through the exhaust outlet, and the virtual incident line and the upper plate portion A virtual line that is reflected at the same angle as the virtual incident line at the virtual intersection with the upper surface is a virtual reflection line that the rainwater reflects, and when the incident angle of the virtual incident line is changed from a larger one to a smaller one, When the virtual reflection line is the upper surface of the upper plate portion, and when the virtual intersection point in the upper plate portion when first contacting the portion excluding the virtual intersection point is a reference point,
The water heater according to claim 1, wherein the rain shield part is provided so as to cover at least an upper side of the reference point.

The exhaust casing is
A rear curved portion that rises upward in the rear portion and extends by curving forward,
An inclined portion that inclines downward from the front portion of the rear curved portion toward the exhaust outlet,
The rain shield part is provided at a height position where the rainwater incident on and reflected from the upper surface of the rain cover part collides with the lower surface of the inclined part of the exhaust casing. Water heater.

The upper plate portion,
A first sloped portion that slopes down toward the front side at a steeper slope than the lower plate portion,
A second inclined portion extending downward from the front end portion of the first inclined portion at a gentler gradient than the first inclined portion, and extending toward the lower edge portion of the opening,
The water heater according to any one of claims 1 to 3, wherein the rain shield part is provided on the second inclined part.

The rain shelter is
The hot water supply according to claim 1, wherein the hot water supply is provided below an intermediate portion in a height direction between the upper surface of the upper plate portion and a lower surface of the exhaust casing that faces the upper surface. vessel.