JP2004144366A

JP2004144366A - Hot water storage tank unit with built-in hot water heat exchanger

Info

Publication number: JP2004144366A
Application number: JP2002308253A
Authority: JP
Inventors: Masayuki Fujimoto; 藤本　雅之; Kazuhisa Morigami; 森上　和久
Original assignee: Matsushita Electric Industrial Co Ltd
Current assignee: Panasonic Holdings Corp
Priority date: 2002-10-23
Filing date: 2002-10-23
Publication date: 2004-05-20

Abstract

<P>PROBLEM TO BE SOLVED: To provide an economical appliance matched to Japanese housing conditions by miniaturizing a hot water heat exchanger for reheating a bath, which is built in an electric water heater and the like. <P>SOLUTION: This hot water storage tank unit comprises a hot water storage tank 2 for storing the hot water, the hot water heat exchanger 22 connected to the hot water storage tank 2 and having a heat exchange pipe 21 for circulating the hot water inside, and a circulating pump 27 for circulating the hot water in the hot water storage tank 2 in the hot water heat exchanger 22. At least one of a primary side and a secondary side of the heat exchange pipe is provided with a coiled part, and one of the primary side and the secondary side is passed through the inside of the coiled part to miniaturize the hot water heat exchanger 22. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、主として風呂加熱機能を備えた電気温水器関するものである。
【０００２】
【従来の技術】
従来のこの種の温水熱交換器内蔵型長湯タンクユニットは、図４（ａ）と図４（ｂ）に示すような構成となっていた。
【０００３】
以下、その構成を図に基づいて説明する。図４（ａ）において、３１は電気温水器の製品、３２は円筒形状の貯湯タンクで、給水管３３から給水が行われ、加熱ヒータ３４により温められた湯は出湯管３５から出湯される。３６は浴槽で、電気温水器３１と接続して浴槽３６への湯張りと追い焚きを行うための浴槽循環口３７を備えている。３８は往き配管、３９は戻り配管で、戻り配管３９と接続する電気温水器３１内部では、浴槽水の温度を検出する風呂サーミスタ４０、風呂循環ポンプ４１を介して浴槽水の追い焚きを行う電気ヒータ式熱交換器４２を通り、往き配管３８に戻るように接続されている。
【０００４】
図４（ｂ）は電気式熱交換器４２の代わりに貯湯タンク３２と接続し、追い焚き用ポンプ４３により貯湯タンク３２の湯を循環させ、内部に浴槽水を循環させるコイル状に巻いた１次側パイプ４４（ＩＮ側）と２次側パイプ４５（ＯＵＴ側）より為る熱交換パイプ４６を有した温水熱交換器４７を内蔵することにより追い焚きを行うタイプの電気温水器である。
【０００５】
【発明が解決しようとする課題】
近年、電気温水器の場合、風呂の保温機能だけでなく追い焚き機能への要望が高まっている。また、貯湯容量の大型化が進み製品の外形寸法は大きくなる傾向にあるが、日本の住宅事情を考えると設置床面積は小さい事が望まれている。
【０００６】
しかしながら、短時間で浴槽水を加熱し、使い勝手を良くしようとすると、ワット数の大きな電気ヒータが必要となりランニングコストが高くなる。
【０００７】
電気温水器を使用するユーザの期待としては、出来るだけ安価な深夜電力を効率的に利用してランニングコストでメリットを出そうとするものであり、単価の高い昼間電力を使用して浴槽水を加熱することは、深夜電力を利用して温めた湯の寄与率がゼロとなり、必ずしもユーザの期待に添ったものでないという課題を有していた。
【０００８】
そこで、深夜電力を利用して温めた湯を浴槽水と熱交換して追い焚きを行う温水熱交換器を備えたものは、高温の湯を利用することにより短時間で追い焚きすることが可能であるとともに、熱交換器を貯湯タンクから独立させて設けたタイプのものは、メンテナンス製に優れるが、十分な追い焚き能力を確保しようとすると熱交換器が大きくなり、結果として製品の設置床面積が大きくなるという課題を有していた。
【０００９】
一方、２次側パイプのみを温水熱交換器の外側に出す構成とすれば、温水熱交換器の容積を小さくできるが、２次側パイプが浴槽水の加熱に寄与せず追い焚き能力が低下してしまう。追い焚き能力が低下すると、温水熱交換器から貯湯タンクに戻る湯温が上昇し、貯湯タンクから温水熱交換器に湯を循環している追い焚き用ポンプの熱的ストレスが増加し、追い焚き用ポンプが劣化しやすくなるという課題を有していた。
【００１０】
【課題を解決するための手段】
本発明は上記課題を解決するために、湯を貯める貯湯タンクと、この貯湯タンクと接続し、内部に温水を循環させる熱交換パイプを有し、この熱交換パイプで浴槽水の加熱を行う温水熱交換器と、この温水熱交換器内に貯湯タンク内の湯を循環させる循環ポンプと、前記温水熱交換器に浴槽水を循環させる風呂循環ポンプとを備え、前記熱交換パイプの１次側あるいは２次側の少なくともどちらか一方はコイル状に巻いた部分を有し、１次側あるいは２次側のどちらか一方はコイル状に巻いた部分の内側を通る構成としている。
【００１１】
上記発明によれば、熱交換パイプの１次側あるいは２次側のどちらか一方がコイル巻きの内側を通ることにより、温水熱交換器を小型化することができ、日本の住宅事情に適した機器を提供することができる。
【００１２】
【発明の実施の形態】
本発明の請求項１に記載した温水熱交換器内蔵型貯湯タンクユニットは、湯を貯める貯湯タンクと、この貯湯タンクと接続し、内部に温水を循環させる熱交換パイプを有し、この熱交換パイプで浴槽水の加熱を行う温水熱交換器と、この温水熱交換器内に貯湯タンク内の湯を循環させる循環ポンプと、前記温水熱交換器に浴槽水を循環させる風呂循環ポンプとを備え、前記熱交換パイプの１次側あるいは２次側の少なくともどちらか一方はコイル状に巻いた部分を有し、１次側あるいは２次側のどちらか一方はコイル状に巻いた部分の内側を通る構成としている。
【００１３】
そして、熱交換パイプの１次側あるいは２次側のどちらか一方がコイル状に巻いた部分の内側を通ることにより、温水熱交換器を小型化することができ、さらに、温水熱交換器が小さいことにより熱交換パイプ近傍に沿って貯湯タンクの湯が循環することと、温水熱交換器表面からの放熱量を低減できることにより熱交換率を向上させることができ、経済的で日本の住宅事情にマッチした機器を提供することができる。
【００１４】
本発明の請求項２に記載した温水熱交換器内蔵型貯湯タンクユニットは、湯を貯める貯湯タンクと、この貯湯タンクと接続し、内部に温水を循環させる第１熱交換パイプと第２熱交換パイプを有し、この第１熱交換パイプと第２熱交換パイプの両方、あるいはどちらか一方で浴槽水の加熱を行う温水熱交換器と、この温水熱交換器内に貯湯タンク内の湯を循環させる循環ポンプと、前記温水熱交換器に浴槽水を循環させる風呂循環ポンプとを備え、前記第１熱交換パイプの１次側あるいは２次側の少なくともどちらか一方はコイル状に巻いた部分を有し、なおかつ１次側あるいは２次側のどちらか一方はコイル状に巻いた部分の内側を通るようにし、第２熱交換器の１次側と２次側の少なくともどちらか一方はコイル状に巻いた部分を有し、なおかつ１次側あるいは２次側のどちらか一方はコイル状に巻いた部分の内側を通るようにし、なおかつ１次側と２次側は共に第１熱交換器のコイル状に巻いた部分の内側を通る構成としている。
【００１５】
そして、第１熱交換パイプの１次側あるいは２次側のどちらか一方と、第２熱交換パイプの１次側と２次側は共に第１熱交換パイプのコイル状に巻いた部分の内側を通る構成としているので、２つの熱交換パイプを備えたとしても、温水熱交換器の高さ方向のみを大きくすればよく、１次熱交換パイプと２次熱交換パイプの各々の１次側同士と、２次側同士を一体的に接続すれば、電気温水器の設置床面積を大きくすることなしに温水熱交換器の能力を向上できる。
【００１６】
また、コイル状に巻いた熱交換パイプの内側を通る熱交換パイプが温水熱交換器内を循環する流れの抵抗となり、攪拌効果により熱交換率が向上し、さらに熱交換器を小型化することができる。
【００１７】
本発明の請求項３に記載した温水熱交換器内蔵型貯湯タンクユニットは、湯を貯める貯湯タンクと、この貯湯タンクと接続し、内部に温水を循環させる熱交換パイプを有し、この熱交換パイプで浴槽水の加熱を行う温水熱交換器と、この温水熱交換器内に貯湯タンク内の湯を循環させる循環ポンプと、前記温水熱交換器に浴槽水を循環させる風呂循環ポンプとを備え、前記熱交換パイプの１次側はコイル状に巻いた部分を有し、２次側は１次側のコイル状に巻いた部分の内側を通るようにし、前記温水熱交換器は貯湯タンクの上部より湯を取り入れ、この取り入れた湯を１次側と対向するように循環し、前記循環ポンプは温水熱交換器から貯湯タンクへの戻り側に接続する構成としているので、高温の湯が貯められている貯湯タンクの上部より取り入れた湯を、温度の下がった浴槽水の流れる１次側と対向するように循環させながら熱交換するので、より短時間で効率良く風呂の追い焚きが行えるとともに、熱交換率のさらなる向上によりさらに温水熱交換器を小型化することが可能となる。
【００１８】
また、１次側と熱交換した後の温度の下がった湯が流れる、温水熱交換器から貯湯タンクへの戻り側に循環ポンプを接続することにより、循環ポンプにかかる熱的ストレスが低減され、循環ポンプの劣化を防ぐことができる。
【００１９】
本発明の請求項４に記載した温水熱交換器内蔵型貯湯タンクユニットは、湯を貯める貯湯タンクと、この貯湯タンクと接続し、内部に温水を循環させる第１熱交換パイプと第２熱交換パイプを有し、この第１熱交換パイプと第２熱交換パイプの両方、あるいはどちらか一方で浴槽水の加熱を行う温水熱交換器と、この温水熱交換器内に貯湯タンク内の湯を循環させる循環ポンプと、前記温水熱交換器に浴槽水を循環させる風呂循環ポンプとを備え、前記第１熱交換パイプの１次側はコイル状に巻いた部分を有し、２次側は１次側のコイル状に巻いた部分の内側を通るようにし、第２熱交換パイプの１次側はコイル状に巻いた部分を有し、２次側は１次側のコイル状に巻いた部分の内側を通るようにし、なおかつ１次側と２次側は共に第１熱交換パイプの１次側のコイル状に巻いた部分の内側を通るようにし、前記温水熱交換器は貯湯タンクの上部より湯を取り入れ、この取り入れた湯を前記第１熱交換パイプの１次側および、第２熱交換パイプの１次側と対向するように循環し、前記循環ポンプは温水熱交換器から貯湯タンクへの戻り側に接続する構成としているので、高温の湯が貯められている貯湯タンクの上部より取り入れた湯を、第１熱交換パイプの１次側および第２熱交換パイプの１次側と対向するように循環させながら熱交換するので、効率良く熱交換することができる。そして、１次熱交換パイプと２次熱交換パイプの各々の１次側同士と、２次側同士を一体的に接続すれば、電気温水器の設置床面積を大きくすることなしに温水熱交換器の能力を向上できるだけでなく、温水熱交換器のさらなる小型化と、温水熱交換器から貯湯タンクへ戻る湯温をより低下でき、熱的ストレスによる循環ポンプの劣化が防げる。
【００２０】
また、最も高温の湯が循環する第２熱交換パイプを負荷の大きな浴槽水の追い焚き用とし、第１熱交換パイプを負荷の小さな他の機器に使用とすることも可能である。
【００２１】
【実施例】
以下、本発明の実施例について図面を用いて説明する。
【００２２】
（実施例１）
図１（ａ）は本発明の実施例１における温水熱交換器内蔵型貯湯タンクユニットのシステム構成図、図１（ｂ）は実施例１の温水熱交換器の部分断面図、図１（ｃ）は実施例１の温水熱交換器の断面図、図２は実施例１の製品の部分断面斜視図である。
【００２３】
図１（ａ）、図１（ｂ）、図１（ｃ）、図２において、１は電気温水器の製品で、２は円筒状の貯湯タンク、３は水道管、４は給水圧を減圧する減圧弁、５は給水管、６は貯湯タンク２内に臨むように取り付けられた加熱ヒータ、７は電動式の混合弁で貯湯タンク２と配管接続された給湯パイプ８と給水管５に配管接続されていて、設定温度に応じて内蔵されている弁体（図示せず）の開度比率を制御することで所望の温度の混合水を得る構成としてある。９は混合された混合水の温度を検知する温度検出器である入水サ―ミスタ、１０は出湯管で、給湯口であるカラン１１に接続されている。１２は出湯管１０から分岐された風呂パイプ１３に接続された風呂注湯開閉弁である。１４は浴槽で、電気温水器１と接続して、浴槽１４への湯張りと追い焚きを行うための浴槽循環口Ｗを備えている。１５は往き配管、１６は戻り配管、１７は往き管接続口、１８は戻り管接続口である。なお、電気温水器１内部では戻り管接続口１８から浴槽水の温度を検出するふろサーミスタ１９、風呂循環ポンプ２０を介して熱交換パイプ２１を内蔵した円筒状の温水熱交換器２２を通り、往き管接続口１７に戻るように接続し、風呂循環の経路を形成している。熱交換パイプ２１は１次側となるコイル状に巻いた部分のある１次側パイプ２３（ＩＮ側）と、コイル状に巻いた部分の内側を通り２次側となる２次側パイプ２４（ＯＵＴ側）を一体的に接続することより構成されている。温水熱交換器２２は、貯湯タンク２と接続された往き側パイプ２５と戻り側パイプ２６により接続されており、往き側パイプ２５は貯湯タンク２の上部と接続し、戻り側パイプ２６には貯湯タンク２の湯を温水熱交換器２２内に導き、熱交換パイプ２１と熱交換させた後に再び湯を貯湯タンク２へと戻す循環ポンプ２７が取り付けられている。２８は風呂注湯分岐管で、一方を風呂循環ポンプ２０と配管接続し、他方を熱交換パイプ２１の１次側パイプ２３と接続し、風呂循環の経路より浴槽１４への湯張りを行うようになっている。
【００２４】
次に以上のような構成にて動作を説明する。まず、カラン１１が開かれて給湯が行われると、入水サーミスタ９で検出される湯温と設定温度を比較し、設定温度になるように混合弁７により貯湯タンク２の湯と給水管５からの水道水を混合する。
【００２５】
次に浴槽１４に湯張りを行う場合は、風呂リモコンの自動湯張りスイッチ（図示せず）をオンにすると、風呂注湯開閉弁１２がオンして開弁し湯張りが開始される。その経路は、混合弁７で設定温度に混合された湯が、風呂パイプ１３を通り、弁開状態となった風呂注湯開閉弁１２から風呂循環の経路に供給され、往き配管１５および戻り配管１６から浴槽１４に供給され、湯張りが完了すると風呂注湯開閉弁１２はオフして閉弁状態となる。
【００２６】
次に浴槽水の追い焚き動作について説明する。浴槽水は一定時間ごとに風呂循環ポンプ２０を駆動して戻り配管１６から温水熱交換器２２を通って往き配管１５で浴槽１４に戻される。この間に、ふろサーミスタ１９で浴槽水の温度を検出し、設定温度より低ければ循環ポンプ２７が駆動し、貯湯タンク２の湯を温水熱交換器２２内に循環させ熱交換パイプ２１で浴槽水を加熱するようになっている。浴槽水が設定温度に回復すると風呂循環ポンプ２０と循環ポンプ２７は停止し、追い焚き動作が完了する。
【００２７】
尚、本実施例では、１次側パイプ２３をコイル状に巻き、２次側パイプ２４をコイル巻きの内側を通すようにしたが、２次側パイプ２４をコイル状に巻き、１次側パイプ２３をコイル巻きの内側を通すようにしても温水熱交換器２２の大きさは変わらない。また、追い焚き能力をさらに向上させるために、１次側パイプ２３と２次側パイプ２４共にコイル状に巻いた構成とすることもでき、いずれの構成とも温水熱交換器２２内に熱交換パイプ２１を無駄なく納めることができ、結果として温水熱交換器２２を小型化することができる。
【００２８】
また、貯湯タンク２内の湯温は上部側が高温となり、貯湯タンク２の上部より取り入れた湯を温水熱交換器２２内に循環させることにより、短時間で浴槽水の追い焚きができる。
【００２９】
また、電気温水器は設置床面積を小さくするために、製品の高さを高くすることにより貯湯容量の大型化に対応しており、その為、貯湯タンク２も縦長の円筒形状が主流となっており、本実施例のように温水熱交換器２２を貯湯タンク２の近傍かつ製品１のコーナー部に並立するように配置すれば、製品１外装と貯湯タンク２との隙間を利用して温水熱交換器２２を納めることができ、設置床面積を大きくすることなしに、使い勝手の良い電気温水器を供給することができる。
【００３０】
（実施例２）
図３（ａ）は本発明の実施例２における温水熱交換器内蔵型貯湯タンクユニットのシステム構成図、図３（ｂ）は実施例２の温水熱交換器の部分断面図である。
【００３１】
図３（ａ）、図３（ｂ）において、２２は温水熱交換器で、第１熱交換パイプ２９と、その主要部が第１熱交換パイプの上方に位置する第２熱交換パイプ３０を備えている。第１熱交換パイプ２９は１次側となるコイル状に巻いた部分のある１次側下パイプ３１（ＩＮ側）と、コイル状に巻いた部分の内側を通り２次側となる２次側下パイプ３２（ＯＵＴ側）を一体的に接続することより構成されている。第２熱交換パイプ３０は１次側となるコイル状に巻いた部分のある１次側上パイプ３３（ＩＮ側）と、コイル状に巻いた部分の内側を通り２次側となる２次側上パイプ３４（ＯＵＴ側）を一体的に接続し、第２熱交換パイプ３０の１次側上パイプ３３と２次側上パイプ３４は共に第１熱交換パイプ２９のコイル状に巻いた部分の内側を通るようになっている。３５は１次側連結パイプで、第１熱交換パイプ２９の１次側下パイプ３１と、第２熱交換パイプ３０の１次側上パイプ３３を一体化する。３６は２次側連結パイプで、第１熱交換パイプ２９の２次側下パイプ３２と、第２熱交換パイプ３０の２次側上パイプ３４を一体化する。すなわち、１次側連結パイプ３５と２次側連結パイプ３６により第１熱交換パイプ２９と第２熱交換パイプ３０を一本化した構成は実施例１の温水熱交換器２２と同様の機能を有するものとなる。温水熱交換器２２は、貯湯タンク２と往き側パイプ２５と戻り側パイプ２６により接続されており、戻り側パイプ２６には貯湯タンク２の湯を温水熱交換器２２内に導き、第１熱交換パイプ２９と第２熱交換パイプ３０で熱交換させた後に再び湯を貯湯タンク２へと戻す循環ポンプ２７が取り付けられている。
【００３２】
次に以上のような構成にて浴槽水の追い焚き動作について説明する。浴槽水は一定時間ごとに風呂循環ポンプ２０を駆動して戻り配管１６から温水熱交換器２２を通って往き配管１５で浴槽１４に戻される。この間に、ふろサーミスタ１９で浴槽水の温度を検出し、設定温度より低ければ循環ポンプ２７が駆動し、貯湯タンク２の湯を温水熱交換器２２内に循環させ第１熱交換パイプ２９と第２熱交換パイプ３０で浴槽水を加熱するようになっている。浴槽水が設定温度に回復すると風呂循環ポンプ２０と循環ポンプ２７は停止し、追い焚き動作が完了する。尚、本実施例では、１次側下パイプ３１と１次側上パイプ３３をコイル状に巻き、２次側下パイプ３２と２次側上パイプ３４をコイル巻きの内側を通すようにしたが、２次側下パイプ３２と２次側上パイプ３４をコイル状に巻き、１次側下パイプ３１と１次側上パイプ３３をコイル巻きの内側を通すようにしても温水熱交換器２２の大きさは変わらない。また、第１熱交換器２９と第２熱交換器３０をそれぞれ１次側連結パイプ３５と２次側連結パイプ３６により１本化せずに、第１熱交換器のみを浴槽水の追い焚き用に使用し、第２熱交換器を温水循環式の浴室乾燥機用などに使用することも可能である。そして、いずれの構成とも温水熱交換器２２内に第１熱交換パイプ２９と第２熱交換パイプ３０を無駄なく納めることができ、結果として温水熱交換器２２を小型化することができる。
【００３３】
以上の説明から明らかなように、本実施例に記載した温水熱交換器内蔵型貯湯タンクユニットによれば、温水熱交換器を小型化することができ、さらに、温水熱交換器が小型化できることにより熱交換パイプに沿って貯湯タンクの湯が循環することと、温水熱交換器表面からの放熱量を低減できることにより熱交換率を向上させることができ、経済的で日本の住宅事情に適マッチた機器を提供することができる。
【００３４】
また、本実施例の温水熱交換器内蔵型貯湯タンクユニットによれば、２つの熱交換パイプを備えたとしても、温水熱交換器の高さ方向のみを大きくすればよく、１次熱交換パイプと２次熱交換パイプの各々の１次側同士と、２次側同士を一体的に接続すれば、電気温水器の設置床面積を大きくすることなしに温水熱交換器の能力を向上できる。
【００３５】
また、コイル状に巻いた熱交換パイプの内側を通る熱交換パイプが温水熱交換器内を循環する流れの抵抗となり、攪拌効果により熱交換率が向上し、さらに熱交換器を小型化することができる。
【００３６】
また、さらに高温の湯が貯められている貯湯タンクの上部より取り入れた湯を、温度の下がった浴槽水の流れる１次側と対向するように循環させながら熱交換するので、より短時間で効率良く風呂の追い焚きが行えるとともに、熱交換率のさらなる向上によりさらに温水熱交換器を小型化することが可能となる。
【００３７】
また、１次側と熱交換した後の温度の下がった湯が流れる、温水熱交換器から貯湯タンクへの戻り側に循環ポンプを接続することにより、循環ポンプにかかる熱的ストレスが低減され、循環ポンプの劣化を防ぐことができる。
【００３８】
また、高温の湯が貯められている貯湯タンクの上部より取り入れた湯を、第１熱交換パイプの１次側および第２熱交換パイプの１次側と対向するように循環させながら熱交換するので、効率良く熱交換することができる。そして、１次熱交換パイプと２次熱交換パイプの各々の１次側同士と、２次側同士を一体的に接続すれば、電気温水器の設置床面積を大きくすることなしに温水熱交換器の能力を向上できるだけでなく、温水熱交換器のさらなる小型化と、温水熱交換器から貯湯タンクへ戻る湯温をより低下でき、熱的ストレスによる循環ポンプの劣化が防げる。
【００３９】
また、最も高温の湯が循環する第２熱交換パイプを負荷の大きな浴槽水の追い焚き用とし、第１熱交換パイプを負荷の小さな他の機器に使用とすることも可能である。
【００４０】
【発明の効果】
以上より、本発明によれば、電気温水器などに内蔵されている風呂の追い焚き用の温水熱交換器を小型化するにより、経済的で日本の住宅事情にマッチした機器を提供することが可能となる。
【図面の簡単な説明】
【図１】（ａ）本発明の実施例１における温水熱交換器内蔵型貯湯タンクユニットのシステム構成図
（ｂ）実施例１の温水熱交換器の部分構成図
（ｃ）実施例１の温水熱交換器の構成図
【図２】実施例１の製品の部分断面斜視図
【図３】（ａ）本発明の実施例２における温水熱交換器内蔵型貯湯タンクユニットのシステム構成図
（ｂ）は実施例２の温水熱交換器の部分構成図
【図４】（ａ）従来の温水熱交換器内蔵型貯湯タンクユニットのシステム構成図
（ｂ）従来の温水熱交換器内蔵型貯湯タンクユニットのシステム構成図
【符号の説明】
２　貯湯タンク
１４　浴槽
２０　風呂循環ポンプ
２１　熱交換パイプ
２２　温水熱交換器
２３　１次側パイプ（１次側）
２４　２次側パイプ（２次側）
２７　循環ポンプ[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention mainly relates to an electric water heater having a bath heating function.
[0002]
[Prior art]
This type of conventional hot water heat exchanger built-in type long bath tank unit has a configuration as shown in FIGS. 4 (a) and 4 (b).
[0003]
Hereinafter, the configuration will be described with reference to the drawings. In FIG. 4A, 31 is a product of an electric water heater, 32 is a cylindrical hot water storage tank, water is supplied from a water supply pipe 33, and hot water heated by a heater 34 is discharged from a hot water pipe 35. A bathtub 36 is provided with a bathtub circulation port 37 for connecting to the electric water heater 31 to fill the bathtub 36 and reheat the bathtub. Reference numeral 38 denotes an outgoing pipe, and 39 denotes a return pipe. Inside the electric water heater 31 connected to the return pipe 39, a bath thermistor 40 for detecting the temperature of bath water and a bath recirculation pump 41 for reheating the bath water. It is connected so as to pass through the heater type heat exchanger 42 and return to the outgoing pipe 38.
[0004]
FIG. 4 (b) shows a coil 1 that is connected to the hot water storage tank 32 instead of the electric heat exchanger 42, circulates the hot water in the hot water storage tank 32 by the reheating pump 43, and circulates the bathtub water inside. This is an electric water heater of a type that performs reheating by incorporating a hot water heat exchanger 47 having a heat exchange pipe 46 composed of a secondary pipe 44 (IN side) and a secondary pipe 45 (OUT side).
[0005]
[Problems to be solved by the invention]
In recent years, in the case of electric water heaters, demands for not only a heat retaining function of a bath but also a reheating function have been increasing. In addition, as the hot water storage capacity increases and the external dimensions of the product tend to increase, it is desired that the installation floor area be small in consideration of housing conditions in Japan.
[0006]
However, when the bathtub water is heated in a short time to improve the usability, an electric heater having a large wattage is required, and the running cost is increased.
[0007]
The expectation of users who use electric water heaters is to use the cheapest possible late-night power to make a merit in running cost. Heating has a problem that the contribution rate of hot water heated using midnight electric power becomes zero and does not always meet the expectations of the user.
[0008]
Therefore, those equipped with a hot water heat exchanger that heats hot water using midnight power and exchanges heat with bath water to reheat the water can be reheated in a short time by using hot water In addition, the type in which the heat exchanger is provided separately from the hot water storage tank is excellent for maintenance, but when trying to secure sufficient reheating capacity, the heat exchanger becomes large, and as a result, the product installation floor becomes large. There was a problem that the area became large.
[0009]
On the other hand, if only the secondary side pipe is taken out of the hot water heat exchanger, the volume of the hot water heat exchanger can be reduced, but the secondary pipe does not contribute to the heating of the bathtub water and the reheating capacity decreases. Resulting in. When the reheating capacity decreases, the temperature of the hot water returning from the hot water heat exchanger to the hot water storage tank increases, and the thermal stress of the reheating pump that circulates hot water from the hot water storage tank to the hot water heat exchanger increases, resulting in reheating. There is a problem that the pump for use tends to deteriorate.
[0010]
[Means for Solving the Problems]
In order to solve the above-described problems, the present invention has a hot water storage tank for storing hot water, a heat exchange pipe connected to the hot water storage tank and circulating hot water therein, and hot water for heating bath water with the heat exchange pipe. A heat exchanger, a circulation pump for circulating hot water in the hot water storage tank in the hot water heat exchanger, and a bath circulation pump for circulating bath water in the hot water heat exchanger; Alternatively, at least one of the secondary sides has a coiled portion, and either the primary side or the secondary side passes through the inside of the coiled portion.
[0011]
According to the above invention, the hot water heat exchanger can be downsized by allowing one of the primary side and the secondary side of the heat exchange pipe to pass through the inside of the coil winding, which is suitable for housing conditions in Japan. Equipment can be provided.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
A hot water storage tank unit with a built-in hot water heat exchanger according to claim 1 of the present invention includes a hot water storage tank for storing hot water, and a heat exchange pipe connected to the hot water storage tank and circulating hot water therein. A hot water heat exchanger for heating bath water with a pipe, a circulation pump for circulating hot water in a hot water storage tank in the hot water heat exchanger, and a bath circulation pump for circulating bath water in the hot water heat exchanger. At least one of the primary side and the secondary side of the heat exchange pipe has a coiled portion, and one of the primary side and the secondary side is formed inside the coiled portion. It is configured to pass.
[0013]
Then, either the primary side or the secondary side of the heat exchange pipe passes through the inside of the coiled portion, so that the hot water heat exchanger can be downsized. The small size allows the hot water in the hot water storage tank to circulate along the vicinity of the heat exchange pipe, and reduces the amount of heat released from the hot water heat exchanger surface, thereby improving the heat exchange rate. Can be provided.
[0014]
A hot water storage tank unit with a built-in hot water heat exchanger according to a second aspect of the present invention includes a hot water storage tank for storing hot water, a first heat exchange pipe connected to the hot water storage tank and circulating hot water therein, and a second heat exchange pipe. A hot water heat exchanger for heating the bath water in one or both of the first heat exchange pipe and the second heat exchange pipe, and hot water in a hot water storage tank in the hot water heat exchanger. A circulating pump for circulating, and a bath circulating pump for circulating bath water in the hot water heat exchanger, wherein at least one of the primary side and the secondary side of the first heat exchange pipe is coiled. And one of the primary side and the secondary side passes through the inside of the coiled portion, and at least one of the primary side and the secondary side of the second heat exchanger is a coil. Has a part wound in a shape, Either the primary side or the secondary side passes through the inside of the coiled portion, and both the primary side and the secondary side correspond to the coiled portion of the first heat exchanger. It is configured to pass through the inside.
[0015]
And either the primary side or the secondary side of the first heat exchange pipe and the primary side and the secondary side of the second heat exchange pipe are both inside the coiled portion of the first heat exchange pipe. Therefore, even if two heat exchange pipes are provided, only the height direction of the hot water heat exchanger need be increased, and the primary side of each of the primary heat exchange pipe and the secondary heat exchange pipe If the two and the secondary sides are integrally connected, the capacity of the hot water heat exchanger can be improved without increasing the installation floor area of the electric water heater.
[0016]
In addition, the heat exchange pipe passing through the inside of the coil-shaped heat exchange pipe becomes a resistance to the flow circulating in the hot water heat exchanger, the heat exchange rate is improved by the stirring effect, and the heat exchanger is further downsized. Can be.
[0017]
A hot water storage tank unit with a built-in hot water heat exchanger according to a third aspect of the present invention includes a hot water storage tank for storing hot water, and a heat exchange pipe connected to the hot water storage tank and circulating hot water therein. A hot water heat exchanger for heating bath water with a pipe, a circulation pump for circulating hot water in a hot water storage tank in the hot water heat exchanger, and a bath circulation pump for circulating bath water in the hot water heat exchanger. The primary side of the heat exchange pipe has a coiled portion, the secondary side passes inside the primary-side coiled portion, and the hot water heat exchanger is a hot water storage tank. Hot water is taken in from the upper part, and the hot water is circulated so as to face the primary side, and the circulation pump is connected to the return side from the hot water heat exchanger to the hot water storage tank. The upper part of the hot water storage tank Heat exchange is performed while circulating the introduced hot water so as to be opposed to the primary side where the cooled bath water flows, so that the reheating of the bath can be performed more efficiently in a shorter time and the heat exchange rate is further improved. Further, the size of the hot water heat exchanger can be reduced.
[0018]
Also, by connecting the circulation pump to the return side from the hot water heat exchanger to the hot water storage tank where the temperature of the hot water whose temperature has been exchanged with the primary side flows, the thermal stress on the circulation pump is reduced, The deterioration of the circulation pump can be prevented.
[0019]
A hot water storage tank unit with a built-in hot water heat exchanger according to a fourth aspect of the present invention includes a hot water storage tank for storing hot water, a first heat exchange pipe connected to the hot water storage tank and circulating hot water therein, and a second heat exchange pipe. A hot water heat exchanger for heating the bath water in one or both of the first heat exchange pipe and the second heat exchange pipe, and hot water in a hot water storage tank in the hot water heat exchanger. A circulating pump for circulating water; a bath circulating pump for circulating bath water to the hot water heat exchanger; a primary side of the first heat exchange pipe has a coiled portion; The second heat exchange pipe has a coiled portion on the primary side, and the secondary side has a coiled portion on the primary side so as to pass through the inside of the coiled portion on the secondary side. And the primary side and the secondary side are both the first heat exchange. The hot water heat exchanger takes in hot water from the upper part of the hot water storage tank and passes the hot water into the primary side of the first heat exchange pipe and to the inside of the coiled portion on the primary side of the pipe. Circulates so as to face the primary side of the second heat exchange pipe, and the circulation pump is connected to the return side from the hot water heat exchanger to the hot water storage tank. Hot water taken in from the upper part of the tank is heat-exchanged while being circulated so as to face the primary side of the first heat exchange pipe and the primary side of the second heat exchange pipe, so that heat can be exchanged efficiently. If the primary side and the secondary side of the primary heat exchange pipe and the secondary heat exchange pipe are integrally connected, the hot water heat exchange can be performed without increasing the installation floor area of the electric water heater. Not only can the capacity of the water heater be improved, but also the size of the hot water heat exchanger can be further reduced, and the temperature of the hot water returning from the hot water heat exchanger to the hot water storage tank can be further reduced.
[0020]
It is also possible to use the second heat exchange pipe, through which the hottest water circulates, for reheating bathtub water with a large load, and use the first heat exchange pipe for other equipment with a small load.
[0021]
【Example】
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0022]
(Example 1)
FIG. 1A is a system configuration diagram of a hot water heat exchanger built-in hot water storage tank unit according to a first embodiment of the present invention, FIG. 1B is a partial cross-sectional view of the hot water heat exchanger of the first embodiment, and FIG. 2) is a sectional view of the hot water heat exchanger of the first embodiment, and FIG. 2 is a partial sectional perspective view of the product of the first embodiment.
[0023]
In FIGS. 1 (a), 1 (b), 1 (c) and 2, reference numeral 1 denotes a product of an electric water heater, 2 denotes a cylindrical hot water storage tank, 3 denotes a water pipe, and 4 denotes a water pressure reduction. A pressure reducing valve 5, a water supply pipe 5, a heater 6 attached to face the inside of the hot water storage tank 2, a motor-driven mixing valve 7 connected to a hot water supply pipe 8 connected to the hot water storage tank 2 and a water supply pipe 5. It is configured to obtain a mixed water of a desired temperature by controlling an opening ratio of a valve body (not shown) which is connected and built in according to a set temperature. Reference numeral 9 denotes an inlet water thermistor which is a temperature detector for detecting the temperature of the mixed water mixed, and reference numeral 10 denotes a tapping pipe which is connected to a curan 11 serving as a hot water supply port. Reference numeral 12 denotes a bath pouring opening / closing valve connected to a bath pipe 13 branched from the tapping pipe 10. A bathtub 14 is connected to the electric water heater 1 and has a bathtub circulation port W for filling the bathtub 14 and reheating the bathtub. 15 is an outgoing pipe, 16 is a return pipe, 17 is an outgoing pipe connection port, and 18 is a return pipe connecting port. In the electric water heater 1, a bath thermistor 19 for detecting the temperature of bathtub water from the return pipe connection port 18, and a bath circulation pump 20 pass through a cylindrical hot water heat exchanger 22 with a built-in heat exchange pipe 21. It is connected back to the outgoing pipe connection port 17 to form a bath circulation path. The heat exchange pipe 21 has a primary-side pipe 23 (IN side) having a coiled portion serving as a primary side, and a secondary-side pipe 24 (a secondary side passing through the inside of the coiled portion). OUT side) are integrally connected. The hot water heat exchanger 22 is connected to an outgoing pipe 25 connected to the hot water storage tank 2 and a return pipe 26, and the outgoing pipe 25 is connected to an upper portion of the hot water storage tank 2, and the return pipe 26 stores hot water. A circulation pump 27 that guides the hot water in the tank 2 into the hot water heat exchanger 22 and exchanges heat with the heat exchange pipe 21 and then returns the hot water to the hot water storage tank 2 again is attached. 28 is a bath pouring branch pipe, one of which is connected to the bath circulation pump 20 by piping and the other is connected to the primary pipe 23 of the heat exchange pipe 21 so as to fill the bathtub 14 from the bath circulation path. It has become.
[0024]
Next, the operation of the above configuration will be described. First, when the hot water supply is performed by opening the curran 11, the hot water temperature detected by the water input thermistor 9 is compared with the set temperature, and the hot water of the hot water storage tank 2 and the water supply pipe 5 are mixed by the mixing valve 7 so as to reach the set temperature. Mix the tap water.
[0025]
Next, when filling the bathtub 14 with water, when an automatic filling switch (not shown) of the bath remote controller is turned on, the bath pouring on / off valve 12 is turned on and the valve is opened to start filling. In the path, hot water mixed to the set temperature by the mixing valve 7 passes through the bath pipe 13, is supplied to the bath circulation path from the bath pouring on-off valve 12, which is in the valve opened state, and goes to the going pipe 15 and the return pipe. The water is supplied to the bath 14 from the bath 16, and when the filling is completed, the bath pouring on / off valve 12 is turned off to close the valve.
[0026]
Next, the reheating operation of the bathtub water will be described. The bathtub water drives the bath circulation pump 20 at regular intervals, passes through the return pipe 16 through the hot water heat exchanger 22, and is returned to the bathtub 14 by the pipe 15. During this time, the bath thermistor 19 detects the temperature of the bath water. If the temperature is lower than the set temperature, the circulation pump 27 is driven to circulate the hot water in the hot water storage tank 2 into the hot water heat exchanger 22 so that the bath water is removed by the heat exchange pipe 21. It is designed to be heated. When the bath water returns to the set temperature, the bath circulation pump 20 and the circulation pump 27 stop, and the reheating operation is completed.
[0027]
In this embodiment, the primary pipe 23 is wound in a coil shape, and the secondary pipe 24 is passed through the inside of the coil. However, the secondary pipe 24 is wound in a coil shape, and the primary pipe 23 is wound. The size of the hot water heat exchanger 22 does not change even if the 23 is passed through the inside of the coil winding. Further, in order to further improve the reheating capability, both the primary pipe 23 and the secondary pipe 24 may be wound in a coil shape. 21 can be stored without waste, and as a result, the size of the hot water heat exchanger 22 can be reduced.
[0028]
In addition, the temperature of the hot water in the hot water storage tank 2 becomes high on the upper side, and the hot water taken in from the upper part of the hot water storage tank 2 is circulated in the hot water heat exchanger 22, so that the bathtub water can be reheated in a short time.
[0029]
In addition, the electric water heater responds to the increase in the hot water storage capacity by increasing the height of the product in order to reduce the installation floor area. Therefore, the vertically long cylindrical shape of the hot water storage tank 2 is mainly used. If the hot water heat exchanger 22 is arranged in the vicinity of the hot water storage tank 2 and side by side at the corner of the product 1 as in the present embodiment, the hot water The heat exchanger 22 can be accommodated, and an easy-to-use electric water heater can be supplied without increasing the installation floor area.
[0030]
(Example 2)
FIG. 3A is a system configuration diagram of a hot water storage tank unit with a built-in hot water heat exchanger according to a second embodiment of the present invention, and FIG. 3B is a partial cross-sectional view of the hot water heat exchanger of the second embodiment.
[0031]
3 (a) and 3 (b), reference numeral 22 denotes a hot water heat exchanger, which includes a first heat exchange pipe 29 and a second heat exchange pipe 30 whose main part is located above the first heat exchange pipe. Have. The first heat exchange pipe 29 includes a primary lower pipe 31 (IN side) having a coiled portion serving as a primary side, and a secondary side serving as a secondary side passing through the inside of the coiled portion. The lower pipe 32 (OUT side) is integrally connected. The second heat exchange pipe 30 includes a primary upper pipe 33 (IN side) having a coiled portion serving as a primary side, and a secondary side serving as a secondary side passing through the inside of the coiled portion. The upper pipe 34 (OUT side) is integrally connected, and the primary upper pipe 33 and the secondary upper pipe 34 of the second heat exchange pipe 30 are both of the coiled part of the first heat exchange pipe 29. It passes through the inside. Reference numeral 35 denotes a primary connection pipe that integrates the primary lower pipe 31 of the first heat exchange pipe 29 and the primary upper pipe 33 of the second heat exchange pipe 30. Reference numeral 36 denotes a secondary connection pipe, which integrates the secondary lower pipe 32 of the first heat exchange pipe 29 and the secondary upper pipe 34 of the second heat exchange pipe 30. That is, the configuration in which the first heat exchange pipe 29 and the second heat exchange pipe 30 are unified by the primary side connection pipe 35 and the secondary side connection pipe 36 has the same function as the hot water heat exchanger 22 of the first embodiment. Will have. The hot water heat exchanger 22 is connected to the hot water storage tank 2 by an outgoing pipe 25 and a return pipe 26, and the hot water in the hot water storage tank 2 is guided into the hot water heat exchanger 22 by the return pipe 26 and the first heat A circulation pump 27 for returning the hot water to the hot water storage tank 2 after the heat exchange between the exchange pipe 29 and the second heat exchange pipe 30 is attached.
[0032]
Next, the reheating operation of the bathtub water with the above configuration will be described. The bathtub water drives the bath circulation pump 20 at regular intervals, passes through the return pipe 16 through the hot water heat exchanger 22, and is returned to the bathtub 14 by the pipe 15. During this time, the bath thermistor 19 detects the temperature of the bathtub water. If the temperature is lower than the set temperature, the circulation pump 27 is driven to circulate the hot water in the hot water storage tank 2 into the hot water heat exchanger 22 and the first heat exchange pipe 29 and the second (2) The bathtub water is heated by the heat exchange pipe 30. When the bath water returns to the set temperature, the bath circulation pump 20 and the circulation pump 27 stop, and the reheating operation is completed. In this embodiment, the primary lower pipe 31 and the primary upper pipe 33 are wound in a coil shape, and the secondary lower pipe 32 and the secondary upper pipe 34 are passed through the inside of the coil winding. Even if the secondary lower pipe 32 and the secondary upper pipe 34 are wound in a coil shape and the primary lower pipe 31 and the primary upper pipe 33 are passed through the inside of the coil winding, the hot water heat exchanger 22 The size does not change. Further, the first heat exchanger 29 and the second heat exchanger 30 are not united by the primary side connecting pipe 35 and the secondary side connecting pipe 36, respectively, and only the first heat exchanger is reheated by bathtub water. It is also possible to use the second heat exchanger for a hot water circulation type bathroom dryer or the like. In any configuration, the first heat exchange pipe 29 and the second heat exchange pipe 30 can be stored in the hot water heat exchanger 22 without waste, and as a result, the hot water heat exchanger 22 can be downsized.
[0033]
As is clear from the above description, according to the hot water heat exchanger built-in hot water storage tank unit described in the present embodiment, the hot water heat exchanger can be downsized, and further, the hot water heat exchanger can be downsized. By circulating the hot water in the hot water storage tank along the heat exchange pipe and reducing the amount of heat released from the surface of the hot water heat exchanger, the heat exchange rate can be improved, making it economical and suitable for Japanese housing conditions. Equipment can be provided.
[0034]
Further, according to the hot water heat exchanger built-in hot water storage tank unit of the present embodiment, even if two heat exchange pipes are provided, only the height direction of the hot water heat exchanger needs to be enlarged, and the primary heat exchange pipe If the primary side and the secondary side of each and the secondary heat exchange pipes are integrally connected, the capacity of the hot water heat exchanger can be improved without increasing the installation floor area of the electric water heater.
[0035]
In addition, the heat exchange pipe passing through the inside of the coil-shaped heat exchange pipe becomes a resistance to the flow circulating in the hot water heat exchanger, the heat exchange rate is improved by the stirring effect, and the heat exchanger is further downsized. Can be.
[0036]
In addition, since heat is exchanged while circulating hot water taken in from the upper part of the hot water storage tank storing hot water, so as to be opposed to the primary side through which the cooled bath water flows, the efficiency is reduced in a shorter time. The reheating of the bath can be performed well and the hot water heat exchanger can be further downsized by further improving the heat exchange rate.
[0037]
Also, by connecting the circulation pump to the return side from the hot water heat exchanger to the hot water storage tank, where the temperature of the hot water after the heat exchange with the primary side flows, the thermal stress on the circulation pump is reduced, The deterioration of the circulation pump can be prevented.
[0038]
Also, heat exchange is performed while circulating hot water taken in from the upper portion of the hot water storage tank storing hot water so as to face the primary side of the first heat exchange pipe and the primary side of the second heat exchange pipe. Therefore, heat exchange can be performed efficiently. If the primary side and the secondary side of the primary heat exchange pipe and the secondary heat exchange pipe are integrally connected, the hot water heat exchange can be performed without increasing the installation floor area of the electric water heater. Not only can the capacity of the water heater be improved, but also the size of the hot water heat exchanger can be further reduced, and the temperature of hot water returning from the hot water heat exchanger to the hot water storage tank can be further reduced, thereby preventing deterioration of the circulation pump due to thermal stress.
[0039]
It is also possible to use the second heat exchange pipe, through which the hottest water circulates, for reheating bathtub water with a large load, and use the first heat exchange pipe for other equipment with a small load.
[0040]
【The invention's effect】
As described above, according to the present invention, it is possible to provide equipment that is economical and matches Japanese housing conditions by reducing the size of a hot water heat exchanger for reheating a bath built in an electric water heater or the like. It becomes possible.
[Brief description of the drawings]
FIG. 1A is a system configuration diagram of a hot water heat exchanger built-in type hot water storage tank unit according to a first embodiment of the present invention; FIG. 1B is a partial configuration diagram of the hot water heat exchanger according to the first embodiment; FIG. 2 is a partial cross-sectional perspective view of the product of the first embodiment. FIG. 3 (a) is a system configuration diagram of a hot water heat exchanger built-in hot water storage tank unit in a second embodiment of the present invention. FIG. 4A is a partial configuration diagram of a hot water heat exchanger according to a second embodiment. FIG. 4A is a system configuration diagram of a conventional hot water heat exchanger built-in hot water storage tank unit. System configuration diagram [Description of symbols]
2 Hot water storage tank 14 Bath tub 20 Bath circulation pump 21 Heat exchange pipe 22 Hot water heat exchanger 23 Primary pipe (primary side)
24 Secondary pipe (secondary side)
27 Circulation pump

Claims

湯を貯める貯湯タンクと、この貯湯タンクと接続し、内部に温水を循環させる熱交換パイプを有し、この熱交換パイプで浴槽水の加熱を行う温水熱交換器と、この温水熱交換器内に貯湯タンク内の湯を循環させる循環ポンプと、前記温水熱交換器に浴槽水を循環させる風呂循環ポンプとを備え、前記熱交換パイプの１次側あるいは２次側の少なくともどちらか一方はコイル状に巻いた部分を有し、１次側あるいは２次側のどちらか一方はコイル状に巻いた部分の内側を通る構成とした温水熱交換器内蔵型貯湯タンクユニット。A hot water storage tank for storing hot water, a heat exchange pipe connected to the hot water storage tank and circulating hot water therein, and a hot water heat exchanger for heating bath water with the heat exchange pipe; A circulating pump for circulating hot water in the hot water storage tank, and a bath circulating pump for circulating bath water in the hot water heat exchanger, wherein at least one of the primary side and the secondary side of the heat exchange pipe is a coil. A hot water heat exchanger built-in hot water storage tank unit having a portion wound in a shape, and one of the primary side and the secondary side is configured to pass through the inside of the coiled portion.

湯を貯める貯湯タンクと、この貯湯タンクと接続し、内部に温水を循環させる第１熱交換パイプと第２熱交換パイプを有し、この第１熱交換パイプと第２熱交換パイプの両方、あるいはどちらか一方で浴槽水の加熱を行う温水熱交換器と、この温水熱交換器内に貯湯タンク内の湯を循環させる循環ポンプと、前記温水熱交換器に浴槽水を循環させる風呂循環ポンプとを備え、前記第１熱交換パイプの１次側あるいは２次側の少なくともどちらか一方はコイル状に巻いた部分を有し、なおかつ１次側あるいは２次側のどちらか一方はコイル状に巻いた部分の内側を通るようにし、第２熱交換器の１次側と２次側の少なくともどちらか一方はコイル状に巻いた部分を有し、なおかつ１次側あるいは２次側のどちらか一方はコイル状に巻いた部分の内側を通るようにし、なおかつ１次側と２次側は共に第１熱交換器のコイル状に巻いた部分の内側を通る構成とした温水熱交換器内蔵型貯湯タンクユニット。A hot water storage tank for storing hot water, a first heat exchange pipe and a second heat exchange pipe connected to the hot water storage tank and circulating hot water therein, and both the first heat exchange pipe and the second heat exchange pipe; Alternatively, a hot water heat exchanger for heating bath water in one or the other, a circulation pump for circulating hot water in a hot water storage tank in the hot water heat exchanger, and a bath circulation pump for circulating bath water in the hot water heat exchanger Wherein at least one of the primary side and the secondary side of the first heat exchange pipe has a coiled portion, and one of the primary side and the secondary side is coiled. At least one of the primary side and the secondary side of the second heat exchanger has a coiled part and passes through the inside of the wound part, and either the primary side or the secondary side One of the parts wound in a coil To pass through the side, yet the primary side and the secondary side is the hot water heat exchanger built-in type hot water storage tank unit where the structure together through the inside of the coiled winding portion of the first heat exchanger.

湯を貯める貯湯タンクと、この貯湯タンクと接続し、内部に温水を循環させる熱交換パイプを有し、この熱交換パイプで浴槽水の加熱を行う温水熱交換器と、この温水熱交換器内に貯湯タンク内の湯を循環させる循環ポンプと、前記温水熱交換器に浴槽水を循環させる風呂循環ポンプとを備え、前記熱交換パイプの１次側はコイル状に巻いた部分を有し、２次側は１次側のコイル状に巻いた部分の内側を通るようにし、前記温水熱交換器は貯湯タンクの上部より湯を取り入れ、この取り入れた湯を１次側と対向するように循環し、前記循環ポンプは温水熱交換器から貯湯タンクへの戻り側に接続する構成とした温水熱交換器内蔵型貯湯タンクユニット。A hot water storage tank for storing hot water, a heat exchange pipe connected to the hot water storage tank and circulating hot water therein, and a hot water heat exchanger for heating bath water with the heat exchange pipe; A circulation pump for circulating hot water in the hot water storage tank, and a bath circulation pump for circulating bath water in the hot water heat exchanger, and the primary side of the heat exchange pipe has a coiled portion, The secondary side passes inside the coiled part of the primary side, and the hot water heat exchanger takes in hot water from the upper part of the hot water storage tank and circulates the taken-in hot water so as to face the primary side. The circulation pump is connected to the return side of the hot water heat exchanger to the hot water storage tank.

湯を貯める貯湯タンクと、この貯湯タンクと接続し、内部に温水を循環させる第１熱交換パイプと第２熱交換パイプを有し、この第１熱交換パイプと第２熱交換パイプの両方、あるいはどちらか一方で浴槽水の加熱を行う温水熱交換器と、この温水熱交換器内に貯湯タンク内の湯を循環させる循環ポンプと、前記温水熱交換器に浴槽水を循環させる風呂循環ポンプとを備え、前記第１熱交換パイプの１次側はコイル状に巻いた部分を有し、２次側は１次側のコイル状に巻いた部分の内側を通るようにし、第２熱交換パイプの１次側はコイル状に巻いた部分を有し、２次側は１次側のコイル状に巻いた部分の内側を通るようにし、なおかつ１次側と２次側は共に第１熱交換パイプの１次側のコイル状に巻いた部分の内側を通るようにし、前記温水熱交換器は貯湯タンクの上部より湯を取り入れ、この取り入れた湯を前記第１熱交換パイプの１次側および、第２熱交換パイプの１次側と対向するように循環し、前記循環ポンプは温水熱交換器から貯湯タンクへの戻り側に接続する構成とした温水熱交換器内蔵型貯湯タンクユニット。A hot water storage tank for storing hot water, a first heat exchange pipe and a second heat exchange pipe connected to the hot water storage tank and circulating hot water therein, and both the first heat exchange pipe and the second heat exchange pipe; Alternatively, a hot water heat exchanger for heating bath water in one or the other, a circulation pump for circulating hot water in a hot water storage tank in the hot water heat exchanger, and a bath circulation pump for circulating bath water in the hot water heat exchanger Wherein the primary side of the first heat exchange pipe has a coiled portion, and the secondary side passes inside the coiled portion of the primary side, and the second heat exchange pipe The primary side of the pipe has a coiled portion, the secondary side passes inside the coiled portion of the primary side, and both the primary side and the secondary side have the first heat. Pass through the inside of the coiled part on the primary side of the exchange pipe, The heat exchanger takes in hot water from the upper part of the hot water storage tank, circulates the hot water so as to face the primary side of the first heat exchange pipe and the primary side of the second heat exchange pipe, Is a hot water heat exchanger built-in hot water storage tank unit that is connected to the return side of the hot water heat exchanger to the hot water storage tank.