JP2001041573A5 - - Google Patents

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JP2001041573A5
JP2001041573A5 JP1999219718A JP21971899A JP2001041573A5 JP 2001041573 A5 JP2001041573 A5 JP 2001041573A5 JP 1999219718 A JP1999219718 A JP 1999219718A JP 21971899 A JP21971899 A JP 21971899A JP 2001041573 A5 JP2001041573 A5 JP 2001041573A5
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【書類名】 明細書
【発明の名称】 給湯機
【特許請求の範囲】
【請求項1】 圧縮機、凝縮器、減圧器、蒸発器とが冷媒流路で接続して構成するヒートポンプと、蓄熱タンクと、この蓄熱タンクの出湯管途中に設けた燃焼バーナーの熱により加熱される熱交換器と、前記蓄熱タンクの下部から循環ポンプを介して前記凝縮器に導かれ前記蓄熱タンクへ戻される循環流路と、前記循環流路から切換弁を介し前記熱交換器の出口側に接続される分岐流路とを備え、前記蓄熱タンク下部の水を前記循環ポンプにより前記分岐流路を介して前記熱交換器へ循環させ、前記熱交換器の残熱を前記蓄熱タンクへ回収する給湯機。
【請求項2】 タンク出湯管の水の流れを検出する流量検知手段と、この流量検知手段により流量が無くなったことを検知し燃焼バーナーの燃焼を停止すると同時に循環流路が分岐流路に接続するように切換弁を切り換え循環ポンプを駆動する制御手段とを備えた請求項1記載の給湯機。
【請求項3】 蓄熱タンクと熱交換器との間のタンク出湯管水温を検知するタンク出湯管水温検知手段と、このタンク出湯管水温検知手段の検知水温が予め設定された所定温度になるように循環水量を調節する制御手段とを備えた請求項2記載の給湯機。
【請求項4】 循環水量の調節は循環ポンプの回転数調節で行う請求項3記載の給湯機。
【請求項5】 熱交換器の温度を検知する熱交換器温度検知手段と、この熱交換器温度検知手段の検出温度が所定温度より低下すれば循環ポンプを停止する制御手段を備えた請求項2記載の給湯機。
【請求項6】 バーナーの温度を検知するバーナー温度検知手段と、このバーナー温度検知手段の検出温度が所定温度より低下すれば循環ポンプを停止する制御手段を備えた請求項2記載の給湯機。
【発明の詳細な説明】
【0001】
【発明の属する技術分野】
本発明はヒートポンプと燃焼とを利用した給湯機に関するものである。
【0002】
【従来の技術】
従来、この種の給湯機は特開昭59−195048号公報に示す如きものがある。以下、従来の技術について図面に基づき説明する。図6は従来の給湯機の構成図である。図6において、蓄熱タンク1下部の水は循環ポンプ2を介してヒートポンプ3の凝縮器4と熱交換する熱交換器4aから燃焼給湯機5の熱交換器6を経て蓄熱タンク1上部に戻される。そして、蓄熱タンク1内の水はヒートポンプ3で中間温度まで昇温されたのち、燃焼給湯機5で80℃の高温まで昇温貯湯される。なお、図6中の7は圧縮機、8は減圧器、9は蒸発器を示し、ヒートポンプ3を構成している。また、10は燃焼バーナー、1aは蓄熱タンク1内の湯温の湯温検知手段である。
【0003】
【発明が解決しようとする課題】
上記する従来の給湯機では、蓄熱タンク1内の湯温を常時80℃の高温に保持しているため、放熱損失が大きい。また、出湯に必要な湯量を蓄熱タンク1に確保しておく必要性から蓄熱タンク1容積が大きくなり、設置スペース上の課題がある。
【0004】
本発明は上記課題を解決するものであり、放熱損失の低減と蓄熱タンクの小型化をはかることを主目的とするものである。
【0005】
【課題を解決するための手段】
前記課題を解決するため、本発明は、圧縮機、凝縮器、減圧器、蒸発器とが冷媒流路で接続して構成するヒートポンプと、蓄熱タンクと、この蓄熱タンクの出湯管途中に設けた燃焼バーナーの熱により加熱される熱交換器と、前記蓄熱タンクの下部から循環ポンプを介して前記凝縮器に導かれ前記蓄熱タンクへ戻される循環流路と、前記循環流路から切換弁を介し前記熱交換器の出口側に接続される分岐流路とを備え、前記蓄熱タンク下部の水を前記循環ポンプにより前記分岐流路を介して前記熱交換器へ循環させ、前記熱交換器の残熱を前記蓄熱タンクへ回収するようにしたものである。
【0006】
以上の構成により、蓄熱タンク内の水はヒートポンプの運転で予め設定された所定温度に蓄熱して貯湯される。所定温度は通常ヒートポンプの効率が十分確保され、また、通常出湯温度以上である50〜55℃の中間温度であるため、蓄熱タンクの放熱損失が低減される。また、蓄熱タンクの出湯管途中に設けた燃焼バーナーの熱により加熱される熱交換器を備えたことで、蓄熱タンクの湯温が低下した場合、または、高温度の出湯が必要な場合には燃焼による昇温が出来るので、蓄熱タンクを必要最小限の大きさに設定できるため、蓄熱タンクの小型化が図れる。さらに、出湯により蓄熱タンクの湯温が低下したときは、湯温検知手段とヒートポンプ制御手段によりヒートポンプ運転が行われることで、効率の良い運転ができる。さらに、循環流路から切換弁を介して分岐流路を前記熱交換器の出口側に接続したことで、出湯停止で燃焼バーナーの燃焼停止時に切換弁と循環ポンプを作動させて、蓄熱タンク下部の水を分岐流路を通して熱交換器へ循環させ、熱交換器の残熱を取り、蓄熱タンクへ回収できるため、通水停止による熱交換器の温度異常上昇が防止でき、また、熱効率が向上する。
【0007】
【発明の実施の形態】
前記課題を解決する給湯機は各請求項に記載した実施形態により実現できる。本発明の請求項1に記載の発明は、圧縮機、凝縮器、減圧器、蒸発器とが冷媒流路で接続して構成するヒートポンプと、蓄熱タンクと、この蓄熱タンクの出湯管途中に設けた燃焼バーナーの熱により加熱される熱交換器と、前記蓄熱タンクの下部から循環ポンプを介して前記凝縮器に導かれ前記蓄熱タンクへ戻される循環流路と、前記循環流路から切換弁を介し前記熱交換器の出口側に接続される分岐流路とを備え、前記蓄熱タンク下部の水を前記循環ポンプにより前記分岐流路を介して前記熱交換器へ循環させ、前記熱交換器の残熱を前記蓄熱タンクへ回収する。これにより、蓄熱タンク内の水はヒートポンプの運転で予め設定された所定温度に蓄熱されて貯湯される。所定温度は通常ヒートポンプの効率が十分確保され、また、通常出湯温度以上である50〜55℃の中間温度であるため、蓄熱タンクの放熱損失が低減される。また、蓄熱タンクの出湯管途中に設けた燃焼バーナーの熱により加熱される熱交換器を備えたことで、蓄熱タンクの湯温が低下した場合、または、高温度の出湯が必要な場合には燃焼による昇温が出来るので、蓄熱タンクを必要最小限の大きさに設定できるため、蓄熱タンクの小型化が図れる。さらに、循環流路から切換弁を介して分岐流路を前記熱交換器の出口側に接続したことで、出湯停止で燃焼バーナーの燃焼停止時に切換弁と循環ポンプを作動させて、蓄熱タンク下部の水を分岐流路を通して熱交換器へ循環させ、熱交換器の残熱を取り、蓄熱タンクへ回収できるため、通水停止による熱交換器の温度異常上昇が防止でき、また、熱効率が向上する。
【0008】
また、請求項2に記載の発明は、請求項1の発明に加えて、タンク出湯管の水の流れを検出する流量検知手段と、この流量検知手段により流量が無くなったことを検知し燃焼バーナーの燃焼を停止すると、同時に循環流路から分岐流路に流れるように切換弁を切り換え循環ポンプを駆動する制御手段とを備えることにより、出湯停止検知と出湯停止後の動作が確実となり、信頼性が向上する。
【0009】
また、請求項3に記載の発明は、請求項2の発明に加えて、蓄熱タンクと熱交換器との間のタンク出湯管水温を検知するタンク出湯管水温検知手段と、このタンク出湯管水温検知手段の検知水温が蓄熱タンクの湯温と同等の所定温度になるように循環水量を調節する制御手段を備える構成とすることにより、熱交換器の残熱を蓄熱タンクへ安定した湯温として回収できる。
【0010】
また、請求項4に記載の発明は、請求項3の発明に加えて、循環水量の調節は循環ポンプの回転数調節で行う構成とすることにより、循環水量調節のために特別な弁等の部品を追加する必要がない。
【0011】
また、請求項5に記載の発明は、請求項2の発明に加えて、熱交換器の温度を検知する熱交換器温度検知手段と、この熱交換器温度検知手段の検出温度が所定温度より低下したら循環ポンプの停止を行う制御手段を備える構成とすることにより、熱交換器の冷やしすぎを防止し、次の出湯時の湯温立ち上げを早くできる。
【0012】
また、請求項6に記載の発明は、請求項2の発明に加えて、バーナーの温度を検知するバーナー温度検知手段と、このバーナー温度検知手段の検出温度が所定温度より低下したら循環ポンプの停止を行う制御手段を備える構成とすることにより、バーナーの冷やしすぎを防止し、次の出湯時の湯温立ち上げを早くできる。
【0013】
【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。なお、各実施例において、同じ構成、同じ動作をする部分については同一符号を付し、重複説明を避ける。
【0014】
(実施例1)
図1は本発明の実施例1における給湯機の構成図である。
【0015】
図1において、ヒートポンプ11は圧縮機12、凝縮器13、減圧器14、蒸発器15を冷媒流路で接続して構成する。16は蓄熱タンクで、この蓄熱タンク16の湯温を検出する湯温検知手段17を有する。蓄熱タンク16の下部からの水が、循環ポンプ18によって凝縮器13に導かれ、凝縮器13の熱で加熱昇温されて蓄熱タンク16へ戻される循環流路19を構成する。蓄熱タンク16の下部には、水道水などが給水される管路20が、上部には、タンク出湯管21が設けられ、このタンク出湯管21の端末カラン22までの途中に、燃焼給湯機23を構成する燃焼バーナー24の熱により加熱される熱交換器25が配置される。26は分岐流路で循環流路19と熱交換機器25の出口側とを接続する。27は切換弁で循環流路19の流れを蓄熱タンク16か分岐流路26かへ選択切換する。
【0016】
以上の構成において、その動作、作用について説明する。まず、電源(図示せず)を入れると、切換弁27は循環流路19の流れを蓄熱タンク16側へ設定されており、ヒートポンプ11と循環ポンプ18の運転を開始し、蓄熱タンク16内の水を所定温度(50〜55℃)まで沸き上げる。通常出湯時は蓄熱タンク16内の湯温が50〜55℃であるために、燃焼バーナー24は点火せず、蓄熱タンク16の湯温が低下した場合、または、高温度の出湯が必要な場合に燃焼による昇温が行われる。よって、通常出湯温度以上である50〜55℃の中間温度であるため、蓄熱タンク16の放熱損失が低減される。
【0017】
また、蓄熱タンク16と出湯する端末カラン22との間のタンク出湯管21途中に設けた燃焼バーナー24の熱により加熱される熱交換器25を備えたことで、蓄熱タンク16の湯温が低下した場合、または、高温度の出湯が必要な場合には燃焼による昇温が出来るので、蓄熱タンク16を必要最小限の大きさに設定できるため、蓄熱タンク16の小型化が図れる。
【0018】
さらに、循環流路19から切換弁27を介して分岐流路26を熱交換器25の出口側に接続したことで、出湯停止で燃焼バーナー24の燃焼停止時に切換弁27を循環流路19の流れが分岐流路26へ切換えて循環ポンプ18を作動させることにより、蓄熱タンク16下部の水が分岐流路26を通して熱交換器25へ循環され、熱交換器26の残熱を取り、蓄熱タンク16へ回収させることができる。このように、通水停止による熱交換器25の温度異常上昇が防止でき、また、熱効率が向上する。図1において、切換弁27を凝縮器13の下流側に配置しているが、凝縮器13の上流側(循環ポンプ18と凝縮器13の間)に配置しても同じ作用、効果が得られることは明らかである。
【0019】
(実施例2)
図2は本発明の実施例2における給湯機の構成図である。図2において、28はタンク出湯管21の水の流れを検出する流量検知手段、29は制御手段で流量検出部30,流量比各部31,バーナー運転手段32,循環ポンプ運転手段33、切換弁切換手段34で構成されている。
【0020】
以上の構成において、その動作、作用について説明する。
【0021】
出湯の終了で、端末カラン22を閉じると、タンク出湯管21内の水の流れが無くなる。すると、制御手段29の流量検出部30で流量検知手段28より発信された信号を読み取り、流量比較部31で流量が無くなったことを判定し、その時点で燃焼バーナー24が運転されていたら、バーナー運転手段32により燃焼バーナー24の運転を停止し、同時に、切換弁切換手段34により切換弁27を循環流路19が分岐流路26に接続するように切り換え、循環ポンプ運転手段33により循環ポンプ18を駆動する。
【0022】
上記動作を行う制御手段29を備えたことで、出湯停止検知と出湯停止後の動作が確実となり、信頼性が向上する。なお、出湯の終了時点で燃焼バーナー24が運転されていない場合は、上記動作はおこなわれない。図2において、流量検知手段28を蓄熱タンク16と熱交換器25の間に設置しているが、熱交換器25と端末カラン22の間に設置しても同じ作用、効果が得られることは明らかである。
【0023】
(実施例3)
図3は本発明の実施例3における給湯機の構成図である。図3において、図2と異なる点は、蓄熱タンク17と熱交換器25との間のタンク出湯管21の水温を検知するタンク出湯管水温検知手段35を設け、制御手段29内にタンク出湯管水温検出部36、タンク出湯管水温比較部37を有する点である。
【0024】
以上の構成において、その動作、作用について説明する。
【0025】
出湯の終了で、端末カラン22を閉じると、タンク出湯管21内の水の流れが無くなる。すると、制御手段29の流量検出部30で流量検知手段28より発信された信号を読み取り、流量比較部31で流量が無くなったことを判定し、その時点で燃焼バーナー24が運転されていたら、バーナー運転手段32により燃焼バーナー24の運転を停止し、同時に、切換弁切換手段34により切換弁27を循環流路19が分岐流路26に接続するように切り換え、循環ポンプ運転手段33により循環ポンプ18を駆動する。この時、タンク出湯管水温検出部36でタンク出湯管水温検知手段35より発信された信号を読み取り、タンク出湯管水温比較部37で検出温度が予め設定された蓄熱タンク16の湯温と同等の所定温度になるように循環ポンプ運転手段33により循環ポンプ18の回転数を調節して、循環水量を調節する予め設定された所定温度は、通常蓄熱タンク16に貯湯される湯温と同等かそれ以上の温度とする。
【0026】
このように、蓄熱タンク16と熱交換器25との間のタンク出湯管21の水温を検知するタンク出湯管水温検知手段35と、このタンク出湯管水温検知手段35の検知水温が蓄熱タンク16の湯温と同等かそれ以上の温度の所定温度になるように循環水量を調節する制御手段29を備える構成とすることにより、熱交換器25の残熱を蓄熱タンク16内に貯湯されている湯温を乱すことなく安定した湯温として回収できる。また、循環水量の調節を循環ポンプ18の回転数調節で行うことにより、循環水量調節のために特別な弁等の部品を追加する必要がない。
【0027】
(実施例4)
図4は本発明の実施例4における給湯機の構成図である。図4において、図3と異なる点は、熱交換器25の温度を検知する熱交換器温度検知手段38を設け、制御手段29内に熱交換器温度検出部39、熱交換器温度比較部40を有する点である。
【0028】
以上の構成において、その動作、作用について説明する。出湯停止で燃焼バーナー24の燃焼停止時に切換弁27と循環ポンプ18を作動させているときに、熱交換器温度検出部39で熱交換器温度検知手段38より発信された信号を読み取り、熱交換器温度比較部40で検出温度が予め設定された所定温度より低下したことを判定したら循環ポンプ運転手段33に指令を送り、循環ポンプの停止を行う。上記予め設定される所定温度は熱交換器25の内部水が沸騰しない温度50〜90℃好ましくは60〜70℃に設定する。このように、熱交換器25の温度を検知する熱交換器温度検知手段35と、この熱交換器温度検知手段35の検出温度が所定温度より低下すれば循環ポンプ18を停止する制御手段29を備える構成とすることにより、熱交換器25の冷やしすぎを防止し、次の出湯時の湯温立ち上げを早くできる。
【0029】
(実施例5)
図5は本発明の実施例5における給湯機の構成図である。図5において、図4と異なる点は、燃焼バーナー24の温度を検知するバーナー温度検知手段41を設け、制御手段29内にバーナー温度検出部42、バーナー温度比較部43を有する点である。
【0030】
以上の構成において、その動作、作用について説明する。出湯停止で燃焼バーナー24の燃焼停止時に切換弁27と循環ポンプ18を作動させているときに、バーナー温度検出部42でバーナー温度検知手段41より発信された信号を読み取り、バーナー温度比較部43で検出温度が予め設定された所定温度より低下したことを判定したら循環ポンプ運転手段33に指令を送り、循環ポンプの停止を行う。このように、燃焼バーナー24の温度を検知するバーナー温度検知手段41と、このバーナー温度検知手段41の検出温度が所定温度より低下すれば循環ポンプ18を停止する制御手段29を備える構成とすることにより、燃焼バーナー24の冷やしすぎを防止し、次の出湯時の湯温立ち上げを早くできる。
【0031】
なお、本発明ではヒートポンプと燃焼とを組み合わせた給湯機の構成で説明したが、蓄熱タンクと循環ポンプとを有する他の燃焼給湯機構成に応用しても同様の効果が得られる。
【0032】
【発明の効果】
以上の説明からも明らかのように、本発明によれば、蓄熱タンク内の水はヒートポンプの運転で予め設定された中間温度に蓄熱されて貯湯されるため、ヒートポンプの効率が十分確保され、蓄熱タンクの放熱損失が低減される。また、蓄熱タンクの出湯管途中に設けた燃焼バーナーの熱により加熱される熱交換器を備えたことで、蓄熱タンクの湯温が低下した場合、または、高温度の出湯が必要な場合には燃焼による昇温が出来るので、蓄熱タンクを必要最小限の大きさに設定できるため、蓄熱タンクの小型化が図れる。さらに、循環流路から切換弁を介して分岐流路を前記熱交換器の出口側に接続したことで、出湯停止で燃焼バーナーの燃焼停止時に切換弁と循環ポンプを作動させて、蓄熱タンク下部の水を分岐流路を通して熱交換器へ循環させ、熱交換器の残熱を取り、蓄熱タンクへ回収できるため、通水停止による熱交換器の温度異常上昇が防止でき、また、熱効率が向上する。
【図面の簡単な説明】
【図1】
本発明の実施例1における給湯機の構成図
【図2】
本発明の実施例2における給湯機の構成図
【図3】
本発明の実施例3における給湯機の構成図
【図4】
本発明の実施例4における給湯機の構成図
【図5】
本発明の実施例5における給湯機の構成図
【図6】
従来の給湯機の構成図
【符号の説明】
11 ヒートポンプ
12 圧縮機
13 凝縮器
14 減圧器
15 蒸発器
16 蓄熱タンク
18 循環ポンプ
19 循環流路
21 タンク出湯管
24 燃焼バーナー
25 熱交換器
26 分岐流路
27 切換弁
28 流量検知手段
29 制御手段
35 タンク出湯管水温検知手段
38 熱交換機温度検知手段
41 バーナー温度検知手段
[Document name] Specification [Title of invention] Water heater [Claims]
1. A heat pump composed of a compressor, a condenser, a decompressor, and an evaporator connected by a refrigerant flow path, a heat storage tank, and heating by the heat of a combustion burner provided in the middle of a hot water discharge pipe of the heat storage tank. Heat exchanger to be used, a circulation flow path that is guided from the lower part of the heat storage tank to the condenser via a circulation pump and returned to the heat storage tank, and an outlet of the heat exchanger from the circulation flow path via a switching valve. A branch flow path connected to the side is provided, water at the bottom of the heat storage tank is circulated to the heat exchanger via the branch flow path by the circulation pump, and the residual heat of the heat exchanger is circulated to the heat storage tank. Water heater to collect.
2. A flow rate detecting means for detecting the flow of water in a hot water pipe of a tank, and a flow rate detecting means for detecting that the flow rate has disappeared to stop combustion of a combustion burner and at the same time connecting a circulation flow path to a branch flow path. The water heater according to claim 1, further comprising a control means for switching a switching valve and driving a circulation pump.
3. The tank hot water pipe water temperature detecting means for detecting the water temperature of the tank hot water pipe between the heat storage tank and the heat exchanger, and the detection water temperature of the tank hot water pipe water temperature detecting means so as to be a preset predetermined temperature. The water heater according to claim 2, further comprising a control means for adjusting the amount of circulating water.
4. The water heater according to claim 3, wherein the amount of circulating water is adjusted by adjusting the rotation speed of the circulation pump.
5. A claim comprising a heat exchanger temperature detecting means for detecting the temperature of the heat exchanger and a control means for stopping the circulation pump when the detected temperature of the heat exchanger temperature detecting means falls below a predetermined temperature. 2 The water heater described.
6. The water heater according to claim 2, further comprising a burner temperature detecting means for detecting the temperature of the burner and a control means for stopping the circulation pump when the detection temperature of the burner temperature detecting means falls below a predetermined temperature.
Description: TECHNICAL FIELD [Detailed description of the invention]
[0001]
[Technical field to which the invention belongs]
The present invention relates to a water heater using a heat pump and combustion.
0002.
[Conventional technology]
Conventionally, there is a water heater of this type as shown in Japanese Patent Application Laid-Open No. 59-195048. Hereinafter, the conventional technique will be described with reference to the drawings. FIG. 6 is a configuration diagram of a conventional water heater. In FIG. 6, the water in the lower part of the heat storage tank 1 is returned from the heat exchanger 4a that exchanges heat with the condenser 4 of the heat pump 3 via the circulation pump 2 to the upper part of the heat storage tank 1 via the heat exchanger 6 of the combustion water heater 5. .. Then, the water in the heat storage tank 1 is heated to an intermediate temperature by the heat pump 3, and then heated and stored to a high temperature of 80 ° C. by the combustion water heater 5. In FIG. 6, 7 is a compressor, 8 is a decompressor, and 9 is an evaporator, which constitutes a heat pump 3. Reference numeral 10 is a combustion burner, and 1a is a means for detecting the temperature of the hot water in the heat storage tank 1.
0003
[Problems to be Solved by the Invention]
In the conventional water heater described above, since the hot water temperature in the heat storage tank 1 is always maintained at a high temperature of 80 ° C., heat dissipation loss is large. Further, since it is necessary to secure the amount of hot water required for hot water discharge in the heat storage tank 1, the volume of the heat storage tank 1 becomes large, which poses a problem in terms of installation space.
0004
The present invention solves the above problems, and an object of the present invention is to reduce heat dissipation loss and downsize the heat storage tank.
0005
[Means for solving problems]
In order to solve the above problems, the present invention provides a heat pump, a heat storage tank, and a hot water discharge pipe of the heat storage tank, which are configured by connecting a compressor, a condenser, a decompressor, and an evaporator by a refrigerant flow path. A heat exchanger heated by the heat of the combustion burner, a circulation flow path that is guided from the lower part of the heat storage tank to the condenser via a circulation pump and returned to the heat storage tank, and a switching valve from the circulation flow path. A branch flow path connected to the outlet side of the heat exchanger is provided, and water in the lower part of the heat storage tank is circulated to the heat exchanger through the branch flow path by the circulation pump, and the remainder of the heat exchanger is provided. The heat is recovered to the heat storage tank .
0006
With the above configuration, the water in the heat storage tank is stored at a predetermined temperature set in advance by the operation of the heat pump. Since the predetermined temperature is an intermediate temperature of 50 to 55 ° C., which is usually higher than the normal hot water temperature, the efficiency of the heat pump is sufficiently ensured, so that the heat dissipation loss of the heat storage tank is reduced. In addition, if the heat exchanger that is heated by the heat of the combustion burner installed in the middle of the hot water discharge pipe of the heat storage tank is provided, the hot water temperature of the heat storage tank drops, or if high temperature hot water is required to be discharged. Since the temperature can be raised by combustion, the heat storage tank can be set to the minimum required size, so that the heat storage tank can be miniaturized. Further, when the hot water temperature of the heat storage tank is lowered due to the hot water discharge, the heat pump operation is performed by the hot water temperature detecting means and the heat pump controlling means, so that efficient operation can be performed. Further, by connecting the branch flow path from the circulation flow path to the outlet side of the heat exchanger via the switching valve, the switching valve and the circulation pump are operated when the combustion burner is stopped when the hot water is stopped, and the lower part of the heat storage tank is operated. Water can be circulated to the heat exchanger through the branch flow path, the residual heat of the heat exchanger can be taken and recovered to the heat storage tank, so that the temperature of the heat exchanger can be prevented from rising abnormally due to the stop of water flow, and the thermal efficiency is improved. To do.
0007
BEST MODE FOR CARRYING OUT THE INVENTION
A water heater that solves the above problems can be realized by the embodiment described in each claim. The invention according to claim 1 of the present invention provides a heat pump, a heat storage tank, and a hot water discharge pipe of the heat storage tank, which are configured by connecting a compressor, a condenser, a decompressor, and an evaporator by a refrigerant flow path. A heat exchanger heated by the heat of the combustion burner, a circulation flow path that is guided from the lower part of the heat storage tank to the condenser via a circulation pump and returned to the heat storage tank, and a switching valve from the circulation flow path. A branch flow path connected to the outlet side of the heat exchanger is provided via the heat exchanger, and water in the lower part of the heat storage tank is circulated to the heat exchanger through the branch flow path by the circulation pump to form the heat exchanger. The residual heat is recovered in the heat storage tank. As a result, the water in the heat storage tank is stored at a predetermined temperature set in advance by the operation of the heat pump. Since the predetermined temperature is an intermediate temperature of 50 to 55 ° C., which is usually higher than the normal hot water temperature, the efficiency of the heat pump is sufficiently ensured, so that the heat dissipation loss of the heat storage tank is reduced. In addition, if the heat exchanger that is heated by the heat of the combustion burner installed in the middle of the hot water discharge pipe of the heat storage tank is provided, the hot water temperature of the heat storage tank drops, or if high temperature hot water is required to be discharged. Since the temperature can be raised by combustion, the heat storage tank can be set to the minimum required size, so that the heat storage tank can be miniaturized. Further, by connecting the branch flow path from the circulation flow path to the outlet side of the heat exchanger via the switching valve, the switching valve and the circulation pump are operated when the combustion burner is stopped when the hot water is stopped, and the lower part of the heat storage tank is operated. Water can be circulated to the heat exchanger through the branch flow path, the residual heat of the heat exchanger can be taken and recovered to the heat storage tank, so that the temperature of the heat exchanger can be prevented from rising abnormally due to the stop of water flow, and the thermal efficiency is improved. To do.
0008
In addition to the invention of claim 1, the invention according to claim 2 includes a flow rate detecting means for detecting the flow of water in the hot water pipe of the tank and a combustion burner for detecting that the flow rate has disappeared by the flow rate detecting means. By providing a control means that switches the switching valve so that it flows from the circulation flow path to the branch flow path at the same time when the combustion is stopped and drives the circulation pump, the hot water stop detection and the operation after the hot water stop are ensured and reliability. Is improved.
0009
In addition to the invention of claim 2, the invention according to claim 3 includes a tank hot water pipe water temperature detecting means for detecting the tank hot water pipe water temperature between the heat storage tank and the heat exchanger, and the tank hot water pipe water temperature. By providing a control means for adjusting the amount of circulating water so that the detected water temperature of the detecting means becomes a predetermined temperature equivalent to the hot water temperature of the heat storage tank, the residual heat of the heat exchanger can be made stable in the heat storage tank. Can be recovered.
0010
Further, in the invention according to claim 4, in addition to the invention according to claim 3, the circulation water amount is adjusted by adjusting the rotation speed of the circulation pump, so that a special valve or the like for adjusting the circulation water amount can be used. No need to add parts.
0011
Further, in the invention according to claim 5, in addition to the invention according to claim 2, the heat exchanger temperature detecting means for detecting the temperature of the heat exchanger and the detection temperature of the heat exchanger temperature detecting means are higher than the predetermined temperature. By providing a control means for stopping the circulation pump when the temperature drops, it is possible to prevent the heat exchanger from being overcooled and to quickly raise the temperature of the hot water at the time of the next hot water discharge.
0012
Further, in the invention according to claim 6, in addition to the invention according to claim 2, the burner temperature detecting means for detecting the temperature of the burner and the circulation pump are stopped when the detection temperature of the burner temperature detecting means falls below a predetermined temperature. By providing a control means for performing the above, it is possible to prevent the burner from being overcooled and to quickly raise the temperature of the hot water at the time of the next hot water discharge.
0013
【Example】
Hereinafter, examples of the present invention will be described with reference to the drawings. In each embodiment, parts having the same configuration and the same operation are designated by the same reference numerals to avoid duplicate explanations.
0014.
(Example 1)
FIG. 1 is a configuration diagram of a water heater according to a first embodiment of the present invention.
0015.
In FIG. 1, the heat pump 11 is configured by connecting a compressor 12, a condenser 13, a decompressor 14, and an evaporator 15 by a refrigerant flow path. Reference numeral 16 denotes a heat storage tank, which has a hot water temperature detecting means 17 for detecting the hot water temperature of the heat storage tank 16. Water from the lower part of the heat storage tank 16 is guided to the condenser 13 by the circulation pump 18, and is heated by the heat of the condenser 13 to be heated and returned to the heat storage tank 16. A pipeline 20 for supplying tap water or the like is provided at the lower part of the heat storage tank 16, and a tank hot water pipe 21 is provided at the upper part. The combustion water heater 23 is provided on the way to the terminal curan 22 of the tank hot water pipe 21. A heat exchanger 25 that is heated by the heat of the combustion burner 24 that constitutes the above is arranged. Reference numeral 26 denotes a branch flow path that connects the circulation flow path 19 and the outlet side of the heat exchange device 25. 27 is a switching valve that selectively switches the flow of the circulation flow path 19 to the heat storage tank 16 or the branch flow path 26.
0016.
In the above configuration, the operation and operation will be described. First, when the power supply (not shown) is turned on, the switching valve 27 sets the flow of the circulation flow path 19 to the heat storage tank 16 side, starts the operation of the heat pump 11 and the circulation pump 18, and enters the heat storage tank 16. Boil water to a predetermined temperature (50-55 ° C.). When the temperature of the hot water in the heat storage tank 16 is 50 to 55 ° C. when the hot water is normally discharged, the combustion burner 24 does not ignite and the temperature of the hot water in the heat storage tank 16 drops, or when high temperature hot water is required to be discharged. The temperature is raised by combustion. Therefore, since the intermediate temperature is 50 to 55 ° C., which is usually higher than the hot water temperature, the heat dissipation loss of the heat storage tank 16 is reduced.
[0017]
Further, since the heat exchanger 25 that is heated by the heat of the combustion burner 24 provided in the middle of the tank hot water pipe 21 between the heat storage tank 16 and the terminal curan 22 that discharges hot water is provided, the hot water temperature of the heat storage tank 16 is lowered. In this case, or when hot water at a high temperature is required, the temperature can be raised by combustion, so that the heat storage tank 16 can be set to the minimum necessary size, so that the heat storage tank 16 can be miniaturized.
0018
Further, by connecting the branch flow path 26 from the circulation flow path 19 to the outlet side of the heat exchanger 25 via the switching valve 27, the switching valve 27 is connected to the circulation flow path 19 when the combustion of the combustion burner 24 is stopped when the hot water is stopped. By switching the flow to the branch flow path 26 and operating the circulation pump 18, the water under the heat storage tank 16 is circulated to the heat exchanger 25 through the branch flow path 26, the residual heat of the heat exchanger 26 is removed, and the heat storage tank It can be collected to 16. In this way, it is possible to prevent an abnormal temperature rise of the heat exchanger 25 due to the suspension of water flow, and the thermal efficiency is improved. In FIG. 1, the switching valve 27 is arranged on the downstream side of the condenser 13, but the same operation and effect can be obtained even if it is arranged on the upstream side of the condenser 13 (between the circulation pump 18 and the condenser 13). It is clear that.
0019
(Example 2)
FIG. 2 is a configuration diagram of a water heater according to a second embodiment of the present invention. In FIG. 2, 28 is a flow rate detecting means for detecting the flow of water in the tank hot water pipe 21, and 29 is a control means for the flow rate detecting unit 30, the flow rate ratio unit 31, the burner operating means 32, the circulation pump operating means 33, and the switching valve switching. It is composed of means 34.
0020
In the above configuration, the operation and operation will be described.
0021.
When the terminal curan 22 is closed at the end of the hot water discharge, the flow of water in the tank hot water pipe 21 disappears. Then, the flow rate detecting unit 30 of the control means 29 reads the signal transmitted from the flow rate detecting means 28, the flow rate comparing unit 31 determines that the flow rate has disappeared, and if the combustion burner 24 is operating at that time, the burner The operation of the combustion burner 24 is stopped by the operating means 32, and at the same time, the switching valve 27 is switched by the switching valve switching means 34 so that the circulation flow rate 19 is connected to the branch flow rate 26, and the circulation pump 18 is switched by the circulation pump operating means 33. To drive.
0022.
By providing the control means 29 that performs the above operation, the hot water stop detection and the operation after the hot water stop are ensured, and the reliability is improved. If the combustion burner 24 is not in operation at the end of hot water discharge, the above operation is not performed. In FIG. 2, the flow rate detecting means 28 is installed between the heat storage tank 16 and the heat exchanger 25, but the same operation and effect can be obtained even if the flow rate detecting means 28 is installed between the heat exchanger 25 and the terminal curan 22. it is obvious.
[0023]
(Example 3)
FIG. 3 is a block diagram of the water heater according to the third embodiment of the present invention. In FIG. 3, the difference from FIG. 2 is that a tank hot water pipe water temperature detecting means 35 for detecting the water temperature of the tank hot water pipe 21 between the heat storage tank 17 and the heat exchanger 25 is provided, and the tank hot water pipe is provided in the control means 29. The point is that it has a water temperature detection unit 36 and a tank hot water pipe water temperature comparison unit 37.
0024
In the above configuration, the operation and operation will be described.
0025
When the terminal curan 22 is closed at the end of the hot water discharge, the flow of water in the tank hot water pipe 21 disappears. Then, the flow rate detecting unit 30 of the control means 29 reads the signal transmitted from the flow rate detecting means 28, the flow rate comparing unit 31 determines that the flow rate has disappeared, and if the combustion burner 24 is operating at that time, the burner The operation of the combustion burner 24 is stopped by the operating means 32, and at the same time, the switching valve 27 is switched by the switching valve switching means 34 so that the circulation flow rate 19 is connected to the branch flow rate 26, and the circulation pump 18 is switched by the circulation pump operating means 33. To drive. At this time, the tank hot water pipe water temperature detecting unit 36 reads the signal transmitted from the tank hot water pipe water temperature detecting means 35, and the tank hot water pipe water temperature comparing unit 37 detects the detected temperature equivalent to the hot water temperature of the heat storage tank 16. The rotation speed of the circulation pump 18 is adjusted by the circulation pump operating means 33 so as to reach a predetermined temperature, and the amount of circulating water is adjusted. The preset predetermined temperature is equal to or equal to the temperature of hot water normally stored in the heat storage tank 16. The temperature is above.
0026
In this way, the tank hot water pipe water temperature detecting means 35 for detecting the water temperature of the tank hot water pipe 21 between the heat storage tank 16 and the heat exchanger 25, and the detected water temperature of the tank hot water pipe water temperature detecting means 35 are the heat storage tank 16. The hot water in which the residual heat of the heat exchanger 25 is stored in the heat storage tank 16 is provided with the control means 29 for adjusting the amount of circulating water so that the temperature becomes equal to or higher than the hot water temperature. It can be recovered as a stable hot water temperature without disturbing the temperature. Further, since the circulating water amount is adjusted by adjusting the rotation speed of the circulation pump 18, it is not necessary to add parts such as a special valve for adjusting the circulating water amount.
[0027]
(Example 4)
FIG. 4 is a block diagram of the water heater according to the fourth embodiment of the present invention. In FIG. 4, the difference from FIG. 3 is that the heat exchanger temperature detecting means 38 for detecting the temperature of the heat exchanger 25 is provided, and the heat exchanger temperature detecting unit 39 and the heat exchanger temperature comparing unit 40 are provided in the control means 29. It is a point having.
[0028]
In the above configuration, the operation and operation will be described. When the switching valve 27 and the circulation pump 18 are operating when the combustion burner 24 stops burning when the hot water is stopped, the heat exchanger temperature detecting unit 39 reads the signal transmitted from the heat exchanger temperature detecting means 38 to exchange heat. When the device temperature comparison unit 40 determines that the detected temperature has dropped below a preset predetermined temperature, a command is sent to the circulation pump operating means 33 to stop the circulation pump. The preset predetermined temperature is set to a temperature of 50 to 90 ° C., preferably 60 to 70 ° C., at which the water inside the heat exchanger 25 does not boil. In this way, the heat exchanger temperature detecting means 35 that detects the temperature of the heat exchanger 25 and the control means 29 that stops the circulation pump 18 when the detection temperature of the heat exchanger temperature detecting means 35 falls below a predetermined temperature. By providing the heat exchanger 25, it is possible to prevent the heat exchanger 25 from being overcooled and to quickly raise the temperature of the hot water at the time of the next hot water discharge.
[0029]
(Example 5)
FIG. 5 is a block diagram of the water heater according to the fifth embodiment of the present invention. In FIG. 5, the difference from FIG. 4 is that the burner temperature detecting means 41 for detecting the temperature of the combustion burner 24 is provided, and the burner temperature detecting unit 42 and the burner temperature comparing unit 43 are provided in the control means 29.
[0030]
In the above configuration, the operation and operation will be described. When the switching valve 27 and the circulation pump 18 are operating when the combustion burner 24 stops burning when the hot water is stopped, the burner temperature detecting unit 42 reads the signal transmitted from the burner temperature detecting means 41, and the burner temperature comparing unit 43 reads the signal transmitted from the burner temperature detecting means 41. When it is determined that the detected temperature has dropped below the preset predetermined temperature, a command is sent to the circulation pump operating means 33 to stop the circulation pump. As described above, the burner temperature detecting means 41 for detecting the temperature of the combustion burner 24 and the control means 29 for stopping the circulation pump 18 when the detected temperature of the burner temperature detecting means 41 falls below a predetermined temperature are provided. As a result, it is possible to prevent the combustion burner 24 from being overcooled, and to speed up the rise of the hot water temperature at the time of the next hot water discharge.
0031
In the present invention, the configuration of a water heater that combines a heat pump and combustion has been described, but the same effect can be obtained by applying it to another combustion water heater configuration having a heat storage tank and a circulation pump.
[0032]
【Effect of the invention】
As is clear from the above description , according to the present invention, the water in the heat storage tank is stored at a preset intermediate temperature by the operation of the heat pump and is stored, so that the efficiency of the heat pump is sufficiently ensured and the heat is stored. The heat dissipation loss of the tank is reduced. In addition, if the heat exchanger that is heated by the heat of the combustion burner installed in the middle of the hot water discharge pipe of the heat storage tank is provided, the hot water temperature of the heat storage tank drops, or if high temperature hot water is required to be discharged. Since the temperature can be raised by combustion, the heat storage tank can be set to the minimum required size, so that the heat storage tank can be miniaturized. Further, by connecting the branch flow path from the circulation flow path to the outlet side of the heat exchanger via the switching valve, the switching valve and the circulation pump are operated when the combustion burner is stopped when the hot water is stopped, and the lower part of the heat storage tank is operated. Water can be circulated to the heat exchanger through the branch flow path, the residual heat of the heat exchanger can be taken and recovered to the heat storage tank. To do.
[Simple explanation of drawings]
FIG. 1
FIG. 2 is a block diagram of a water heater according to a first embodiment of the present invention.
FIG. 3 is a block diagram of a water heater according to a second embodiment of the present invention.
FIG. 4 is a block diagram of a water heater according to a third embodiment of the present invention.
FIG. 5 is a block diagram of a water heater according to a fourth embodiment of the present invention.
FIG. 6 is a block diagram of a water heater according to a fifth embodiment of the present invention.
Configuration diagram of a conventional water heater [Explanation of symbols]
11 Heat pump 12 Compressor 13 Condenser 14 Decompressor 15 Evaporator 16 Heat storage tank 18 Circulation pump 19 Circulation flow path 21 Tank hot water pipe 24 Combustion burner 25 Heat exchanger 26 Branch flow path 27 Switching valve 28 Flow rate detection means 29 Control means 35 Tank outlet pipe Water temperature detecting means 38 Heat exchanger temperature detecting means 41 Burner temperature detecting means

JP21971899A 1999-08-03 1999-08-03 Water heater Expired - Fee Related JP3642233B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP21971899A JP3642233B2 (en) 1999-08-03 1999-08-03 Water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP21971899A JP3642233B2 (en) 1999-08-03 1999-08-03 Water heater

Publications (3)

Publication Number Publication Date
JP2001041573A JP2001041573A (en) 2001-02-16
JP3642233B2 JP3642233B2 (en) 2005-04-27
JP2001041573A5 true JP2001041573A5 (en) 2005-07-21

Family

ID=16739891

Family Applications (1)

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Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2003069236A1 (en) * 2002-02-12 2003-08-21 Matsushita Electric Industrial Co., Ltd. Heat pump water heater
CN1950647B (en) * 2004-03-15 2010-05-05 吉普工业(澳大利亚)集团有限公司 A water heater and a method of operating same
JP5137311B2 (en) * 2006-03-14 2013-02-06 株式会社パロマ Water heater
JP5305714B2 (en) * 2008-04-03 2013-10-02 シャープ株式会社 Hot water heating system
JP5185091B2 (en) * 2008-12-03 2013-04-17 シャープ株式会社 Heat pump hot water supply system
JP5084768B2 (en) 2009-03-11 2012-11-28 リンナイ株式会社 Hot water system
JP5090479B2 (en) * 2010-01-20 2012-12-05 株式会社パロマ Water heater
JP5309061B2 (en) * 2010-03-10 2013-10-09 リンナイ株式会社 Hot water system
CN101900416B (en) * 2010-08-06 2012-07-04 江苏天舒电器有限公司 Constant-temperature variable energy-saving water heater
JP7135910B2 (en) * 2019-02-05 2022-09-13 三菱電機株式会社 Storage hot water heater
CN115111784A (en) * 2022-06-24 2022-09-27 宁波方太厨具有限公司 Temperature control method and device for water heater, water heater and storage medium

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