JP2017150762A - Bath hot water supply device - Google Patents

Bath hot water supply device Download PDF

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JP2017150762A
JP2017150762A JP2016034576A JP2016034576A JP2017150762A JP 2017150762 A JP2017150762 A JP 2017150762A JP 2016034576 A JP2016034576 A JP 2016034576A JP 2016034576 A JP2016034576 A JP 2016034576A JP 2017150762 A JP2017150762 A JP 2017150762A
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bath
heat exchanger
hot water
water supply
secondary heat
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JP6715032B2 (en
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克宜 宮地
Katsunobu Miyachi
克宜 宮地
太陽 小舘
Taiyo Kodate
太陽 小舘
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Paloma Co Ltd
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Abstract

PROBLEM TO BE SOLVED: To preferably suppress corrosion at an implement surface due to drain steam even when being provided with a bath-side secondary heat exchanger.SOLUTION: An opening 43 for communicating a bath-side exhaust passage 29 to an inner side of a current plate 40 is provided in the current plate 40 provided inside a casing 19 for the secondary heat exchanger 6 in a bath hot water supply device to form a cooling flow passage 44 for bringing a combustion gas passing through the bath-side exhaust passage 29 into contact with an inner face of a front wall 20 in which an exhaust port 26 is formed and then leading the combustion gas to the exhaust port 26.SELECTED DRAWING: Figure 3

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 provided with a hot water heater and a bath heater.

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, bath water heaters having a function of heating hot water in a bathtub have been widely used in practice. This bath water heater is provided with a burner and a heat exchanger in a combustion chamber formed in the appliance, and the combustion chamber is divided into a hot water heating section and a bath heating section, and a water pipe is connected to the heat exchanger of the hot water heating section. And a hot water pipe are connected, and a return pipe and a forward pipe of a bathtub are connected to a heat exchanger of a bath heating section.
In addition, in order to increase heat efficiency, the heat exchanger mainly includes a primary heat exchanger (main heat exchanger) that recovers sensible heat, and a secondary heat exchanger (sub heat exchanger) that mainly recovers latent heat. May be formed. In the bath water heater, for example, as disclosed in Patent Document 1, the inside of the casing of the secondary heat exchanger is divided 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 used. 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. . The combustion exhaust from the burner enters the respective regions 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 a bath water heater that employs a bath-side secondary heat exchanger, the combustion exhaust that passes through the bath-side secondary heat exchanger is smoothly discharged from the exhaust port during the combustion of the bath-side burner by the supply air pressure of the supply fan. . However, when the combustion of the bath-side burner is completed and the supply air pressure from the air supply fan disappears, the drain generated by heat exchange in the bath-side secondary heat exchanger stays in the casing as steam containing nitric acid. However, it is discharged from the exhaust port over time. For this reason, the generated steam tends to contact the surface of the instrument and cause condensation, which may corrode the instrument surface.

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 aims to provide a bath water heater that can suitably suppress corrosion of the appliance surface due to drain steam, even if it has a bath-side secondary heat exchanger. 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ことを特徴とする。
請求項２に記載の発明は、請求項１の構成において、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 described in claim 1 includes 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 heating unit having a bath side burner, a bath side primary heat exchanger, and a bath side secondary heat exchanger;
The hot water supply side secondary heat exchanger and the bath side secondary heat exchanger were accommodated in the casing, and either the front or back wall of the casing passed through the hot water supply side primary heat exchanger and the bath side primary heat exchanger. An inflow port through which the combustion gas flows in is provided, and an exhaust port through which the inflowed combustion gas is discharged is provided in 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 water heater in which a bath side exhaust passage passing through the bath side secondary heat exchanger is formed as a partition,
A cooling flow path is formed in the casing for bringing the combustion gas passing through the bath-side exhaust passage into contact with the inner surface of the wall on which the exhaust port is formed, and then leading to the exhaust port.
According to a second aspect of the present invention, in the configuration of the first aspect, the inner surface of the wall in which the exhaust port is formed projects from the upper side of the exhaust port to the inflow port side to partition the inner space of the exhaust port vertically A guide plate is provided.

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。
請求項２に記載の発明によれば、請求項１の効果に加えて、案内板によって冷却流路が簡単に形成できる。 According to the first aspect of the present invention, the cooling gas that contacts the inner surface of the wall on the exhaust port side is formed in the casing, so that the combustion gas remaining after the combustion of the bath-side burner is cooled. By passing through the flow path, the atmospheric temperature of the combustion gas decreases, and the generation of drain in the casing is promoted. Therefore, when exhausted to the outside of the appliance, it is possible to suppress the occurrence of condensation on the appliance surface, and even if equipped with a bath-side secondary heat exchanger, corrosion of the appliance surface due to drain vapor is suitably suppressed. can do.
According to the second aspect of the present invention, in addition to the effect of the first aspect, the cooling channel 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 a 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 a 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 the perspective view from the front of the casing which abbreviate | omitted the heat exchanger tube of the side wall and the bath side secondary heat exchanger, (B) is the perspective view which abbreviate | omitted the upper board further. （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 the perspective view from the back of the casing which abbreviate | omitted the heat exchanger tube of the side wall and the bath side secondary heat exchanger, (B) is the perspective view which abbreviate | omitted the upper board further.

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。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a cross-sectional view illustrating an example of a bath water heater. This bath water heater 1 includes a combustion device 2 in a housing (not shown), and the combustion device 2 is inserted into a can body 3 that communicates with the inside from a lower side, a burner unit 4, a primary heat exchanger 5, and a secondary. The heat exchangers 6 are provided in this order.
First, in the burner unit 4, the 1st burner group 7 and the 2nd burner group 8 are arranged in parallel in the left-right direction. Each of the burner groups 7 and 8 is formed by arranging a plurality of flat burners 9, 9... Each having a flame hole in the upper end surface in the left-right direction, and supplying gas to the rear end of the mixing tube 10 provided at the lower part of each burner 9. Combustion primary air is supplied together with gas, facing a nozzle (not shown) connected to the pipe. Here, the first burner group 7 is a hot water supply side burner and the second burner group 8 is a bath side burner, and the number of burners 9 of the first burner group 7 having a large capacity is made larger than that of the second burner group 8. Yes.

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. Side by side. Each of the heat exchangers 11 and 12 includes fins 13, 13... That are stacked at a predetermined interval in the front-rear direction, and a heat transfer tube 14 that passes through the fins 13 in a meandering manner.
Moreover, in the secondary heat exchanger 6, the hot water supply side secondary heat exchanger 15 which is located above the hot water supply side primary heat exchanger 11 and includes a plurality of heat transfer tubes 16.16, which are wound in a spiral shape, A bath-side secondary heat exchanger 17 that is positioned above the bath-side primary heat exchanger 12 and includes a plurality of 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 accommodated 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, the rear wall 21 of the casing 19 is formed with an inlet 25 for the combustion gas that has passed through the primary heat exchanger 5, and the exhaust outlet 26 is formed in the left and right direction on the front wall 20, respectively. ing. Here, the front wall 20, the rear wall 21, the upper wall 22, and the lower wall 23 of the casing 19 include an upper portion of the exhaust port 26 in the front wall 20 and an upper portion of the inlet 25 in the upper wall 22 and the rear wall 21. By assembling the integrated upper plate 19A and 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 inlet 25 are integrated. It is formed.
In addition, a partition plate 27 that partitions the hot water supply side secondary heat exchanger 15 and the bath side secondary heat exchanger 17 in the front-rear direction is provided inside the casing 19, and the inlet 25 is provided in the casing 19. The combustion gas flowing in from the hot water supply side secondary heat exchanger 15 passes between the heat transfer tubes 16, 16... And discharged from the exhaust port 26. A bath side exhaust passage 29 that passes between the heat transfer tubes 18 of the side secondary heat exchanger 17 and exhausts from the exhaust port 26 is formed.

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, the right side wall 24 of the casing 19 is provided with an inlet 30 and an outlet 31 of the heat transfer pipe 16 of the hot water supply side secondary heat exchanger 15, and a water supply pipe 32 is connected to the inlet 30. The connection pipe 33 to the inlet of the heat transfer pipe 14 of the hot water supply side primary heat exchanger 11 is connected. An 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. 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 outgoing pipe 38 to the bathtub is connected to the outlet of the heat transfer tube 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。   In the casing 19, a ceiling plate 39 that is inclined downward toward the front is provided on the lower side of the upper wall 22. In front of the ceiling plate 39, a drooping portion 41 that hangs down in parallel with the front wall 20 from a rear position spaced from the front wall 20 and extends to a position slightly below the center in the vertical direction in the casing 19; A rectifying plate 40 is provided that includes a guide portion 42 in the left-right direction as a guide plate that extends obliquely upward from the lower end of the drooping portion 41 and is connected to the upper end of the exhaust port 26. The partition plate 27 is formed up to a position where it contacts the hanging portion 41 of the rectifying plate 40. Therefore, when the combustion gas passing through the hot water supply side exhaust passage 28 and the bath side exhaust passage 29 from the inlet 25 comes into contact with the drooping portion 41 of the rectifying plate 40, the combustion gas descends along the drooping portion 41 as shown by the dotted arrow. After that, it moves under the drooping portion 41 and moves forward along the guide portion 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 rectangular opening 43 is formed in the hanging portion 41 of the rectifying plate 40, as shown in FIGS. The inside of 40 is connected. Therefore, the inner space of the exhaust port 26 is vertically partitioned by the guide portion 42 of the rectifying 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 rectifying plate 40, as indicated by a one-dot chain line in FIG. 3. After coming into contact with the inner surface of the wall 20, a cooling channel 44 is formed which again exits from the opening 43 to the rear of the hanging portion 41 and passes through the lower portion of the guide portion 42 and is discharged from the exhaust port 26.
In addition, an inclined plate 45 is provided at the lower edge of the exhaust port 26 in the front wall 20 so as to protrude diagonally forward and the front end contacts 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, the inside of the can 3 is between the lower partition member 46 positioned between the first burner group 7 and the second burner group 8, and the hot water supply side primary heat exchanger 11 and the bath side primary heat exchanger 12. 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 by the positioned intermediate partition member 47 and the partition plate 27 in the casing 19. The hot water supply side combustion chamber 48, the second burner group 8, the bath side primary heat exchanger 12, and the bath side secondary heat exchanger 17 are partitioned into a bath side combustion chamber 49 as a bath heating unit. . Reference numeral 50 denotes 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 3 so that air sent from the air supply fan can be supplied to the combustion chambers 48 and 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 in the hot water discharge pipe 34 is opened and water is passed through the appliance, the water from the water supply pipe 32 is supplied to the hot water supply side secondary heat exchanger. After passing through the 15 heat transfer tubes 16, 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 mainly in the hot water supply side primary heat exchanger 11. Sensible heat is recovered, and the hot water supply side secondary heat exchanger 15 mainly recovers latent heat, and hot water of a predetermined temperature is discharged from the hot water discharge 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。   And when the additional cooking switch provided in the controller is turned ON, the controller drives the pump provided in the circulation path between the bathtub and ignites the second burner group 8 and rotates the air supply fan. Combustion air is supplied to the second burner group 8. The hot water from the bathtub passes through the heat transfer pipe 18 of the bath side primary heat exchanger 12 after passing through the heat transfer pipe 18 of the bath side secondary heat exchanger 17, and the combustion gas of the second burner group 8 flows into the bath side. In the combustion chamber 49, the bath side primary heat exchanger 12 and the bath side secondary heat exchanger 17 are passed 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, so that the hot water in the bathtub is circulated and chased away.

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 in from the inlet 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, from the ceiling plate 39 to the rectifying plate. It goes around the lower side of 40 and is discharged from the exhaust port 26 to the outside of the instrument. In the bath side exhaust passage 29, the combustion gas is smoothly discharged without branching to the cooling flow path 44 due to the supply air pressure from the air supply fan.
When the reheating is completed and the combustion of the second burner group 8 is stopped, the supply air pressure from the supply fan disappears, so that the combustion gas staying in the bath side exhaust passage 29 is cooled as described above. It almost branches into the path 44 and once enters the inside of the rectifying plate 40 from the opening 43, comes into contact with the inner surface of the front wall 20, then wraps around the guide portion 42 and is discharged. For this reason, the atmospheric temperature of the combustion gas is lowered, and drainage is easily generated in the casing 19. Therefore, it is possible to suppress the occurrence of condensation on the surface of the instrument when exhausted to the outside of the instrument. The drain generated in the casing 19 is received by a recess 51 that is recessed in front of the lower wall 23 that is inclined downward and is discharged from a 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。   Thus, according to the bath water heater 1 of the said form, after making the combustion gas which passes the bath side exhaust passage 29 in the casing 19 contact the inner surface of the front wall 20 in which the exhaust port 26 is formed, it is an exhaust port. By forming the cooling flow path 44 leading to 26, the combustion gas staying after the completion of the combustion of the second burner group 8 passes through the cooling flow path 44, so that the ambient temperature of the combustion gas decreases, and the inside of the casing 19 Generation of drainage is promoted. Therefore, when exhausted to the outside of the appliance, the occurrence of condensation on the appliance surface can be suppressed, and even if the bath-side secondary heat exchanger 17 is provided, the appliance surface is suitably corroded by drain steam. 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。 Note that the shape, size, number, and the like of the openings provided in the hanging part of the current plate may be changed as appropriate as long as the combustion gas can pass through the hanging part and contact the front wall.
Further, in the above embodiment, the cooling channel is formed by providing an opening in the hanging portion of the rectifying plate, but only the guide plate extending from the upper side of the exhaust port to the inlet side is provided by omitting the rectifying plate. May be formed. In this case, the cooling channel can be easily formed by the guide plate.
Furthermore, in order to increase the area where the combustion gas comes into contact with the front wall, the upper wall and the guide part (guide plate) are provided in order to provide irregularities and ribs on the inner surface of the front wall, and to increase the passage time of the cooling channel. It is also conceivable that vertical cooling plates are alternately arranged to form a cooling channel in a meandering manner.

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. 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 .. Inlet, 26 .. Exhaust port, 27 .. Partition plate, 28 .. Hot water supply side exhaust passage, 29 .. Bath side exhaust passage, 40. , 41... Hanging part, 42... Guide part, 43... Opening, 44... Cooling channel, 48... Hot water supply side combustion chamber, 49.

Claims (2)

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ことを特徴とする風呂給湯器。 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 heating unit having a bath side burner, a bath side primary heat exchanger, and a bath side secondary heat exchanger;
The hot water supply side secondary heat exchanger and the bath side secondary heat exchanger are accommodated in a casing, and either the front or back wall of the casing has the hot water supply side primary heat exchanger and the bath side primary heat exchange. An inlet for the combustion gas that has passed through the heater is provided, and an exhaust port for discharging the introduced combustion gas 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 partitioned,
A cooling flow path is formed in the casing for bringing the combustion gas passing through the bath-side exhaust passage into contact with the inner surface of the wall on which the exhaust port is formed, and then leading to the exhaust port. A bath water heater. 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請求項１に記載の風呂給湯器。   The inner surface of the wall in which the exhaust port is formed is provided with a left and right guide plate that projects from the upper side of the exhaust port to the inlet side and partitions the inner space of the exhaust port up and down. The bath water heater according to claim 1.
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Publication number Priority date Publication date Assignee Title
CN108106012A (en) * 2017-12-11 2018-06-01 重庆驰鼎节能科技有限公司 It can be in the Hot water units that low temperature environment uses
JP2019143824A (en) * 2018-02-16 2019-08-29 株式会社ノーリツ Hot water heating device
JP2020079668A (en) * 2018-11-12 2020-05-28 株式会社パロマ Heat exchanger and combined water heater

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JP2009243725A (en) * 2008-03-31 2009-10-22 Rinnai Corp Latent heat recovery type heat source machine
JP2015124920A (en) * 2013-12-26 2015-07-06 リンナイ株式会社 Latent heat exchanger and water heater with the same

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JP2009243725A (en) * 2008-03-31 2009-10-22 Rinnai Corp Latent heat recovery type heat source machine
JP2015124920A (en) * 2013-12-26 2015-07-06 リンナイ株式会社 Latent heat exchanger and water heater with the same

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108106012A (en) * 2017-12-11 2018-06-01 重庆驰鼎节能科技有限公司 It can be in the Hot water units that low temperature environment uses
JP2019143824A (en) * 2018-02-16 2019-08-29 株式会社ノーリツ Hot water heating device
JP7040101B2 (en) 2018-02-16 2022-03-23 株式会社ノーリツ Hot water heating device
JP2020079668A (en) * 2018-11-12 2020-05-28 株式会社パロマ Heat exchanger and combined water heater
JP7248275B2 (en) 2018-11-12 2023-03-29 株式会社パロマ Heat exchangers and combined water heaters

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