JP2019215111A - Heat exchanger and hot water heater - Google Patents

Heat exchanger and hot water heater Download PDF

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JP2019215111A
JP2019215111A JP2018111324A JP2018111324A JP2019215111A JP 2019215111 A JP2019215111 A JP 2019215111A JP 2018111324 A JP2018111324 A JP 2018111324A JP 2018111324 A JP2018111324 A JP 2018111324A JP 2019215111 A JP2019215111 A JP 2019215111A
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heat exchanger
hot water
bath
water supply
casing
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悟 中川
Satoru Nakagawa
悟 中川
中西　渉
Wataru Nakanishi
渉 中西
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Paloma Co Ltd
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Paloma Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

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  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
  • Details Of Fluid Heaters (AREA)

Abstract

To enable easy processing of a component divisionally formed and achieve reduction of assembly processes.SOLUTION: In a secondary heat exchanger 6, a hot water supply side secondary heat exchanger 15 comprising multiple heat absorption pipes 16, 16 .. wound in a spiral shape and a bath side secondary heat exchanger 17 comprising multiple heat absorption pipes 18, 18 .. wound in a spiral shape are provided parallel to each other at left and right sides in a box shaped casing 20. The casing 20 is formed by assembling two components, an upper case 21 in which a lower surface is opened and a peripheral surface and an upper surface are closed and a lower case 22 in which an upper surface is opened and a peripheral surface and a lower surface are closed.SELECTED DRAWING: Figure 1

Description

本発明は、潜熱回収型の給湯器等に用いられる潜熱回収用の熱交換器と、その熱交換器を備えた給湯器とに関する。   The present invention relates to a latent heat recovery heat exchanger used for a latent heat recovery type water heater and the like, and to a water heater provided with the heat exchanger.

給湯器等に用いられる熱交換器としては、主に顕熱を回収する熱交換器に加えて、熱効率を高めるため、顕熱回収後の燃焼ガスから主に潜熱を回収するために使用される熱交換器が知られている。この潜熱回収用の熱交換器は、例えば特許文献１に開示されるように、平面視が矩形状となる箱形のケーシングを有して内部に複数の吸熱管が蛇行形状や螺旋形状で配設されて、ケーシングを通過するバーナの燃焼ガスと吸熱管を通過する流体との間で潜熱が回収可能となっている。ここでのケーシングは、従来多数の金属板を溶接等により接合して作成することで部品点数が多くなって組立作業も煩雑化するという問題に鑑み、一枚の金属板を絞り加工して上方開口部を有する箱状のケーシング本体と、ケーシング本体の上方開口部を閉塞する天板との２部品で分割形成されている。   Heat exchangers used in water heaters, etc. are mainly used to recover latent heat from combustion gas after recovery of sensible heat in order to increase thermal efficiency, in addition to heat exchangers that mainly recover sensible heat Heat exchangers are known. As disclosed in Patent Document 1, for example, this heat exchanger for latent heat recovery has a box-shaped casing having a rectangular shape in plan view, and a plurality of heat-absorbing tubes are arranged inside in a meandering shape or a spiral shape. The latent heat can be recovered between the combustion gas of the burner passing through the casing and the fluid passing through the heat absorbing tube. In consideration of the problem that the number of parts is increased and the assembly work is complicated by forming a large number of metal plates by welding or the like in the past, the casing is formed by drawing one metal plate and forming It is divided into two parts, a box-shaped casing main body having an opening, and a top plate for closing the upper opening of the casing main body.

特開２０１３−１３３９５５号公報JP 2013-133955 A

上記従来のケーシングでは、２部品で分割形成されているため、熱交換器の組み立てに必要な溶接等の組立工程が低減される。しかし、ケーシング本体を深底状に絞り加工を行う必要があるため、複数回の絞り工程が必要となって加工が難しいという問題があった。   In the above-mentioned conventional casing, since it is formed in two parts, the number of assembling steps such as welding required for assembling the heat exchanger is reduced. However, since it is necessary to draw the casing body in a deep bottom shape, there is a problem that a plurality of drawing steps are required and the working is difficult.

そこで、本発明は、組立工程を低減しつつ、分割形成される部品の加工も容易に行うことができる潜熱回収用の熱交換器及び給湯器を提供することを目的としたものである。   Therefore, an object of the present invention is to provide a heat exchanger and a water heater for recovering latent heat, which can easily process parts formed separately while reducing the number of assembly steps.

上記目的を達成するために、請求項１に記載の発明は、箱形のケーシング内に吸熱管を収容してなり、顕熱回収用の熱交換器を通過した燃焼ガスから潜熱を回収するために用いられる潜熱回収用の熱交換器であって、
ケーシングは、下面を開口して周面及び上面を閉塞した上側ケースと、上面を開口して周面及び下面を閉塞した下側ケースとの２部品を組み付けて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、上側ケースと下側ケースとは、共に１枚の金属板を絞り加工して形成されることを特徴とする。
上記目的を達成するために、請求項３に記載の発明は、給湯器であって、バーナと、バーナの燃焼ガスの流れの上流側に配置される顕熱回収用の熱交換器と、当該流れの下流側に配置される請求項１又は２に記載の潜熱回収用の熱交換器とを含んでなることを特徴とするものである。 In order to achieve the above object, the invention according to claim 1 includes a box-shaped casing containing a heat absorbing tube and recovering latent heat from combustion gas that has passed through a heat exchanger for recovering sensible heat. A latent heat recovery heat exchanger used for
The casing is formed by assembling two parts, an upper case having an open lower surface and closing a peripheral surface and an upper surface, and a lower case having an open upper surface and closing a peripheral surface and a lower surface. .
According to a second aspect of the present invention, in the configuration of the first aspect, both the upper case and the lower case are formed by drawing a single metal plate.
In order to achieve the above object, an invention according to claim 3 is a water heater, comprising: a burner; a heat exchanger for sensible heat recovery disposed upstream of a flow of combustion gas of the burner; A latent heat recovery heat exchanger according to claim 1 or 2, which is disposed downstream of the flow.

請求項１及び３に記載の発明によれば、ケーシングを、下面を開口して周面及び上面を閉塞した上側ケースと、上面を開口して周面及び下面を閉塞した下側ケースとの２部品を組み付けて形成しているので、組立工程を低減することができる。また、上側ケースと下側ケースとは共に深底形状とならないため、分割形成される部品の加工も容易に行うことができる。
請求項２に記載の発明によれば、上記効果に加えて、上側ケースと下側ケースとは、共に１枚の金属板を絞り加工して形成しているので、深い絞り加工を行う必要がなく、加工性に優れたものとなる。 According to the first and third aspects of the present invention, the casing is divided into an upper case having a lower surface opened and a peripheral surface and an upper surface closed, and a lower case having an upper surface opened and a peripheral surface and a lower surface closed. Since the parts are assembled, the assembly process can be reduced. Further, since both the upper case and the lower case do not have a deep bottom shape, it is possible to easily process the parts formed separately.
According to the second aspect of the present invention, in addition to the above-described effects, since both the upper case and the lower case are formed by drawing one metal plate, it is necessary to perform deep drawing. And excellent in workability.

風呂給湯器の断面図である。It is sectional drawing of a bath water heater. 二次熱交換器の正面図である。It is a front view of a secondary heat exchanger. 図２のＡ−Ａ線断面図である。FIG. 3 is a sectional view taken along line AA of FIG. 2. 図２のＢ−Ｂ線断面図である。FIG. 3 is a sectional view taken along line B-B in FIG. 2.

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、複合給湯器の一例である風呂給湯器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、主に顕熱を回収する顕熱回収用の一次熱交換器５、主に潜熱を回収する潜熱回収用の熱交換器としての二次熱交換器６の順に備えている。
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、燃料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 sectional view showing a bath water heater which is an example of a combined water heater. The bath water heater 1 includes a combustion device 2 in a casing (not shown). The combustion device 2 includes a burner unit 4, which mainly collects sensible heat, from below in a can body 3 communicating with the inside. A primary heat exchanger 5 for heat recovery and a secondary heat exchanger 6 as a latent heat recovery heat exchanger for recovering mainly latent heat are provided 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 composed of a plurality of flat burners 9, 9... Having a flame hole formed on the upper end surface arranged in a horizontal direction. The primary air for combustion is supplied together with the fuel gas by 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. The number of the burners 9 in the first burner group 7 having a large capacity is larger than that of the second burner group 8. I have.

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吸熱管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吸熱管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。 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. It is installed side by side. Each of the heat exchangers 11 and 12 is composed of a plurality of stacked fins 13, 13... 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, 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 absorbing tubes 16.16. The bath-side secondary heat exchanger 17, which is located above the bath-side primary heat exchanger 12 and includes a plurality of heat-absorbing tubes 18, 18, ... wound spirally, is arranged side by side.

この給湯側二次熱交換器１５及び風呂側二次熱交換器１７は、図２，３にも示すように、上側ケース２１と下側ケース２２とからなる箱状のケーシング２０に収容されている。上側ケース２１は、前後左右の周囲４面と上面とで囲まれて下面が開口する箱状で、一枚の金属板を絞り加工して形成され、下面の開口周縁には上フランジ部２３が略全周に一体形成されている。
下側ケース２２は、前後左右の周囲４面と底面とで囲まれて上面が開口する箱状で、一枚の金属板を絞り加工して形成され、上面の開口周縁には下フランジ部２４が略全周に一体形成されている。但し、下側ケース２２は上側ケース２１よりも深さが大きくなって、底面は前下がり傾斜している。
よって、ケーシング２０は、下側ケース２２に上側ケース２１を重ねた状態で、上フランジ部２３と下フランジ部２４とを溶接やロウ付け等で接合することで形成される。下側ケース２２の後面には、一次熱交換器５を通過した燃焼ガスの流入口２５が、前面には、ケーシング２０内を通過した燃焼ガスの排気口２６がそれぞれ左右方向に形成されている。 The hot water supply side secondary heat exchanger 15 and the bath side secondary heat exchanger 17 are housed in a box-shaped casing 20 composed of an upper case 21 and a lower case 22, as shown in FIGS. I have. The upper case 21 is formed in a box shape having a lower surface opened by being surrounded by four front, rear, left and right peripheral surfaces and an upper surface, formed by drawing a single metal plate, and an upper flange portion 23 is formed on an opening periphery of the lower surface. It is integrally formed substantially all around.
The lower case 22 is formed in a box shape whose upper surface is open and surrounded by four front and rear sides and a bottom surface. The lower case 22 is formed by drawing a single metal plate, and a lower flange portion 24 is formed around the opening on the upper surface. Are formed integrally over substantially the entire circumference. However, the lower case 22 is deeper than the upper case 21 and the bottom surface is inclined forward and downward.
Therefore, the casing 20 is formed by joining the upper flange portion 23 and the lower flange portion 24 by welding, brazing, or the like in a state where the upper case 21 is overlaid on the lower case 22. An inlet 25 for the combustion gas that has passed through the primary heat exchanger 5 is formed on the rear surface of the lower case 22, and an exhaust port 26 for the combustion gas that has passed inside the casing 20 is formed on the front surface in the left-right direction. .

また、ケーシング２０の内部には、図４にも示すように、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いる。この仕切板２７によりケーシング２０内には、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の吸熱管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の吸熱管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とが形成されている。
但し、仕切板２７における後側領域には、通気部としての複数の円形の透孔３０，３０・・が形成されて、給湯側排気通路２８と風呂側排気通路２９とを透孔３０，３０・・を介して互いに連通させている。 In addition, as shown in FIG. 4, a partition plate 27 that partitions between the hot water supply side secondary heat exchanger 15 and the bath side secondary heat exchanger 17 is provided inside the casing 20 in the front-rear direction. . Due to the partition plate 27, the combustion gas flowing from the inlet 25 into the casing 20 passes through the heat absorption tubes 16, 16,... Of the hot water supply-side secondary heat exchanger 15, and is discharged through the exhaust port 26. A passage 28 and a bath-side exhaust passage 29 through which the combustion gas flowing from the inflow port 25 passes through the heat-absorbing tubes 18 of the bath-side secondary heat exchanger 17 and is discharged from the exhaust port 26 are formed. I have.
However, a plurality of circular through holes 30 are formed in the rear region of the partition plate 27 as ventilation portions, and the through holes 30, 30 are formed between the hot water supply side exhaust passage 28 and the bath side exhaust passage 29. .. are communicated with each other via.

さらに、ケーシング２０の左側面には、給湯側二次熱交換器１５の吸熱管１６，１６・・の端部とそれぞれ連通する入側ヘッダ３１と出側ヘッダ３２とがそれぞれ上下に設けられている。入側ヘッダ３１には、入口３３が設けられて給水管３４が接続されている。出側ヘッダ３２には、出口３５が設けられて、給湯側一次熱交換器１１の伝熱管１４の入口への接続管３６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３７が接続される。
一方、ケーシング２０の右側面には、風呂側二次熱交換器１７の吸熱管１８，１８・・の端部とそれぞれ連通する入側ヘッダ３８と出側ヘッダ３９とがそれぞれ前後に設けられている。入側ヘッダ３８には、入口４０が設けられて、浴槽からの戻り配管４１が接続されている。出側ヘッダ３９には、出口４２が設けられて、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４３が接続されている。 Further, on the left side surface of the casing 20, an inlet header 31 and an outlet header 32 which respectively communicate with the ends of the heat absorbing tubes 16, 16,... Of the hot water supply secondary heat exchanger 15 are provided vertically. I have. The entrance header 31 is provided with an entrance 33 to which a water supply pipe 34 is connected. An outlet 35 is provided in the outlet header 32, and a connection pipe 36 to the inlet of the heat transfer pipe 14 of the hot water supply-side primary heat exchanger 11 is connected. A tapping pipe 37 is connected to an outlet of the heat transfer pipe 14 of the hot water supply side primary heat exchanger 11.
On the other hand, on the right side surface of the casing 20, an inlet header 38 and an outlet header 39 communicating with ends of the heat absorbing tubes 18, 18,... Of the bath-side secondary heat exchanger 17, respectively, are provided in front and rear, respectively. I have. The entrance header 38 is provided with an entrance 40 to which a return pipe 41 from the bathtub is connected. The outlet header 39 is provided with an outlet 42, and a connection pipe (not shown) to the inlet of the heat transfer pipe 14 of the bath-side primary heat exchanger 12 is connected. An outlet pipe 43 of the bath-side primary heat exchanger 12 is connected to an outgoing pipe 43 to a bathtub.

そして、ケーシング２０内で、上側ケース２１の下側には、図３に示すように、前方へ向かって下り傾斜する天井板４５が設けられている。この天井板４５の前方には、上側ケース２１の前面から所定間隔をおいた後方位置から前面と平行に垂下し、ケーシング２０内の上下方向中央よりやや下側位置まで伸びる垂下部４７と、その垂下部４７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左右方向の案内部４８とからなる整流板４６が設けられている。
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を前方へ移動する燃焼ガスは、整流板４６の垂下部４７に当接すると、点線矢印で示すように、垂下部４７に沿って下降した後、垂下部４７の下方を回り込んで案内部４８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。
また、下側ケース２２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４９が設けられている。 In the casing 20, below the upper case 21, a ceiling plate 45 that is inclined downward and forward is provided as shown in FIG. In front of the ceiling plate 45, a hanging portion 47 that hangs from a rear position at a predetermined distance from the front surface of the upper case 21 in parallel with the front surface and extends to a position slightly lower than the center in the vertical direction in the casing 20, A rectifying plate 46 is provided, which extends obliquely upward and forward from the lower end of the hanging part 47 and is connected to the upper end of the exhaust port 26 and has a left-right guide portion 48.
Therefore, when the combustion gas moving forward 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 hanging portion 47 of the rectifying plate 46, as shown by the dotted arrow, the combustion gas moves along the hanging portion 47. After descending, it goes under the hanging part 47, moves forward along the guide part 48, and is discharged from the exhaust port 26.
At the lower edge of the exhaust port 26 of the lower case 22, an inclined plate 49 is provided which protrudes obliquely forward and upward, and whose 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５０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５１とが設けられている。この下仕切部材５０と中仕切部材５１と仕切板２７とによって、缶体３内は、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側燃焼室５２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側燃焼室５３とに仕切られている。下仕切部材５０には、燃焼ガスの温度を検出してフィン１３の閉塞を監視するためのサーミスタ５４が設けられている。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５２，５３に供給可能としている。   On the other hand, the inside of the can 3 is located between the lower partition member 50 located 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. An intermediate partition member 51 is provided. By the lower partition member 50, the middle partition member 51, and the partition plate 27, 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 in the can body 3. It is partitioned into a hot water supply side combustion chamber 52, and a bath side combustion chamber 53 in which the second burner group 8, the bath side primary heat exchanger 12, and the bath side secondary heat exchanger 17 are arranged. The lower partition member 50 is provided with a thermistor 54 for detecting the temperature of the combustion gas and monitoring the blockage of the fin 13. An air supply fan (not shown) is connected to a lower portion of the can body 3 so that air sent from the air supply fan can be supplied to each of the combustion chambers 52 and 53.

以上の如く構成された風呂給湯器１においては、出湯管３７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３４からの水が、給湯側二次熱交換器１５の吸熱管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５２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３７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 tapping pipe 37 is opened and water is passed through the appliance, the water from the water supply pipe 34 is supplied to the hot water supply side secondary heat exchanger. After passing through the 15 heat absorption tubes 16, it passes through the heat transfer tubes 14 of the hot water supply side primary heat exchanger 11. On the other hand, a controller (not shown) provided outside the apparatus 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 mainly passes through the hot water supply side primary heat exchanger 11 by passing through the hot water supply side primary heat exchanger 11 and the hot water supply side secondary heat exchanger 15 in the hot water supply side combustion chamber 52 in this order. The sensible heat is recovered, the latent heat is mainly recovered in the hot water supply side secondary heat exchanger 15, and hot water of a predetermined temperature is discharged from the tapping pipe 37.

一方、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の吸熱管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５３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。   On the other hand, when the additional cooking switch provided in the controller is turned on, the controller drives a pump provided in a circulation path between the controller and the bath to ignite the second burner group 8 and rotate the air supply fan. The combustion air is supplied to the second burner group 8. Hot water from the bathtub passes through the heat absorption tube 18 of the bath-side secondary heat exchanger 17 and then passes 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 discharged from the bath side. In the combustion chamber 53, the water passes through the bath-side primary heat exchanger 12 and the bath-side secondary heat exchanger 17 in this order. Therefore, sensible heat is mainly recovered in the bath-side primary heat exchanger 12, and 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４５から整流板４６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。
そして、風呂側の単独使用の際、浴槽の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、図４に点線矢印で示すように、仕切板２７の透孔３０，３０・・から給湯側排気通路２８内に流れ込み、熱交換されていない吸熱管１６やケーシング２０の内面に接触する。よって、燃焼ガスの温度が低下してケーシング２０内で再凝縮してドレンが発生しやすくなる。
なお、給湯側排気通路２８及び風呂側排気通路２９で発生したドレンは、前下がり傾斜する下側ケース２２の前方に凹設されて右下がり傾斜する凹部５５で受けられ、凹部５５の右側最深部に設けたドレン排出管５６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 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 45 to the rectifying plate. The air flows around the lower side of 46 and is discharged from the exhaust port 26 to the outside of the device.
Then, when the bath side is used alone, when the reheating of the bathtub is finished and the combustion of the second burner group 8 is stopped, the supply pressure from the air supply fan is lost, so that the bath stays in the bath side exhaust passage 29. The combustion gas flows into the hot water supply side exhaust passage 28 from the through holes 30, 30,... Of the partition plate 27 as shown by the dotted arrows in FIG. I do. Therefore, the temperature of the combustion gas decreases, and the temperature of the combustion gas is re-condensed in the casing 20 to easily generate drain.
The drain generated in the hot water supply side exhaust passage 28 and the bath side exhaust passage 29 is recessed in front of the lower case 22 sloping forward and is received by the recess 55 sloping rightward. Is discharged to a neutralizer (not shown) from a drain discharge pipe 56 provided at the bottom.

（二次熱交換器のケーシングによる効果）
このように、上記形態の二次熱交換器６及び風呂給湯器１によれば、ケーシング２０を、下面を開口して周面及び上面を閉塞した上側ケース２１と、上面を開口して周面及び下面を閉塞した下側ケース２２との２部品を組み付けて形成しているので、組立工程を低減することができる。また、上側ケース２１と下側ケース２２とは共に深底形状とならないため、分割形成される部品の加工も容易に行うことができる。
特にここでは、上側ケース２１と下側ケース２２とは、共に１枚の金属板を絞り加工して形成しているので、深い絞り加工を行う必要がなく、加工性に優れたものとなる。 (Effect of the casing of the secondary heat exchanger)
As described above, according to the secondary heat exchanger 6 and the bath water heater 1 of the above-described embodiment, the casing 20 is formed by opening the lower surface and closing the peripheral surface and the upper surface, and the upper case by opening the upper surface and the peripheral surface. Since the lower case 22 and the lower case 22 whose lower surface is closed are assembled and assembled, the number of assembling steps can be reduced. Further, since both the upper case 21 and the lower case 22 do not have a deep bottom shape, it is possible to easily process the parts formed separately.
In particular, in this case, since both the upper case 21 and the lower case 22 are formed by drawing one metal plate, there is no need to perform deep drawing, and the workability is excellent.

なお、ケーシングを構成する上側ケースと下側ケースとの構造は上記形態に限らず、上側ケースと下側ケースとの深さを上下逆にしたり、フランジ部の一部又は全部をなくして接合したり等、適宜変更できる。また、ケーシングの全体形状も、平面視矩形状に限らず、平面視正方形等の他の箱形形状であっても差し支えない。
さらに、上記形態では、上側ケースを、下面の開口を下にした向きで下側ケースに組み付けているが、上側ケースを上下逆にして開口を上にした状態で、閉塞側の面及びその周面を下側ケースの上面の開口に嵌合させて組み付けることもできる。この場合、下側ケースの開口際の内面に、嵌合した上側ケースの周面が上側ケースの深さ分で当接するため、シール性が向上する。 The structure of the upper case and the lower case constituting the casing is not limited to the above-described embodiment, and the upper case and the lower case may be inverted upside down, or may be joined without any or all of the flange portion. It can be changed as appropriate, for example. Also, the overall shape of the casing is not limited to a rectangular shape in a plan view, and may be another box shape such as a square in a plan view.
Furthermore, in the above embodiment, the upper case is assembled to the lower case with the opening on the lower surface facing down, but the upper case is turned upside down and the opening is turned up, and the closed surface and its periphery are closed. The surface can be fitted into the opening on the upper surface of the lower case and assembled. In this case, since the fitted peripheral surface of the upper case abuts on the inner surface of the lower case at the time of opening at the depth of the upper case, the sealing performance is improved.

（二次熱交換器の仕切板による効果）
このように、上記形態の二次熱交換器６及び風呂給湯器１によれば、仕切板２７に、各給湯側排気通路２８及び風呂側排気通路２９を通過する燃焼ガスが互いに隣接する風呂側排気通路２９及び給湯側排気通路２８側へ移動可能な通気部（透孔３０）を備えたことで、透孔３０を介して移動した給湯側排気通路２８又は風呂側排気通路２９内で燃焼ガスの雰囲気温度が下がり、ケーシング２０内でのドレンの発生が促進される。よって、燃焼中に吸熱管１６，１８へ付着した強酸性のドレンが燃焼停止後に気化して排気口２６から排出されることを効果的に抑制でき、ドレンが器具前面や周囲の建物の壁等に付着して腐食させるおそれを低減可能となる。
特にここでは、通気部を複数の透孔３０としているので、通気部が簡単に形成可能となる。 (Effect of the partition plate of the secondary heat exchanger)
As described above, according to the secondary heat exchanger 6 and the bath water heater 1 of the above-described embodiment, the combustion gas passing through each of the hot water supply-side exhaust passages 28 and the bath-side exhaust passages 29 is provided on the partition plate 27. By providing the ventilation portion (through hole 30) movable to the exhaust passage 29 and the hot water supply side exhaust passage 28, the combustion gas in the hot water supply side exhaust passage 28 or the bath side exhaust passage 29 moved through the through hole 30. , The generation of drain in the casing 20 is promoted. Therefore, it is possible to effectively suppress that the strongly acidic drain adhering to the heat absorption tubes 16 and 18 during the combustion is vaporized after the combustion is stopped and is discharged from the exhaust port 26, and the drain is discharged from the front of the appliance or a wall of a surrounding building or the like. It is possible to reduce the possibility of corrosion by adhering to the surface.
Particularly, here, since the ventilation portion is formed of the plurality of through holes 30, the ventilation portion can be easily formed.

なお、通気部の形状は円形の透孔に限らず、スリット状の透孔とする等、数や形状は上記形態に限定しない。仕切板へ設ける領域も上記形態に限らず、排気通路の全域に設けたり、上流側から下流側へ行くに従って透孔の開口面積を徐々に小さくしたり、逆に徐々に大きくしたり、大きさをランダムにしたり等、適宜変更可能である。   In addition, the shape and the shape of the ventilation section are not limited to the above-described embodiments, and are not limited to circular through-holes, and may be slit-like through-holes. The area provided on the partition plate is not limited to the above-described embodiment, but may be provided in the entire area of the exhaust passage, or the opening area of the through hole may be gradually reduced from the upstream side to the downstream side, or may be gradually increased. Can be changed as appropriate, for example, at random.

その他、上記形態では、給湯側と風呂側との２つの加熱部を有する複合給湯器となっているが、風呂側は暖房機器用の他の加熱部であってもよい。
但し、仕切板に係る発明については、潜熱回収用の熱交換器の両方の排気通路に吸熱管を設けて二次熱交換器を形成するものに限らず、何れか一方（例えば給湯側）の排気通路にのみ吸熱管を設けて二次熱交換器を形成する複合給湯器であっても、本発明は適用可能である。 In addition, in the above-described embodiment, the combined water heater has two heating units, a hot water supply side and a bath side. However, the bath side may be another heating unit for heating equipment.
However, the invention relating to the partition plate is not limited to one in which heat absorbing tubes are provided in both exhaust passages of the heat exchanger for latent heat recovery to form a secondary heat exchanger, but one of the heat exchangers (for example, the hot water supply side). The present invention can be applied to a combined water heater in which a secondary heat exchanger is formed by providing a heat absorbing tube only in the exhaust passage.

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、９・・バーナ、１１・・給湯側一次熱交換器、１２・・風呂側一次熱交換器、１３・・フィン、１４・・伝熱管、１５・・給湯側二次熱交換器、１６，１８・・吸熱管、１７・・風呂側二次熱交換器、２０・・ケーシング、２１・・上側ケース、２２・・下側ケース、２３・・上フランジ部、２４・・下フランジ部、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、３０・・透孔、３４・・給水管、３６・・接続管、３７・・出湯管、５２・・給湯側燃焼室、５３・・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. 2nd burner group, 9 burner, 11 hot water supply primary heat exchanger, 12 bath primary heat exchanger, 13 fins, 14 heat transfer tubes, 15 hot water supply two Secondary heat exchanger, 16, 18, heat-absorbing tube, 17 bath-side secondary heat exchanger, 20 casing, 21 upper case, 22 lower case, 23 upper flange, 24 ..Lower flange part, 25..inlet, 26..exhaust port, 27..partition plate, 28..hot water supply side exhaust passage, 29..bath side exhaust passage, 30..through hole, 34..water supply Pipes, 36, connecting pipes, 37, tapping pipes, 52, hot water supply side combustion chamber, 53, bath side combustion chamber.

Claims (3)

箱形のケーシング内に吸熱管を収容してなり、顕熱回収用の熱交換器を通過した燃焼ガスから潜熱を回収するために用いられる潜熱回収用の熱交換器であって、
前記ケーシングは、下面を開口して周面及び上面を閉塞した上側ケースと、上面を開口して周面及び下面を閉塞した下側ケースとの２部品を組み付けて形成されていることを特徴とする熱交換器。 A heat exchanger for latent heat recovery used to recover latent heat from combustion gas that has passed through a heat exchanger for sensible heat recovery, in which a heat absorbing tube is housed in a box-shaped casing,
The casing is formed by assembling two parts, an upper case having an open lower surface and closing a peripheral surface and an upper surface, and a lower case having an open upper surface and closing a peripheral surface and a lower surface. Heat exchanger. 前記上側ケースと前記下側ケースとは、共に１枚の金属板を絞り加工して形成されることを特徴とする請求項１に記載の熱交換器。   The heat exchanger according to claim 1, wherein both the upper case and the lower case are formed by drawing one metal plate. バーナと、前記バーナの燃焼ガスの流れの上流側に配置される顕熱回収用の熱交換器と、前記流れの下流側に配置される請求項１又は２に記載の潜熱回収用の熱交換器とを含んでなる給湯器。   The heat exchange for latent heat recovery according to claim 1 or 2, wherein the burner, a heat exchanger for sensible heat recovery arranged upstream of a flow of the combustion gas of the burner, and a heat exchanger arranged downstream of the flow. Water heater comprising a water heater.
JP2018111324A 2018-06-11 2018-06-11 Heat exchanger and hot water heater Pending JP2019215111A (en)

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Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013072569A (en) * 2011-09-27 2013-04-22 Paloma Co Ltd Water heater

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2013072569A (en) * 2011-09-27 2013-04-22 Paloma Co Ltd Water heater

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