JPH10160255A - Hot water feeder - Google Patents
Hot water feederInfo
- Publication number
- JPH10160255A JPH10160255A JP8330247A JP33024796A JPH10160255A JP H10160255 A JPH10160255 A JP H10160255A JP 8330247 A JP8330247 A JP 8330247A JP 33024796 A JP33024796 A JP 33024796A JP H10160255 A JPH10160255 A JP H10160255A
- Authority
- JP
- Japan
- Prior art keywords
- heat exchanger
- temperature side
- side heat
- combustion
- drain
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
- Details Of Fluid Heaters (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、給湯器の熱交換器に関
し、詳しくは２つの熱交換器を燃焼排ガス流路中に離間
して設け、燃焼排ガス中のドレン（凝縮水）を回収する
ドレン受けを備えた給湯器の熱交換器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat exchanger for a water heater, and more particularly, to a heat exchanger provided with two heat exchangers separated from each other in a flue gas passage to collect drain (condensed water) in the flue gas. The present invention relates to a heat exchanger of a water heater provided with a drain receiver.
【０００２】[0002]
【従来の技術】従来より、燃焼排ガス中の潜熱の回収を
図ることを目的として、燃焼排ガス流路中に熱交換器を
上下２段に離間して設けた給湯器が知られている。例え
ば、特開昭５４−６４７４７号公報に示されるように、
１次熱交換器と主熱交換器とを上下２段に離間して設
け、１次熱交換器と下方の主熱交換器との離間したスペ
ースにドレン受け皿を設けている。そして、上方の１次
熱交換器にて生じたドレン（潜熱回収後の凝縮水）は、
ドレン受け皿に受けられ、下方に設けた主熱交換器やガ
スバーナに滴下しないように給湯器外へ排出している。2. Description of the Related Art Conventionally, for the purpose of recovering latent heat in flue gas, there has been known a water heater in which a heat exchanger is provided in a flue gas passage at two vertically spaced positions. For example, as shown in JP-A-54-64747,
The primary heat exchanger and the main heat exchanger are separated from each other in two upper and lower stages, and a drain tray is provided in a space between the primary heat exchanger and the lower main heat exchanger. And the drain (condensed water after latent heat recovery) generated in the upper primary heat exchanger is
It is received by the drain pan and discharged outside the water heater so as not to drip onto the main heat exchanger and gas burner provided below.
【０００３】一方、熱交換器部では、燃焼排ガス中に含
まれる水蒸気の他、ＮＯX、ＳＯX、ＣＯ、ＣＯ2によっ
て、腐食性の強いＨＮＯ3等の酸が生成されて凝縮さ
れ、熱交換器の銅母材や表面処理材である鉛材を腐食す
る。その結果、炭酸鉛、硝酸鉛、塩基性炭酸鉛、硫酸銅
（緑青）等の腐食生成物が多量に生じて、熱交換器のフ
ィン間に堆積し、燃焼排ガス流路の排気抵抗が増大して
不完全燃焼を引き起こしたり、熱交率を著しく低下する
と共に、剥離して飛散したり、更に腐食が進むと熱交換
器に穴があく等の問題を生じていた。そこで、例えば、
特開昭６０−１６４１６８号公報に示されるように、熱
交換器部材の表面に耐酸性、耐熱性、熱伝導性に優れた
Ａｌ2Ｏ3、ＳｉＣ等の無機質粉末のコーティング層を形
成することによって、腐食を防止することが提案されて
いる。On the other hand, in the heat exchanger section, in addition to steam contained in the flue gas, acids such as HNO 3 which are highly corrosive are generated and condensed by NO x , SO x , CO and CO 2 , and are condensed. Corrodes the copper base material of the exchanger and the lead material which is a surface treatment material. As a result, a large amount of corrosion products such as lead carbonate, lead nitrate, basic lead carbonate, and copper sulfate (green-blue) are generated and deposited between the fins of the heat exchanger, thereby increasing the exhaust resistance of the flue gas passage. This causes problems such as causing incomplete combustion, remarkably lowering the heat exchange rate, peeling and scattering, and further corrosion leading to holes in the heat exchanger. So, for example,
As disclosed in JP-A-60-164168, a coating layer of an inorganic powder such as Al 2 O 3 or SiC having excellent acid resistance, heat resistance and heat conductivity is formed on the surface of a heat exchanger member. It has been proposed to prevent corrosion.
【０００４】[0004]
【発明が解決しようとする課題】しかしながら、前述の
熱交換器を上下２段に離間して設けた給湯器において
は、バーナから上段の熱交換器までの高さが大きくなる
ため、給湯器のコンパクト化が難しい問題があった。ま
た、上段の熱交換器と下段の熱交換器との間にドレン受
け板を設けて、凝縮したドレンが下段の熱交換器へ滴下
しないように、ドレン排水口へ導かれるものの、上段の
熱交換器部では、凝縮されたドレンによって腐食生成物
が多量に生じて耐久性が劣る問題があった。また、この
腐食対策として、熱交換器に無機質粉末のコーティング
層を形成する場合には、そもそも熱交換器のフィン間隙
が狭いために、吹き付けまたは侵積によるコーティング
が難しく、その結果、給湯器を安価に製作できない問題
が生じていた。更に、高温時に軟化、溶融するガラスフ
リットをコーティング材に混ぜて母材金属との接着効果
をある程度もたせることができるものの、熱交換器材で
ある銅とコーティング層である無機質との熱膨張係数が
異なるために、温度によっては加熱・冷却の繰り返しに
よって、コーティング層と母材金属との密着性が低下
し、耐久性が劣る問題があった。そこで、本発明の給湯
器は上記課題を解決し、高効率で耐久性があり、かつ、
コンパクトな給湯器を提供することを目的とする。However, in a water heater in which the above-mentioned heat exchanger is provided in two stages vertically separated from each other, the height from the burner to the upper heat exchanger becomes large. There was a problem that was difficult to make compact. In addition, a drain receiving plate is provided between the upper and lower heat exchangers, and the condensed drain is guided to the drain outlet so that the condensed drain does not drop to the lower heat exchanger. In the exchanger part, a large amount of corrosion products are generated due to the condensed drain, and there is a problem that durability is poor. As a countermeasure against this corrosion, when forming a coating layer of inorganic powder on a heat exchanger, the fin gap of the heat exchanger is narrow in the first place, so coating by spraying or erosion is difficult. There has been a problem that it cannot be manufactured at low cost. Furthermore, although a glass frit that softens and melts at high temperatures can be mixed with the coating material to provide a certain degree of adhesive effect with the base metal, the coefficient of thermal expansion between copper as the heat exchanger material and the inorganic material as the coating layer is different. For this reason, depending on the temperature, the adhesion between the coating layer and the base metal decreases due to the repetition of heating and cooling. Therefore, the water heater of the present invention solves the above problems, has high efficiency and durability, and
An object is to provide a compact water heater.
【０００５】[0005]
【課題を解決するための手段】上記課題を解決する本発
明の請求項１記載の給湯器は、燃料ガスを燃焼するバー
ナと、上記バーナによる燃焼熱により通水中の水を加熱
する複数の伝熱フィンをもった高温側熱交換器と、上記
高温側熱交換器が設けられた燃焼排ガス流路の下流に設
けられ、燃焼熱により通水中の水を加熱する複数の伝熱
フィンをもった低温側熱交換器と、上記低温側熱交換器
から発生するドレンを受けて所要部へ排出するドレン受
けとを備えた給湯器において、上記高温側熱交換器、上
記低温側熱交換器および上記ドレン受けをセラミックス
で成形すると共に、上記バーナの燃焼炎内に上記高温側
熱交換器を配設したことを要旨とする。According to a first aspect of the present invention, there is provided a water heater, comprising: a burner for burning fuel gas; and a plurality of transmission units for heating water in the flowing water by the heat of combustion by the burner. A high-temperature side heat exchanger having heat fins, and a plurality of heat transfer fins provided downstream of the flue gas flow passage provided with the high-temperature side heat exchanger and heating the water in the water by combustion heat. In a water heater comprising a low-temperature side heat exchanger and a drain receiver which receives drain generated from the low-temperature side heat exchanger and discharges the drain to a required portion, the high-temperature side heat exchanger, the low-temperature side heat exchanger, and the The gist of the present invention is that the drain receiver is formed of ceramics and the high-temperature side heat exchanger is disposed in the combustion flame of the burner.
【０００６】上記課題を解決する本発明の請求項２記載
の給湯器は、上記バーナを含めて、セラミックスで成形
したことを要旨とする。The gist of the present invention to solve the above-mentioned problem is that the water heater including the burner is formed of ceramics.
【０００７】上記構成を有する本発明の請求項１記載の
給湯器は、燃焼排ガス流路の上流から高温側熱交換器と
低温側熱交換器とが設けられて、バーナによる燃焼熱に
より通水中の水を加熱するので、高温側熱交換器で燃焼
熱を熱交換することに加えて、低温側熱交換器で潜熱を
回収でき、熱効率が向上する。また、高温側熱交換器、
低温側熱交換器およびドレン受けをセラミックスで成形
すると共に、高温側熱交換器をバーナの燃焼炎内に配設
することにより、ドレンによる腐食生成物が発生しない
ので耐久性が向上する。更に、バーナから高温側熱交換
器までの燃焼室の高さを低くでき、給湯器をコンパクト
にすることができる。In the water heater according to the first aspect of the present invention having the above-mentioned structure, a high-temperature heat exchanger and a low-temperature heat exchanger are provided from the upstream of the flue gas flow passage, and water is supplied by combustion heat from the burner. Since the water is heated, in addition to the heat exchange of the combustion heat by the high-temperature side heat exchanger, the latent heat can be recovered by the low-temperature side heat exchanger, and the heat efficiency is improved. Also, the high temperature side heat exchanger,
By forming the low-temperature side heat exchanger and the drain receiver with ceramics and arranging the high-temperature side heat exchanger in the combustion flame of the burner, corrosion products due to the drain are not generated, so that the durability is improved. Further, the height of the combustion chamber from the burner to the high-temperature side heat exchanger can be reduced, and the water heater can be made compact.
【０００８】また、上記構成を有する本発明の請求項２
記載の給湯器は、高温側熱交換器、低温側熱交換器およ
びドレン受けの他、バーナがセラミックスで成形され
る。従って、ドレンが壁面をつたってバーナに流れる等
の事態になっても、バーナでドレンによる腐食生成物が
発生しないので耐久性が向上する。[0008] Further, the present invention has the above-mentioned structure.
In the water heater described, the burner is formed of ceramics in addition to the high-temperature side heat exchanger, the low-temperature side heat exchanger and the drain receiver. Therefore, even if the drain flows along the wall surface to the burner, the burner does not generate corrosion products due to the drain, so that the durability is improved.
【０００９】[0009]
【発明の実施形態】以上説明した本発明の構成・作用を
一層明らかにするために、以下本発明の給湯器の好適な
実施例について説明する。図１は一実施例としての給湯
器の概略図である。給湯器は、燃焼用空気を燃焼室９へ
送り込むファン１１、燃料ガスを燃焼するバーナ１０、
燃焼熱により通水路内の水に熱交換する高温側熱交換器
８、この高温側熱交換器８とバーナ１０間にはさまれ燃
焼空間を形成する燃焼室９、高温側熱交換器８の上方で
燃焼排ガス中の燃焼熱を熱交換する低温側熱交換器７、
高温側熱交換器８と低温側熱交換器７間でドレン回収空
間を形成するドレン回収室５、低温側熱交換器７の上方
で排気を導き排出する排気筒１から燃焼・給排気経路が
構成されている。尚、バーナ１０は、全一次空気式であ
って、燃焼面に燃料ガスと空気との混合ガスを噴出する
多数の噴出孔が開けられる。また、バーナ１０へのガス
供給経路２７には、ガス量を制御するガス比例弁１７、
ガス通路を開閉するガス電磁弁１５、１６が設けられて
いる。また、給水経路は、給水路２５から低温側熱交換
器７、この下方の高温側熱交換器８を経て、給湯路２６
に設ける給湯カラン２４へ通じている。また、バーナ１
０には、図示しない点火用電極、燃焼炎を検知するフレ
ームロッドを設け、ガス電磁弁１５、１６、ガス比例弁
１７と共にコントローラ１８へ電気的に接続され、出湯
・運転・停止等の所定の制御が行われている。BEST MODE FOR CARRYING OUT THE INVENTION In order to further clarify the configuration and operation of the present invention described above, a preferred embodiment of the water heater of the present invention will be described below. FIG. 1 is a schematic diagram of a water heater as one embodiment. The water heater includes a fan 11 for feeding combustion air into the combustion chamber 9, a burner 10 for burning fuel gas,
A high-temperature heat exchanger 8 for exchanging heat with water in the water passage by combustion heat, a combustion chamber 9 sandwiched between the high-temperature heat exchanger 8 and the burner 10 to form a combustion space, and a high-temperature heat exchanger 8 A low-temperature side heat exchanger 7 for exchanging heat of combustion in flue gas at the upper part;
A combustion / supply / exhaust passage extends from a drain recovery chamber 5 forming a drain recovery space between the high-temperature side heat exchanger 8 and the low-temperature side heat exchanger 7, and an exhaust pipe 1 for guiding and discharging exhaust gas above the low-temperature side heat exchanger 7. It is configured. The burner 10 is of an all-primary air type, and has a large number of ejection holes for ejecting a mixed gas of fuel gas and air on a combustion surface. The gas supply path 27 to the burner 10 includes a gas proportional valve 17 for controlling a gas amount,
Gas solenoid valves 15 and 16 for opening and closing gas passages are provided. In addition, the water supply path passes from the water supply path 25 to the low-temperature side heat exchanger 7, through the high-temperature side heat exchanger 8 below the same, and
In the hot water supply curan 24 provided in the water heater. Burner 1
0 is provided with an ignition electrode (not shown) and a flame rod for detecting a combustion flame, and is electrically connected to a controller 18 together with the gas solenoid valves 15 and 16 and a gas proportional valve 17 so as to perform predetermined operations such as tapping, operation and stop. Control is being performed.
【００１０】高温側熱交換器８および低温側熱交換器７
のそれぞれは、互いに間隙をもって向い合う複数の伝熱
フィン２０、２１と、これらの伝熱フィン２０、２１を
挿通する複数の伝熱管２２、２３とで形成されている。
そして、伝熱管２２、２３内の通水が配列された複数の
伝熱フィン２０、２１を蛇行して流れるように、熱交換
器壁の外でこれらの伝熱管２２、２３が連結され、流路
が連通している。High-temperature heat exchanger 8 and low-temperature heat exchanger 7
Are formed by a plurality of heat transfer fins 20 and 21 facing each other with a gap therebetween, and a plurality of heat transfer tubes 22 and 23 passing through the heat transfer fins 20 and 21.
These heat transfer tubes 22 and 23 are connected outside the heat exchanger wall so that water in the heat transfer tubes 22 and 23 flows in a meandering manner on the arranged plurality of heat transfer fins 20 and 21. The road is in communication.
【００１１】また、低温側熱交換器７が温度低下した燃
焼排ガスから潜熱を効率よく熱交換できるようにするた
め、および、燃焼炎が高温側熱交換器８の各伝熱フィン
間で高温を保って燃焼できるようにするため、通水は、
まず低温側熱交換器７で熱交換され、次いで高温側熱交
換器８で熱交換されるように、上下の熱交換器８、７が
接続管３で接続される。Also, in order to enable the low-temperature side heat exchanger 7 to efficiently exchange latent heat from the combustion exhaust gas whose temperature has decreased, and that the combustion flame reduces the high temperature between the heat transfer fins of the high-temperature side heat exchanger 8. In order to maintain and burn,
The upper and lower heat exchangers 8 and 7 are connected by the connecting pipe 3 so that heat is firstly exchanged in the low-temperature side heat exchanger 7 and then exchanged in the high-temperature side heat exchanger 8.
【００１２】低温側熱交換器７の下方に位置するドレン
回収室５には、図２に示すように、低温側熱交換器７か
ら滴下するドレンを受ける断面コの字形のドレン受け４
が上に開口して設けられ、ドレン回収室５の一方の側壁
には、ドレン受け４で受けたドレンを集合するドレン集
合部６が設けられる。ドレン受け４は、排気間隙を設け
て複数個、上下２段に互い違いに設けられ、ドレン集合
部６へ向けて水平方向に傾斜して配列される。また、各
々のドレン受け４とドレン受け４との間は、燃焼排ガス
が各々のドレン受け４を迂回して通過するように燃焼排
ガス流路を形成する。また、ドレン受け４は、ドレンを
受けてドレンを導くばかりでなく、燃焼排ガス流の分布
を均等化する役目も果たす。As shown in FIG. 2, a drain receiver 4 having a U-shaped cross section for receiving drain dripping from the low-temperature side heat exchanger 7 is provided in the drain recovery chamber 5 located below the low-temperature side heat exchanger 7.
The drain collecting chamber 5 is provided with a drain collecting part 6 for collecting the drain received by the drain receiver 4 on one side wall of the drain collecting chamber 5. A plurality of drain receivers 4 are provided alternately in two upper and lower stages with an exhaust gap, and are arranged to be inclined in the horizontal direction toward the drain collecting part 6. Further, between each drain receiver 4, a combustion exhaust gas flow path is formed so that the combustion exhaust gas bypasses each drain receiver 4 and passes therethrough. The drain receiver 4 not only receives the drain and guides the drain, but also plays a role of equalizing the distribution of the flue gas flow.
【００１３】ドレンが導かれるドレン集合部６には、ド
レンを排出するドレン排水管１３がＵ字形またはＺ形に
設けられ、屈曲した溜部に溜まったドレンによって、ド
レン回収室５と外気とを遮断し、排気通路内の燃焼排ガ
スがドレン排水管１３から器外へ洩れるのを防止してい
る。尚、ドレンが溜まる溜部の高さｈは、ファン１１の
最高静圧より若干大きく設定されている。A drain drain pipe 13 for draining the drain is provided in the drain collecting section 6 in a U-shape or a Z-shape. The drain collected in the bent storage section allows the drain recovery chamber 5 to communicate with the outside air. It shuts off and prevents the combustion exhaust gas in the exhaust passage from leaking from the drain drain pipe 13 to the outside. The height h of the reservoir where the drain accumulates is set slightly larger than the maximum static pressure of the fan 11.
【００１４】低温側熱交換器７、ドレン回収室５、複数
のドレン受４、高温側熱交換器８、燃焼室９、バーナ１
０、およびこれら周囲壁面の材料は、比較的、熱伝導効
率の高いＳｉＣ（炭化珪素）（またはセラミックスと読
み代えても良い）で形成され、これら全体は一体に焼成
して作製される。A low-temperature heat exchanger 7, a drain recovery chamber 5, a plurality of drain receivers 4, a high-temperature heat exchanger 8, a combustion chamber 9, and a burner 1
0 and the material of these peripheral wall surfaces are made of SiC (silicon carbide) (or may be read as ceramics) having a relatively high heat conduction efficiency, and the whole thereof is manufactured by firing integrally.
【００１５】従来、銅製のフィンチューブ型熱交換器で
は、高温時の酸化による腐食を防止して耐久性を確保す
るために、伝熱フィンの温度を１５０〜２５０℃に低く
しなければならず、また、燃焼炎が熱交換器の伝熱フィ
ンに接触し、燃焼炎が冷却されて不完全燃焼を起こさな
いように、バーナ１０から高温熱交換器８までの燃焼室
９高さが大きく設けられていた。一方、本実施例では、
バーナ１０および高温熱交換器８をＳｉＣ材料で形成す
るために、耐熱性をもたせることができると共に、銅材
のように高温酸化が起こらない。従って、燃焼室９およ
び高温側熱交換器８を高温化（５００〜６００℃）する
ことができるため、燃焼炎を積極的に伝熱フィン２１へ
接触させ、伝熱フィン２１と伝熱フィン２１との間隙で
燃焼するように、燃焼室９高さを低く設ける。Conventionally, in a fin tube type heat exchanger made of copper, the temperature of the heat transfer fins must be lowered to 150 to 250 ° C. in order to prevent corrosion due to oxidation at a high temperature and secure durability. Also, the height of the combustion chamber 9 from the burner 10 to the high-temperature heat exchanger 8 is set large so that the combustion flame does not contact the heat transfer fins of the heat exchanger and the combustion flame is cooled to cause incomplete combustion. Had been. On the other hand, in this embodiment,
Since the burner 10 and the high-temperature heat exchanger 8 are made of a SiC material, the burner 10 and the high-temperature heat exchanger 8 can have heat resistance and do not undergo high-temperature oxidation unlike a copper material. Therefore, since the temperature of the combustion chamber 9 and the high-temperature side heat exchanger 8 can be increased (500 to 600 ° C.), the combustion flame is positively brought into contact with the heat transfer fins 21 and the heat transfer fins 21 and the heat transfer fins 21 are heated. The height of the combustion chamber 9 is set low so that combustion takes place in the gap between the first and second combustion chambers.
【００１６】次に、給湯器の燃焼動作について、以下に
説明する。まず、給湯カラン２４を開いて給水路２５へ
給水されると、コントローラ１８からファン１１へ指令
信号が送られ、ファン１１が回転する。次にコントロー
ラ１８からの指令信号によりガス電磁弁１５、１６を開
弁してバーナ１０に燃料ガスが供給され、図示しないイ
グナイタの放電によって燃料ガスに点火され、燃焼が開
始される。Next, the combustion operation of the water heater will be described below. First, when the hot water supply currant 24 is opened and water is supplied to the water supply passage 25, a command signal is sent from the controller 18 to the fan 11, and the fan 11 rotates. Next, the gas solenoid valves 15 and 16 are opened by a command signal from the controller 18 to supply fuel gas to the burner 10, and the fuel gas is ignited by the discharge of an igniter (not shown) to start combustion.
【００１７】この点火初期には、高温側熱交換器８が高
温になる前に、燃焼炎が伝熱フィン２１に接触して冷却
されると、不完全燃焼を起こす場合がある。そこで、点
火初期には、高温側熱交換器８が冷えた状態となってい
るために、コントローラ１８が、ガス比例弁１７の開度
を小さくして燃料ガス量を絞り、燃焼炎が高温熱交換器
８に達しないように、燃焼を制御する。そして、点火後
から所定時間経過後に、高温側熱交換器８が赤熱し、燃
焼炎が伝熱フィン２１に接触しても不完全燃焼を起こさ
ない状態になり、コントローラ１８は、ガス比例弁１７
の開度を大きくして燃料ガス量を増す。この際の燃焼炎
は、高温側熱交換器８の各伝熱フィン２１の間隙に入り
込んで燃焼する。図２は、伝熱フィン２１間で燃焼する
この燃焼炎３３を示している。In the early stage of the ignition, if the combustion flame is cooled by contacting the heat transfer fins 21 before the high temperature side heat exchanger 8 becomes high in temperature, incomplete combustion may occur. Therefore, since the high-temperature side heat exchanger 8 is in a cold state at the initial stage of ignition, the controller 18 reduces the opening of the gas proportional valve 17 to reduce the amount of fuel gas, and the combustion flame is heated to a high temperature. The combustion is controlled so as not to reach the exchanger 8. Then, after a lapse of a predetermined time from the ignition, the high-temperature side heat exchanger 8 glows red, and the combustion flame does not cause incomplete combustion even when contacting the heat transfer fins 21.
To increase the amount of fuel gas. The combustion flame at this time enters the gap between the heat transfer fins 21 of the high-temperature side heat exchanger 8 and burns. FIG. 2 shows this combustion flame 33 burning between the heat transfer fins 21.
【００１８】バーナ１０から噴出する燃料ガスは、高温
側熱交換器８の各伝熱フィン２１の間隙での燃焼後、こ
の燃焼排ガスが上方のドレン受４間の間隙を通過し、上
方の低温側熱交換器７の伝熱フィン２０を接触通過す
る。従って、高温側熱交換器８の伝熱フィン２１は燃焼
炎に接触して伝熱されると共に、上方の低温側熱交換器
７は燃焼排ガスの残余熱を効率良く吸収して、これらの
伝熱管２２内を通過する通水を加熱昇温する。After the fuel gas ejected from the burner 10 burns in the gap between the heat transfer fins 21 of the high-temperature side heat exchanger 8, this combustion exhaust gas passes through the gap between the upper drain receivers 4 and the lower It passes through the heat transfer fins 20 of the side heat exchanger 7. Therefore, the heat transfer fins 21 of the high-temperature side heat exchanger 8 come into contact with the combustion flame and are transferred, and the upper low-temperature side heat exchanger 7 efficiently absorbs the residual heat of the combustion exhaust gas, and these heat transfer tubes The water passing through the inside 22 is heated and heated.
【００１９】一方、燃焼排ガスは、下方の高温側熱交換
器８で熱交換されて排気温度が低下し、更に上方の低温
側熱交換器７で潜熱が回収されて排気温度が低下する。
そして、低温側熱交換器７を通過する際に、低温となっ
た燃焼排ガスから凝縮するドレンは、ドレン受４に滴下
し、ドレン受４に沿ってドレン集合部６へ導かれる。従
って、ドレンは、下方の高温側熱交換器８およびバーナ
１０上への滴下が妨げられる。On the other hand, the flue gas is heat-exchanged in the lower high-temperature heat exchanger 8 to lower the exhaust gas temperature, and latent heat is recovered in the upper low-temperature heat exchanger 7 to lower the exhaust gas temperature.
Then, when passing through the low-temperature side heat exchanger 7, the drain condensed from the combustion exhaust gas having a low temperature drops into the drain receiver 4 and is guided to the drain collecting part 6 along the drain receiver 4. Therefore, the drain is prevented from dropping onto the high temperature side heat exchanger 8 and the burner 10 below.
【００２０】以上のことから、高温側熱交換器８で燃焼
熱を熱交換し、更に、上方の低温側熱交換器７で燃焼排
ガス中の潜熱を回収するので熱効率が著しく向上する。
また、高温側熱交換器８が、バーナ１０の燃焼炎内に配
設できるため、バーナ１０上端から高温側熱交換器８下
端までの燃焼室９高さを低くすることができ、給湯器を
コンパクトにすることができる。また、ドレン回収は確
実に行われると共に、高温側熱交換器８、ドレン受け
４、低温側熱交換器７、およびバーナ１０は腐食しない
材料であるＳｉＣで作製され、ドレンによる腐食生成物
が発生しないので耐久性が向上する。また、これらの四
方を囲む壁面がＳｉＣで作製され、壁面に沿ってドレン
が流れても壁面が腐食して孔ができ、燃焼排ガスが洩れ
るという問題を生じない。また、バーナ１０から低温側
熱交換器７までが一体に成形されるので、気密を保ち易
くなり、燃焼排ガスが器体外に洩れるおそれがない。From the above, the combustion heat is exchanged in the high-temperature side heat exchanger 8, and the latent heat in the combustion exhaust gas is recovered in the upper low-temperature heat exchanger 7, so that the heat efficiency is remarkably improved.
Further, since the high-temperature side heat exchanger 8 can be disposed inside the combustion flame of the burner 10, the height of the combustion chamber 9 from the upper end of the burner 10 to the lower end of the high-temperature side heat exchanger 8 can be reduced, and the water heater can be provided. It can be compact. In addition, the drain is reliably collected, and the high-temperature side heat exchanger 8, the drain receiver 4, the low-temperature side heat exchanger 7, and the burner 10 are made of a non-corrosive material, SiC. Not so, the durability is improved. Further, the wall surface surrounding these four sides is made of SiC, and even if drain flows along the wall surface, the wall surface is corroded to form a hole, and there is no problem that the combustion exhaust gas leaks. Further, since the components from the burner 10 to the low-temperature side heat exchanger 7 are integrally formed, airtightness is easily maintained, and there is no possibility that the combustion exhaust gas leaks out of the body.
【００２１】以上、本発明の実施例について説明した
が、本発明はこうした実施例に何等限定されるものでは
なく、本発明の趣旨を逸脱しない範囲において、種々な
る態様で実施し得ることは勿論である。例えば、本実施
例では、バーナ１０、燃焼室９、高温側熱交換器８、ド
レン回収室５、ドレン受け４、及び低温側熱交換器７の
全体をＳｉＣで一体に焼成して形成する構成として説明
したが、図３に示すように各々のブロックに分けてＳｉ
Ｃで作製し、各ブロックの上下端部が互いにかみ合う段
差部２８ａ、２８ｂを形成し、これらを一体的に組合わ
せる構成であっても良い。この場合には、ＳｉＣの溶接
ができる特性を利用し、燃焼排ガスが洩れないように、
各ブロックを溶接によって一体的に構成しても良い。あ
るいは、各ブロックにおける嵌合の接合面に、耐熱性の
ある接着剤等を塗布しても良く、または、耐熱性のある
バッキンを装着することによって気密を保っても良い。
尚、各部をブロックに分けた場合には、成形が容易で安
価に作製できるメリットを生じる。Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments at all, and it is needless to say that the present invention can be implemented in various modes without departing from the gist of the present invention. It is. For example, in the present embodiment, the burner 10, the combustion chamber 9, the high-temperature side heat exchanger 8, the drain recovery chamber 5, the drain receiver 4, and the low-temperature side heat exchanger 7 are integrally fired and formed with SiC. However, as shown in FIG.
C, the upper and lower ends of each block may be formed with step portions 28a and 28b that engage with each other, and these may be integrally combined. In this case, utilizing the characteristic that SiC can be welded, so that the combustion exhaust gas does not leak,
Each block may be integrally formed by welding. Alternatively, a heat-resistant adhesive or the like may be applied to the mating joint surface of each block, or airtightness may be maintained by mounting a heat-resistant backing.
In addition, when each part is divided into blocks, there is an advantage that molding can be performed easily and inexpensively.
【００２２】また、ＳｉＣで一体または一体的に形成す
るのは、これら各部の構成に限定されず、ドレン集合部
６、および燃料ガスの混合室等を加える構成であっても
良い。また、ＳｉＣは、「炭化珪素」、または「セラミ
ックス」と呼び代えても良い。In addition, the structure formed integrally or integrally with SiC is not limited to the structure of each part, but may be a structure in which the drain collecting part 6, a fuel gas mixing chamber, and the like are added. Further, SiC may be called “silicon carbide” or “ceramics”.
【００２３】また、高温側熱交換器８の上方に低温側熱
交換器７を設ける構成として説明したが、燃焼排ガスが
通過する流路において、高温側熱交換器８の下流流路を
直角方向に曲げたり、流路を逆Ｕ字形に下方方向に曲げ
て、この下流に低温側熱交換器７を設定する構成であっ
ても良い。また、この構成によって、ドレンを導くドレ
ン受け４は、低温側熱交換器７と高温側熱交換器８との
間に設けられる構成に限定されず、低温側熱交換器７で
発生して流れる落ちるドレンの方向に応じて、燃焼排ガ
ス流路の下流に設ける構成であっても良い。この場合
に、高温側熱交換器８からの下流の燃焼排ガス流路が直
角方向に曲げられ、燃焼排ガス流路下面壁がドレン受け
４を兼ねて下り勾配に設けられ、ドレンを流路に沿って
器体外に排出する構成となっても良い。Although the low-temperature heat exchanger 7 has been described as being provided above the high-temperature heat exchanger 8, the flow path through which the combustion exhaust gas passes passes through the downstream flow path of the high-temperature heat exchanger 8 in a right angle direction. Or the flow path may be bent downward in an inverted U-shape, and the low-temperature side heat exchanger 7 may be set downstream of this. Further, with this configuration, the drain receiver 4 that guides the drain is not limited to the configuration provided between the low-temperature side heat exchanger 7 and the high-temperature side heat exchanger 8, and is generated and flows in the low-temperature side heat exchanger 7. A configuration may be provided downstream of the flue gas flow path in accordance with the direction of the drain that falls. In this case, the flue gas flow path downstream from the high-temperature side heat exchanger 8 is bent in a right angle direction, and the bottom wall of the flue gas flow path is provided with the drain receiver 4 so as to have a downward slope. It may be configured to be discharged out of the body.
【００２４】[0024]
【発明の効果】以上詳述したように、本発明の請求項１
記載の給湯器によれば、ドレンによる腐食生成物が発生
しないので耐久性が向上すると共に、潜熱を回収できる
ので熱効率が向上する。また、燃焼室高さを低くできる
ので給湯器をコンパクトにすることができるという優れ
た効果を奏する。また、請求項２記載の給湯器によれ
ば、請求項１による効果に加え、バーナがセラミックス
で作製されるので、バーナの耐久性を向上させることが
できる。As described in detail above, claim 1 of the present invention
According to the water heater described above, since corrosion products due to drainage are not generated, durability is improved, and latent heat can be recovered, so that thermal efficiency is improved. Further, since the height of the combustion chamber can be reduced, there is an excellent effect that the water heater can be made compact. According to the water heater of the second aspect, in addition to the effect of the first aspect, since the burner is made of ceramics, the durability of the burner can be improved.
【図１】本発明の実施例に係る給湯器の概略図（正面
図）である。FIG. 1 is a schematic view (front view) of a water heater according to an embodiment of the present invention.
【図２】本発明の実施例に係る給湯器の概略図（側面
図）である。FIG. 2 is a schematic view (side view) of the water heater according to the embodiment of the present invention.
【図３】本発明の他の実施例に係る概略図である。FIG. 3 is a schematic view according to another embodiment of the present invention.
４ ドレン受け ５ ドレン回収室 ６ ドレン集合部 ７ 低温側熱交換器 ８ 高温側熱交換器 ９ 燃焼室 １０ バーナ １１ ファン １３ ドレン排水管 １８ コントローラ ２４ 給湯カラン ２５ 給水路 ２６ 給湯路 ２７ ガス通路 Reference Signs List 4 Drain receiver 5 Drain recovery chamber 6 Drain collecting part 7 Low temperature side heat exchanger 8 High temperature side heat exchanger 9 Combustion chamber 10 Burner 11 Fan 13 Drain drainage pipe 18 Controller 24 Hot water supply curran 25 Water supply path 26 Hot water supply path 27 Gas passage
Claims (2)
数の伝熱フィンをもった高温側熱交換器と、 上記高温側熱交換器が設けられた燃焼排ガス流路の下流
に設けられ、燃焼熱により通水中の水を加熱する複数の
伝熱フィンをもった低温側熱交換器と、 上記低温側熱交換器から発生するドレンを受けて所要部
へ排出するドレン受けとを備えた給湯器において、 上記高温側熱交換器、上記低温側熱交換器および上記ド
レン受けをセラミックスで成形すると共に、 上記バーナの燃焼炎内に上記高温側熱交換器を配設した
ことを特徴とする給湯器。1. A high temperature side heat exchanger having a burner for burning fuel gas, a plurality of heat transfer fins for heating water in the water flow by the heat of combustion by the burner, and the high temperature side heat exchanger. A low-temperature side heat exchanger provided with a plurality of heat transfer fins provided downstream of the combustion exhaust gas flow path and heating water passing through by combustion heat, and receiving a drain generated from the low-temperature side heat exchanger. A water heater provided with a drain receiver that discharges the heat to the hot-side heat exchanger, the low-temperature heat exchanger, and the drain receiver. A water heater characterized by having a water heater.
形したことを特徴とする請求項１記載の給湯器。2. The water heater according to claim 1, wherein the water heater is formed of ceramics including the burner.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33024796A JP3724672B2 (en) | 1996-11-25 | 1996-11-25 | Water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33024796A JP3724672B2 (en) | 1996-11-25 | 1996-11-25 | Water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH10160255A true JPH10160255A (en) | 1998-06-19 |
| JP3724672B2 JP3724672B2 (en) | 2005-12-07 |
Family
ID=18230509
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33024796A Expired - Fee Related JP3724672B2 (en) | 1996-11-25 | 1996-11-25 | Water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3724672B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015025580A (en) * | 2013-07-24 | 2015-02-05 | 三菱重工業株式会社 | Exhaust gas latent heat recovery device |
-
1996
- 1996-11-25 JP JP33024796A patent/JP3724672B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2015025580A (en) * | 2013-07-24 | 2015-02-05 | 三菱重工業株式会社 | Exhaust gas latent heat recovery device |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3724672B2 (en) | 2005-12-07 |
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