JP6715032B2

JP6715032B2 - Bath water heater

Info

Publication number: JP6715032B2
Application number: JP2016034576A
Authority: JP
Inventors: 克宜宮地; 太陽小舘
Original assignee: 株式会社パロマ
Priority date: 2016-02-25
Filing date: 2016-02-25
Publication date: 2020-07-01
Anticipated expiration: 2036-02-25
Also published as: JP2017150762A

Description

本発明は、給湯加熱部と風呂加熱部とを備えた風呂給湯器に関する。 The present invention relates to a bath water heater including a hot water heating unit and a bath heating unit.

従来、浴槽の湯水を加熱する機能を備えた風呂給湯器が広く実用に供されている。この風呂給湯器は、器具内に形成した燃焼室内に、バーナと熱交換器とをそれぞれ設けると共に、燃焼室内を給湯加熱部と風呂加熱部とに仕切り、給湯加熱部の熱交換器に給水管と出湯管とを接続し、風呂加熱部の熱交換器に浴槽の戻り配管と往き配管とを接続したものが知られている。
また、熱交換器は、熱効率を高めるために、主に顕熱を回収する一次熱交換器（主熱交換器）と、主に潜熱を回収する二次熱交換器（副熱交換器）とで形成されることもある。風呂給湯器では、例えば特許文献１に開示されるように、二次熱交換器のケーシング内を給湯側領域と風呂側領域とに仕切り、給湯側領域に設けた給湯側二次熱交換器の伝熱管を給水管と給湯側一次熱交換器とに接続する一方、風呂側領域に設けた風呂側二次熱交換器の伝熱管を戻り配管と風呂側一次熱交換器とに接続している。バーナの燃焼排気は、ケーシングの背面から各領域内に進入し、伝熱管の隙間を流れてケーシング前面の排気口から排出される。 Conventionally, a bath water heater having a function of heating hot water in a bath has been widely put into practical use. In this bath water heater, a burner and a heat exchanger are provided in a combustion chamber formed in the appliance, and the combustion chamber is partitioned into a hot water heating unit and a bath heating unit, and a water pipe is connected to the heat exchanger of the hot water heating unit. It has been known that a hot water supply pipe and a hot water supply pipe are connected to each other and a return pipe and a forward pipe of the bathtub are connected to a heat exchanger of a bath heating unit.
In addition, the heat exchanger has a primary heat exchanger (main heat exchanger) that mainly recovers sensible heat and a secondary heat exchanger (sub heat exchanger) that mainly recovers latent heat in order to improve thermal efficiency. It may be formed by. In the bath water heater, for example, as disclosed in Patent Document 1, the casing of the secondary heat exchanger is partitioned into a hot water supply side region and a bath side region, and a hot water supply side secondary heat exchanger provided in the hot water supply side region is provided. The heat transfer pipe is connected to the water supply pipe and the hot water supply side primary heat exchanger, while the heat transfer pipe of the bath side secondary heat exchanger provided in the bath side area is connected to the return pipe and the bath side primary heat exchanger. .. Combustion exhaust gas from the burner enters each region from the back surface of the casing, flows through the gaps of the heat transfer tubes, and is discharged from the exhaust port on the front surface of the casing.

特開２０１３−７２５６９号公報JP, 2013-72569, A

風呂側二次熱交換器を採用した風呂給湯器では、風呂側バーナの燃焼中は給気ファンによる給気圧で風呂側二次熱交換器を通過した燃焼排気は排気口からスムーズに排出される。しかし、風呂側バーナの燃焼が終了して給気ファンからの給気圧がなくなると、風呂側二次熱交換器での熱交換により発生したドレンが、硝酸を含む蒸気となってケーシング内に滞留し、時間を掛けて排気口から排出される。このため、発生した蒸気が器具の表面に接触して結露しやすくなり、器具表面を腐食させるおそれがある。 In the bath water heater that uses the bath-side secondary heat exchanger, the combustion exhaust gas that has passed through the bath-side secondary heat exchanger is smoothly discharged from the exhaust port while the bath-side burner is burning due to the air pressure supplied by the air supply fan. .. However, when the burner on the bath side burns and the supply air pressure from the air supply fan disappears, the drainage generated by heat exchange in the secondary heat exchanger on the bath side becomes vapor containing nitric acid and accumulates in the casing. Then, it is discharged from the exhaust port over time. For this reason, the generated steam is likely to come into contact with the surface of the device to cause dew condensation, which may corrode the surface of the device.

そこで、本発明は、風呂側二次熱交換器を備えたものであっても、ドレン蒸気による器具表面の腐食を好適に抑制することができる風呂給湯器を提供することを目的としたものである。 Therefore, the present invention has an object to provide a bath water heater capable of suitably suppressing corrosion of the appliance surface due to drain vapor even if the bath water secondary heat exchanger is provided. is there.

上記目的を達成するために、請求項１に記載の発明は、給湯側バーナと、給湯側一次熱交換器と、給湯側二次熱交換器とを有する給湯加熱部と、
風呂側バーナと、風呂側一次熱交換器と、風呂側二次熱交換器とを有する風呂加熱部と、を備え、
給湯側二次熱交換器と風呂側二次熱交換器とがケーシングに収容され、当該ケーシングの前後何れか一方の壁には、給湯側一次熱交換器及び風呂側一次熱交換器を通過した燃焼ガスが流入する流入口が、他方の壁には、流入した燃焼ガスが排出される排気口がそれぞれ設けられて、ケーシング内には、給湯側二次熱交換器を通過する給湯側排気通路と、風呂側二次熱交換器を通過する風呂側排気通路とが仕切り形成されてなる風呂給湯器であって、
ケーシング内には、風呂側排気通路を通る燃焼ガスを、排気口が形成される壁の内面に接触させてから排気口に導く冷却流路が形成されている一方、
排気口が形成される壁の内面には、排気口の上側から流入口側に突出して排気口の内側空間を上下に仕切る左右方向の案内板が設けられていることを特徴とする。 In order to achieve the above object, the invention according to claim 1 is a hot water supply heating unit having a hot water supply side burner, a hot water supply side primary heat exchanger, and a hot water supply side secondary heat exchanger,
A bath-side burner, a bath-side primary heat exchanger, and a bath-heating unit having a bath-side secondary heat exchanger,
The hot-water supply side secondary heat exchanger and the bath-side secondary heat exchanger were housed in a casing, and the hot-water supply side primary heat exchanger and the bath-side primary heat exchanger passed through either the front or rear wall of the casing. An inlet for the combustion gas to flow in and an exhaust outlet for discharging the inflowing combustion gas are provided on the other wall, and a hot water supply side exhaust passage that passes through the hot water supply side secondary heat exchanger is provided in the casing. And a bath-side exhaust passage that passes through the bath-side secondary heat exchanger and is formed into a partition,
In the casing, while forming a cooling flow path, the combustion gas passing through the bath-side exhaust passage is brought into contact with the inner surface of the wall where the exhaust port is formed and then guided to the exhaust port ,
A horizontal guide plate is provided on the inner surface of the wall where the exhaust port is formed so as to project from the upper side of the exhaust port to the inflow side and partition the inner space of the exhaust port into upper and lower parts .

請求項１に記載の発明によれば、ケーシング内に、燃焼ガスが排気口側の壁の内面に接触する冷却流路を形成したことにより、風呂側バーナの燃焼終了後に滞留した燃焼ガスが冷却流路を通過することで、燃焼ガスの雰囲気温度が下がり、ケーシング内でのドレンの発生が促進される。よって、器具外部へ排気された際、器具表面での結露の発生を抑えることができ、風呂側二次熱交換器を備えたものであっても、ドレン蒸気による器具表面の腐食を好適に抑制することができる。
また、案内板によって冷却流路が簡単に形成できる。
According to the invention described in claim 1, since the cooling gas passage is formed in the casing so that the combustion gas comes into contact with the inner surface of the wall on the exhaust port side, the combustion gas accumulated after the combustion of the bath side burner is cooled. By passing through the flow path, the ambient temperature of the combustion gas is lowered, and the generation of drain inside the casing is promoted. Therefore, when exhausted to the outside of the equipment, it is possible to suppress the occurrence of dew condensation on the equipment surface, and even if the equipment is equipped with a secondary heat exchanger on the bath side, the corrosion of the equipment surface due to drain vapor is preferably suppressed. can do.
Further , the cooling flow path can be easily formed by the guide plate.

風呂給湯器の断面図である。It is sectional drawing of a bath water heater. 二次熱交換器の斜視図である。It is a perspective view of a secondary heat exchanger. 二次熱交換器における風呂側二次熱交換器部分の縦断面図である。It is a longitudinal cross-sectional view of the bath side secondary heat exchanger part in the secondary heat exchanger. 二次熱交換器における給湯側二次熱交換器部分の縦断面図である。It is a longitudinal cross-sectional view of the hot water supply side secondary heat exchanger part in the secondary heat exchanger. （Ａ）は、側壁及び風呂側二次熱交換器の伝熱管を省略したケーシングの前方からの斜視図、（Ｂ）はさらに上板を省略した斜視図である。(A) is a perspective view from the front of the casing in which a side wall and a heat transfer tube of the bath side secondary heat exchanger are omitted, and (B) is a perspective view in which an upper plate is further omitted. （Ａ）は、側壁及び風呂側二次熱交換器の伝熱管を省略したケーシングの後方からの斜視図、（Ｂ）はさらに上板を省略した斜視図である。(A) is a perspective view from the rear of the casing in which the side wall and the heat transfer tube of the bath side secondary heat exchanger are omitted, and (B) is a perspective view in which the upper plate is further omitted.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、風呂給湯器の一例を示す断面図である。この風呂給湯器１は、図示しない筐体内に燃焼装置２を備えてなり、燃焼装置２は、内部が連通する缶体３内に、下方から、バーナユニット４、一次熱交換器５、二次熱交換器６の順に設けて形成されている。
まず、バーナユニット４では、第１バーナ群７と第２バーナ群８とが左右方向に並設される。各バーナ群７，８は、上端面に炎孔を形成した扁平なバーナ９，９・・を複数左右方向に並べてなり、各バーナ９の下部に設けた混合管１０の後端に、ガス供給管に接続される図示しないノズルを臨ませて、ガスと共に燃焼用一次空気が供給されるようになっている。ここでは第１バーナ群７が給湯側バーナ、第２バーナ群８が風呂側バーナとなっており、能力の大きい第１バーナ群７のバーナ９の数を第２バーナ群８よりも多くしている。 Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a sectional view showing an example of a bath water heater. The bath water heater 1 is provided with a combustion device 2 in a housing (not shown), and the combustion device 2 is arranged in a can body 3 communicating with the inside thereof from below, a burner unit 4, a primary heat exchanger 5, and a secondary heat exchanger. The heat exchanger 6 is formed in this order.
First, in the burner unit 4, the first burner group 7 and the second burner group 8 are arranged side by side in the left-right direction. Each of the burner groups 7 and 8 is formed by arranging a plurality of flat burners 9 having a flame hole on the upper end surface side by side in the left-right direction, and supplies gas to the rear end of the mixing pipe 10 provided at the bottom of each burner 9. The primary air for combustion is supplied together with the gas by facing a nozzle (not shown) connected to the pipe. Here, the first burner group 7 is the hot water supply side burner and the second burner group 8 is the bath side burner. The number of burners 9 of the first burner group 7 having a large capacity is set to be larger than that of the second burner group 8. There is.

次に、一次熱交換器５では、第１バーナ群７の上方に位置する給湯側一次熱交換器１１と、第２バーナ群８の上方に位置する風呂側一次熱交換器１２とが左右方向に並設される。各熱交換器１１，１２は、前後方向に所定間隔をおいて複数枚積層したフィン１３，１３・・と、各フィン１３を蛇行状に貫通する伝熱管１４とからなる。
また、二次熱交換器６では、給湯側一次熱交換器１１の上方に位置し、螺旋状に巻回される複数の伝熱管１６．１６・・からなる給湯側二次熱交換器１５と、風呂側一次熱交換器１２の上方に位置し、螺旋状に巻回される複数の伝熱管１８，１８・・からなる風呂側二次熱交換器１７とが左右に並設される。この二次熱交換器１５，１７は、図２に示すように、前壁２０と、後壁２１と、上壁２２と、下壁２３と、左右の側壁２４，２４とからなる箱状のケーシング１９に収容されている。 Next, in the primary heat exchanger 5, the hot water supply side primary heat exchanger 11 located above the first burner group 7 and the bath side primary heat exchanger 12 located above the second burner group 8 are arranged in the left-right direction. Will be installed side by side. Each of the heat exchangers 11 and 12 is composed of a plurality of fins 13, 13... Stacked at predetermined intervals in the front-rear direction, and a heat transfer tube 14 penetrating each fin 13 in a meandering manner.
Further, in the secondary heat exchanger 6, there is a hot water supply side secondary heat exchanger 15 which is located above the hot water supply side primary heat exchanger 11 and is composed of a plurality of spirally wound heat transfer tubes 16.16. A bath-side secondary heat exchanger 17, which is located above the bath-side primary heat exchanger 12 and is composed of a plurality of spirally wound heat transfer tubes 18, 18,. As shown in FIG. 2, the secondary heat exchangers 15 and 17 have a box-like shape including a front wall 20, a rear wall 21, an upper wall 22, a lower wall 23, and left and right side walls 24 and 24. It is housed in the casing 19.

ケーシング１９の後壁２１には、図３，４に示すように、一次熱交換器５を通過した燃焼ガスの流入口２５が、前壁２０には、排気口２６がそれぞれ左右方向に形成されている。ここでのケーシング１９の前壁２０、後壁２１、上壁２２、下壁２３は、前壁２０における排気口２６の上側部分と上壁２２、後壁２１における流入口２５の上側部分とが一体となる上板１９Ａと、前壁２０における排気口２６を含む下側部分と下壁２３、後壁２１における流入口２５を含む下側部分とが一体となる下板１９Ｂとを組み付けることで形成される。
また、ケーシング１９の内部には、給湯側二次熱交換器１５と風呂側二次熱交換器１７との間を仕切る仕切板２７が前後方向に設けられて、ケーシング１９内に、流入口２５から流入した燃焼ガスが給湯側二次熱交換器１５の伝熱管１６，１６・・間を通過して排気口２６から排出する給湯側排気通路２８と、流入口２５から流入した燃焼ガスが風呂側二次熱交換器１７の伝熱管１８，１８・・間を通過して排気口２６から排出する風呂側排気通路２９とを形成している。 As shown in FIGS. 3 and 4, an inlet 25 for the combustion gas passing through the primary heat exchanger 5 is formed in the rear wall 21 of the casing 19, and an exhaust port 26 is formed in the front wall 20 in the left-right direction. ing. The front wall 20, the rear wall 21, the upper wall 22, and the lower wall 23 of the casing 19 are the upper portion of the exhaust port 26 of the front wall 20 and the upper portion of the upper wall 22 of the rear wall 21 of the inflow port 25. By assembling the integrated upper plate 19A, the lower plate 19B in which the lower portion of the front wall 20 including the exhaust port 26 and the lower wall 23 and the lower portion of the rear wall 21 including the inflow port 25 are integrated. It is formed.
Further, inside the casing 19, a partition plate 27 for partitioning the hot water supply side secondary heat exchanger 15 and the bath side secondary heat exchanger 17 is provided in the front-rear direction, and the inside of the casing 19 has an inlet 25. The combustion gas flowing in from the hot water supply side secondary heat exchanger 15 passes through the heat transfer pipes 16, 16... Between the hot water supply side exhaust passages 28 and the combustion gas flowing in from the inflow port 25 is discharged into the bath. A bath-side exhaust passage 29 is formed which passes between the heat transfer tubes 18, 18 of the side secondary heat exchanger 17 and is discharged from the exhaust port 26.

さらに、ケーシング１９の右側の側壁２４には、給湯側二次熱交換器１５の伝熱管１６の入口３０と出口３１とが設けられて、入口３０に給水管３２が接続され、出口３１には、給湯側一次熱交換器１１の伝熱管１４の入口への接続管３３が接続される。給湯側一次熱交換器１１の伝熱管１４の出口には、出湯管３４が接続される。
一方、ケーシング１９の左側の側壁２４には、風呂側二次熱交換器１７の伝熱管１８の入口３５と出口３６とが設けられて、入口３５に浴槽からの戻り配管３７が接続され、出口３６には、風呂側一次熱交換器１２の伝熱管１４の入口への図示しない接続管が接続される。風呂側一次熱交換器１２の伝熱管１４の出口には、浴槽への往き配管３８が接続されている。 Further, an inlet 30 and an outlet 31 of the heat transfer pipe 16 of the hot water supply side secondary heat exchanger 15 are provided on the right side wall 24 of the casing 19, a water supply pipe 32 is connected to the inlet 30, and an outlet 31 is provided at the outlet 31. A connection pipe 33 is connected to the inlet of the heat transfer pipe 14 of the hot water supply side primary heat exchanger 11. A hot water outlet pipe 34 is connected to the outlet of the heat transfer pipe 14 of the hot water supply side primary heat exchanger 11.
On the other hand, the left side wall 24 of the casing 19 is provided with an inlet 35 and an outlet 36 of the heat transfer tube 18 of the bath side secondary heat exchanger 17, and a return pipe 37 from the bathtub is connected to the inlet 35 and an outlet. A connection pipe (not shown) to the inlet of the heat transfer pipe 14 of the bath side primary heat exchanger 12 is connected to 36. An outlet pipe 38 to the bathtub is connected to the outlet of the heat transfer pipe 14 of the bath-side primary heat exchanger 12.

そして、ケーシング１９内で、上壁２２の下側には、前方へ向かって下り傾斜する天井板３９が設けられている。この天井板３９の前方には、前壁２０から所定間隔をおいた後方位置から前壁２０と平行に垂下し、ケーシング１９内の上下方向中央よりやや下側位置まで伸びる垂下部４１と、その垂下部４１の下端から前方斜め上へ伸びて排気口２６の上端に接続される案内板としての左右方向の案内部４２とからなる整流板４０が設けられている。仕切板２７は、整流板４０の垂下部４１に当接する位置まで形成されている。よって、流入口２５から給湯側排気通路２８及び風呂側排気通路２９を通過する燃焼ガスは、整流板４０の垂下部４１に当接すると、点線矢印で示すように、垂下部４１に沿って下降した後、垂下部４１の下方を回り込んで案内部４２に沿って前方へ移動し、排気口２６から排出されることになる。 Further, in the casing 19, below the upper wall 22, a ceiling plate 39 that is inclined downward toward the front is provided. In front of this ceiling plate 39, a hanging portion 41 that hangs from a rear position spaced apart from the front wall 20 in parallel with the front wall 20 and extends to a position slightly lower than the vertical center in the casing 19, A rectifying plate 40 is provided which includes a left and right guide portion 42 as a guide plate that extends obliquely upward and forward from the lower end of the hanging portion 41 and is connected to the upper end of the exhaust port 26. The partition plate 27 is formed to a position where it abuts on the hanging portion 41 of the flow straightening plate 40. Therefore, when the combustion gas passing from the inflow port 25 through the hot water supply side exhaust passage 28 and the bath side exhaust passage 29 comes into contact with the drooping part 41 of the flow straightening plate 40, the combustion gas descends along the drooping part 41 as indicated by the dotted arrow. After that, it goes around the lower part of the hanging part 41, moves forward along the guide part 42, and is discharged from the exhaust port 26.

但し、ケーシング１９内の風呂側排気通路２９において、整流板４０の垂下部４１には、図５，６に示すように、四角形状の開口４３が形成されて、風呂側排気通路２９と整流板４０の内側とを連通させている。よって、排気口２６の内側空間は、排気口２６の上側から後方へ突出する整流板４０の案内部４２によって上下に仕切られる格好となる。この開口４３及び案内部４２により、ケーシング１９内には、図３に一点鎖線で示すように、風呂側排気通路２９を通る燃焼ガスの殆どが開口４３から整流板４０の内側に流入して前壁２０の内面に当接した後、再び開口４３から垂下部４１の後方に出て、案内部４２の下方を通って排気口２６から排出される冷却流路４４が形成されることになる。
また、前壁２０における排気口２６の下縁には、前方斜め上へ向けて突出し、前端が筐体内面に当接する傾斜板４５が設けられている。 However, in the bath-side exhaust passage 29 in the casing 19, a quadrangular opening 43 is formed in the hanging portion 41 of the rectifying plate 40 as shown in FIGS. It communicates with the inside of 40. Therefore, the inner space of the exhaust port 26 is partitioned into upper and lower parts by the guide portion 42 of the flow straightening plate 40 protruding rearward from the upper side of the exhaust port 26. Due to the opening 43 and the guide portion 42, most of the combustion gas passing through the bath-side exhaust passage 29 flows into the casing 19 from the opening 43 to the inside of the straightening vane 40, as shown by a dashed line in FIG. After coming into contact with the inner surface of the wall 20, the cooling flow path 44 is again formed from the opening 43 to the rear of the hanging portion 41, passes under the guide portion 42, and is discharged from the exhaust port 26.
Further, an inclined plate 45 is provided at the lower edge of the exhaust port 26 in the front wall 20 so as to project obliquely forward and upward, and the front end abuts the inner surface of the housing.

一方、缶体３内は、第１バーナ群７と第２バーナ群８との間に位置する下仕切部材４６と、給湯側一次熱交換器１１と風呂側一次熱交換器１２との間に位置する中仕切部材４７と、ケーシング１９内の仕切板２７とによって、第１バーナ群７と給湯側一次熱交換器１１と給湯側二次熱交換器１５とが配置される給湯加熱部としての給湯側燃焼室４８と、第２バーナ群８と風呂側一次熱交換器１２と風呂側二次熱交換器１７とが配置される風呂加熱部としての風呂側燃焼室４９とに仕切られている。５０は、燃焼ガスの温度を検出してフィンの閉塞を監視するためのサーミスタである。缶体３の下部には、図示しない給気ファンが接続されて、給気ファンから送られる空気を、各燃焼室４８，４９に供給可能としている。 On the other hand, in the can body 3, between the lower partitioning member 46 located between the first burner group 7 and the second burner group 8, the hot water supply side primary heat exchanger 11 and the bath side primary heat exchanger 12. The middle partition member 47 and the partition plate 27 in the casing 19 serve as a hot water supply heating unit in which the first burner group 7, the hot water supply side primary heat exchanger 11 and the hot water supply side secondary heat exchanger 15 are arranged. It is partitioned into a hot water supply side combustion chamber 48, a second side burner group 8, a bath side primary heat exchanger 12, and a bath side combustion chamber 49 as a bath heating section in which a bath side secondary heat exchanger 17 is arranged. .. Reference numeral 50 is a thermistor for detecting the temperature of the combustion gas and monitoring the blockage of the fins. An air supply fan (not shown) is connected to the lower portion of the can body 3 so that the air sent from the air supply fan can be supplied to the combustion chambers 48, 49.

以上の如く構成された風呂給湯器１においては、出湯管３４に設けられた給湯栓を開栓して器具内に通水させると、給水管３２からの水が、給湯側二次熱交換器１５の伝熱管１６を通過した後、給湯側一次熱交換器１１の伝熱管１４を通過する。一方、器具外に設けられた図示しないコントローラが第１バーナ群７に点火すると共に、給気ファンを回転させて第１バーナ群７に燃焼用空気を供給する。第１バーナ群７の燃焼ガスは、給湯側燃焼室４８内で給湯側一次熱交換器１１、給湯側二次熱交換器１５の順に通過することで、給湯側一次熱交換器１１では主に顕熱が回収され、給湯側二次熱交換器１５では主に潜熱が回収されて、出湯管３４から所定温度の湯が出湯される。 In the bath water heater 1 configured as described above, when the hot water tap provided on the hot water outlet pipe 34 is opened to allow water to flow through the equipment, the water from the water feed pipe 32 becomes the hot water supply side secondary heat exchanger. After passing through the heat transfer tube 16 of No. 15, it passes through the heat transfer tube 14 of the hot water supply side primary heat exchanger 11. On the other hand, a controller (not shown) provided outside the appliance ignites the first burner group 7 and rotates the air supply fan to supply combustion air to the first burner group 7. The combustion gas of the first burner group 7 passes through the hot water supply side primary heat exchanger 11 and the hot water supply side secondary heat exchanger 15 in this order in the hot water supply side combustion chamber 48, so that the hot water supply side primary heat exchanger 11 mainly Sensible heat is recovered, latent heat is mainly recovered in the hot water supply side secondary heat exchanger 15, and hot water of a predetermined temperature is tapped from the tap pipe 34.

そして、コントローラに設けられた追い炊きスイッチをＯＮ操作すると、コントローラが浴槽との間の循環路に設けられたポンプを駆動させて第２バーナ群８に点火すると共に、給気ファンを回転させて第２バーナ群８に燃焼用空気を供給する。浴槽からの湯は、風呂側二次熱交換器１７の伝熱管１８を通過した後、風呂側一次熱交換器１２の伝熱管１４を通過し、第２バーナ群８の燃焼ガスは、風呂側燃焼室４９内で風呂側一次熱交換器１２、風呂側二次熱交換器１７の順に通過する。よって、風呂側一次熱交換器１２では主に顕熱が回収され、風呂側二次熱交換器１７では主に潜熱が回収されて、浴槽内の湯が循環しながら追い焚きされる。 Then, when the additional cooking switch provided in the controller is turned on, the controller drives the pump provided in the circulation path to the bath to ignite the second burner group 8 and rotate the air supply fan. Combustion air is supplied to the second burner group 8. Hot water from the bathtub passes through the heat transfer tube 18 of the bath side secondary heat exchanger 17 and then through the heat transfer tube 14 of the bath side primary heat exchanger 12, and the combustion gas of the second burner group 8 is In the combustion chamber 49, the bath-side primary heat exchanger 12 and the bath-side secondary heat exchanger 17 pass in this order. Therefore, the sensible heat is mainly recovered in the bath-side primary heat exchanger 12, and the latent heat is mainly recovered in the bath-side secondary heat exchanger 17, and the hot water in the bathtub is circulated and reheated.

このとき、二次熱交換器６では、一次熱交換器５を介して流入口２５から流入した燃焼ガスが、給湯側排気通路２８又は風呂側排気通路２９をそれぞれ通り、天井板３９から整流板４０の下側に回り込んで排気口２６から器具外部へ排出される。風呂側排気通路２９では、給気ファンからの給気圧により、燃焼ガスは冷却流路４４へ分岐することはなく、スムーズに排出される。
そして、追い焚きが終了して第２バーナ群８の燃焼が停止すると、給気ファンからの給気圧がなくなることで、風呂側排気通路２９内で滞留した燃焼ガスは、前述のように冷却流路４４に殆ど分岐して一旦開口４３から整流板４０の内側に進入し、前壁２０の内面に接触してから案内部４２の下方に回り込んで排出されることになる。このため、燃焼ガスの雰囲気温度が下がり、ケーシング１９内でドレンが発生しやすくなる。よって、器具外部へ排気された際、器具表面での結露の発生を抑えることができる。なお、ケーシング１９内で発生したドレンは、前下がり傾斜する下壁２３の前方に凹設された凹部５１で受けられ、凹部５１に設けたドレン排出管５２から図示しない中和器へ排出される。 At this time, in the secondary heat exchanger 6, the combustion gas flowing from the inflow port 25 through the primary heat exchanger 5 passes through the hot water supply side exhaust passage 28 or the bath side exhaust passage 29, respectively, and goes from the ceiling plate 39 to the straightening plate. It goes around the lower side of 40 and is discharged to the outside of the device through the exhaust port 26. In the bath-side exhaust passage 29, the combustion gas is smoothly discharged without being branched to the cooling flow path 44 due to the supply pressure from the supply fan.
Then, when the reheating is completed and the combustion of the second burner group 8 is stopped, the supply gas pressure from the supply fan disappears, so that the combustion gas accumulated in the bath-side exhaust passage 29 is cooled as described above. Almost all branches into the passage 44, and once enters the inside of the straightening vane 40 through the opening 43, comes into contact with the inner surface of the front wall 20, and then goes around below the guide portion 42 and is discharged. Therefore, the ambient temperature of the combustion gas is lowered, and drainage is likely to occur in the casing 19. Therefore, when exhausted to the outside of the device, it is possible to suppress the occurrence of dew condensation on the surface of the device. The drain generated in the casing 19 is received by the recess 51 formed in the front of the lower wall 23 that slopes downward and is discharged from the drain discharge pipe 52 provided in the recess 51 to a neutralizer (not shown). ..

このように、上記形態の風呂給湯器１によれば、ケーシング１９内に、風呂側排気通路２９を通る燃焼ガスを、排気口２６が形成される前壁２０の内面に接触させてから排気口２６に導く冷却流路４４を形成したことにより、第２バーナ群８の燃焼終了後に滞留した燃焼ガスが冷却流路４４を通過することで、燃焼ガスの雰囲気温度が下がり、ケーシング１９内でのドレンの発生が促進される。よって、器具外部へ排気された際、器具表面での結露の発生を抑えることができ、風呂側二次熱交換器１７を備えたものであっても、ドレン蒸気による器具表面の腐食を好適に抑制することができる。 As described above, according to the bath water heater 1 of the above-described embodiment, the combustion gas passing through the bath-side exhaust passage 29 is brought into contact with the inner surface of the front wall 20 where the exhaust port 26 is formed, and then the exhaust port is provided in the casing 19. By forming the cooling flow path 44 leading to 26, the combustion gas staying after the combustion of the second burner group 8 passes through the cooling flow path 44, the ambient temperature of the combustion gas is lowered, and the inside of the casing 19 is cooled. The generation of drain is promoted. Therefore, when exhausted to the outside of the appliance, it is possible to suppress the occurrence of dew condensation on the appliance surface, and even if the bath-side secondary heat exchanger 17 is provided, corrosion of the appliance surface due to drain vapor is preferably performed Can be suppressed.

なお、整流板の垂下部に設ける開口の形状や大きさ、数等は、燃焼ガスが垂下部を通過して前壁に接触可能であれば、適宜変更して差し支えない。
また、上記形態では整流板の垂下部に開口を設けて冷却流路を形成しているが、整流板を省略して排気口の上側から流入口側へ伸びる案内板のみを設けて冷却流路を形成してもよい。この場合、案内板によって冷却流路が簡単に形成できる。
さらに、燃焼ガスが前壁と接触する面積を増やすために、前壁の内面に凹凸やリブを設けたり、冷却流路の通過時間を長くするために、上壁と案内部（案内板）とに上下方向の板を互い違いに立設して、冷却流路を蛇行状に形成したりすることも考えられる。 It should be noted that the shape, size, number, etc. of the openings provided in the hanging portion of the current plate may be appropriately changed as long as the combustion gas can pass through the hanging portion and come into contact with the front wall.
Further, in the above-described embodiment, the cooling passage is formed by providing an opening in the hanging portion of the straightening vane, but the straightening plate is omitted and only the guide plate extending from the upper side of the exhaust port to the inlet side is provided and the cooling passage is provided. May be formed. In this case, the cooling flow path can be easily formed by the guide plate.
Further, in order to increase the area in which the combustion gas comes into contact with the front wall, unevenness or ribs are provided on the inner surface of the front wall, and in order to increase the passage time of the cooling flow path, the upper wall and the guide portion (guide plate) are It is also conceivable that the cooling passages are formed in a meandering shape by vertically staggering the plates in the vertical direction.

１・・風呂給湯器、２・・燃焼装置、３・・缶体、４・・バーナユニット、５・・一次熱交換器、６・・二次熱交換器、７・・第１バーナ群、８・・第２バーナ群、１１・・給湯側一次熱交換器、１２・・風呂側一次熱交換器、１５・・給湯側二次熱交換器、１７・・風呂側二次熱交換器、１９・・ケーシング、２０・・前壁、２５・・流入口、２６・・排気口、２７・・仕切板、２８・・給湯側排気通路、２９・・風呂側排気通路、４０・・整流板、４１・・垂下部、４２・・案内部、４３・・開口、４４・・冷却流路、４８・・給湯側燃焼室、４９・・風呂側燃焼室。 1...Bath water heater, 2...Combustion device, 3...Can body, 4...Burner unit, 5...Primary heat exchanger, 6...Secondary heat exchanger, 7...First burner group, 8·· Second burner group, 11·· Hot water supply side primary heat exchanger, 12·· Bath side primary heat exchanger, 15·· Hot water supply side secondary heat exchanger, 17·· Bath side secondary heat exchanger, 19・・Casing, 20・・Front wall, 25・・Inflow port, 26・・Exhaust port, 27・・Partition plate, 28・・Hot water side exhaust passage, 29・・Bath side exhaust passage, 40・・Rectification plate , 41... Hanging part, 42... Guide part, 43... Opening, 44... Cooling channel, 48... Hot water supply side combustion chamber, 49... Bath side combustion chamber

Claims

給湯側バーナと、給湯側一次熱交換器と、給湯側二次熱交換器とを有する給湯加熱部と、
風呂側バーナと、風呂側一次熱交換器と、風呂側二次熱交換器とを有する風呂加熱部と、を備え、
前記給湯側二次熱交換器と前記風呂側二次熱交換器とがケーシングに収容され、当該ケーシングの前後何れか一方の壁には、前記給湯側一次熱交換器及び前記風呂側一次熱交換器を通過した燃焼ガスが流入する流入口が、他方の壁には、流入した燃焼ガスが排出される排気口がそれぞれ設けられて、前記ケーシング内には、前記給湯側二次熱交換器を通過する給湯側排気通路と、前記風呂側二次熱交換器を通過する風呂側排気通路とが仕切り形成されてなる風呂給湯器であって、
前記ケーシング内には、前記風呂側排気通路を通る燃焼ガスを、前記排気口が形成される前記壁の内面に接触させてから前記排気口に導く冷却流路が形成されている一方、
前記排気口が形成される前記壁の内面には、前記排気口の上側から前記流入口側に突出して前記排気口の内側空間を上下に仕切る左右方向の案内板が設けられていることを特徴とする風呂給湯器。 A hot water supply heating section having a hot water supply side burner, a hot water supply side primary heat exchanger, and a hot water supply side secondary heat exchanger;
A bath-side burner, a bath-side primary heat exchanger, and a bath-heating unit having a bath-side secondary heat exchanger,
The hot water supply side secondary heat exchanger and the bath side secondary heat exchanger are housed in a casing, and the hot water supply side primary heat exchanger and the bath side primary heat exchange are provided on one of the front and rear walls of the casing. An inlet through which the combustion gas that has passed through the furnace flows, and an exhaust port through which the inflowing combustion gas is discharged is provided on the other wall, and the hot water supply side secondary heat exchanger is provided in the casing. A bath water heater in which a hot water supply side exhaust passage that passes through and a bath side exhaust passage that passes through the bath side secondary heat exchanger are formed by partitioning,
In the casing, while forming a cooling flow path, the combustion gas passing through the bath-side exhaust passage is brought into contact with the inner surface of the wall where the exhaust port is formed and then guided to the exhaust port ,
An inner surface of the wall in which the exhaust port is formed is provided with a horizontal guide plate that protrudes from the upper side of the exhaust port toward the inflow port and vertically divides an inner space of the exhaust port. Bath water heater.