JP2002098413A - Hot water supply apparatus - Google Patents
Hot water supply apparatusInfo
- Publication number
- JP2002098413A JP2002098413A JP2000291529A JP2000291529A JP2002098413A JP 2002098413 A JP2002098413 A JP 2002098413A JP 2000291529 A JP2000291529 A JP 2000291529A JP 2000291529 A JP2000291529 A JP 2000291529A JP 2002098413 A JP2002098413 A JP 2002098413A
- Authority
- JP
- Japan
- Prior art keywords
- drain
- heat exchanger
- evaporator
- sub
- heat
- 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、燃焼排気により通水を
加熱する熱交換器を備えた給湯器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water heater provided with a heat exchanger for heating water through combustion exhaust gas.
【０００２】[0002]
【従来の技術】従来から給湯器は、給水管および出湯管
が接続される熱交換器と、この熱交換器を加熱するバー
ナと、バーナに燃焼用空気を供給するファンとを備え、
バーナの燃焼により熱交換器で通水を加熱し、出湯管よ
り出湯する強制燃焼式給湯器が一般的に知られている。
こうした給湯器の中には、熱効率を向上するために、バ
ーナから発生した燃焼排気中の水蒸気を凝縮させて、そ
の潜熱と顕熱とを熱交換器で回収する潜熱回収型給湯器
がある。2. Description of the Related Art Conventionally, a water heater has a heat exchanger to which a water supply pipe and a tapping pipe are connected, a burner for heating the heat exchanger, and a fan for supplying combustion air to the burner.
2. Description of the Related Art There is generally known a forced combustion type water heater in which water is heated by a heat exchanger by combustion of a burner, and the hot water is supplied from a hot water pipe.
Among such water heaters, there is a latent heat recovery type water heater that condenses water vapor in combustion exhaust gas generated from a burner and recovers its latent heat and sensible heat with a heat exchanger in order to improve thermal efficiency.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、凝縮し
たドレンが燃焼排気中の硫黄酸化物（ＳＯｘ）や窒素酸
化物（ＮＯｘ）と反応して酸性になるため、こうした潜
熱回収型給湯器では、中和処理をしなければならず、コ
ストが非常に高かった。また、発生した酸性ドレンによ
り熱交換器が腐食しやすく、その耐久性が悪かった。However, since the condensed drain reacts with sulfur oxides (SOx) and nitrogen oxides (NOx) in the combustion exhaust to become acidic, such a latent heat recovery type water heater has a medium. The sum processing had to be performed, and the cost was very high. Further, the heat exchanger was easily corroded by the generated acidic drain, and its durability was poor.
【０００４】一方、給湯器には中和装置の不要な顕熱回
収型もあるが、ドレンを全く発生させないようにするた
め、燃焼排気の温度を大幅に低下させることができず、
余裕分も考慮すると、熱交換器全体の熱効率は６８％程
度にしかならなかった。尚、熱交換器やバーナを収納し
た燃焼室の内胴の周りには給水管が巻回され、通水が熱
交換器へ流れる前に予熱されて１０％程度熱を回収して
いるため、給湯器全体としての総熱効率は７８％程度で
あるが、依然として低かった。そこで、本発明の給湯器
は上記課題を解決し、ドレンの中和処理を不要とし熱交
換器の耐久性を損なわない高熱効率の給湯器を提供する
ことを目的とする。[0004] On the other hand, there is a sensible heat recovery type which does not require a neutralizing device in the water heater, but the temperature of the combustion exhaust gas cannot be significantly reduced in order to prevent the drain from being generated at all.
Taking the margin into account, the heat efficiency of the entire heat exchanger was only about 68%. Since a water supply pipe is wound around the inner body of the combustion chamber containing the heat exchanger and the burner, and the water is preheated before the water flows to the heat exchanger, about 10% of the heat is recovered. The total thermal efficiency of the water heater as a whole was about 78%, but was still low. Then, the water heater of this invention solves the said subject, and an object of this invention is to provide the water heater of high heat efficiency which does not need the neutralization process of drain and does not spoil the durability of a heat exchanger.
【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、バーナの燃焼排気から顕
熱を回収して伝熱管内の通水を加熱する主熱交換器と、
該主熱交換器で顕熱回収された燃焼排気から潜熱を回収
して伝熱管内の通水を加熱する副熱交換器とを備えた給
湯器において、上記副熱交換器の下方に、上記副熱交換
器で潜熱回収によって発生したドレンを受けると共に該
ドレンを燃焼排気により加熱して蒸発させるドレン蒸発
器を設け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 main heat exchanger for recovering sensible heat from combustion exhaust gas of a burner and heating water passing through a heat transfer tube. When,
A sub-heat exchanger that recovers latent heat from the combustion exhaust gas whose sensible heat has been recovered by the main heat exchanger and heats water passing through the heat transfer tube; and a sub-heat exchanger below the sub-heat exchanger. The gist of the present invention is to provide a drain evaporator that receives the drain generated by the latent heat recovery in the sub heat exchanger and heats and evaporates the drain with the combustion exhaust gas.
【０００６】また、上記課題を解決する本発明の請求項
２記載の給湯器は、請求項１記載の給湯器において、上
記主熱交換器における各部の表面温度を平均化しドレン
を発生させることなく熱交換させて燃焼排気から顕熱を
回収することを要旨とする。According to a second aspect of the present invention, there is provided a water heater according to the first aspect of the present invention, wherein the surface temperature of each part in the main heat exchanger is averaged without generating drain. The gist is to recover heat by exchanging heat and recover sensible heat from combustion exhaust gas.
【０００７】また、上記課題を解決する本発明の請求項
３記載の給湯器は、請求項１または２記載の給湯器にお
いて、上記ドレン蒸発器は、ドレンを受け取る受部と、
上記副熱交換器の伝熱管の真下よりもずれた位置に該受
部から延設され該受部から流れて来たドレンを蒸発させ
る蒸発部とを備えたことを要旨とする。According to a third aspect of the present invention, there is provided a water heater according to the first or second aspect, wherein the drain evaporator has a receiving portion for receiving a drain;
An essential point of the invention is that an evaporator is provided at a position deviated from immediately below the heat transfer tube of the sub heat exchanger, the evaporator extending from the receiving portion and evaporating drain flowing from the receiving portion.
【０００８】また、上記課題を解決する本発明の請求項
４記載の給湯器は、請求項１〜３の何れかに記載の給湯
器において、上記副熱交換器でのドレン発生量を上記ド
レン蒸発器の蒸発能力以下にしたことを要旨とする。According to a fourth aspect of the present invention, there is provided a water heater according to any one of the first to third aspects, wherein the amount of drain generated in the auxiliary heat exchanger is controlled by the drain. The gist is that the evaporation capacity is set to be equal to or less than the evaporation capacity of the evaporator.
【０００９】また、上記課題を解決する本発明の請求項
５記載の給湯器は、請求項１〜４の何れかに記載の給湯
器において、上記ドレン蒸発器の少なくとも上面を親水
性のある耐熱材料で形成したことを要旨とする。According to a fifth aspect of the present invention, there is provided a water heater according to any one of the first to fourth aspects, wherein at least the upper surface of the drain evaporator has a hydrophilic heat-resistant property. The gist is that it is formed of a material.
【００１０】また、上記課題を解決する本発明の請求項
６記載の給湯器は、請求項１〜５の何れかに記載の給湯
器において、上記ドレン蒸発器を上記副熱交換器の伝熱
管の真下よりもずらして設け、上記副熱交換器で発生し
たドレンを上記ドレン蒸発器に案内する案内フィンを該
副熱交換器に設け、該案内フィンの下部先端を該ドレン
蒸発器の上方に配置したことを要旨とする。According to a sixth aspect of the present invention, there is provided a water heater according to the present invention, wherein the drain evaporator is connected to a heat transfer tube of the sub heat exchanger. And a guide fin for guiding the drain generated in the sub heat exchanger to the drain evaporator is provided in the sub heat exchanger, and a lower end of the guide fin is positioned above the drain evaporator. The point is that they are arranged.
【００１１】また、上記課題を解決する本発明の請求項
７記載の給湯器は、請求項１〜６の何れかに記載の給湯
器において、上記副熱交換器の表面に溌水処理を施した
ことを要旨とする。According to a seventh aspect of the present invention, there is provided a water heater according to any one of the first to sixth aspects, wherein a water repellent treatment is performed on a surface of the sub heat exchanger. The gist is that you have done it.
【００１２】上記構成を有する本発明の請求項１記載の
給湯器は、バーナから発生した燃焼排気が主熱交換器を
加熱してから余熱で副熱交換器を加熱する。この際、燃
焼排気はドレン蒸発器も加熱する。供給された通水が副
熱交換器の伝熱管内を流れながら加熱され、主熱交換器
の伝熱管内を流れながら更に加熱される。従って、燃焼
排気は、先ず主熱交換器で冷却されて顕熱の多くが回収
され、主熱交換器よりも低温の湯が流れる副熱交換器で
ドレンの発生する温度まで冷却されてドレンを発生して
顕熱と蒸発潜熱とが回収される。副熱交換器で発生した
ドレンは、ドレン蒸発器で受け取られ蒸発して燃焼排気
中へ戻すため、給湯器の外部へドレンを排出させない。
この結果、ドレンを蒸発させるために、回収した潜熱分
と同量の顕熱が使われるが、ドレンの中和装置を設ける
必要がない。このようにして、ドレンを器体外に排出す
ることなく、主熱交換器と副熱交換器とで顕熱により効
率良く通水を加熱して給湯する。In the water heater according to the first aspect of the present invention having the above structure, the combustion exhaust gas generated from the burner heats the main heat exchanger and then heats the sub heat exchanger with residual heat. At this time, the combustion exhaust heats the drain evaporator. The supplied water is heated while flowing through the heat transfer tubes of the sub heat exchanger, and further heated while flowing through the heat transfer tubes of the main heat exchanger. Therefore, the combustion exhaust gas is first cooled by the main heat exchanger to recover much of the sensible heat, and then cooled to a temperature at which drain is generated by the sub heat exchanger through which hot water flows at a lower temperature than the main heat exchanger, thereby draining the drain. The generated sensible heat and latent heat of evaporation are recovered. The drain generated in the sub heat exchanger is received by the drain evaporator, evaporated and returned to the combustion exhaust, so that the drain is not discharged to the outside of the water heater.
As a result, the same amount of sensible heat as the recovered latent heat is used to evaporate the drain, but there is no need to provide a drain neutralizing device. In this way, the drain water is efficiently heated by the sensible heat in the main heat exchanger and the sub heat exchanger to supply hot water without discharging the drain outside the body.
【００１３】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、主熱交換器が、ドレンを発生させない
温度でバーナから発生した燃焼排気の顕熱の多くを通水
上流側から下流側まで平均的に回収できる。つまり、主
熱交換器でドレンを発生させずに熱効率を向上すること
ができる。[0013] Further, the present invention having the above-described structure is a second aspect of the present invention.
In the described water heater, the main heat exchanger can averagely collect most of the sensible heat of the combustion exhaust gas generated from the burner at a temperature that does not generate drainage from the upstream side to the downstream side. That is, it is possible to improve the thermal efficiency without generating drain in the main heat exchanger.
【００１４】また、上記構成を有する本発明の請求項３
記載の給湯器は、副熱交換器で発生したドレンがドレン
蒸発器の受部に受け取られ、受部のドレンが蒸発部へ移
動して蒸発する。蒸発部が副熱交換器の伝熱管の真下よ
りもずれた位置に設けられるため、蒸発部から発生する
水蒸気は、上昇する際に副熱交換器に接触しにくく、副
熱交換器で再凝縮しにくく、つまり、副熱交換器とドレ
ン蒸発器との間で液化と気化とを繰り返さなくなり、良
好に器体外へ排出される。Further, the present invention has the above-mentioned structure.
In the water heater described above, the drain generated in the sub heat exchanger is received by the receiving portion of the drain evaporator, and the drain of the receiving portion moves to the evaporating portion and evaporates. Since the evaporator is located at a position shifted from just below the heat exchanger tubes of the sub heat exchanger, the steam generated from the evaporator is less likely to contact the sub heat exchanger when rising, and is recondensed in the sub heat exchanger In other words, liquefaction and vaporization are not repeated between the sub heat exchanger and the drain evaporator, and the gas is discharged well out of the body.
【００１５】また、上記構成を有する本発明の請求項４
記載の給湯器は、主熱交換器の温度を露点近くまで下げ
て、燃焼排気の顕熱の多くを主熱交換器で回収するた
め、主熱交換器でドレンを全く発生させずに熱効率を向
上することができる。また、副熱交換器で発生したドレ
ンを全てドレン蒸発器で蒸発させるため、ドレン蒸発器
にドレンが残ることがなく、ドレンの中和処理が不要に
なる。[0015] Further, the present invention has the above-described structure.
The water heater described reduces the temperature of the main heat exchanger to near the dew point, and recovers much of the sensible heat of the combustion exhaust in the main heat exchanger. Can be improved. In addition, since all the drain generated in the sub heat exchanger is evaporated by the drain evaporator, no drain remains in the drain evaporator, and the drain neutralization process is not required.
【００１６】また、上記構成を有する本発明の請求項５
記載の給湯器は、ドレン蒸発器の上面は親水性があるた
め、副熱交換器から落下してきたドレンは、ドレン蒸発
器上で薄く拡散し、蒸発が促進される。Further, the present invention has the above-mentioned structure.
In the water heater described above, since the upper surface of the drain evaporator is hydrophilic, the drain that has fallen from the sub heat exchanger is diffused thinly on the drain evaporator, and evaporation is promoted.
【００１７】また、上記構成を有する本発明の請求項６
記載の給湯器は、副熱交換器で発生したドレンは、案内
フィンを伝ってドレン蒸発器に案内され、ドレン蒸発器
で蒸発する。ドレン蒸発器が副熱交換器の伝熱管の真下
よりもずらして設られているため、ドレン蒸発器で発生
する蒸気は、副熱交換器の伝熱管に接触しにくくなり、
この伝熱管上で再びドレンになることが抑制され、燃焼
排気と共に器体外へ良好に排出され、器体内にドレンが
残らない。しかも、ドレン蒸発器は、燃焼排気の副熱交
換器への接触を妨害せず、副熱交換器の熱効率を向上さ
せる。また、案内フィンの下部先端をドレン蒸発器の上
方に配置したため、ドレン蒸発器が副熱交換器の伝熱管
の真下よりもずらして設られても、ドレンは、副熱交換
器から案内フィンを伝ってドレン蒸発器へ良好に移動
し、ドレン蒸発器以外の所へ落下することはない。しか
も、案内フィンにより、副熱交換器で発生したドレンが
ドレン蒸発器に円滑に案内され次々に蒸発していくた
め、ドレンが副熱交換器に留まりにくくなり、酸性ドレ
ンによる副熱交換器の腐食を防止でき、副熱交換器の耐
久性が向上する。Further, the present invention has the above-mentioned structure.
In the water heater described above, the drain generated in the sub heat exchanger is guided to the drain evaporator via the guide fins, and is evaporated in the drain evaporator. Since the drain evaporator is provided at a position shifted from just below the heat transfer tube of the sub heat exchanger, the steam generated by the drain evaporator is less likely to contact the heat transfer tube of the sub heat exchanger,
Drain on the heat transfer tube is suppressed again, and is discharged well outside the body together with the combustion exhaust gas, so that no drain remains in the body. In addition, the drain evaporator does not hinder the contact of the combustion exhaust gas with the sub heat exchanger, and improves the thermal efficiency of the sub heat exchanger. In addition, since the lower end of the guide fin is located above the drain evaporator, even if the drain evaporator is displaced from just below the heat transfer tube of the sub-heat exchanger, the drain can remove the guide fin from the sub-heat exchanger. It travels well to the drain evaporator and does not fall to any place other than the drain evaporator. In addition, the guide fins allow the drain generated in the sub heat exchanger to be smoothly guided to the drain evaporator and evaporate one after another, so that it is difficult for the drain to remain in the sub heat exchanger, and the drainage of the sub heat exchanger by the acid drain is reduced. Corrosion can be prevented, and the durability of the sub heat exchanger improves.
【００１８】また、上記構成を有する本発明の請求項７
記載の給湯器は、副熱交換器の表面が溌水処理されてい
るため、発生したドレンが酸性ドレンになる前にはじか
れてドレン蒸発器へ円滑に移動し、この結果、副熱交換
器の耐久性が向上すると共に、ドレンを次々と発生させ
て熱効率が向上する。しかも、これは滴状凝縮なので膜
状凝縮よりも熱効率が高い。Further, the present invention has the above-mentioned structure.
In the water heater described, since the surface of the sub heat exchanger is subjected to water repellent treatment, the generated drain is repelled before it becomes an acidic drain and smoothly moves to the drain evaporator. And the thermal efficiency is improved by generating drains one after another. Moreover, since this is droplet condensation, the thermal efficiency is higher than film condensation.
【００１９】[0019]
【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
実施形態を説明する。本実施形態の給湯器は、図１に示
すように、器具本体１２内に燃焼室２０が設けられ、そ
の下方にＤＣモータ４８と連結した給気ファン３６が取
り付けられる。尚、器具本体１２には、外気を燃焼用空
気として取り込むための給気口３０が形成される。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 a water heater according to the present invention will be described below. In the water heater of the present embodiment, as shown in FIG. 1, a combustion chamber 20 is provided in the appliance body 12, and an air supply fan 36 connected to a DC motor 48 is attached below the combustion chamber 20. The appliance body 12 has an air supply port 30 for taking in outside air as combustion air.
【００２０】燃焼室２０内には、下から順に、燃料ガス
と給気ファン３６からの一次空気との混合ガスを燃焼す
るバーナ２２と、バーナ２２からの燃焼排気の顕熱の多
くを回収する主熱交換器１８と、ドレンを受けて蒸発さ
せるドレン蒸発器１７と、主熱交換器１８で回収しきれ
なかった顕熱とドレンを発生させて回収する潜熱とを回
収する副熱交換器１９とが設けられる。燃焼室２０の上
部には、主熱交換器１８，副熱交換器１９で熱交換後の
燃焼排気を器体外へ排出する排気口４４が形成される。In the combustion chamber 20, a burner 22 for burning a mixed gas of fuel gas and primary air from an air supply fan 36 and a large part of the sensible heat of the combustion exhaust gas from the burner 22 are collected in order from the bottom. A main heat exchanger 18, a drain evaporator 17 for receiving and evaporating drain, and a sub heat exchanger 19 for recovering sensible heat that could not be recovered by the main heat exchanger 18 and latent heat for generating and recovering drain. Are provided. In the upper part of the combustion chamber 20, an exhaust port 44 for discharging the combustion exhaust gas after the heat exchange in the main heat exchanger 18 and the sub heat exchanger 19 to the outside of the body is formed.
【００２１】器具本体１２内に設けられる通水管は銅製
で、上流から順に、燃焼室２０を外側で巻回する給水管
１４，副熱交換器１９として設けられ奥行方向で蛇行す
る副伝熱管１９ａ，主熱交換器１８に設けられ同じく奥
行方向で蛇行する主伝熱管１８ａ，出湯管１６からな
る。ドレン蒸発器１７は、後述の熱回収フィン１８ｂ間
を通過する燃焼排気が副伝熱管１８ａに接触することを
妨げないように、副伝熱管１８ａの真下には設けられ
ず、左右にずらして設けられ、上から見ると副伝熱管１
９ａによって隠れない。このドレン蒸発器１７は、ステ
ンレス製であり、最も近い副伝熱管１９ａの鉛直線から
幅方向に離れるほど上方へ傾斜して延びる断面皿状で奥
行方向に延びて形成され、その上表面は、親水性を高め
るために、ショットブラスト加工により粗くされ、しか
も、チタンコートによる耐食処理が施されている。尚、
ドレン蒸発器１７は、機能的に区分すると、副伝熱管１
９ａの鉛直線に近くてドレンを受ける皿底部の受部１７
ａと、副伝熱管１８ａの鉛直線から離れて上方へ傾斜し
てドレンを蒸発させる蒸発部１７ｂとからなる。The water pipe provided in the apparatus main body 12 is made of copper, and is provided as a water supply pipe 14 which winds the combustion chamber 20 on the outside and a sub-heat exchanger 19 which is arranged in order from the upstream and a sub-heat transfer pipe 19a meandering in the depth direction. The main heat exchanger 18 comprises a main heat transfer tube 18a and a tapping tube 16 which meander in the depth direction. The drain evaporator 17 is not provided immediately below the sub heat transfer tube 18a but is shifted left and right so as not to prevent combustion exhaust passing between heat recovery fins 18b described later from contacting the sub heat transfer tube 18a. The sub heat transfer tube 1
Not hidden by 9a. The drain evaporator 17 is made of stainless steel, and is formed in a dish-shaped cross-section extending inclining upward as the distance from the vertical line of the nearest auxiliary heat transfer tube 19a in the width direction increases and extends in the depth direction. In order to enhance the hydrophilicity, it is roughened by shot blasting, and is subjected to a corrosion-resistant treatment with a titanium coat. still,
The drain evaporator 17 is functionally divided into the sub heat transfer tubes 1.
Receiving part 17 at the bottom of the dish receiving the drain near the vertical line 9a
a and an evaporating section 17b that evaporates the drain while being inclined upward away from the vertical line of the sub heat transfer tube 18a.
【００２２】また、主伝熱管１８ａには、燃焼熱を吸収
をする多数の熱回収フィン１８ｂが奥行方向に設けら
れ、通水上流ほど熱回収フィン１８ｂの形成ピッチが大
きい。一方、副伝熱管１９ａには、発生したドレンを左
右のドレン蒸発器１７へ案内する多数の案内フィン１９
ｂが奥行方向に３ｍｍ程度のピッチで設けられる。この
案内フィン１９ｂの各下部先端は、ドレン蒸発器１７の
受部１７ａの真上に配置される。A large number of heat recovery fins 18b are provided in the main heat transfer tube 18a in the depth direction for absorbing combustion heat, and the pitch of the heat recovery fins 18b is larger toward the upstream of the passage of water. On the other hand, a number of guide fins 19 for guiding the generated drain to the left and right drain evaporators 17 are provided in the sub heat transfer tube 19a.
b are provided at a pitch of about 3 mm in the depth direction. The lower end of each of the guide fins 19b is disposed directly above the receiving portion 17a of the drain evaporator 17.
【００２３】給水管１４には水流センサや水ガバナを備
える水側制御ユニット５０が設けられ、またバーナ２２
へのガス管５２には主電磁弁５４及びガス比例弁５６が
設けられる。また、水側制御ユニット５０内の水流セン
サや、主電磁弁５４及びガス比例弁５６、そしてＤＣモ
ータ４８等は、この給湯器１０の燃焼を制御するバーナ
コントローラ５８に電気的に接続されている。The water supply pipe 14 is provided with a water side control unit 50 having a water flow sensor and a water governor.
A main solenoid valve 54 and a gas proportional valve 56 are provided in the gas pipe 52. The water flow sensor in the water-side control unit 50, the main solenoid valve 54, the gas proportional valve 56, the DC motor 48, and the like are electrically connected to a burner controller 58 that controls the combustion of the water heater 10. .
【００２４】このように構成された給湯器１０では、図
示しない給湯栓を開くことにより給水管１４に水（図中
破線矢印）が流れ、水側制御ユニット５０内の水流セン
サからの検知信号によりバーナコントローラ５８が制御
動作を行い、給気ファン３６がＤＣモータ４８の駆動に
より回転し始める。所定のプリパージが完了すると、バ
ーナ２２の主電磁弁５４及びガス比例弁５６が開いてバ
ーナ２２にガス（図中実線矢印）が供給され、図示しな
いイグナイタによりバーナ２２に点火が行われる。In the water heater 10 configured as described above, when a hot water tap (not shown) is opened, water (dashed arrow in the figure) flows through the water supply pipe 14 and is detected by a detection signal from a water flow sensor in the water side control unit 50. The burner controller 58 performs a control operation, and the air supply fan 36 starts rotating by the driving of the DC motor 48. When the predetermined prepurge is completed, the main solenoid valve 54 and the gas proportional valve 56 of the burner 22 are opened to supply gas (solid arrow in the drawing) to the burner 22, and the burner 22 is ignited by an igniter (not shown).
【００２５】点火動作が終了すると、比例制御が開始さ
れ、図示しない出湯温サーミスタで検出される湯温と設
定温度との差があると、バーナコントローラ５８でそれ
を判断しガス比例弁５６へ信号を送り、ガス量を連続的
に変化させて熱交換器１８の出口温度を一定に保つ。ま
た、ガス比例弁５６によるガス量の変化に応じてバーナ
コントローラ５８から給気ファン３６のＤＣモータ４８
に信号が送られ、給気ファン３６の回転数も変えられ、
常にガス量と給気量とが所定の関係に保たれるように制
御される。When the ignition operation is completed, proportional control is started. If there is a difference between the hot water temperature detected by a tapping temperature thermistor (not shown) and the set temperature, the burner controller 58 determines the difference and sends a signal to the gas proportional valve 56. To keep the outlet temperature of the heat exchanger 18 constant by continuously changing the gas amount. Further, the burner controller 58 controls the DC motor 48 of the air supply fan 36 in accordance with a change in the gas amount by the gas proportional valve 56.
, The number of rotations of the air supply fan 36 is changed,
Control is performed such that the gas amount and the supply amount are always maintained in a predetermined relationship.
【００２６】このような燃焼制御において、給気ファン
３６の動作に伴い、器具本体１２に設けられる給気口３
０より外気が器具本体１２内に吸引され、バーナ２２へ
導入されて燃焼用空気として燃焼に供される。バーナ２
２の炎口近傍では混合気が燃焼して火炎を形成し、主熱
交換器１８の上流側近傍に至る間に燃焼が完結（完全燃
焼）する。主熱交換器１８を排気流路の上流に設け、副
熱交換器１９を排気流路の下流に設けたため、バーナ２
２からの高温の燃焼排気が、給気ファン３６により主熱
交換器１８の各熱回収フィン１８ｂ間を貫流し良好に熱
交換し、これにより温度の下がった燃焼排気が、副熱交
換器１９においても多少熱交換して排気口４４から器具
の外へ排出される。In such a combustion control, the air supply port 3 provided in the appliance body 12 is operated in accordance with the operation of the air supply fan 36.
From outside, outside air is sucked into the appliance main body 12, introduced into the burner 22, and provided for combustion as combustion air. Burner 2
In the vicinity of the flame outlet 2, the air-fuel mixture burns to form a flame, and the combustion is completed (complete combustion) before reaching the vicinity of the upstream side of the main heat exchanger 18. Since the main heat exchanger 18 is provided upstream of the exhaust passage and the sub heat exchanger 19 is provided downstream of the exhaust passage, the burner 2
2 through the heat recovery fins 18b of the main heat exchanger 18 through the air supply fan 36 to exchange heat satisfactorily. In this case, heat is exchanged to some extent and the gas is discharged from the exhaust port 44 to the outside of the device.
【００２７】主熱交換器１８では、多数の熱回収フィン
１８ｂを設けて、ドレンが発生する限界温度（露点）近
くまで燃焼排気温度を低下させることによって、主熱交
換器１８でドレンを全く発生させずに主熱交換器１８の
熱効率が７５％になり高くすることができる。一方、副
熱交換器１９の副伝熱管１９ａでは、燃焼熱で加熱され
る前の低温の水が流れるため、燃焼排気中の水蒸気は、
熱交換により冷却されて結露しドレンになる。この水蒸
気の凝縮により副熱交換器１９は、顕熱に加えて蒸発潜
熱も回収し、通水を予熱している。更に、ドレン蒸発器
１７が副伝熱管の１９ａの真下よりも左右にずらして設
られ、しかも、蒸発部１７ｂが傾斜しているため、燃焼
排気がドレン蒸発器１７に妨害されず円滑に副伝熱管１
９ａへ流れて熱交換が促進される。尚、通水は、巻回さ
れた給水管１４を流れる際にも予熱され、熱効率１０％
程度の熱を回収する。In the main heat exchanger 18, a large number of heat recovery fins 18b are provided to reduce the temperature of the combustion exhaust gas to near the limit temperature (dew point) at which drain is generated, so that no drain is generated in the main heat exchanger 18. Without doing so, the thermal efficiency of the main heat exchanger 18 can be increased to 75%. On the other hand, in the sub heat exchanger tube 19a of the sub heat exchanger 19, since low-temperature water before being heated by the combustion heat flows, the steam in the combustion exhaust gas is
Cooled by heat exchange to form dew. By the condensation of the water vapor, the sub heat exchanger 19 recovers the latent heat of evaporation in addition to the sensible heat, and preheats the water flow. Further, since the drain evaporator 17 is provided to be shifted left and right below the sub heat transfer tube 19a and the evaporating portion 17b is inclined, the combustion exhaust gas is smoothly disturbed by the drain evaporator 17 without being obstructed by the drain evaporator 17. Heat tube 1
9a to promote heat exchange. The water flow is also preheated when flowing through the wound water supply pipe 14, and the thermal efficiency is 10%.
Recover some heat.
【００２８】このようにして、副熱交換器１９で、ドレ
ンが発生する程度に燃焼排気の温度を低下させることに
より、主熱交換器１８では回収しきれなかった顕熱（総
発熱量の２％程度）を回収する。この結果、給湯器１０
の熱効率は、予熱時に回収した熱１０％と主熱交換器１
８で回収した顕熱７５％との合計に、副熱交換器１９で
回収した顕熱２％を加えた８７％となり、非常に高くな
る。In this way, by lowering the temperature of the combustion exhaust to the extent that drain is generated in the sub heat exchanger 19, the sensible heat (2 of the total heat generation) that could not be recovered in the main heat exchanger 18 %). As a result, the water heater 10
The thermal efficiency of the main heat exchanger 1 is 10% of the heat recovered during preheating.
The sum of the sensible heat recovered in step 8 and the sensible heat recovered in sub heat exchanger 19 is 87%, which is very high.
【００２９】案内フィン１９ｂが奥行方向に狭い間隔で
設けられるため、副伝熱管１９ａで発生したドレンは、
近くの案内フィン１９ｂを伝う。そして、案内フィン１
９ｂの下部先端から、燃焼排気によって加熱されるドレ
ン蒸発器１７の受部１７ａへ落下して蒸発部１７ｂで蒸
発する。この蒸発部１７ｂが傾斜しているため、燃焼排
気が流れることを邪魔しないで燃焼排気との接触面積を
大きく取ることができ、ドレンを良好に蒸発させること
ができる。この蒸気は、上昇する際に、ドレン蒸発器１
７の斜め上方に設けられた副伝熱管１９ａに接触しにく
く、副伝熱管１９ａでの再ドレン化が抑制され、燃焼排
気と共に器体外へ良好に排出され、器体内にドレンが残
ることがない。しかも、ドレン蒸発器１７の上表面が親
水処理されているため、ドレンはその表面上でその副伝
熱管１９ａの鉛直線から離れる方向へ拡散し蒸発面積を
大きくとって円滑に蒸発し、再ドレン化しにくく、ドレ
ン蒸発器１７にドレンが残らない。このように、再ドレ
ン化させずに水蒸気を良好に器体外へ排出することによ
り、副熱交換器１９での潜熱回収をスムーズに行うこと
ができ、熱効率が向上する。Since the guide fins 19b are provided at small intervals in the depth direction, the drain generated in the sub heat transfer tube 19a is
Drive along the nearby guide fin 19b. And guide fin 1
From the lower end of 9b, it falls into the receiving part 17a of the drain evaporator 17 heated by the combustion exhaust gas and evaporates in the evaporating part 17b. Since the evaporating portion 17b is inclined, the contact area with the combustion exhaust can be increased without obstructing the flow of the combustion exhaust, and the drain can be satisfactorily evaporated. When this vapor rises, the drain evaporator 1
7 does not easily come into contact with the sub heat transfer tube 19a provided diagonally above, the re-drainage in the sub heat transfer tube 19a is suppressed, and the exhaust gas is discharged well outside the body together with the combustion exhaust, and the drain does not remain in the body. . In addition, since the upper surface of the drain evaporator 17 has been subjected to hydrophilic treatment, the drain diffuses on the surface in a direction away from the vertical line of the auxiliary heat transfer tube 19a, and a large evaporation area is taken to smoothly evaporate. And the drain does not remain in the drain evaporator 17. In this manner, by desirably discharging the steam to the outside of the body without re-draining, the latent heat recovery in the sub heat exchanger 19 can be smoothly performed, and the thermal efficiency is improved.
【００３０】また、ドレン蒸発器１７が副伝熱管１９ａ
の真下に配置されなくても、案内フィン１９ｂの下部先
端をドレン蒸発器１７の上方に配置したため、ドレン
は、副伝熱管１９ａから案内フィン１９ｂを伝ってドレ
ン蒸発器１７へ良好に移動し、ドレン蒸発器１７以外の
所へ落下することはない。つまり、酸性ドレンによるバ
ーナ２２の炎孔の目詰まりの心配がなく、良好な燃焼状
態が維持される。The drain evaporator 17 is connected to the auxiliary heat transfer tube 19a.
Even if the guide fins 19b are not disposed directly below the drain fins 19b, the lower end of the guide fins 19b is disposed above the drain evaporators 17, so that the drains move from the auxiliary heat transfer tubes 19a to the drain evaporators 17 through the guide fins 19b, It does not fall to a place other than the drain evaporator 17. That is, there is no fear of clogging of the burner hole of the burner 22 due to the acidic drain, and a favorable combustion state is maintained.
【００３１】更に、案内フィン１９ｂにより、副熱交換
器１９で発生したドレンがドレン蒸発器１７に円滑に案
内され、しかも、親水処理されたドレン蒸発器１７上で
酸性ドレンになる前に次から次へと蒸発していくため、
ドレンが副熱交換器１９に留まりにくくなり、酸性ドレ
ンによる副熱交換器１９の腐食を防止でき、副熱交換器
１９の耐久性が向上する。Further, the drain generated in the sub-heat exchanger 19 is smoothly guided to the drain evaporator 17 by the guide fins 19b. To evaporate to the next,
Drain hardly stays in the sub heat exchanger 19, corrosion of the sub heat exchanger 19 due to acidic drain can be prevented, and durability of the sub heat exchanger 19 improves.
【００３２】この結果、酸性ドレンを器体外へ排出する
ことがないため、酸性ドレンを希釈したり、中和する必
要がなく、給湯器１０の構造が簡単で、しかも、製造コ
ストを抑えることができる。更に、ドレン蒸発器１７は
燃焼排気により加熱されるため、ドレンを蒸発させるた
めに余分な費用がかからず、また、構造が簡単で製造コ
ストを抑えることができる。As a result, there is no need to dilute or neutralize the acidic drain because the acidic drain is not discharged out of the vessel, so that the structure of the water heater 10 is simple and the production cost can be reduced. it can. Further, since the drain evaporator 17 is heated by the combustion exhaust, no extra cost is required for evaporating the drain, and the structure is simple and the manufacturing cost can be suppressed.
【００３３】従って、上述した給湯器１０では、器体か
らのドレン排出を防止してドレンの中和処理を不要と
し、しかも、主熱交換器１８，副熱交換器１９の耐久性
を損なうことがなく、更に、主熱交換器１８と副熱交換
器１９とにおいて燃焼排気の顕熱を最大限回収して器具
全体の熱効率を８７％にまで上げることができる。Accordingly, in the above-described water heater 10, the drainage from the container is prevented, so that the neutralization of the drain is not required, and the durability of the main heat exchanger 18 and the sub heat exchanger 19 is impaired. Furthermore, the sensible heat of the combustion exhaust gas can be recovered to the maximum in the main heat exchanger 18 and the sub heat exchanger 19, and the heat efficiency of the entire apparatus can be increased to 87%.
【００３４】以上、本発明の実施形態について説明した
が、本発明はこうした実施形態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、ファ
ンを備えない自然燃焼式の給湯器に本発明を適用しても
よい。また、副熱交換器１９の下方であれば、燃焼排気
流路において主熱交換器１８の上流側にドレン蒸発器を
設けてもよい。例えば、図１においてバーナ２２と主熱
交換器１８との間にドレン蒸発器を設けてもよい。ま
た、燃焼室内に、炎口を下方に向けたバーナ，主熱交換
器，副熱交換器，ドレン蒸発器を上から順に設けてもよ
い。この場合には、主熱交換器が副熱交換器の上方にあ
るため、ドレンが主熱交換器に落下することが決して無
く、酸性ドレンによる主熱交換器の目詰まりは起こらな
い。また、ドレン蒸発器１７は、ステンレス鋼板に代え
て、耐食性を有するチタン板にショットブラスト加工等
の親水処理したものであってもよい。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, the present invention may be applied to a natural combustion type water heater having no fan. In addition, a drain evaporator may be provided upstream of the main heat exchanger 18 in the combustion exhaust passage if it is below the sub heat exchanger 19. For example, a drain evaporator may be provided between the burner 22 and the main heat exchanger 18 in FIG. Further, a burner with a flame opening directed downward, a main heat exchanger, a sub heat exchanger, and a drain evaporator may be provided in order from the top in the combustion chamber. In this case, since the main heat exchanger is above the sub heat exchanger, the drain never falls into the main heat exchanger, and the main heat exchanger is not clogged with the acid drain. Further, the drain evaporator 17 may be made of a titanium plate having corrosion resistance and subjected to a hydrophilic treatment such as shot blasting, instead of the stainless steel plate.
【００３５】また、副伝熱管１９ａに案内フィン１９ｂ
を設けなくてもよい。例えば、図２に示すように、副伝
熱管１９ａの真下には副伝熱管１９ａの鉛直線から幅方
向に離れるほど下方へ傾斜する受部２７ａと、受部２７
ａ下端から水平に延びた蒸発部２７ｂとを備えたドレン
蒸発器２７を設ける。こうした構成により、副伝熱管１
９ａから落下してきたドレンは、傾斜した受部２７ａを
伝って蒸発部２７ｂへ流下しながら蒸発して、副伝熱管
１９ａに接触することなく、器体外へ排出される。従っ
て、副伝熱管１９ａで再ドレン化を防止して円滑に再蒸
発させることができ、しかも、案内フィン１９ｂの製造
コストを削減できる。The guide fins 19b are connected to the auxiliary heat transfer tubes 19a.
Need not be provided. For example, as shown in FIG. 2, immediately below the sub heat transfer tube 19 a, a receiving portion 27 a that is inclined downward as being away from the vertical line of the sub heat transfer tube 19 a in the width direction, and a receiving portion 27.
a A drain evaporator 27 having an evaporator 27b extending horizontally from the lower end is provided. With such a configuration, the sub heat transfer tube 1
The drain that has fallen from 9a evaporates while flowing down the inclined receiving portion 27a to the evaporating portion 27b, and is discharged outside the body without contacting the sub heat transfer tube 19a. Therefore, re-draining can be prevented by the auxiliary heat transfer tube 19a, and the re-evaporation can be performed smoothly, and the manufacturing cost of the guide fin 19b can be reduced.
【００３６】また、副熱交換器１９に酸化チタンコーテ
ィング等による溌水処理を施してもよい。これにより、
燃焼排気中の水蒸気は直接副伝熱管１９ａに接触して滴
状凝縮するため、熱伝達が膜状凝縮よりも１５倍程度に
なり非常に大きい。つまり、膜状凝縮では、燃焼排気中
の水蒸気がドレン膜によって覆われている副伝熱管１９
ａに接触しづらく熱伝達しにくいが、溌水処理された副
伝熱管１９ａでは滴状凝縮するため、水蒸気が直接副伝
熱管１９ａに接触でき、熱効率が膜状凝縮よりも高くな
る。また、この溌水処理により、ドレンが副熱交換器１
９からドレン蒸発器１７へ落下しやすくなって、ドレン
の発生・落下サイクルが短くなり、副熱交換器１９で次
々にドレンを発生させることができ、熱交換が促進さ
れ、熱効率を更に高めることができる。これに加えて、
発生したドレンは、溌水処理により副熱交換器１９に長
時間留まりにくいため、副熱交換器１９を腐食させず、
副熱交換器１９の耐久性を向上することもできる。The sub heat exchanger 19 may be subjected to a water-repellent treatment with a titanium oxide coating or the like. This allows
Since the water vapor in the combustion exhaust directly contacts the sub heat transfer tube 19a and condenses in a droplet form, the heat transfer is about 15 times that of the film condensation and is very large. That is, in the film condensation, the water vapor in the combustion exhaust gas is covered by the sub heat transfer tube 19 covered with the drain film.
However, the water-repellent treatment of the sub heat transfer tube 19a causes the water vapor to directly contact the sub heat transfer tube 19a, and the heat efficiency is higher than that of the film condensation. In addition, by this water repellent treatment, the drain is removed from the sub heat exchanger 1.
9 is easily dropped into the drain evaporator 17, the drain generation / drop cycle is shortened, the drain can be generated one after another in the sub heat exchanger 19, heat exchange is promoted, and the heat efficiency is further increased. Can be. In addition to this,
The generated drain hardly stays in the sub heat exchanger 19 for a long time due to the water repellent treatment, so that the sub heat exchanger 19 is not corroded,
The durability of the sub heat exchanger 19 can also be improved.
【００３７】[0037]
【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、副熱交換器で発生したドレンを
ドレン蒸発器で蒸発させるため、ドレンを器体外へ排出
せずドレンの中和処理が不要になる。しかも、ドレン蒸
発器の加熱源として燃焼排気熱をそのまま利用するた
め、ドレン蒸発のための費用が余分にかからず、また、
構造が簡単で製造コストを抑えることができる。加え
て、発生したドレンが副熱交換器に溜まらないため、副
熱交換器の耐久性が向上する。また、ドレン中和処理を
する必要なく、燃焼排気の顕熱の殆どを回収して熱効率
を非常に高くすることができる。As described in detail above, claim 1 of the present invention
According to the water heater described above, since the drain generated in the sub heat exchanger is evaporated by the drain evaporator, the drain is not discharged to the outside of the container, and the drain neutralization process is not required. Moreover, since the combustion exhaust heat is used as it is as a heating source for the drain evaporator, no extra cost is required for drain evaporation, and
The structure is simple and the manufacturing cost can be reduced. In addition, since the generated drain does not accumulate in the sub heat exchanger, the durability of the sub heat exchanger is improved. In addition, it is possible to recover most of the sensible heat of the combustion exhaust gas without performing the drain neutralization treatment, and to increase the thermal efficiency very much.
【００３８】また、請求項２記載の給湯器によれば、主
熱交換器では、各部の表面温度を平均化してドレンの発
生しない温度に保つため、ドレンを発生させずに熱効率
を向上することができる。According to the second aspect of the present invention, in the main heat exchanger, the surface temperature of each part is averaged to maintain a temperature at which drain does not occur, so that heat efficiency is improved without generating drain. Can be.
【００３９】また、請求項３記載の給湯器によれば、ド
レン蒸発器の蒸発部を副熱交換器の伝熱管の真下よりも
ずれた位置に設けたため、ドレンを蒸発させた後、再ド
レン化させず、水蒸気は良好に器体外へ排出され、熱交
換を促進できる。According to the third aspect of the present invention, since the evaporator of the drain evaporator is provided at a position shifted from immediately below the heat transfer tube of the sub heat exchanger, the drain is evaporated and then re-drained. Without being converted, the water vapor is discharged well out of the vessel, and can promote heat exchange.
【００４０】また、請求項４記載の給湯器によれば、副
熱交換器で発生したドレンを全て蒸発させるため、器体
外へのドレン排出を確実に防止でき、ドレンの中和処理
をする必要がなく、製造コストを大幅に削減できる。According to the fourth aspect of the present invention, since all the drain generated in the sub heat exchanger is evaporated, drain discharge to the outside of the container can be reliably prevented, and it is necessary to neutralize the drain. And production costs can be greatly reduced.
【００４１】また、請求項５記載の給湯器によれば、ド
レン蒸発器の上面は親水性があるため、ドレン蒸発器上
のドレンを拡散して蒸発を促し、副熱交換器での顕熱お
よび潜熱の回収を促進して熱効率を向上できる。According to the fifth aspect of the present invention, since the upper surface of the drain evaporator is hydrophilic, the drain on the drain evaporator is diffused to promote evaporation, and the sensible heat in the sub heat exchanger is increased. Further, the recovery of latent heat can be promoted to improve the thermal efficiency.
【００４２】また、請求項６記載の給湯器によれば、ド
レン蒸発器が副熱交換器の伝熱管の真下よりもずらして
形成されるため、ドレン蒸発器で発生する蒸気が副熱交
換器の伝熱管上で再びドレンになることを抑制でき、器
体内にドレンを残さず、ドレン蒸発器の耐久性を向上さ
せることができる。According to the water heater of the sixth aspect, the drain evaporator is formed so as to be displaced from immediately below the heat transfer tube of the sub heat exchanger, so that the steam generated in the drain evaporator is discharged from the sub heat exchanger. Can be prevented from being drained again on the heat transfer tube, and the durability of the drain evaporator can be improved without leaving the drain in the vessel.
【００４３】また、請求項７記載の給湯器によれば、副
熱交換器の表面に溌水処理を施したため、副熱交換器に
ドレンを留めることがなく、副熱交換器の耐久性および
熱効率を向上させることができる。According to the seventh aspect of the present invention, since the water repellent treatment is performed on the surface of the sub heat exchanger, the drain is not fixed to the sub heat exchanger. Thermal efficiency can be improved.
【図１】本実施形態としての強制燃焼式給湯器の概略図
である。FIG. 1 is a schematic diagram of a forced combustion water heater as an embodiment.
【図２】変更例としての給湯器の一部を正面からみた断
面図である。FIG. 2 is a cross-sectional view of a part of a water heater as a modified example as viewed from the front.
１４…給水管、１７，２７…ドレン蒸発器、１７ａ，２
７ａ…受部、１７ｂ，２７ｂ…蒸発部、１８…主熱交換
器、１８ａ…主伝熱管、１８ｂ…熱回収フィン、１９…
副熱交換器、１９ａ…副伝熱管、１９ｂ…案内フィン、
２０…燃焼室、２２…バーナ。14 ... water supply pipe, 17, 27 ... drain evaporator, 17a, 2
7a: receiving portion, 17b, 27b: evaporating portion, 18: main heat exchanger, 18a: main heat transfer tube, 18b: heat recovery fin, 19 ...
Sub heat exchanger, 19a: sub heat transfer tube, 19b: guide fin,
20: combustion chamber, 22: burner.
Claims (7)
熱管内の通水を加熱する主熱交換器と、該主熱交換器で
顕熱回収された燃焼排気から潜熱を回収して伝熱管内の
通水を加熱する副熱交換器とを備えた給湯器において、 上記副熱交換器の下方に、上記副熱交換器で潜熱回収に
よって発生したドレンを受けると共に該ドレンを燃焼排
気により加熱して蒸発させるドレン蒸発器を設けたこと
を特徴とする給湯器。1. A main heat exchanger for recovering sensible heat from the combustion exhaust gas of a burner to heat water passing through a heat transfer tube, and recovering latent heat from the combustion exhaust gas recovered by the main heat exchanger for sensible heat recovery. A water heater having a sub heat exchanger for heating water flowing in the heat transfer tube, wherein a drain generated by latent heat recovery in the sub heat exchanger is received below the sub heat exchanger, and the drain is discharged. A water heater characterized by comprising a drain evaporator for heating and evaporating the water.
を平均化しドレンを発生させることなく熱交換させて燃
焼排気から顕熱を回収する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 surface temperature of each part in the main heat exchanger is averaged, and heat is exchanged without generating drain to recover sensible heat from the combustion exhaust gas.
受部と、上記副熱交換器の伝熱管の真下よりもずれた位
置に該受部から延設され該受部から流れて来たドレンを
蒸発させる蒸発部とを備えたことを特徴とする請求項１
または２記載の給湯器。3. The drain evaporator has a receiving portion for receiving drain and a drain extending from the receiving portion at a position shifted from immediately below a heat transfer tube of the sub heat exchanger and flowing from the receiving portion. And an evaporator for evaporating the water.
Or the water heater according to 2.
ドレン蒸発器の蒸発能力以下にしたことを特徴とする請
求項１〜３の何れかに記載の給湯器。4. The water heater according to claim 1, wherein the amount of drain generated in the sub heat exchanger is set to be equal to or less than the evaporation capacity of the drain evaporator.
水性のある耐熱材料で形成したことを特徴とする請求項
１〜４の何れかに記載の給湯器。5. The water heater according to claim 1, wherein at least the upper surface of the drain evaporator is formed of a hydrophilic heat-resistant material.
熱管の真下よりもずらして設け、 上記副熱交換器で発生したドレンを上記ドレン蒸発器に
案内する案内フィンを該副熱交換器に設け、該案内フィ
ンの下部先端を該ドレン蒸発器の上方に配置したことを
特徴とする請求項１〜５の何れかに記載の給湯器。6. The drain evaporator is provided so as to be shifted from immediately below a heat transfer tube of the sub heat exchanger, and a guide fin for guiding the drain generated in the sub heat exchanger to the drain evaporator is provided in the sub heat exchanger. The water heater according to any one of claims 1 to 5, wherein a lower end of the guide fin is disposed above the drain evaporator.
たことを特徴とする請求項１〜６の何れかに記載の給湯
器。7. The water heater according to claim 1, wherein a water repellent treatment is applied to a surface of the sub heat exchanger.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000291529A JP4301718B2 (en) | 2000-09-26 | 2000-09-26 | Water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000291529A JP4301718B2 (en) | 2000-09-26 | 2000-09-26 | Water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002098413A true JP2002098413A (en) | 2002-04-05 |
| JP4301718B2 JP4301718B2 (en) | 2009-07-22 |
Family
ID=18774586
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000291529A Expired - Fee Related JP4301718B2 (en) | 2000-09-26 | 2000-09-26 | Water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP4301718B2 (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1508756A1 (en) * | 2003-08-20 | 2005-02-23 | Paloma Industries, Ltd. | Water heater |
| US7360535B2 (en) | 2003-12-19 | 2008-04-22 | Paloma Industries, Limited | Hot water apparatus |
| JP2009133551A (en) * | 2007-11-30 | 2009-06-18 | Noritz Corp | Hot water supply apparatus |
| CN102734923A (en) * | 2011-04-15 | 2012-10-17 | 于忠顺 | Straw superconducting air hot blast stove |
-
2000
- 2000-09-26 JP JP2000291529A patent/JP4301718B2/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1508756A1 (en) * | 2003-08-20 | 2005-02-23 | Paloma Industries, Ltd. | Water heater |
| US6971335B2 (en) | 2003-08-20 | 2005-12-06 | Paloma Industries, Limited | Water heater |
| US7360535B2 (en) | 2003-12-19 | 2008-04-22 | Paloma Industries, Limited | Hot water apparatus |
| JP2009133551A (en) * | 2007-11-30 | 2009-06-18 | Noritz Corp | Hot water supply apparatus |
| CN102734923A (en) * | 2011-04-15 | 2012-10-17 | 于忠顺 | Straw superconducting air hot blast stove |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4301718B2 (en) | 2009-07-22 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP4099141B2 (en) | Hot water equipment | |
| CN100458298C (en) | Water heater | |
| JP2011506908A (en) | Up-burning condensing boiler heat exchanger | |
| EP1508756B1 (en) | Water heater | |
| JP2002098413A (en) | Hot water supply apparatus | |
| CN105222347A (en) | Condensed type combustion gas water heater | |
| JP4086455B2 (en) | Water heater | |
| JP4176588B2 (en) | Water heater | |
| JP2002267273A (en) | Hot water supply apparatus | |
| JP2005180778A (en) | Water heating appliance | |
| JP4176297B2 (en) | Water heater | |
| JP4852980B2 (en) | Water heater | |
| JP4510318B2 (en) | Exhaust tube adapter | |
| JP4099139B2 (en) | Water heater | |
| JP4099140B2 (en) | Hot water equipment | |
| JP6247031B2 (en) | Water heater | |
| JP2003161527A (en) | Heat exchange device | |
| KR100581589B1 (en) | A latent heat exchanger for a condensing boiler | |
| KR100999996B1 (en) | High efficiency hot-water supplyer | |
| JP3991016B2 (en) | Water heater | |
| JP2004093129A (en) | Water heater | |
| JP2000205658A (en) | Combustion equipment | |
| KR200202937Y1 (en) | Heat Exchanger Having The Many Route Condensing Gas Boiler | |
| JP3880220B2 (en) | Combustion equipment | |
| JP2002213825A (en) | Water heater |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A621 | Written request for application examination |
Free format text: JAPANESE INTERMEDIATE CODE: A621 Effective date: 20070911 |
|
| A977 | Report on retrieval |
Free format text: JAPANESE INTERMEDIATE CODE: A971007 Effective date: 20081106 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20081118 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20090119 |
|
| A131 | Notification of reasons for refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A131 Effective date: 20090224 |
|
| A521 | Written amendment |
Free format text: JAPANESE INTERMEDIATE CODE: A523 Effective date: 20090304 |
|
| TRDD | Decision of grant or rejection written | ||
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 Effective date: 20090407 |
|
| A01 | Written decision to grant a patent or to grant a registration (utility model) |
Free format text: JAPANESE INTERMEDIATE CODE: A01 |
|
| A61 | First payment of annual fees (during grant procedure) |
Free format text: JAPANESE INTERMEDIATE CODE: A61 Effective date: 20090421 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120501 Year of fee payment: 3 |
|
| R150 | Certificate of patent or registration of utility model |
Free format text: JAPANESE INTERMEDIATE CODE: R150 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120501 Year of fee payment: 3 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120501 Year of fee payment: 3 |
|
| S533 | Written request for registration of change of name |
Free format text: JAPANESE INTERMEDIATE CODE: R313533 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20120501 Year of fee payment: 3 |
|
| R350 | Written notification of registration of transfer |
Free format text: JAPANESE INTERMEDIATE CODE: R350 |
|
| FPAY | Renewal fee payment (event date is renewal date of database) |
Free format text: PAYMENT UNTIL: 20150501 Year of fee payment: 6 |
|
| R250 | Receipt of annual fees |
Free format text: JAPANESE INTERMEDIATE CODE: R250 |
|
| LAPS | Cancellation because of no payment of annual fees |