JP2004108719A

JP2004108719A - Hot water storage type hot water supply apparatus

Info

Publication number: JP2004108719A
Application number: JP2002274522A
Authority: JP
Inventors: Koryu Watanabe; 渡邊　興隆; Koichi Horikoshi; 堀越　康一; Shinichiro Hayashi; 林　慎一郎
Original assignee: Mitsubishi Electric Corp
Current assignee: Mitsubishi Electric Corp
Priority date: 2002-09-20
Filing date: 2002-09-20
Publication date: 2004-04-08
Anticipated expiration: 2022-09-20
Also published as: JP3912242B2

Abstract

<P>PROBLEM TO BE SOLVED: To provide a hot water storage type hot water supply apparatus preventing a temporary flow of heated hot water into a bathtub at the beginning of reheating operation, and capable of normally executing the first reheating operation after installation. <P>SOLUTION: A stored hot water circulation circuit 6 is provided with a circulation flow regulating valve 9 regulating a circulation flow rate. Until a start of the first boiling operation of stored hot water by a heating body 4 starts after supplying power to a hot water supply apparatus body 1, a control part 50 controls the valve 9 that the valve 9 is fully opened. When the reheating operation or operation of a circulation pump 12 is not executed after completion of the first boiling operation of the stored hot water by the heating body 4, the control part 50 controls the valve 9 such that the valve 9 is fully closed. <P>COPYRIGHT: (C)2004,JPO

Description

【０００１】
【発明の属する技術分野】
本発明は、貯湯タンク外部で、貯湯水と浴槽水との間で熱交換する追焚き機能を備えた貯湯式給湯器に関するものである。
【０００２】
【従来の技術】
従来の浴槽追焚き機能を備えた貯湯式給湯器においては、浴槽の追焚き時に、循環ポンプを運転して貯湯タンクの上部より循環回路に高温水を取り出し、風呂用熱交換器で浴槽水と熱交換させ、浴槽水の温度を検出しながら浴槽水の追焚きを行っている。（例えば、特許文献１参照）。
【０００３】
【特許文献１】
特開２００１−１０８２９２号公報
【０００４】
【発明が解決しようとする課題】
しかしながら、上記のような従来の構成では、貯湯タンク内の湯の分布によるが、貯湯タンク内の水が全量湯になっている場合、循環回路内の水と貯湯タンク内の湯の比重差により貯湯水循環回路も湯が対流し、風呂用熱交換器が熱くなってしまい、追焚き運転開始時に、浴槽に熱い湯が一時的に出てしまうという問題がある。一方、追焚き運転開始までに循環回路を閉じてしまうと、据え付け後、循環ポンプに呼び水をしないと循環ポンプが空運転して正常に追焚き運転ができないという問題がある。
【０００５】
本発明は、上記のような問題点を解消するためになされたもので、追焚き運転開始時に浴槽に熱い湯が一時的に出ることを防ぎ、一方、据え付け後の第１回目の追焚き運転が正常にできる貯湯式給湯器を提供することを目的とする。
【０００６】
【課題を解決するための手段】
本発明に係る貯湯式給湯器は、下部から給水され、上部から出湯される貯湯タンクと、この貯湯タンク内の貯湯水を加熱する加熱手段と、前記貯湯タンク内の貯湯水の温度を検出する温度検出手段と、前記貯湯タンクの上部から取り出した貯湯水を前記貯湯タンクへ戻す貯湯水循環回路と、この貯湯水循環回路に設けた循環ポンプと、貯湯タンクから取り出した貯湯水と浴槽水との間で熱交換する熱交換器と、前記浴槽水を循環する浴槽水循環回路と、この浴槽水循環回路に設けた循環ポンプと、給湯器の運転を制御する制御部とを備えた貯湯式給湯器において、前記貯湯水循環回路に循環流量を調整する循環流量調整手段を設け、前記制御部は、給湯器本体に電源投入後、前記加熱手段による貯湯水の第１回目の沸き上げ動作が開始するまでは、前記循環流量調整手段を全開になるよう制御するものである。
【０００７】
【発明の実施の形態】
実施の形態１．
図１は本発明の実施の形態１を示す貯湯式給湯器の構成図であり、図２は沸き上げ制御時のフローチャートであり、図３は追焚き制御時のフローチャートである。。
図１において、給湯器本体１内に貯湯タンク２が配設され、貯湯水を加熱する発熱体４が貯湯タンク２に取付けてある。この貯湯タンク２の下部には給水管３が接続されている。この給水管３に減圧弁３ａが設けられ、前記貯湯タンク２の上部に給湯管５が接続されている。この給湯管５に逃し弁５ａが設けられ、貯湯タンク２の上下部で貯湯水循環回路６が接続されている。この貯湯水循環回路６は貯湯タンク２内に貯湯されたお湯と浴槽１０内のお湯を熱交換する熱交換器７、貯湯タンク２内のお湯を貯湯水循環回路６に循環させる循環ポンプ８、貯湯水循環回路６を通るお湯の循環流量を調整する循環流量調整弁９で構成されている。浴槽１０に浴槽水循環回路１１が接続され、この浴槽水循環回路１１には浴槽水往き循環回路１１ａと浴槽水を循環させる循環ポンプ１２と前記熱交換器７と浴槽水戻り循環回路１１ｂで構成されている。
【０００８】
貯湯タンク２の外側面には内部の湯の温度を検出する温度センサ１４ａ，１４ｂが所定間隔を有して取り付けられている。貯湯水循環回路６には熱交換器７への貯湯水の入口温度を検出する温度センサ１５ａと熱交換器７からの貯湯水の出口温度を検出する温度センサ１５ｂが取り付けられている。また、浴槽水循環回路１１には熱交換器７への浴槽水の入口温度を検出する温度センサ１５ｃと熱交換器７からの浴槽水の出口温度を検出する温度センサ１５ｄが取り付けられている。制御部５０は前記各温度センサ１４ａ，１４ｂ，１５ａ，１５ｂ，１５ｃ，１５ｄの検出値を読込み、操作部６０の設定に基づいて発熱体４，循環ポンプ８，１２、循環流量調整弁９を制御し，給湯器の運転を制御する。
【０００９】
ここで、循環流量調整弁９の調節次第で、貯湯水循環回路６の循環量は増減し、浴槽１０を加熱する加熱能力が変化する。循環流量調整弁９が全開時は加熱能力が最大で、貯湯水循環回路６の循環量を少なくした場合、加熱能力は低下するが、浴槽１０に戻る湯温も低くできる。
【００１０】
次に、本実施の形態１における貯湯式給湯器の沸き上げ制御の動作について、図２のフローチャートを用いて説明する。
給湯器本体１に電源が投入されるまでは、循環流量調整弁９は全開になっており、給水管３から給水された水は所定圧に減圧弁３で減圧され貯湯タンク２に給水され、貯湯タンク２と貯湯水循環回路６に水が満たされる。
【００１１】
給湯器本体１に電源が投入され、沸き上げ制御が開始されると（Ｓ２１）、制御部５０により循環流量調整弁９は全閉にされ（Ｓ２２）、貯湯タンク２に取付けてある発熱体４に通電される（Ｓ２３）。そして、沸き上げ温度を貯湯タンク２に取付けてある温度センサ１４ａ，１４ｂで検出し、貯湯水が操作部６０で設定された温度（例えば９０℃）まで沸き上げると（Ｓ２４）、発熱体４への通電を停止して（Ｓ２５）、沸き上げ制御を終了する（Ｓ２６）。
【００１２】
この時、沸き上げ開始直後に、制御部５０は循環流量調整弁９を全閉に制御しているが、貯湯タンク２と貯湯水循環回路６には水が満たされているので、第１回目の追焚き運転は正常にできる。
以降、循環流量調整弁９が全閉されているので、貯湯水循環回路６は遮断され、貯湯タンク２の湯が貯湯水循環回路６に対流しないので、熱交換器７が熱くならずに、風呂の追焚き運転開始時に、浴槽１０に熱い湯が出ることはない。
なお、沸き上げ時の貯湯タンク２の膨張水は逃し弁５ａより排出される。
また、一般の蛇口などに給湯する場合は、蛇口を開くことによって、給湯管５を通して水源水圧の力で給湯され、貯湯タンク２下部に水が供給される。
【００１３】
次に、実施の形態１における浴槽水の追焚き制御の動作について、図３のフローチャートにより説明する。
ここで、以下の説明の為、熱交換器７の貯湯水入口温度センサ１５ａの検出温度である入力値をＴｈｉ、貯湯水出口温度センサ１５ｂの検出温度である入力値をＴｈｏ、浴槽水入口温度センサ１５ｃの検出温度である入力値をＴｃｉ、浴槽水出口温度センサ１５ｄの検出温度である入力値をＴｃｏと定義する。
【００１４】
図３において、操作部６０の操作により追焚き制御が開始されると（Ｓ１）、まず、循環ポンプ１２が運転されて浴槽１０内のお湯が浴槽水循環回路１１に導かれ、熱交換器７を通って浴槽１０内に戻される（Ｓ２）。循環ポンプ１２を動作させて所定時間（例えば６０秒）経過後（Ｓ３）、浴槽水入口側の温度センサ１５ｃの検出温度である入力値Ｔｃｉと浴槽水出口側の温度センサ１５ｄの検出温度である入力値Ｔｃｏとの差を比較する（Ｓ４）。熱交換器７は給湯器本体１内温度（例えば４０℃）になっているので、ＴｃｉとＴｃｏは浴槽水温度になり、浴槽水入口側の温度センサ１５ｃと浴槽水出口側の温度センサ１５ｄが正常品であれば、ＴｃｉとＴｃｏで温度差はほとんどない。
【００１５】
したがって、ＴｃｉとＴｃｏの温度差が所定温度（例えば１０℃）以内かどうかを比較し（Ｓ４）、ＴｃｉとＴｃｏの温度差が所定温度（例えば１０℃）以内であれば、温度センサ１５ｃ，１５ｄはともに正常であると判定し（Ｓ５）、追焚き加熱動作を継続する。ＴｃｉとＴｃｏの温度差が所定温度（例えば１０℃）以上であれば、浴槽水入口側の温度センサ１５ｃか、又は浴槽水出口側の温度センサ１５ｄのいずれかに異常（不具合を起こしている）ありと判定し（Ｓ１０）、以降の追焚き加熱動作を禁止する。（Ｓ１１）
【００１６】
ステップＳ５で、浴槽水入口側の温度センサ１５ｃと浴槽水出口側の温度センサ１５ｄが正常と判定したときは、循環流量調整弁９は全閉から全開に切り換えられ、循環ポンプ８も運転を開始して、貯湯タンク２の上部より高温の貯湯水が貯湯水循環回路６に導かれ、熱交換器７を通って貯湯タンク２の下部に戻され、追焚き加熱動作を開始する（Ｓ６）。この時、熱交換器７は、貯湯タンク２内に貯湯された高温の貯湯水から低温の浴槽水に熱交換（伝熱）することで、浴槽水を入浴に適した温度に加熱昇温させることができる。
【００１７】
ここで、熱交換器７の近傍には、貯湯水入口側の温度センサ１５ａ、貯湯水出口側の温度センサ１５ｂ、浴槽水入口側の温度センサ１５ｃ、浴槽水出口側の温度センサ１５ｄが設けており、これらの温度センサで各部分の温度を検出し、この温度に基いて制御部５０が循環流量調整弁９を調整して追焚き加熱が行なわれる。
【００１８】
次に、浴槽水入口側の温度センサ１５ｃの入力値Ｔｃｉが操作部６０などであらかじめ設定されている浴槽水設定温度以上か否かを確認する（Ｓ７）。Ｔｃｉが設定温度以上ならば、循環ポンプ８をＯＦＦ、循環流量調整弁９を全閉にし、循環ポンプ１２をＯＦＦにして、浴槽１０内の追焚き加熱動作を停止し（Ｓ８）、追焚き制御を終了する（Ｓ９）。Ｔｃｉが設定温度未満ならば、追焚きを継続する。
【００１９】
ここで、追焚き運転をしていない場合に循環流量調整弁９が全閉になっていないと、貯湯タンク２内の湯の分布によるが、貯湯タンク２内が全量湯になっている場合、貯湯水循環回路６内の水と貯湯タンク２内の湯の比重差により貯湯水循環回路６も湯が対流し、風呂用熱交換器７が熱くなってしまい、追焚き運転開始時に浴槽１０に熱い湯が一時的に出てしまうので、追焚き運転をしていない時、又は浴槽水循環回路１１の循環ポンプ１２が動作していない時は、循環流量調整弁９を全閉とし、浴槽１０内に熱い湯が一時的に出ることを防止する。
【００２０】
このように、実施の形態１によれば、据え付け後、給湯器本体１に電源を投入し、沸き上げを開始するまでは、循環流量調整弁９を全開にしているので、貯湯水循環回路６の循環ポンプ８に呼び水ができて、第１回目の追焚き運転が正常にでき、一方、追焚き運転中以外には循環流量調整弁９を全閉にして追焚き動作開始時に浴槽１０内に熱い湯が一時的に出るのを防止できる。
【００２１】
実施の形態２．
図４は本発明の実施の形態２を示す貯湯式給湯器の沸き上げ制御のフローチャートである。
この実施の形態２では、給湯器本体１に電源が投入され、沸き上げ制御が開始されると（Ｓ３１）、制御部５０により貯湯タンク２に取付けてある発熱体４に通電される（Ｓ３２）。そして、沸き上げを開始してから所定時間（例えば１時間）経過後（Ｓ３３）、循環流量調整弁９は全閉にし、沸き上げ温度を貯湯タンク２に取付けてある温度センサ１４ａ，１４ｂで検出し、貯湯水が操作部６０で設定された温度（例えば９０℃）まで沸き上げると（Ｓ３５）、発熱体４への通電を停止して（Ｓ３６）、沸き上げ制御を終了する（Ｓ３７）。
【００２２】
このように、制御部５０は、沸き上げ開始から所定時間（１時間）経過後に、循環流量調整弁９を全閉にするよう制御しているが、実施の形態１と同様、貯湯タンク２と貯湯水循環回路６には水が満たされているので、第１回目の追焚き運転は正常にできる。
【００２３】
実施の形態３．
図５は本発明の実施の形態３を示す貯湯式給湯器の沸き上げ制御のフローチャートである。
この実施の形態３では、給湯器本体１に電源が投入され、沸き上げ制御が開始されると（Ｓ４１）、制御部５０により貯湯タンク２に取付けてある発熱体４に通電される（Ｓ４２）。そして、温度センサ１５ａ又は１５ｂが所定温度（例えば４５℃）を検出すると（Ｓ４３）、循環流量調整弁９は全閉にし（Ｓ４４）、沸き上げ温度を貯湯タンク２に取付けてある温度センサ１４ａ，１４ｂで検出し、貯湯水が操作部６０で設定された温度（例えば９０℃）まで沸き上げると（Ｓ４５）、発熱体４への通電を停止して（Ｓ４６）、沸き上げ制御を終了する（Ｓ４７）。
【００２４】
このように、制御部５０は、温度センサ１４ａ、１４ｂで所定温度（例えば４５℃）を検出後に、循環流量調整弁９を全閉にするよう制御しているもので、実施の形態１と同様、貯湯タンク２と貯湯水循環回路６には水が満たされているので、第１回目の追焚き運転は正常にできる。
【００２５】
【発明の効果】
以上のように、本発明に係る貯湯式給湯器によれば、据え付け後、電源を投入し、沸き上げを開始するまでは、循環流量調整手段を全開にするよう制御しているので、貯湯水循環回路の循環ポンプに呼び水ができて、第１回目の浴槽水の追焚き運転が正常にでき、追焚き運転中以外には循環流量調整手段を全閉にして追焚き運転開始時に浴槽内に熱い湯が出るのを防止できる。
【図面の簡単な説明】
【図１】本発明の実施の形態１を示す貯湯式給湯器の構成図である。
【図２】本発明の実施の形態１を示す貯湯式給湯器の沸き上げ制御のフローチャートである。
【図３】本発明の実施の形態１を示す貯湯式給湯器の追焚き制御のフローチャートである。
【図４】本発明の実施の形態２を示す貯湯式給湯器の沸き上げ制御のフローチャートである。
【図５】本発明の実施の形態３を示す貯湯式給湯器の沸き上げ制御のフローチャートである。
【符号の説明】
１　給湯器本体
２　貯湯タンク
６　貯湯水循環回路
７　熱交換器
８　循環ポンプ
９　環流量調整弁
１０　浴槽
１１　浴槽水循環回路
１２　循環ポンプ
１４ａ　温度センサ
１４ｂ　温度センサ
５０　制御部[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a hot water supply type hot water supply device having a reheating function for exchanging heat between hot water and bath water outside a hot water storage tank.
[0002]
[Prior art]
In a conventional hot water storage type water heater with a bathtub reheating function, at the time of reheating of the bathtub, a circulation pump is operated to take out high-temperature water from the upper part of the hot water storage tank into the circulation circuit, and the bath water is exchanged with a bath heat exchanger. Heat is exchanged, and reheating of bathtub water is performed while detecting the temperature of bathtub water. (For example, see Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-108292 A
[Problems to be solved by the invention]
However, in the conventional configuration as described above, depending on the distribution of hot water in the hot water storage tank, when the water in the hot water storage tank is completely hot water, the specific gravity difference between the water in the circulation circuit and the hot water in the hot water storage tank. The hot water circulates also in the hot water circulation circuit, and the bath heat exchanger becomes hot, causing a problem that hot water temporarily comes out of the bathtub at the start of the reheating operation. On the other hand, if the circulation circuit is closed by the time the reheating operation is started, there is a problem that the circulating pump runs idle and the reheating operation cannot be performed normally unless the circulation pump is primed after installation.
[0005]
The present invention has been made in order to solve the above-described problems, and prevents hot water from temporarily flowing out of a bathtub at the start of a reheating operation. On the other hand, the first reheating operation after installation is performed. It is an object of the present invention to provide a hot-water storage type water heater capable of normal operation.
[0006]
[Means for Solving the Problems]
A hot water storage type hot water supply device according to the present invention detects a temperature of hot water stored in a hot water storage tank in which hot water is supplied from a lower part and discharged from an upper part, heating means for heating hot water stored in the hot water storage tank, and hot water stored in the hot water storage tank. A temperature detecting means, a hot water circulation circuit for returning hot water taken out from an upper portion of the hot water storage tank to the hot water storage tank, a circulation pump provided in the hot water storage circuit, and a hot water bath and a bathtub water taken out of the hot water storage tank. A heat exchanger for exchanging heat with a bathtub water circulation circuit that circulates the bathtub water, a circulation pump provided in the bathtub water circulation circuit, and a hot water storage type water heater that includes a control unit that controls operation of the water heater. The hot water circulation circuit is provided with a circulating flow rate adjusting means for adjusting a circulating flow rate, and the control unit turns on the power of the hot water supply main body, and then starts a first boiling operation of the hot water by the heating means. It is configured to control so as to be fully opened to the circulation flow rate adjusting means.
[0007]
BEST MODE FOR CARRYING OUT THE INVENTION
Embodiment 1 FIG.
FIG. 1 is a configuration diagram of a hot water supply type water heater according to Embodiment 1 of the present invention, FIG. 2 is a flowchart at the time of boiling control, and FIG. 3 is a flowchart at the time of additional heating control. .
In FIG. 1, a hot water storage tank 2 is provided in a hot water supply body 1, and a heating element 4 for heating hot water is attached to the hot water storage tank 2. A water supply pipe 3 is connected to a lower portion of the hot water storage tank 2. The water supply pipe 3 is provided with a pressure reducing valve 3 a, and a hot water supply pipe 5 is connected to an upper part of the hot water storage tank 2. A relief valve 5 a is provided in the hot water supply pipe 5, and a hot water circulation circuit 6 is connected to upper and lower portions of the hot water storage tank 2. The hot water circulation circuit 6 exchanges heat between hot water stored in the hot water storage tank 2 and hot water in the bathtub 10, a circulation pump 8 for circulating hot water in the hot water storage tank 2 to the hot water circulation circuit 6, and hot water circulation. A circulation flow rate adjusting valve 9 for adjusting the circulation flow rate of hot water passing through the circuit 6 is provided. A bathtub water circulation circuit 11 is connected to the bathtub 10, and the bathtub water circulation circuit 11 includes a bathtub water circulation circuit 11a, a circulation pump 12 for circulating bathtub water, the heat exchanger 7, and a bathtub water return circulation circuit 11b. I have.
[0008]
Temperature sensors 14a and 14b for detecting the temperature of the internal hot water are attached to the outer surface of the hot water storage tank 2 at predetermined intervals. The hot water circulation circuit 6 is provided with a temperature sensor 15a for detecting the inlet temperature of the hot water to the heat exchanger 7 and a temperature sensor 15b for detecting the outlet temperature of the hot water from the heat exchanger 7. Further, the bath water circulation circuit 11 is provided with a temperature sensor 15c for detecting an inlet temperature of the bath water to the heat exchanger 7 and a temperature sensor 15d for detecting an outlet temperature of the bath water from the heat exchanger 7. The control unit 50 reads the detection values of the temperature sensors 14a, 14b, 15a, 15b, 15c, 15d, and controls the heating element 4, the circulation pumps 8, 12, and the circulation flow rate adjustment valve 9 based on the settings of the operation unit 60. And control the operation of the water heater.
[0009]
Here, depending on the adjustment of the circulation flow rate adjusting valve 9, the circulation amount of the hot water circulation circuit 6 increases or decreases, and the heating capacity for heating the bathtub 10 changes. When the circulation flow rate regulating valve 9 is fully opened, the heating capacity is maximum, and when the circulation amount of the hot water circulation circuit 6 is reduced, the heating capacity decreases, but the temperature of the hot water returning to the bathtub 10 can also be lowered.
[0010]
Next, the operation of the boiling control of the hot water supply type water heater in the first embodiment will be described with reference to the flowchart of FIG.
Until power is supplied to the water heater main body 1, the circulation flow rate regulating valve 9 is fully opened, and the water supplied from the water supply pipe 3 is reduced to a predetermined pressure by the pressure reducing valve 3 and supplied to the hot water storage tank 2, The hot water storage tank 2 and the hot water circulation circuit 6 are filled with water.
[0011]
When the power is supplied to the water heater main body 1 and the boiling control is started (S21), the circulation flow rate regulating valve 9 is fully closed by the control unit 50 (S22), and the heating element 4 attached to the hot water storage tank 2 is opened. Is energized (S23). Then, the boiling temperature is detected by the temperature sensors 14a and 14b attached to the hot water storage tank 2, and when the hot water is heated to the temperature (for example, 90 ° C.) set by the operation unit 60 (S24), the heat is output to the heating element 4. Is stopped (S25), and the boiling control is terminated (S26).
[0012]
At this time, immediately after the start of boiling, the control unit 50 controls the circulation flow rate regulating valve 9 to be fully closed, but since the hot water storage tank 2 and the hot water circulation circuit 6 are filled with water, the first time Refire operation can be performed normally.
Thereafter, since the circulation flow rate adjusting valve 9 is fully closed, the hot water circulation circuit 6 is shut off, and the hot water in the hot water storage tank 2 does not convect the hot water circulation circuit 6, so that the heat exchanger 7 does not become hot, and Hot water does not flow out of the bathtub 10 at the start of the reheating operation.
The expansion water in the hot water storage tank 2 at the time of boiling is discharged from the relief valve 5a.
When hot water is supplied to a general faucet or the like, the faucet is opened, hot water is supplied through the hot water supply pipe 5 with the power of the water source water pressure, and water is supplied to the lower part of the hot water storage tank 2.
[0013]
Next, the operation of the additional heating control of the bathtub water in the first embodiment will be described with reference to the flowchart of FIG.
Here, for the following description, the input value which is the detected temperature of the storage water inlet temperature sensor 15a of the heat exchanger 7 is Thi, the input value which is the detected temperature of the storage water outlet temperature sensor 15b is Th, and the bathtub water inlet temperature. The input value as the detected temperature of the sensor 15c is defined as Tci, and the input value as the detected temperature of the bathtub water outlet temperature sensor 15d is defined as Tco.
[0014]
In FIG. 3, when the reheating control is started by operating the operation unit 60 (S1), first, the circulation pump 12 is operated, the hot water in the bathtub 10 is guided to the bathtub water circulation circuit 11, and the heat exchanger 7 is turned on. Then, it is returned into the bathtub 10 (S2). After a lapse of a predetermined time (for example, 60 seconds) after operating the circulation pump 12 (S3), the input value Tci, which is the temperature detected by the temperature sensor 15c on the bathtub water inlet side, and the temperature detected by the temperature sensor 15d on the bathtub water outlet side. The difference from the input value Tco is compared (S4). Since the temperature of the heat exchanger 7 is equal to the internal temperature of the water heater main body 1 (for example, 40 ° C.), Tci and Tco become the bathtub water temperature, and the temperature sensor 15c on the bathtub water inlet side and the temperature sensor 15d on the bathtub water outlet side are detected. If it is a normal product, there is almost no temperature difference between Tci and Tco.
[0015]
Therefore, it is compared whether the temperature difference between Tci and Tco is within a predetermined temperature (for example, 10 ° C.) (S4). If the temperature difference between Tci and Tco is within a predetermined temperature (for example, 10 ° C.), temperature sensors 15c and 15d are used. Are determined to be normal (S5), and the additional heating operation is continued. If the temperature difference between Tci and Tco is equal to or higher than a predetermined temperature (for example, 10 ° C.), either the temperature sensor 15c on the bathtub water inlet side or the temperature sensor 15d on the bathtub water outlet side is abnormal (has a malfunction). It is determined that there is (S10), and the subsequent additional heating operation is prohibited. (S11)
[0016]
When it is determined in step S5 that the temperature sensor 15c on the bathtub water inlet side and the temperature sensor 15d on the bathtub water outlet side are normal, the circulating flow control valve 9 is switched from fully closed to fully open, and the circulating pump 8 also starts operating. Then, hot water stored in the hot water is guided from the upper portion of the hot water storage tank 2 to the hot water storage circuit 6 and returned to the lower portion of the hot water storage tank 2 through the heat exchanger 7 to start the additional heating operation (S6). At this time, the heat exchanger 7 heat-exchanges (heat-transfers) the high-temperature hot water stored in the hot-water storage tank 2 to the low-temperature bath water to heat the bath water to a temperature suitable for bathing. be able to.
[0017]
Here, near the heat exchanger 7, there are provided a temperature sensor 15a on the hot water inlet side, a temperature sensor 15b on the hot water outlet side, a temperature sensor 15c on the bath water inlet side, and a temperature sensor 15d on the bath water outlet side. The temperature of each part is detected by these temperature sensors, and the control unit 50 adjusts the circulating flow rate adjusting valve 9 based on the detected temperature to perform additional heating.
[0018]
Next, it is confirmed whether or not the input value Tci of the temperature sensor 15c on the bathtub water inlet side is equal to or higher than a bathtub water set temperature preset by the operation unit 60 or the like (S7). If Tci is equal to or higher than the set temperature, the circulation pump 8 is turned off, the circulation flow rate regulating valve 9 is fully closed, the circulation pump 12 is turned off, the reheating operation in the bathtub 10 is stopped (S8), and the reheating control is performed. Is completed (S9). If Tci is lower than the set temperature, the reheating is continued.
[0019]
Here, if the circulation flow rate adjusting valve 9 is not fully closed when the additional heating operation is not performed, depending on the distribution of hot water in the hot water storage tank 2, if the hot water storage tank 2 is fully hot, Due to the difference in specific gravity between the water in the hot water circulation circuit 6 and the hot water in the hot water storage tank 2, the hot water also convects in the hot water circulation circuit 6, so that the bath heat exchanger 7 becomes hot. When the reheating operation is not performed, or when the circulation pump 12 of the bathtub water circulation circuit 11 is not operating, the circulation flow control valve 9 is fully closed, and the hot water in the bathtub 10 is discharged. Prevents hot water from flowing out temporarily.
[0020]
As described above, according to the first embodiment, after installation, power is supplied to water heater main body 1 and circulating flow regulating valve 9 is fully opened until boiling is started. The circulating pump 8 is primed, and the first reheating operation can be performed normally. On the other hand, except during the reheating operation, the circulation flow rate regulating valve 9 is fully closed and hot water is stored in the bathtub 10 at the start of the reheating operation. Hot water can be prevented from flowing out temporarily.
[0021]
Embodiment 2 FIG.
FIG. 4 is a flowchart of the boiling control of the hot-water storage type water heater according to the second embodiment of the present invention.
In the second embodiment, when the power is turned on to the water heater main body 1 and the boiling control is started (S31), the heating unit 4 attached to the hot water storage tank 2 is energized by the control unit 50 (S32). . After a lapse of a predetermined time (for example, one hour) from the start of boiling (S33), the circulation flow rate regulating valve 9 is fully closed, and the boiling temperature is detected by the temperature sensors 14a and 14b attached to the hot water storage tank 2. Then, when the hot water rises to the temperature (for example, 90 ° C.) set by the operation unit 60 (S35), the power supply to the heating element 4 is stopped (S36), and the boiling control ends (S37).
[0022]
As described above, the control unit 50 controls the circulation flow rate regulating valve 9 to be fully closed after a predetermined time (one hour) has elapsed from the start of boiling. Since the hot water circulation circuit 6 is filled with water, the first reheating operation can be performed normally.
[0023]
Embodiment 3 FIG.
FIG. 5 is a flowchart of the boiling control of the hot-water storage type water heater according to Embodiment 3 of the present invention.
In the third embodiment, when the power is turned on to the water heater main body 1 and the boiling control is started (S41), the control unit 50 supplies electricity to the heating element 4 attached to the hot water storage tank 2 (S42). . Then, when the temperature sensor 15a or 15b detects a predetermined temperature (for example, 45 ° C.) (S43), the circulating flow regulating valve 9 is fully closed (S44), and the boiling temperature is set to the temperature sensor 14a, When the hot water is detected at 14b and rises to the temperature (for example, 90 ° C.) set by the operation unit 60 (S45), the power supply to the heating element 4 is stopped (S46), and the boiling control is terminated (S46). S47).
[0024]
As described above, the control unit 50 controls the circulating flow regulating valve 9 to be fully closed after detecting the predetermined temperature (for example, 45 ° C.) by the temperature sensors 14a and 14b, which is the same as in the first embodiment. Since the hot water storage tank 2 and the hot water circulation circuit 6 are filled with water, the first additional heating operation can be performed normally.
[0025]
【The invention's effect】
As described above, according to the hot water supply type water heater according to the present invention, since the power is turned on after installation and the circulation flow rate adjusting means is controlled to be fully opened until the start of boiling, the hot water circulation is performed. The circulating pump of the circuit is primed, the first reheating operation of the bathtub water can be performed normally, and except during the reheating operation, the circulating flow rate adjusting means is fully closed and hot water is stored in the bathtub at the start of the reheating operation. Hot water can be prevented from flowing out.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a hot-water storage type water heater according to a first embodiment of the present invention.
FIG. 2 is a flowchart of a boiling control of the hot-water storage type water heater showing the first embodiment of the present invention.
FIG. 3 is a flowchart of additional heating control of the hot water supply type water heater according to the first embodiment of the present invention.
FIG. 4 is a flowchart of boiling control of a hot-water storage type water heater according to Embodiment 2 of the present invention.
FIG. 5 is a flowchart of boiling control of a hot-water storage type water heater according to Embodiment 3 of the present invention.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Hot water supply main body 2 Hot water storage tank 6 Hot water circulation circuit 7 Heat exchanger 8 Circulation pump 9 Ring flow control valve 10 Bath tub 11 Bath tub water circulation circuit 12 Circulation pump 14a Temperature sensor 14b Temperature sensor 50 Controller

Claims

A hot water storage tank that is supplied with water from a lower part and is discharged from an upper part, a heating unit that heats the hot water stored in the hot water storage tank, a temperature detection unit that detects a temperature of the hot water stored in the hot water storage tank, and an upper part of the hot water storage tank A hot water circulation circuit for returning hot water taken out of the hot water storage tank to the hot water storage tank, a circulation pump provided in the hot water storage circuit, a heat exchanger for exchanging heat between the hot water and the bath water taken out of the hot water storage tank, A bath water circulation circuit that circulates bath water, a circulation pump provided in the bath water circulation circuit, and a hot water storage type water heater that includes a control unit that controls operation of the water heater,
The hot water circulation circuit is provided with a circulating flow rate adjusting means for adjusting a circulating flow rate, and the control unit, after turning on the power to the water heater main body, until the first boiling operation of the hot water by the heating means starts. A hot-water storage type water heater characterized in that the circulation flow rate adjusting means is controlled to be fully opened.

The control unit controls the circulation flow rate adjustment unit to be fully closed when a predetermined time has elapsed after the first boiling operation of the stored water by the heating unit is started after the power is supplied to the water heater main body. The hot-water storage type water heater according to claim 1, characterized in that:

The control unit, after turning on the power to the water heater main body, completely closes the circulating flow rate adjusting unit when the temperature detecting unit detects a predetermined temperature after the first boiling operation of the hot water by the heating unit is started. The hot-water storage type hot water supply device according to claim 1, wherein the hot water storage device is controlled so as to be as follows.

The control unit, after turning on the power to the water heater main body, a predetermined time has elapsed since the first boiling operation of the stored water by the heating means has started, and when the temperature detecting means detects a predetermined temperature, 2. The hot water supply type hot water supply device according to claim 1, wherein the circulation flow rate adjusting means is controlled to be fully closed.

After the first boiling operation of the hot water stored by the heating means, the control unit controls the circulation flow rate adjusting means to be fully closed at times other than the reheating operation. Item 5. A hot water supply type water heater according to any one of Items 1 to 4.

After the first boiling operation of the hot water by the heating unit, the control unit controls the circulation flow rate adjustment unit to be fully closed when the circulation pump is not operating in the bathtub water circulation circuit. The hot water supply type hot water supply device according to any one of claims 1 to 4, characterized in that: