JP2006057988A - Heat exchanger for recovering waste heat of combustion type heat source machine - Google Patents

Heat exchanger for recovering waste heat of combustion type heat source machine Download PDF

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JP2006057988A
JP2006057988A JP2005016465A JP2005016465A JP2006057988A JP 2006057988 A JP2006057988 A JP 2006057988A JP 2005016465 A JP2005016465 A JP 2005016465A JP 2005016465 A JP2005016465 A JP 2005016465A JP 2006057988 A JP2006057988 A JP 2006057988A
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water
header
pipe
stainless steel
heat exchanger
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Koichi Kanezaki
幸一 金▲崎▼
Hiroshi Kitanishi
博 北西
Masazumi Iwanaga
昌純 岩永
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Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat exchanger for recovering waste heat that has high corrosion resistance against dew condensation water of combustion exhaust gas and has low pressure loss. <P>SOLUTION: A plurality of stainless steel plate fins 7 are arranged in parallel at a predetermined interval between stainless steel side plates 6a and 6b, stainless steel sheath pipes 8 are inserted into openings among the side plates 6a and 6b and the plate fins 7 so that both ends of each sheath pipe 8 slightly project from the side plates 6a and 6b. Inside the sheath pipes 8, a copper-made U-shaped water flow pipe 9 of which outer diameter is a size smaller than the inner diameter of the sheath pipes 8 is inserted into the sheath pipes 8 as a pair of inflow and outflow pipes from one side, a copper-made inflow header 10 is brazed to the inflow side of the end, and a copper-made outflow header 11 is brazed to the outflow side. Thus, a part through which combustion exhaust gas passes is entirely made of stainless steel, so that the corrosion resistance is high. Water can be carried to the heat exchanger for recovering waste heat in parallel with a plurality of routes, so that the water carry resistance can be reduced. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

本発明は、給湯や温水暖房に用いる燃焼式熱源機の排気通路に組み込み、燃焼排気に含まれる廃熱の利用を行なう廃熱回収用熱交換器に関するものである。   The present invention relates to a heat exchanger for recovering waste heat that is incorporated in an exhaust passage of a combustion heat source unit used for hot water supply or hot water heating and uses waste heat contained in combustion exhaust.

従来、この種の廃熱回収用熱交換器は、排気中の窒素酸化物が溶け込んだ酸性の結露水にさらされるため、加工性の良い銅を直接使用することはできないので、耐食性の高いステンレス鋼製の側板とプレートフィンにステンレス鋼製受熱管を貫通させ、その中に銅製通水管を挿入し、端部を銅製のＵ字管で接続している（例えば、特許文献１参照）。   Conventionally, this type of heat exchanger for waste heat recovery is exposed to acidic dew condensation water in which nitrogen oxides in the exhaust are dissolved, so copper with good workability cannot be used directly. A stainless steel heat receiving pipe is passed through a steel side plate and a plate fin, a copper water pipe is inserted therein, and ends thereof are connected by a copper U-shaped pipe (for example, see Patent Document 1).

図６は、特許文献１に記載された従来の廃熱回収用熱交換器を示すものであり、図７は主要部の断面図である。図６、７に示すように、ステンレス鋼製側板１と、ステンレス鋼製プレートフィン２と、ステンレス鋼製受熱管３と、銅製通水管４と、銅製Ｕ字管５から構成されている。
特開２０００−１４６３０５号公報 FIG. 6 shows a conventional waste heat recovery heat exchanger described in Patent Document 1, and FIG. 7 is a cross-sectional view of the main part. As shown in FIGS. 6 and 7, it is composed of a stainless steel side plate 1, a stainless steel plate fin 2, a stainless steel heat receiving pipe 3, a copper water pipe 4, and a copper U-shaped pipe 5.
JP 2000-146305 A

しかしながら、前記従来の構成は、１つの通水経路で廃熱を利用した熱交換を行なうという発想のもとになされたもので、１つの通水経路を構成するために、通水管の端部を多くの銅製Ｕ字管で接合する必要があり、この接合作業に時間がかかる。また、入水から出水までに多くの曲りが存在するため、熱交換器の通水抵抗が大きくなってしまい、低水圧時の流量が低下するという課題を有していた。   However, the conventional configuration was made based on the idea of performing heat exchange using waste heat in one water passage, and in order to construct one water passage, the end of the water pipe Must be joined with many copper U-shaped tubes, and this joining work takes time. In addition, since there are many bends from entry to exit, there is a problem that the flow resistance at the time of low water pressure decreases because the water flow resistance of the heat exchanger increases.

本発明は、前記従来の課題を解決するもので、燃焼排気の結露水に対する耐食性を高めるとともに、加工性がよく、かつ低圧損の廃熱回収用熱交換器を提供することを目的とする。   SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a heat exchanger for recovering waste heat having high workability and low pressure loss while improving the corrosion resistance against dew condensation water of combustion exhaust.

前記従来の課題を解決するために、本発明の廃熱回収用熱交換器は、ステンレス鋼製の側板と、前記側板間に配列したステンレス鋼製のプレートフィンと、前記側板とプレートフィンに設けた開口部に貫通させて並設したステンレス鋼製の鞘管と、前記鞘管に内通させ入水口と出水口を設けた複数の銅製通水管と、前記通水管の入水口を集合させ１つの入水経路を形成する入水ヘッダーと、前記通水管の出水口を集合させ１つの出水経路を形成する出水ヘッダーとを備え、前記通水管は受熱部に対し２重管構造とし、前記入水ヘッダー、及び出水ヘッダーを介して並列の熱交換経路を形成するようにしたものである。   In order to solve the conventional problem, a heat exchanger for waste heat recovery according to the present invention is provided on a stainless steel side plate, a stainless steel plate fin arranged between the side plates, and the side plate and the plate fin. A stainless steel sheath pipe that is provided in parallel through the opening, a plurality of copper water pipes that are internally passed through the sheath pipe and provided with a water inlet and a water outlet, and a water inlet of the water pipe is assembled 1 A water inlet header that forms two water inlet paths, and a water outlet header that gathers the water outlets of the water pipes to form one water outlet path, and the water pipe has a double pipe structure with respect to the heat receiving portion. In addition, a parallel heat exchange path is formed through the water discharge header.

この構成によって、燃焼排気との接触部分である受熱部はステンレス鋼製の鞘管で構成し、その内通部に銅製の通水管を挿入して通水経路を形成した２重管構造としているため、燃焼時の通水により生じる排ガス成分を含む結露水で銅製の通水管が侵されるという事態は回避でき、かつ通水管を入水口と出水口に対して並列に接続し複数の通水経路を経由して通水する構成としたことにより、廃熱回収用熱交換器内における通水抵抗を小さくすることができ、低水圧時の流量低下という問題も軽減できる。さらに、通水管を並列に接続し入水口と出水口をそれぞれ集合させた通水経路構成とすることにより、通水管端部における接合作業を大幅に軽減することができ、通水管の配設構成も簡素化され、加工性の向上が図れるものである。   With this configuration, the heat receiving portion which is a contact portion with the combustion exhaust is constituted by a stainless steel sheath tube, and a double water pipe structure is formed in which a water passage is formed by inserting a copper water passage into the inner passage portion. Therefore, it is possible to avoid the situation where the copper water pipe is eroded by the dew condensation water containing exhaust gas components generated by the water flow during combustion, and the water pipe is connected in parallel to the water inlet and the water outlet. By adopting a configuration that allows water to pass through, the water flow resistance in the waste heat recovery heat exchanger can be reduced, and the problem of a decrease in flow rate at low water pressure can be reduced. Furthermore, by connecting the water pipes in parallel and collecting the water inlets and outlets together, it is possible to greatly reduce the joining work at the ends of the water pipes. This simplifies the process and improves the workability.

本発明の廃熱回収用熱交換器は、燃焼排気の結露水に対する耐食性を高めるとともに、低圧損の熱交換経路を実現し、かつ加工性の向上を図ることができる。   The waste heat recovery heat exchanger according to the present invention can improve the corrosion resistance against the dew condensation water of the combustion exhaust gas, realize a heat exchange path with a low pressure loss, and improve workability.

第１の発明は、ステンレス鋼製の側板と、前記側板間に配列したステンレス鋼製のプレートフィンと、前記側板とプレートフィンに設けた開口部に貫通させて並設したステンレス鋼製の鞘管と、前記鞘管に内通させ入水口と出水口を設けた複数の銅製通水管と、前記通水管の入水口を集合させ１つの入水経路を形成する入水ヘッダーと、前記通水管の出水口を集合させ１つの出水経路を形成する出水ヘッダーとを備え、前記通水管は受熱部に対し２重管構造とし、前記入水ヘッダー、及び出水ヘッダーを介して並列の熱交換経路を形成したことを特徴とするもので、燃焼排気との接触部分である受熱部はステンレス鋼製の鞘管で構成し、その内通部に銅製の通水管を挿入して通水経路を形成した２重管構造としているため、燃焼時の通水により生じる排ガス成分を含む結露水で銅製の通水管が侵されるという事態は回避でき、かつ通水管を入水口と出水口に対して並列に接続し複数の通水経路を経由して通水する構成としたことにより、廃熱回収用熱交換器内における通水抵抗を小さくすることができ、低水圧時の流量低下という問題も軽減できる。さらに、通水管を並列に接続し入水口と出水口をそれぞれ集合させた通水経路構成とすることにより、通水管端部における接合作業を大幅に軽減することができ、通水管の配設構成も簡素化され、加工性の向上が図れるものである。   A first aspect of the present invention is a stainless steel side tube, a stainless steel plate fin arranged between the side plates, and a stainless steel sheath tube arranged in parallel through an opening provided in the side plate and the plate fin. A plurality of copper water pipes that are internally passed through the sheath pipe and provided with a water inlet and a water outlet; a water inlet header that collects the water inlets of the water pipe to form one water inlet path; and a water outlet of the water pipe The water flow pipe has a double pipe structure with respect to the heat receiving part, and a parallel heat exchange path is formed through the water inlet header and the water outlet header. The heat receiving part, which is the contact part with the combustion exhaust, is composed of a stainless steel sheath pipe, and a copper pipe is inserted into the inner passage to form a water pipe. Due to the structure, it is possible to A configuration in which the water pipe made of copper is damaged by the condensed water containing exhaust gas components that are generated, and the water pipe is connected in parallel to the water inlet and outlet to allow water to flow through multiple water paths. As a result, the water flow resistance in the waste heat recovery heat exchanger can be reduced, and the problem of a decrease in flow rate at low water pressure can be reduced. Furthermore, by connecting the water pipes in parallel and collecting the water inlets and outlets together, it is possible to greatly reduce the joining work at the ends of the water pipes. This simplifies the process and improves the workability.

第２の発明は、通水管を略Ｕ字形とし、片側に入水口と出水口を設け、前記入水口、及び出水口を集合する入水ヘッダー、及び出水ヘッダーを片方に集約させることを特徴とするもので、燃焼排気の廃熱回収面積を確保しつつ通水経路の圧損を軽減することができ、かつ、ろう付け箇所を増やすことなく、熱源機へ組み込んだ際、器具の前面に入水、出水ヘッダーを配置することが可能となって、合理的な配管構成を確保することができる。   The second invention is characterized in that the water pipe is substantially U-shaped, a water inlet and a water outlet are provided on one side, and the water inlet and the water inlet header that collects the water outlet and the water outlet header are concentrated on one side. Therefore, it is possible to reduce the pressure loss of the water flow path while securing the waste heat recovery area of the combustion exhaust, and when it is installed in the heat source machine without increasing the number of brazing points, A header can be arranged, and a reasonable piping configuration can be secured.

第３の発明は、プレートフィンにバーリング加工を施した開口部を設け、該開口部にステンレス鋼製の鞘管を貫通させ、その鞘管の内通部に通水管を挿入し、前記通水管を拡管加工することで側板、プレートフィン、鞘管、通水管を一体に接合するようにしたことを特徴とするもので、ろう付けや溶接による接合手段を用いることなく、短時間で確実に接合ができるため、加工性が向上するとともに、プレートフィン、鞘管、通水管の密着が良くなり熱の伝達も効率よく行うことができる。   According to a third aspect of the present invention, the plate fin is provided with an opening that is subjected to burring, a stainless steel sheath pipe is passed through the opening, and a water pipe is inserted into the inner passage of the sheath pipe. The side plate, plate fin, sheath pipe, and water pipe are joined together by expanding the pipe, and it is possible to join reliably in a short time without using joining means by brazing or welding. Therefore, workability is improved and adhesion between the plate fin, the sheath pipe and the water pipe is improved, and heat can be transmitted efficiently.

第４の発明は、プレートフィンのバーリング高さをプレートフィンの配列間隔と略同一にし、隙間なく配列することで、通水管が受熱部に対し３重管構造となるようにしたことを特徴とするもので、鞘管の表面をプレートフィンのバーリングにより覆うことで、燃焼排気の結露水に対する耐食性を一層向上させることができる。   The fourth invention is characterized in that the burring height of the plate fins is made substantially the same as the arrangement interval of the plate fins and arranged without gaps so that the water flow pipe has a triple pipe structure with respect to the heat receiving portion. Therefore, by covering the surface of the sheath tube with the burring of the plate fin, the corrosion resistance against the dew condensation water of the combustion exhaust gas can be further improved.

第５の発明は、入水ヘッダーを複数の通水管の入水口を集合させ、複数の入水経路を形成するように配置したことを特徴とするもので、熱交換が必要な部分にだけ通水できるようになり、熱源機を部分的に燃焼させた場合でも効率よく廃熱回収ができる。   The fifth invention is characterized in that the inlet header is arranged so that the inlets of a plurality of water pipes are gathered to form a plurality of water inlet paths, and water can be passed only to a portion requiring heat exchange. Thus, even when the heat source machine is partially burned, waste heat can be efficiently recovered.

第６の発明は、出水ヘッダーを複数の通水管の出水口を集合させ、複数の出水経路を形成するように配置したことを特徴とするもので、熱交換が必要な部分にだけ通水できるようになり、熱源機を部分的に燃焼させた場合でも効率よく廃熱回収ができる。   The sixth invention is characterized in that the outlet header is arranged so that outlets of a plurality of water pipes are gathered to form a plurality of water outlet paths, and water can be passed only to a portion requiring heat exchange. Thus, even when the heat source machine is partially burned, waste heat can be efficiently recovered.

第７の発明は、ステンレス鋼として、ＳＵＳ３０４、ＳＵＳ３０４Ｌ、ＳＵＳ３１６、ＳＵＳ３１６Ｌ等のオースナイト系ステンレス鋼を用いたことを特徴とするもので、燃焼排気の結露水に接する部分の耐食性を高めるとともに、安価で汎用性を有する廃熱回収用熱交換器を提供することができる。   The seventh invention is characterized by using an austenitic stainless steel such as SUS304, SUS304L, SUS316, SUS316L, etc. as the stainless steel, which increases the corrosion resistance of the portion in contact with the dew condensation water of the combustion exhaust gas and is inexpensive. The waste heat recovery heat exchanger having versatility can be provided.

第８の発明は、入水ヘッダーの入水口と出湯ヘッダーの出水口の取り出しを逆向き方向とすることを特徴とするもので、入水ヘッダーと出湯ヘッダーに接続された複数の通水管の通水抵抗が均一になり、流れる水の量が均一になり、燃焼排気ガスの廃熱回収が効率よくできる。   The eighth invention is characterized in that the water outlet of the water inlet header and the water outlet of the hot water header are taken out in opposite directions, and the water flow resistance of a plurality of water pipes connected to the water inlet header and the hot water header. Becomes uniform, the amount of flowing water becomes uniform, and waste heat recovery of combustion exhaust gas can be efficiently performed.

第９の発明は、入水ヘッダーの入水口と出湯ヘッダーの出水口を各々の中央部に配置することを特徴するもので、入水ヘッダーと出湯ヘッダーに接続された複数の通水管の通水抵抗は中央から両サイド方向に通水抵抗が大きくなり、通水管に流れる通水量も中央から両サイドに向かって減少する。排気ガスの流れも中央から両サイドに向けて減少するため、排気ガスの流れの多い中央部の通水管への通水量が多く流れることになり、燃焼排気ガスの廃熱回収が効率よくできる。   The ninth invention is characterized in that a water inlet of a water inlet header and a water outlet of a hot water header are arranged in the center of each, and the water flow resistance of a plurality of water pipes connected to the water inlet header and the hot water header is Water flow resistance increases from the center to both sides, and the amount of water flowing through the water pipe decreases from the center toward both sides. Since the flow of the exhaust gas also decreases from the center toward both sides, a large amount of water flows to the central water flow pipe where the flow of exhaust gas is large, and the waste heat recovery of the combustion exhaust gas can be efficiently performed.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。   Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

（実施の形態１）
図１は、本発明の第１の実施の形態における廃熱回収用熱交換器の上面図、図２は同廃熱回収用熱交換器の主要部の断面図、図３は同廃熱回収用熱交換器を組み込んだガス給湯機の全体構成図である。 (Embodiment 1)
FIG. 1 is a top view of a heat exchanger for waste heat recovery according to the first embodiment of the present invention, FIG. 2 is a cross-sectional view of the main part of the heat exchanger for waste heat recovery, and FIG. It is a whole block diagram of the gas water heater incorporating the heat exchanger for operation.

図１において、ステンレス鋼製側板６ａ、６ｂの間にはステンレス鋼製プレートフィン７が所定の間隔を有して複数枚並設されており、そのプレートフィン７の適所には側板６ａと６ｂを貫通してステンレス綱製の鞘管８が並設できるように所定の数だけ開口が設けてある。ステンレス鋼製鞘管８は側板６ａ、６ｂから両端部がわずかに突出するよう開口部に挿入される。鞘管８の内部には鞘管８の内径よりも一回り外径が小さい銅製のＵ字形通水管９が挿入される。通水管９は入水側と出水側のペアとなる鞘管８に片側から挿入され、入水口及び出水口となる端部は鞘管８より外部にでる長さとしてある。   In FIG. 1, a plurality of stainless steel plate fins 7 are arranged in parallel between the stainless steel side plates 6a and 6b at a predetermined interval, and the side plates 6a and 6b are disposed at appropriate positions of the plate fins 7, respectively. A predetermined number of openings are provided so that stainless steel sheath pipes 8 can be juxtaposed. The stainless steel sheath tube 8 is inserted into the opening so that both ends slightly protrude from the side plates 6a and 6b. Inside the sheath tube 8, a copper U-shaped water conduit 9 having an outer diameter slightly smaller than the inner diameter of the sheath tube 8 is inserted. The water pipe 9 is inserted from one side into the sheath pipe 8 that forms a pair of the water inlet side and the water outlet side, and the end part that becomes the water inlet and the water outlet has a length that extends outside the sheath pipe 8.

図２に示すように、側板６ａ、６ｂとプレートフィン７の開口の周囲はバーリング加工されており、通水管９を挿入後、拡管加工することで、側板６ａ、６ｂとプレートフィン７は通水管９、鞘管８と一体に接合される。また、通水管９の入水側には銅製の入水ヘッダー１０がろう付けされ、出水側には銅製の出水ヘッダー１１がろう付けされる。   As shown in FIG. 2, the peripheries of the openings of the side plates 6a and 6b and the plate fins 7 are burring processed, and the side plates 6a and 6b and the plate fins 7 are connected to the water pipes by inserting the water pipes 9 and then expanding the pipes. 9. It is integrally joined with the sheath tube 8. Further, a copper incoming header 10 is brazed to the incoming side of the water pipe 9, and a copper outgoing header 11 is brazed to the outgoing side.

以上のように、本実施の形態においては通水管９をＵ字形にし鞘管８に挿入後、拡管加工でプレートフィン７、側板６ａ、６ｂと一体に接合できるため、非常に短時間で確実に接合ができるとともに、プレートフィン７、鞘管８、通水管９の密着も良くなるため、熱の伝達も効率よく行うことができる。   As described above, in the present embodiment, since the water pipe 9 is formed in a U shape and inserted into the sheath pipe 8, the pipe fin 7 and the side plates 6a and 6b can be joined together by pipe expansion processing, so that it can be reliably performed in a very short time. While being able to join, since the close_contact | adherence of the plate fin 7, the sheath pipe 8, and the water flow pipe 9 also becomes good, heat transfer can also be performed efficiently.

次に、図３を用いて廃熱回収用熱交換器１２をガス給湯機に組み込んだ構成について説明する。   Next, a configuration in which the waste heat recovery heat exchanger 12 is incorporated in a gas water heater will be described with reference to FIG.

図３において、廃熱回収用熱交換器１２は主熱交換器１３の上部の排気通路内に組み込まれ、バーナ１４で発生した燃焼熱により主熱交換器１３が加熱され、その後、主熱交換器１３を通った排気は側板６ａ、６ｂ間を通るよう導かれ、そこでプレートフィン７及び鞘管８を介して受熱し通水管９内の水と熱交換される。また、給水は入水ヘッダー１０に接続され、この入水ヘッダー１０を介して複数の通水管９に分岐して並列に流れ、主熱交換器１３の入水側に接続された出水ヘッダー１１で集合されて主熱交換器１３に流れる。給湯が使用された場合、給水は入水ヘッダー１０に入りそこから各通水管９を通過し出水ヘッダー１１より出た後、主熱交換器１３を通って給湯栓に出湯される。   In FIG. 3, the waste heat recovery heat exchanger 12 is incorporated in the exhaust passage above the main heat exchanger 13, the main heat exchanger 13 is heated by the combustion heat generated in the burner 14, and then the main heat exchange is performed. The exhaust gas passing through the vessel 13 is guided to pass between the side plates 6 a and 6 b, where it receives heat through the plate fins 7 and the sheath tube 8 and exchanges heat with the water in the water flow tube 9. Further, the water supply is connected to the water inlet header 10, branches to the plurality of water pipes 9 through the water inlet header 10, flows in parallel, and gathers at the water outlet header 11 connected to the water inlet side of the main heat exchanger 13. It flows to the main heat exchanger 13. When hot water is used, the water enters the incoming header 10, passes through the water pipes 9 from there, exits from the outlet header 11, and is discharged to the hot water tap through the main heat exchanger 13.

以上のように、本実施の形態では、廃熱回収用熱交換器１２の排気が通過する部分はすべて耐食性が高く、一般的に管材等が入手しやすいステンレス鋼のオースナイト系ＳＵＳ３０４を使用しているため、酸性の結露水に腐食されることがない。   As described above, in this embodiment, the exhaust gas passing through the exhaust heat recovery heat exchanger 12 has a high corrosion resistance and is generally made of stainless steel austenitic SUS304, which is easily available for pipes and the like. Therefore, it is not corroded by acidic condensed water.

なお、ステンレス鋼としてはオースナイト系ＳＵＳ３０４の他、さらに耐食性の高いＳＵＳ３０４Ｌ、ＳＵＳ３１６、ＳＵＳ３１６Ｌ等を使用してもよい。   As stainless steel, SUS304L, SUS316, SUS316L or the like having higher corrosion resistance may be used in addition to austenitic SUS304.

また、通常、廃熱回収用熱交換器を組み込まないガス給湯機に比べると廃熱回収用熱交換器の分だけ給湯の通水抵抗が増してしまうが、本実施の形態では、入水側に入水ヘッダー１０、出水側に出水ヘッダー１１を設け、複数の経路で並列に廃熱回収用熱交換器１２に通水することができるため、通水抵抗を小さくすることができる。   In addition, compared with a gas water heater that does not incorporate a waste heat recovery heat exchanger, the resistance to hot water flow increases by the amount of the waste heat recovery heat exchanger. Since the water discharge header 11 is provided on the water intake header 10 and the water discharge side, and water can be passed through the waste heat recovery heat exchanger 12 in parallel through a plurality of paths, the water flow resistance can be reduced.

さらに、本実施の形態では、通水管９をＵ字形にし、入水ヘッダー１０と出水ヘッダー１１を廃熱回収用熱交換器１２の片側に配置しているため、ガス給湯機に組み込む場合、前面側にヘッダーを配置でき組み立て性がよい。   Furthermore, in the present embodiment, the water pipe 9 is U-shaped, and the water inlet header 10 and the water outlet header 11 are arranged on one side of the heat exchanger 12 for waste heat recovery. The header can be placed on the top, making it easy to assemble.

（実施の形態２）
図４は、本発明の第２の実施の形態における廃熱回収用熱交換器の主要部の断面図である。実施の形態１と異なる点はプレートフィン１６のバーリング加工高さとプレートフィン１６の配列間隔を略同一にし、プレートフィン１６を鞘管８の露出部がないように隙間なく配置したところである。 (Embodiment 2)
FIG. 4 is a cross-sectional view of the main part of the heat exchanger for waste heat recovery in the second embodiment of the present invention. The difference from the first embodiment is that the burring height of the plate fins 16 and the arrangement interval of the plate fins 16 are substantially the same, and the plate fins 16 are arranged without a gap so that there is no exposed portion of the sheath tube 8.

これにより、鞘管８の表面はプレートフィン７のバーリングにより被覆された状態となるため、通水管９は受熱部に対し３重構造となり、酸性の結露水に対する耐食性を一層向上させることができる。   Thereby, since the surface of the sheath tube 8 is covered with the burring of the plate fin 7, the water flow tube 9 has a triple structure with respect to the heat receiving portion, and the corrosion resistance against acidic dew condensation water can be further improved.

（実施の形態３）
図５は、本発明の第３の実施の形態における廃熱回収用熱交換器の上面図である。実施の形態１と異なる点は入水ヘッダーを２分割し、片側の入水ヘッダー１７には開閉弁１９を取り付けているところであり、全ての通水管に水を流すか、入水ヘッダー１８に接続された通水管にのみ水を流すか選択することが可能となっているところである。 (Embodiment 3)
FIG. 5 is a top view of a heat exchanger for waste heat recovery in the third embodiment of the present invention. The difference from the first embodiment is that the incoming header is divided into two parts, and an on-off valve 19 is attached to the incoming header 17 on one side, and water is allowed to flow through all the water pipes or through the inlet header 18. It is now possible to select whether water flows only in the water pipe.

これにより、負荷が少なくバーナーが半面以下しか燃焼していない場合には入水ヘッダー１７の開閉弁１９を閉とすることで、バーナーの燃焼している側にだけ水を流すことができ、バーナーの非燃焼部を流れる空気によって熱交換器内の水が冷却されることがなくなり、部分負荷時にも高い熱効率を得ることができる。   As a result, when the load is low and the burner is burning only half or less, the on / off valve 19 of the water inlet header 17 is closed, so that water can flow only to the burner burning side. Water in the heat exchanger is not cooled by the air flowing through the non-combustion part, and high thermal efficiency can be obtained even during partial load.

なお、出水ヘッダーを分割しても上記と同一の効果を得ることが可能である。   Even if the flood header is divided, the same effect as described above can be obtained.

（実施の形態４）
図８は、本発明の第４の実施の形態における廃熱回収用熱交換器の上面図である。実施の形態１と異なる点は入水ヘッダー１０の入水口と出湯ヘッダー１１の出水口の取り出しを逆向き方向としたところである。 (Embodiment 4)
FIG. 8 is a top view of a waste heat recovery heat exchanger according to the fourth embodiment of the present invention. The difference from the first embodiment is that the water inlet of the water inlet header 10 and the water outlet of the hot water header 11 are taken out in opposite directions.

これにより、入水ヘッダー１０と出湯ヘッダー１１に接続された複数の通水管９の通水抵抗が均一になり、流れる水の量が均一になることで、燃焼排気ガスの廃熱回収が効率よくできる。   Thereby, the water flow resistance of the plurality of water pipes 9 connected to the water inlet header 10 and the hot water header 11 becomes uniform, and the amount of flowing water becomes uniform, so that waste heat recovery of the combustion exhaust gas can be efficiently performed. .

（実施の形態５）
図９は、本発明の第５の実施の形態における廃熱回収用熱交換器の上面図である。実施の形態１と異なる点は入水ヘッダー１０の入水口と出湯ヘッダー１１の出水口を各々の中央部に配置したところである。 (Embodiment 5)
FIG. 9 is a top view of a waste heat recovery heat exchanger according to the fifth embodiment of the present invention. The difference from the first embodiment is that the water inlet of the water inlet header 10 and the water outlet of the hot water header 11 are arranged at the center of each.

これにより、入水ヘッダー１０と出湯ヘッダー１１に接続された複数の通水管９の通水抵抗は中央から両サイド方向に通水抵抗が大きくなり、通水管９に流れる通水量も中央から両サイドに向かって減少する。排気ガスの流れも中央から両サイドに向けて減少するため、排気ガスの流れの多い中央部の通水管９への通水量が多く流れることになり、燃焼排気ガスの廃熱回収が効率よくできる。   Thereby, the water flow resistance of the plurality of water pipes 9 connected to the water inlet header 10 and the hot water header 11 increases from the center to both sides, and the amount of water flowing through the water pipe 9 also flows from the center to both sides. It decreases toward. Since the flow of exhaust gas also decreases from the center toward both sides, a large amount of water flows into the central water flow pipe 9 where the flow of exhaust gas is large, and waste heat recovery of combustion exhaust gas can be efficiently performed. .

以上のように、本発明にかかる燃焼式熱源機の廃熱回収用熱交換器は、製造が容易で、かつ低圧損が可能となるので、ガスや石油を燃料とする風呂給湯機や給湯暖房機等の用途にも適用できる。   As described above, the waste heat recovery heat exchanger of the combustion heat source apparatus according to the present invention is easy to manufacture and can be subjected to low pressure loss. Therefore, a bath water heater or a hot water heater that uses gas or oil as fuel. It can also be used for machine applications.

本発明の実施の形態１における廃熱回収用熱交換器の上面図The top view of the heat exchanger for waste heat recovery in Embodiment 1 of the present invention 同廃熱回収用熱交換器主要部の断面図Sectional view of the main part of the heat exchanger for waste heat recovery 同廃熱回収用熱交換器を組み込んだガス給湯機の全体構成図Overall configuration diagram of a gas water heater incorporating the waste heat recovery heat exchanger 本発明の実施の形態２における廃熱回収用熱交換器主要部の断面図Sectional drawing of the heat exchanger main part for waste heat recovery in Embodiment 2 of this invention 本発明の実施の形態３における廃熱回収用熱交換器の上面図Top view of heat exchanger for waste heat recovery in Embodiment 3 of the present invention 従来の廃熱回収用熱交換器の斜視図A perspective view of a conventional heat exchanger for waste heat recovery 従来の廃熱回収用熱交換器主要部の断面図Sectional view of the main part of a conventional heat exchanger for waste heat recovery 本発明の実施の形態４における廃熱回収用熱交換器の上面図Top view of waste heat recovery heat exchanger in Embodiment 4 of the present invention 本発明の実施の形態５における廃熱回収用熱交換器の上面図Top view of waste heat recovery heat exchanger according to Embodiment 5 of the present invention

符号の説明Explanation of symbols

６ａ 側板
６ｂ 側板
７、１６ プレートフィン
８ 鞘管
９ 通水管
１０、１７、１８ 入水ヘッダー
１１ 出水ヘッダー
１２ 廃熱回収用熱交換器
１３ 主熱交換器
１４ バーナ
１５ ファン
１９ 開閉弁 6a Side plate 6b Side plate 7, 16 Plate fin 8 Sheath tube 9 Water pipe 10, 17, 18 Incoming header 11 Outlet header 12 Waste heat recovery heat exchanger 13 Main heat exchanger 14 Burner 15 Fan 19 Open / close valve

Claims (9)

ステンレス鋼製の側板と、前記側板間に配列したステンレス鋼製のプレートフィンと、前記側板とプレートフィンに設けた開口部に貫通させて並設したステンレス鋼製の鞘管と、前記鞘管に内通させ入水口と出水口を設けた複数の銅製通水管と、前記通水管の入水口を集合させ１つの入水経路を形成する入水ヘッダーと、前記通水管の出水口を集合させ１つの出水経路を形成する出水ヘッダーとを備え、前記通水管は受熱部に対し２重管構造とし、前記入水ヘッダー、及び出水ヘッダーを介して並列の熱交換経路を形成することを特徴とする燃焼式熱源機の廃熱回収用熱交換器。 A stainless steel side plate, a stainless steel plate fin arranged between the side plates, a stainless steel sheath tube arranged in parallel through an opening provided in the side plate and the plate fin, and the sheath tube A plurality of copper water pipes having internal water inlets and water outlets, a water inlet header that gathers the water inlets of the water pipes to form one water inlet path, and a water outlet that gathers the water outlets of the water pipes. And a water discharge header that forms a path, wherein the water pipe has a double pipe structure with respect to the heat receiving portion, and a parallel heat exchange path is formed through the water inlet header and the water outlet header. Heat exchanger for waste heat recovery of heat source equipment. 通水管は略Ｕ字形とし、片側に入水口と出水口を設け、前記入水口、及び出水口を集合する入水ヘッダー、及び出水ヘッダーを片方に集約させた請求項１記載の燃焼式熱源機の廃熱回収用熱交換器。 The combustion-type heat source device according to claim 1, wherein the water pipe is substantially U-shaped, and has a water inlet and a water outlet on one side, and the water inlet, the water inlet header that collects the water outlet, and the water outlet header are concentrated on one side. Waste heat recovery heat exchanger. ステンレス鋼製の側板とプレートフィンにバーリング加工を施した開口部を設け、該開口部にステンレス鋼製の鞘管を貫通させ、その鞘管の内通部に通水管を挿入し、前記通水管を拡管加工することで側板、プレートフィン、鞘管、通水管を一体に接合するようにした請求項１または２に記載の燃焼式熱源機の廃熱回収用熱交換器。 A stainless steel side plate and a plate fin are provided with an opening that is subjected to burring, and a stainless steel sheath pipe is passed through the opening, and a water pipe is inserted into the inner passage of the sheath pipe. The heat exchanger for recovering waste heat of a combustion heat source machine according to claim 1 or 2, wherein the side plate, the plate fin, the sheath pipe, and the water pipe are integrally joined by expanding the pipe. プレートフィンのバーリング高さをプレートフィンの配列間隔と略同一にし、隙間なく配列することで、通水管が受熱部に対し３重管構造となるようにした請求項３に記載の燃焼式熱源機の廃熱回収用熱交換器。 The combustion type heat source apparatus according to claim 3, wherein the burring height of the plate fins is substantially the same as the arrangement interval of the plate fins, and the water pipes have a triple pipe structure with respect to the heat receiving part by arranging them without gaps. Heat exchanger for waste heat recovery. 入水ヘッダーは複数の通水管の入水口を集合させ、複数の入水経路を形成することを特徴とする請求項１から４のいずれか１項に記載の燃焼式熱源機の廃熱回収用熱交換器。 The heat exchange for waste heat recovery of the combustion heat source machine according to any one of claims 1 to 4, wherein the water inlet header gathers water inlets of a plurality of water pipes to form a plurality of water inlet paths. vessel. 出水ヘッダーは複数の通水管の出水口を集合させ、複数の出水経路を形成することを特徴とする請求項１から４のいずれか１項に記載の燃焼式熱源機の廃熱回収用熱交換器。 The heat exchange for waste heat recovery of a combustion heat source machine according to any one of claims 1 to 4, wherein the water discharge header gathers water outlets of a plurality of water pipes to form a plurality of water discharge paths. vessel. ステンレス鋼として、ＳＵＳ３０４、ＳＵＳ３０４Ｌ、ＳＵＳ３１６、ＳＵＳ３１６Ｌ等のオースナイト系ステンレス鋼を用いた請求項１から６のいずれか１項に記載の燃焼式熱源機の廃熱回収用熱交換器。 The heat exchanger for waste heat recovery of a combustion heat source machine according to any one of claims 1 to 6, wherein an austenitic stainless steel such as SUS304, SUS304L, SUS316, or SUS316L is used as the stainless steel. 入水ヘッダーの入水口と出湯ヘッダーの出水口の取り出しを逆向き方向とすることを特徴とする請求項１から４のいずれか１項に記載の燃焼式熱源機の廃熱回収用熱交換器。 The heat exchanger for waste heat recovery of a combustion heat source apparatus according to any one of claims 1 to 4, wherein the water inlet of the water inlet header and the outlet of the hot water header are taken out in opposite directions. 入水ヘッダーの入水口と出湯ヘッダーの出水口を各々の中央部に配置することを特徴とする請求項１から４のいずれか１項に記載の燃焼式熱源機の廃熱回収用熱交換器。 The heat exchanger for waste heat recovery of a combustion-type heat source apparatus according to any one of claims 1 to 4, wherein a water inlet of a water inlet header and a water outlet of a hot water header are arranged in the center of each.
JP2005016465A 2004-07-22 2005-01-25 Heat exchanger for recovering waste heat of combustion type heat source machine Pending JP2006057988A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008232606A (en) * 2007-02-21 2008-10-02 Fuji Denki Thermosystems Kk Fluid heating device
CN105066216A (en) * 2015-08-10 2015-11-18 赵泽宇 Water diversion and collection machine having heating function
CN111141033A (en) * 2018-11-05 2020-05-12 宁波方太厨具有限公司 Wall-mounted furnace combustion control method and wall-mounted furnace applying same

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2008232606A (en) * 2007-02-21 2008-10-02 Fuji Denki Thermosystems Kk Fluid heating device
CN105066216A (en) * 2015-08-10 2015-11-18 赵泽宇 Water diversion and collection machine having heating function
CN111141033A (en) * 2018-11-05 2020-05-12 宁波方太厨具有限公司 Wall-mounted furnace combustion control method and wall-mounted furnace applying same

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