JP5929585B2 - Hot water storage water heater - Google Patents

Hot water storage water heater Download PDF

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JP5929585B2
JP5929585B2 JP2012162893A JP2012162893A JP5929585B2 JP 5929585 B2 JP5929585 B2 JP 5929585B2 JP 2012162893 A JP2012162893 A JP 2012162893A JP 2012162893 A JP2012162893 A JP 2012162893A JP 5929585 B2 JP5929585 B2 JP 5929585B2
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flow path
hot water
valve body
heat source
water storage
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JP2014020760A (en
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真行 須藤
真行 須藤
利幸 佐久間
利幸 佐久間
尚希 渡邉
尚希 渡邉
康史 本庄
康史 本庄
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Mitsubishi Electric Corp
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Description

本発明は、貯湯式給湯機に関する。   The present invention relates to a hot water storage type water heater.

貯湯タンクの下部から低温水を流出させ、この低温水をヒートポンプ式加熱源等の加熱手段にて沸き上げて貯湯タンクの上部に戻す沸き上げ運転を行うことにより、貯湯タンク内に湯を貯える貯湯式給湯機において、被加熱物（例えば、浴槽から循環する浴槽水）を加熱するための利用側熱交換器を備え、貯湯タンクまたは加熱手段から供給される湯を熱源水として利用側熱交換器に送る運転を行うことにより、浴槽の追焚き（保温または昇温）等を可能とする技術が知られている。   Hot water that stores hot water in the hot water storage tank by performing a boiling operation in which low temperature water flows out from the lower part of the hot water storage tank, and the low temperature water is heated by heating means such as a heat pump heating source and returned to the upper part of the hot water storage tank. Type hot water supply apparatus comprising a use side heat exchanger for heating an object to be heated (for example, bath water circulating from a bathtub), and using a hot water supplied from a hot water storage tank or heating means as a heat source water, a use side heat exchanger There is known a technique that enables a bath to be chased (insulated or heated) by performing an operation to be sent to a tub.

また、特許文献１には、給湯混合弁と、風呂混合弁と、風呂用熱交換器と、風呂用熱交換器と浴槽とを接続する風呂往き管および風呂戻り管と、風呂戻り管に設けた四方弁と、この四方弁の弁体位置を切り替える制御部とを備え、四方弁の第一弁口は風呂混合弁に連通する湯張り管に接続し、第二弁口は風呂戻り管の浴槽側と接続し、第３弁口は風呂往き管と接続し、第４弁口は風呂戻り管の風呂熱交換器側と接続し、給湯中に湯張り指令が発生した時は、四方弁の開度を低速で変化させ、湯張り流量を徐々に変化させることで、湯張りの開始時、停止時に使用中のシャワーや給湯栓から思わぬ高温の湯が放出されるような事態を防止するようにした貯湯式給湯機が開示されている。   Further, in Patent Document 1, a hot water supply mixing valve, a bath mixing valve, a bath heat exchanger, a bath heat exchanger connecting the bath heat exchanger and a bathtub, a bath return pipe, and a bath return pipe are provided. A four-way valve and a controller for switching the valve body position of the four-way valve, the first valve port of the four-way valve is connected to a hot water pipe connected to the bath mixing valve, and the second valve port is a bath return pipe Connected to the bathtub side, the third valve port is connected to the bath outlet pipe, the fourth valve port is connected to the bath heat exchanger side of the bath return pipe, and when a hot water filling command occurs during hot water supply, a four-way valve By changing the opening degree of the hot water at a low speed and gradually changing the filling water flow rate, unexpected hot water can be prevented from being discharged from the shower or hot water tap that is in use when the filling is started or stopped. A hot water storage-type water heater that is configured to be used is disclosed.

特開２００９−９２３０４号公報JP 2009-92304 A

貯湯タンク内に貯留された湯を熱源水として利用側熱交換器に送る運転と、加熱手段により加熱された湯を熱源水として利用側熱交換器に送る運転とを選択可能な貯湯式給湯機において、貯湯タンクの下部から流出させた低温水を加熱手段で加熱して生成した湯を貯湯タンクの上部に戻す沸き上げ運転の実行中に追焚き要求が発生した場合に、加熱手段により加熱された湯の送り先が貯湯タンクの上部から利用側熱交換器に切り替わるように流路を切り替える制御を行うことが考えられる。しかしながら、このような場合に、加熱手段により加熱された湯は、貯湯タンク内に貯留された湯よりも高温であるため、加熱手段により加熱された高温の湯が利用側熱交換器に流入することにより、利用側熱交換器内で浴槽水が過剰に加熱され、浴槽内の入浴者が不快に感じるような温度の湯が利用側熱交換器から浴槽へ供給される可能性がある。   A hot water storage type hot water heater capable of selecting an operation of sending hot water stored in a hot water storage tank to the use side heat exchanger as heat source water and an operation of sending hot water heated by the heating means to the use side heat exchanger as heat source water In this case, when a reheating request is generated during the boiling operation for returning the hot water generated by heating the low temperature water flowing out from the lower part of the hot water storage tank to the upper part of the hot water storage tank, it is heated by the heating means. It is conceivable to perform control to switch the flow path so that the hot water destination is switched from the upper part of the hot water storage tank to the use side heat exchanger. However, in such a case, the hot water heated by the heating means is at a higher temperature than the hot water stored in the hot water storage tank, so the hot water heated by the heating means flows into the use side heat exchanger. Accordingly, the bath water is heated excessively in the use side heat exchanger, and there is a possibility that hot water having a temperature that makes the bather in the bathtub feel uncomfortable is supplied from the use side heat exchanger to the bathtub.

本発明は、上述のような課題を解決するためになされたもので、利用側熱交換器における被加熱物の過剰な加熱を確実に防止可能な貯湯式給湯機を提供することを目的とする。   The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a hot water storage type water heater that can reliably prevent excessive heating of an object to be heated in a use side heat exchanger. .

本発明に係る貯湯式給湯機は、湯水を貯留する貯湯タンクと、水を加熱して湯を生成可能な加熱手段と、湯水を循環させる循環ポンプと、被加熱物と熱源水とを熱交換させることにより被加熱物を加熱する利用側熱交換器と、貯湯タンクの下部領域から取り出した水を加熱手段に送り、加熱手段で加熱されて生成した湯を貯湯タンクに送って貯湯タンクの上部領域に流入させる沸き上げ水循環流路と、加熱手段で加熱されて生成した湯を熱源水として利用側熱交換器に送り、利用側熱交換器を通過した熱源水を加熱手段に送って再循環させる熱源水循環流路とを形成可能な流路系と、弁体を有し、弁体の変位により、沸き上げ水循環流路を形成させる第一流路形態と、熱源水循環流路を形成させる第二流路形態とに切り替え可能な流路切替手段と、沸き上げ水循環流路に循環ポンプにより湯水を循環させる沸き上げ運転の実行中に、流路切替手段を第一流路形態から第二流路形態に切り替えて、熱源水循環流路に循環ポンプにより熱源水を循環させて被加熱物を加熱する熱源水循環運転に移行する場合に、沸き上げ運転の非実行時に流路切替手段を第一流路形態から第二流路形態に切り替える場合に比べて、弁体が第一流路形態の位置から第二流路形態の位置に変位するまでの時間が長くなるように流路切替手段の動作を制御するスロー切替制御を行う制御手段と、利用側熱交換器による加熱後の被加熱物の温度を検知する温度検知手段と、を備え、制御手段は、スロー切替制御において、弁体が第一流路形態の位置と第二流路形態の位置との間の複数の段階で一時停止するように弁体を断続的に変位させ、制御手段は、スロー切替制御において、加熱後の被加熱物の温度が目標温度以下に安定している場合には弁体を一段階進め、加熱後の被加熱物の温度が目標温度以下に安定しない場合には、加熱後の被加熱物の温度が目標温度以下に安定するまで、または所定の待機時間が経過するまで、弁体を一時停止させ、制御手段は、スロー切替制御の実行中に、温度検知手段により検知された加熱後の被加熱物の温度に基づいて加熱手段により供給される熱量が不足しているか否かを判断し、加熱手段により供給される熱量が不足していると判断した場合には、スロー切替制御を中止して弁体を通常の速さで第二流路形態の位置まで変位させるものである。
また、本発明に係る貯湯式給湯機は、湯水を貯留する貯湯タンクと、水を加熱して湯を生成可能な加熱手段と、湯水を循環させる循環ポンプと、被加熱物と熱源水とを熱交換させることにより被加熱物を加熱する利用側熱交換器と、貯湯タンクの下部領域から取り出した水を加熱手段に送り、加熱手段で加熱されて生成した湯を貯湯タンクに送って貯湯タンクの上部領域に流入させる沸き上げ水循環流路と、加熱手段で加熱されて生成した湯を熱源水として利用側熱交換器に送り、利用側熱交換器を通過した熱源水を加熱手段に送って再循環させる熱源水循環流路とを形成可能な流路系と、弁体を有し、弁体の変位により、沸き上げ水循環流路を形成させる第一流路形態と、熱源水循環流路を形成させる第二流路形態とに切り替え可能な流路切替手段と、沸き上げ水循環流路に循環ポンプにより湯水を循環させる沸き上げ運転の実行中に、流路切替手段を第一流路形態から第二流路形態に切り替えて、熱源水循環流路に循環ポンプにより熱源水を循環させて被加熱物を加熱する熱源水循環運転に移行する場合に、沸き上げ運転の非実行時に流路切替手段を第一流路形態から第二流路形態に切り替える場合に比べて、弁体が第一流路形態の位置から第二流路形態の位置に変位するまでの時間が長くなるように流路切替手段の動作を制御するスロー切替制御を行う制御手段と、を備え、制御手段は、スロー切替制御において、弁体が第一流路形態の位置と第二流路形態の位置との間の複数の段階で一時停止するように弁体を断続的に変位させ、制御手段は、スロー切替制御において、弁体の一段階当たりの変位量を変化させるものである。
また、本発明に係る貯湯式給湯機は、湯水を貯留する貯湯タンクと、水を加熱して湯を生成可能な加熱手段と、湯水を循環させる循環ポンプと、被加熱物と熱源水とを熱交換させることにより被加熱物を加熱する利用側熱交換器と、貯湯タンクの下部領域から取り出した水を加熱手段に送り、加熱手段で加熱されて生成した湯を貯湯タンクに送って貯湯タンクの上部領域に流入させる沸き上げ水循環流路と、加熱手段で加熱されて生成した湯を熱源水として利用側熱交換器に送り、利用側熱交換器を通過した熱源水を加熱手段に送って再循環させる熱源水循環流路とを形成可能な流路系と、弁体を有し、弁体の変位により、沸き上げ水循環流路を形成させる第一流路形態と、熱源水循環流路を形成させる第二流路形態とに切り替え可能な流路切替手段と、沸き上げ水循環流路に循環ポンプにより湯水を循環させる沸き上げ運転の実行中に、流路切替手段を第一流路形態から第二流路形態に切り替えて、熱源水循環流路に循環ポンプにより熱源水を循環させて被加熱物を加熱する熱源水循環運転に移行する場合に、沸き上げ運転の非実行時に流路切替手段を第一流路形態から第二流路形態に切り替える場合に比べて、弁体が第一流路形態の位置から第二流路形態の位置に変位するまでの時間が長くなるように流路切替手段の動作を制御するスロー切替制御を行う制御手段と、を備え、制御手段は、スロー切替制御において、弁体が第一流路形態の位置と第二流路形態の位置との間の複数の段階で一時停止するように弁体を断続的に変位させ、制御手段は、スロー切替制御において、弁体が第一流路形態の位置から第二流路形態の位置に変位するまでの間を第一領域、第二領域および第三領域の順に分け、第二領域における弁体の一段階当たりの変位量を第一領域における弁体の一段階当たりの変位量より小さくし、第三領域における弁体の一段階当たりの変位量を第二領域における弁体の一段階当たりの変位量より大きくするものである。
The hot water storage type hot water heater according to the present invention performs heat exchange between a hot water storage tank for storing hot water, heating means capable of generating hot water by heating water, a circulation pump for circulating hot water, and an object to be heated and heat source water. The heat exchanger that heats the object to be heated and the water extracted from the lower area of the hot water storage tank are sent to the heating means, and the hot water generated by the heating means is sent to the hot water storage tank to the upper part of the hot water storage tank. Boiled water circulation flow path that flows into the area, hot water generated by heating means is sent to the use side heat exchanger as heat source water, and heat source water that has passed through the use side heat exchanger is sent to the heating means for recirculation A heat source water circulation flow path that can form a heat source water circulation flow path, a first flow path configuration that has a valve body and that forms a boiling water circulation flow path by displacement of the valve body, and a second heat source water circulation flow path that forms a heat source water circulation flow path Channel switching hand that can switch to channel configuration And during the boiling operation in which hot water is circulated through the boiling water circulation channel by the circulation pump, the channel switching means is switched from the first channel configuration to the second channel configuration, and the heat source water circulation channel is connected to the heat source water circulation channel by the circulation pump. When shifting to heat source water circulation operation that circulates heat source water and heats the object to be heated, compared to the case where the flow path switching means is switched from the first flow path form to the second flow path form when the boiling operation is not performed, Control means for performing slow switching control for controlling the operation of the flow path switching means so that the time until the valve body is displaced from the position of the first flow path form to the position of the second flow path form, and use side heat exchange Temperature detecting means for detecting the temperature of the object to be heated after being heated by the vessel, and the control means, in the slow switching control, between the position of the first flow path form and the position of the second flow path form in the valve body To pause at multiple stages of The body is intermittently displaced, and in the slow switching control, the control means advances the valve body one step when the temperature of the heated object after heating is stable below the target temperature, and the heated object after heating If the temperature of is not stable below the target temperature, the valve body is temporarily stopped until the temperature of the heated object is stabilized below the target temperature or until a predetermined waiting time elapses. Then, during the execution of the slow switching control, it is determined whether the amount of heat supplied by the heating means is insufficient based on the temperature of the heated object detected by the temperature detection means, and is supplied by the heating means. If it is determined that the amount of heat generated is insufficient, the slow switching control is stopped and the valve body is displaced to the position of the second flow path form at a normal speed .
The hot water storage type hot water heater according to the present invention includes a hot water storage tank for storing hot water, heating means capable of heating the water to generate hot water, a circulation pump for circulating hot water, an object to be heated, and heat source water. Use side heat exchanger that heats the object to be heated by heat exchange and water taken out from the lower area of the hot water storage tank to the heating means, and hot water generated by the heating means is sent to the hot water storage tank Boiled water circulation flow path that flows into the upper region of the water, and hot water generated by heating means is sent to the use side heat exchanger as heat source water, and the heat source water that has passed through the use side heat exchanger is sent to the heating means. A flow path system capable of forming a heat source water circulation flow path for recirculation, a first flow path configuration having a valve body and forming a boiling water circulation flow path by displacement of the valve body, and a heat source water circulation flow path are formed. Channel that can be switched to the second channel configuration During the execution of the replacement means and the boiling operation in which hot water is circulated through the boiling water circulation flow path by the circulation pump, the flow path switching means is switched from the first flow path form to the second flow path form and circulated to the heat source water circulation flow path. Compared to switching the flow path switching means from the first flow path configuration to the second flow path configuration when the boiling operation is not performed when shifting to the heat source water circulation operation in which the heat source water is circulated by the pump to heat the object to be heated. Control means for performing slow switching control for controlling the operation of the flow path switching means so that the time until the valve body is displaced from the position of the first flow path form to the position of the second flow path form is increased. In the slow switching control, the control means intermittently displaces the valve body so that the valve body temporarily stops at a plurality of stages between the position of the first flow path configuration and the position of the second flow path configuration. In the slow switching control, the means is a valve It is intended to vary the displacement amount per one step of.
The hot water storage type hot water heater according to the present invention includes a hot water storage tank for storing hot water, heating means capable of heating the water to generate hot water, a circulation pump for circulating hot water, an object to be heated, and heat source water. Use side heat exchanger that heats the object to be heated by heat exchange and water taken out from the lower area of the hot water storage tank to the heating means, and hot water generated by the heating means is sent to the hot water storage tank Boiled water circulation flow path that flows into the upper region of the water, and hot water generated by heating means is sent to the use side heat exchanger as heat source water, and the heat source water that has passed through the use side heat exchanger is sent to the heating means. A flow path system capable of forming a heat source water circulation flow path for recirculation, a first flow path configuration having a valve body and forming a boiling water circulation flow path by displacement of the valve body, and a heat source water circulation flow path are formed. Channel that can be switched to the second channel configuration During the execution of the replacement means and the boiling operation in which hot water is circulated through the boiling water circulation flow path by the circulation pump, the flow path switching means is switched from the first flow path form to the second flow path form and circulated to the heat source water circulation flow path. Compared to switching the flow path switching means from the first flow path configuration to the second flow path configuration when the boiling operation is not performed when shifting to the heat source water circulation operation in which the heat source water is circulated by the pump to heat the object to be heated. Control means for performing slow switching control for controlling the operation of the flow path switching means so that the time until the valve body is displaced from the position of the first flow path form to the position of the second flow path form is increased. In the slow switching control, the control means intermittently displaces the valve body so that the valve body temporarily stops at a plurality of stages between the position of the first flow path configuration and the position of the second flow path configuration. In the slow switching control, the means is a valve The first region, the second region, and the third region are divided in order from the position of the first flow path form to the position of the second flow path form, and the displacement amount per stage of the valve body in the second area Is smaller than the displacement per stage of the valve body in the first area, and the displacement per stage of the valve body in the third area is larger than the displacement per stage of the valve body in the second area. is there.

本発明によれば、利用側熱交換器における被加熱物の過剰な加熱を確実に防止することが可能となる。   ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to prevent reliably the excessive heating of the to-be-heated material in a utilization side heat exchanger.

本発明の実施の形態１の貯湯式給湯機を示す構成図である。It is a block diagram which shows the hot water storage type water heater of Embodiment 1 of this invention. 本発明の実施の形態１における貯湯式給湯機の沸き上げ運転時の回路構成図である。It is a circuit block diagram at the time of the boiling operation of the hot water storage type water heater in Embodiment 1 of this invention. 本発明の実施の形態１における貯湯式給湯機のタンク戻し追い焚き運転（熱源水タンク戻し運転）時の回路構成図である。It is a circuit block diagram at the time of the tank return chase operation (heat source water tank return operation) of the hot water storage type hot water heater in Embodiment 1 of the present invention. 本発明の実施の形態１における貯湯式給湯機のヒートポンプ追い焚き運転（熱源水循環運転）時の回路構成図である。It is a circuit block diagram at the time of the heat pump reheating operation (heat source water circulation operation) of the hot water storage type hot water heater in Embodiment 1 of the present invention. 本発明の実施の形態１における貯湯式給湯機が備える三方弁（流路切替手段）の斜視図である。It is a perspective view of the three-way valve (flow-path switching means) with which the hot water storage type hot water heater in Embodiment 1 of this invention is provided. 図５中の平面Ａでの三方弁（弁体位置０°）の断面図である。It is sectional drawing of the three-way valve (valve body position 0 degree) in the plane A in FIG. 図５中の平面Ａでの三方弁（弁体位置１８０°）の断面図である。It is sectional drawing of the three-way valve (valve body position 180 degrees) in the plane A in FIG. 図５中の平面Ａでの三方弁（弁体位置９０°）の断面図である。It is sectional drawing of the three-way valve (valve body position 90 degrees) in the plane A in FIG. 三方弁の弁体位置と、ａポートおよびｂポートの各々の循環流量との関係を示す循環流量特性図である。It is a circulating flow characteristic figure which shows the relationship between the valve body position of a three-way valve, and each circulating flow of a port and b port. 本発明の実施の形態１の貯湯式給湯機において三方弁を弁体位置０°から弁体位置１８０°へ通常の切り替え制御を行う場合の弁体位置変化特性を示す図である。It is a figure which shows the valve body position change characteristic at the time of performing normal switching control of the three-way valve from valve body position 0 degree to valve body position 180 degrees in the hot water storage type water heater of Embodiment 1 of this invention. 本発明の実施の形態１の貯湯式給湯機において三方弁を弁体位置０°から弁体位置１８０°へスロー切替制御を行う場合の弁体位置変化特性を示す図である。It is a figure which shows the valve body position change characteristic at the time of performing slow switching control from the valve body position 0 degree to the valve body position 180 degrees in the hot water storage type water heater of Embodiment 1 of this invention. 本発明の実施の形態２の貯湯式給湯機において三方弁を弁体位置０°から弁体位置１８０°へスロー切替制御を行う場合の弁体位置変化特性を示す図である。It is a figure which shows the valve body position change characteristic at the time of performing slow switching control from the valve body position 0 degree to the valve body position 180 degrees in the hot water storage type water heater of Embodiment 2 of this invention. 本発明の実施の形態３の貯湯式給湯機において三方弁を弁体位置０°から弁体位置１８０°へスロー切替制御を行う場合の弁体位置変化特性を示す図である。It is a figure which shows the valve body position change characteristic at the time of performing slow switching control from the valve body position 0 degree to the valve body position 180 degrees in the hot water storage type hot water heater of Embodiment 3 of this invention.

以下、図面を参照して本発明の実施の形態について説明する。なお、各図において共通する要素には、同一の符号を付して、重複する説明を省略する。   Embodiments of the present invention will be described below with reference to the drawings. In addition, the same code | symbol is attached | subjected to the element which is common in each figure, and the overlapping description is abbreviate | omitted.

実施の形態１．
図１は、本発明の実施の形態１の貯湯式給湯機を示す構成図である。 Embodiment 1 FIG.
FIG. 1 is a configuration diagram illustrating a hot water storage type water heater according to Embodiment 1 of the present invention.

図１は、本発明の実施の形態１における貯湯式給湯機１００の構成図である。図１に示す貯湯式給湯機１００は、貯湯タンクユニット１と、ヒートポンプサイクルを利用するように構成されたヒートポンプユニット６０とを備えている。貯湯タンクユニット１と、ヒートポンプユニット６０とは、ヒートポンプ入口配管４１とヒートポンプ出口配管４２と図示しない電気配線とを介して接続されている。また、貯湯タンクユニット１には、制御部７０（制御手段）が内蔵されている。貯湯タンクユニット１およびヒートポンプユニット６０が備える各種の弁類、ポンプ類等の作動は、これらと電気的に接続された制御部７０により制御される。制御部７０は、例えば浴室や台所に設置されるリモコン装置等のユーザーインターフェース装置と相互に通信可能に接続される。以下、貯湯式給湯機１００の各構成要素について説明する。   FIG. 1 is a configuration diagram of a hot water storage type water heater 100 according to Embodiment 1 of the present invention. A hot water storage type water heater 100 shown in FIG. 1 includes a hot water storage tank unit 1 and a heat pump unit 60 configured to use a heat pump cycle. The hot water storage tank unit 1 and the heat pump unit 60 are connected to each other through a heat pump inlet pipe 41, a heat pump outlet pipe 42, and an electric wiring (not shown). Further, the hot water storage tank unit 1 includes a control unit 70 (control means). Operations of various valves, pumps and the like provided in the hot water storage tank unit 1 and the heat pump unit 60 are controlled by a control unit 70 electrically connected thereto. The control unit 70 is connected to a user interface device such as a remote control device installed in a bathroom or kitchen so as to communicate with each other. Hereinafter, each component of the hot water storage type water heater 100 will be described.

ヒートポンプユニット６０は、貯湯タンクユニット１から導かれた水を加熱する（沸き上げる）ための加熱手段として機能するものである。ヒートポンプユニット６０は、圧縮機６１、沸き上げ用熱交換器６２、膨張弁６３、空気熱交換器６４を冷媒循環配管６５にて環状に接続した冷凍サイクル（ヒートポンプサイクル）を搭載している。沸き上げ用熱交換器６２は、冷媒循環配管６５を流れる冷媒と貯湯タンクユニット１から導かれた水との間で熱交換を行うためのものである。また、ＨＰ出口側温度センサ６６は、沸き上げ用熱交換器６２で加熱された湯（高温水）の温度を検知するセンサであり、ヒートポンプ出口配管４２に設けられている。ヒートポンプユニット６０で高温水を得るためには、ヒートポンプサイクルは、冷媒として二酸化炭素を用い、臨界圧を越える圧力で運転することが好ましい。   The heat pump unit 60 functions as a heating means for heating (boiling) the water guided from the hot water storage tank unit 1. The heat pump unit 60 is equipped with a refrigeration cycle (heat pump cycle) in which a compressor 61, a heating heat exchanger 62, an expansion valve 63, and an air heat exchanger 64 are annularly connected by a refrigerant circulation pipe 65. The boiling heat exchanger 62 is for exchanging heat between the refrigerant flowing through the refrigerant circulation pipe 65 and the water guided from the hot water storage tank unit 1. The HP outlet side temperature sensor 66 is a sensor that detects the temperature of hot water (hot water) heated by the boiling heat exchanger 62, and is provided in the heat pump outlet pipe 42. In order to obtain high-temperature water by the heat pump unit 60, it is preferable that the heat pump cycle is operated at a pressure exceeding the critical pressure using carbon dioxide as a refrigerant.

一方、貯湯タンクユニット１には、以下の各種部品や流路系を形成するための配管などが内蔵されている。貯湯タンク１０は、湯水を貯留するためのものである。貯湯タンク１０の下部に設けられた給水口１４には、水道等の外部の水源からの水を供給するための給水配管２が接続されている。貯湯タンク１０の上部領域（中間より上側の領域）に設けられた上部口１５には、タンク上部配管４３の一端が接続されている。タンク上部配管４３の途中から分岐した給湯配管３と、給水配管２から分岐した給水配管４とは、給湯混合弁３３にそれぞれ接続されている。給湯混合弁３３は、貯湯タンク１０の上部口１５から取り出されて給湯配管３を通って供給される高温の湯と、給水配管４から供給される低温水とを混合し、ユーザーが設定した給湯温度となるようにその混合比を調整する。給湯混合弁３３で混合された湯は、混合給湯配管５を経由して、例えば蛇口、シャワー等の外部給湯栓（図示せず）または浴槽５０へ供給される。なお、図示の構成と異なり、給湯配管３の上流端がタンク上部配管４３とは別個に貯湯タンク１０の上部に接続されていてもよい。   On the other hand, the hot water storage tank unit 1 incorporates the following various parts and piping for forming a flow path system. The hot water storage tank 10 is for storing hot water. A water supply pipe 2 for supplying water from an external water source such as a water supply is connected to a water supply port 14 provided in the lower part of the hot water storage tank 10. One end of a tank upper pipe 43 is connected to the upper port 15 provided in the upper region (region above the middle) of the hot water storage tank 10. The hot water supply pipe 3 branched from the middle of the tank upper pipe 43 and the water supply pipe 4 branched from the water supply pipe 2 are connected to the hot water supply mixing valve 33, respectively. The hot water mixing valve 33 mixes hot hot water taken out from the upper port 15 of the hot water storage tank 10 and supplied through the hot water supply pipe 3 with low temperature water supplied from the hot water supply pipe 4 to set the hot water supply set by the user. The mixing ratio is adjusted so that the temperature is reached. Hot water mixed by the hot water mixing valve 33 is supplied to an external hot water tap (not shown) such as a faucet or a shower or the bathtub 50 via the mixed hot water supply pipe 5. Unlike the illustrated configuration, the upstream end of the hot water supply pipe 3 may be connected to the upper part of the hot water storage tank 10 separately from the tank upper pipe 43.

ヒートポンプユニット６０を用いて加熱されて生成された湯（高温水）が上部口１５から貯湯タンク１０内に流入し、給水配管２からの低温水が給水口１４から貯湯タンク１０内に流入することにより、貯湯タンク１０内には、上層側が高温で下層側が低温となるように温度成層が形成されて湯水を貯留可能になっている。貯湯タンク１０の表面には、貯湯タンク１０内の湯水の温度分布を検出するため、複数の貯湯温度センサ１１，１２がそれぞれ異なる高さ位置に取り付けられている。制御部７０は、それらの貯湯温度センサ１１，１２により取得された貯湯タンク１０内の高さ方向の温度分布に基づいて、貯湯タンク１０内の貯湯量（蓄熱量）を算出することができ、その貯湯量に基づいて、後述する沸き上げ運転の開始および停止などが制御される。   Hot water (hot water) generated by heating using the heat pump unit 60 flows into the hot water storage tank 10 from the upper port 15, and low temperature water from the water supply pipe 2 flows into the hot water storage tank 10 from the water supply port 14. Thus, in the hot water storage tank 10, temperature stratification is formed so that the upper layer side is at a high temperature and the lower layer side is at a low temperature, so that hot water can be stored. In order to detect the temperature distribution of the hot water in the hot water storage tank 10, a plurality of hot water storage temperature sensors 11 and 12 are attached to the surface of the hot water storage tank 10 at different height positions. The controller 70 can calculate the amount of stored hot water (heat storage amount) in the hot water storage tank 10 based on the temperature distribution in the height direction in the hot water storage tank 10 acquired by the hot water storage temperature sensors 11 and 12. Based on the amount of stored hot water, the start and stop of the heating operation, which will be described later, is controlled.

また、貯湯タンクユニット１内には、循環ポンプ２１および利用側熱交換器２２が内蔵されている。循環ポンプ２１は、各種配管に湯水を循環させるためのポンプである。利用側熱交換器２２は、貯湯タンク１０あるいはヒートポンプユニット６０から供給される湯を熱源水とし、この熱源水と熱交換することにより被加熱物を加熱するための熱交換器である。浴槽水循環回路５１は、浴槽５０から導出した湯水（浴槽水）を、利用側熱交換器２２を経由させて、浴槽５０に戻すように配設されている。浴槽水循環回路５１の途中には、浴槽水を循環させるための二次側循環ポンプ５２と、浴槽５０から出た浴槽水の温度を検知する浴槽出口側温度センサ５３と、利用側熱交換器２２から出て浴槽５０に戻る浴槽水の温度を検知する浴槽入口側温度センサ５５（温度検知手段）とが設置されている。このように、本実施形態では、利用側熱交換器２２の二次側の構成として、浴槽５０内の浴槽水を循環させる浴槽水循環回路５１を備え、利用側熱交換器２２にて浴槽水を加熱するものを例に説明するが、本発明における利用側熱交換器は、浴槽水以外の被加熱物（例えば、暖房用循環水など）を加熱するものであってもよい。   The hot water storage tank unit 1 includes a circulation pump 21 and a use side heat exchanger 22. The circulation pump 21 is a pump for circulating hot water through various pipes. The use side heat exchanger 22 is a heat exchanger for heating an object to be heated by using hot water supplied from the hot water storage tank 10 or the heat pump unit 60 as heat source water and exchanging heat with the heat source water. The bathtub water circulation circuit 51 is arranged so that hot water (tub water) derived from the bathtub 50 is returned to the bathtub 50 via the use-side heat exchanger 22. In the middle of the bathtub water circulation circuit 51, a secondary-side circulation pump 52 for circulating the bathtub water, a bathtub outlet-side temperature sensor 53 that detects the temperature of the bathtub water that has come out of the bathtub 50, and the use-side heat exchanger 22. A bathtub inlet side temperature sensor 55 (temperature detection means) for detecting the temperature of the bathtub water coming out of the tank and returning to the bathtub 50 is installed. As described above, in the present embodiment, as the secondary side configuration of the use side heat exchanger 22, the bathtub water circulation circuit 51 that circulates the bathtub water in the bathtub 50 is provided, and the bathtub water is supplied from the use side heat exchanger 22. Although what is heated is demonstrated to an example, the utilization side heat exchanger in this invention may heat to-be-heated objects other than bathtub water (for example, circulating water for heating, etc.).

次に、貯湯タンクユニット１が備える弁類および配管類について説明する。貯湯タンクユニット１は、三方弁３１（流路切替手段、第一流路切替弁）と、四方弁３２（第二流路切替弁）とを有している。三方弁３１は、湯水が流入する２つの入口（ａポート、ｂポート）と、湯水が流出する１つの出口（ｃポート）とを有し、ａポートもしくはｂポートのどちらかから湯水が流入するように湯水の経路を切り替え可能（すなわち、ａ−ｃ経路、ｂ−ｃ経路の何れかに切り替え可能）に構成されている。四方弁３２は、湯水が流入する２つの入口（ｂポート、ｃポート）と、湯水が流出する２つの出口（ａポート、ｄポート）とを有し、３つの経路、すなわち、ｂ−ａ経路、ｃ−ａ経路、ｃ−ｄ経路の間で流路形態を切り替え可能に構成されている。   Next, the valves and piping included in the hot water storage tank unit 1 will be described. The hot water storage tank unit 1 has a three-way valve 31 (flow path switching means, first flow path switching valve) and a four-way valve 32 (second flow path switching valve). The three-way valve 31 has two inlets (a port and b port) through which hot water flows in and one outlet (c port) through which hot water flows out, and hot water flows from either the a port or the b port. Thus, the hot water path can be switched (that is, it can be switched to either the ac path or the bc path). The four-way valve 32 has two inlets (b port and c port) through which hot water flows and two outlets (a port and d port) through which hot water flows out, and has three paths, that is, a ba path. , C-a route, and cd route, the flow path form is configured to be switchable.

また、貯湯タンクユニット１は、タンク下部配管４０、タンク戻し配管４４（熱源水戻し流路）、利用側熱交換器一次側入口配管４５、利用側熱交換器一次側出口配管４６およびバイパス配管４７（バイパス流路）を更に備えている。   The hot water storage tank unit 1 includes a tank lower pipe 40, a tank return pipe 44 (heat source water return flow path), a use side heat exchanger primary side inlet pipe 45, a use side heat exchanger primary side outlet pipe 46, and a bypass pipe 47. (Bypass channel) is further provided.

タンク下部配管４０は、貯湯タンク１０の下部領域（中間より下側の領域）に設けられた下部口１６と、三方弁３１のａポートとを接続する流路である。ヒートポンプ入口配管４１は、三方弁３１のｃポートと、ヒートポンプユニット６０の入水口（すなわち沸き上げ用熱交換器６２の入水口）とを接続する流路である。循環ポンプ２１は、ヒートポンプ入口配管４１の途中に設けられている。ヒートポンプ出口配管４２は、ヒートポンプユニット６０の出湯口（すなわち沸き上げ用熱交換器６２の出湯口）と、四方弁３２のｃポートとを接続する流路である。タンク上部配管４３は、四方弁３２のｄポートと、貯湯タンク１０の上部口１５とを接続する流路である。タンク戻し配管４４は、四方弁３２のａポートと、貯湯タンク１０の好ましくは中間部から下部の間に設けられた戻し口１７（熱源水戻し口）とを接続する流路である。利用側熱交換器一次側入口配管４５は、タンク上部配管４３の途中から分岐し、利用側熱交換器２２の一次側入口に接続される流路である。利用側熱交換器一次側出口配管４６は、利用側熱交換器２２の一次側出口と、三方弁３１のｂポートとを接続する流路である。バイパス配管４７は、ヒートポンプ入口配管４１における循環ポンプ２１の吐出口とヒートポンプユニット６０の入水口との間から分岐し、四方弁３２のｂポートに接続される流路である。   The tank lower pipe 40 is a flow path that connects the lower port 16 provided in the lower region (region below the middle) of the hot water storage tank 10 and the a port of the three-way valve 31. The heat pump inlet pipe 41 is a flow path that connects the c port of the three-way valve 31 and the water inlet of the heat pump unit 60 (that is, the water inlet of the heating heat exchanger 62). The circulation pump 21 is provided in the middle of the heat pump inlet pipe 41. The heat pump outlet pipe 42 is a flow path that connects the outlet of the heat pump unit 60 (that is, the outlet of the heat exchanger 62 for boiling) and the c port of the four-way valve 32. The tank upper pipe 43 is a flow path that connects the d port of the four-way valve 32 and the upper port 15 of the hot water storage tank 10. The tank return pipe 44 is a flow path connecting the a port of the four-way valve 32 and the return port 17 (heat source water return port) provided between the hot water storage tank 10 and preferably the middle part to the lower part. The use side heat exchanger primary side inlet pipe 45 is a flow path that branches from the middle of the tank upper pipe 43 and is connected to the primary side inlet of the use side heat exchanger 22. The use side heat exchanger primary side outlet pipe 46 is a flow path that connects the primary side outlet of the use side heat exchanger 22 and the b port of the three-way valve 31. The bypass pipe 47 is a flow path that branches from between the outlet of the circulation pump 21 and the water inlet of the heat pump unit 60 in the heat pump inlet pipe 41 and is connected to the b port of the four-way valve 32.

本実施形態の貯湯式給湯機１００では、以下の図２乃至４に示す運転状態に応じて三方弁３１を制御して、次の第一および第二の２つの流路形態の間で、貯湯タンクユニット１内の湯水の流路を切り替えて使用するようになっている。より具体的には、三方弁３１により選択可能な「第一流路形態」とは、貯湯タンク１０の下部口１６とヒートポンプユニット６０の入水口とがタンク下部配管４０、循環ポンプ２１およびヒートポンプ入口配管４１を介して連通し、利用側熱交換器一次側出口配管４６を遮断する流路形態（すなわちａ−ｃ経路）である。三方弁３１により選択可能な「第二流路形態」とは、利用側熱交換器一次側出口配管４６とヒートポンプユニット６０の入水口とが、循環ポンプ２１およびヒートポンプ入口配管４１を介して連通し、貯湯タンク１０の下部口１６とヒートポンプユニット６０の入水口との間を遮断する流路形態（すなわちｂ−ｃ経路）である。   In the hot water storage type water heater 100 according to the present embodiment, the three-way valve 31 is controlled according to the operation state shown in FIGS. 2 to 4 below, and hot water storage is performed between the following first and second flow path configurations. The hot water flow path in the tank unit 1 is switched and used. More specifically, the “first flow path configuration” that can be selected by the three-way valve 31 is that the lower port 16 of the hot water storage tank 10 and the water inlet of the heat pump unit 60 are the tank lower pipe 40, the circulation pump 21, and the heat pump inlet pipe. 41 is a flow path form (that is, an ac path) that communicates via the line 41 and blocks the use side heat exchanger primary side outlet pipe 46. The “second flow path configuration” that can be selected by the three-way valve 31 is that the use side heat exchanger primary side outlet pipe 46 and the water inlet of the heat pump unit 60 communicate with each other via the circulation pump 21 and the heat pump inlet pipe 41. This is a flow path configuration (that is, a bc path) that blocks between the lower port 16 of the hot water storage tank 10 and the water inlet of the heat pump unit 60.

また、本実施形態の貯湯式給湯機１００では、以下の図２乃至図４に示す運転状態に応じて四方弁３２を制御して、次の第一および第二の２つの流路形態の間で、流路を切り替えられるようになっている。より具体的には、四方弁３２により選択可能な「第一流路形態」とは、ヒートポンプユニット６０の出湯口と貯湯タンク１０の上部口１５とがヒートポンプ出口配管４２およびタンク上部配管４３を介して連通し、バイパス配管４７およびタンク戻し配管４４を遮断する流路形態（すなわちｃ−ｄ経路）である。四方弁３２により選択可能な「第二流路形態」とは、バイパス配管４７とタンク戻し配管４４とが連通し、ヒートポンプユニット６０の出湯口と貯湯タンク１０の上部口１５との間を遮断する流路形態（すなわちｂ−ａ経路）である。   Further, in the hot water storage type hot water heater 100 of the present embodiment, the four-way valve 32 is controlled according to the operation state shown in FIGS. 2 to 4 below, and between the following first and second flow path configurations. Thus, the flow path can be switched. More specifically, the “first flow path configuration” that can be selected by the four-way valve 32 is that the outlet port of the heat pump unit 60 and the upper port 15 of the hot water storage tank 10 are connected via the heat pump outlet pipe 42 and the tank upper pipe 43. This is a flow path form (that is, a cd path) that communicates and blocks the bypass pipe 47 and the tank return pipe 44. The “second flow path configuration” that can be selected by the four-way valve 32 means that the bypass pipe 47 and the tank return pipe 44 communicate with each other, and shuts off between the outlet port of the heat pump unit 60 and the upper port 15 of the hot water storage tank 10. It is a flow path form (namely, ba route).

図２は、本発明の実施の形態１における貯湯式給湯機１００の沸き上げ運転時の回路構成図である。沸き上げ運転（貯湯運転）とは、ヒートポンプユニット６０を利用して貯湯タンク１０内の水を沸き上げて湯とすることにより貯湯タンク１０内の貯湯量（蓄熱量）を増加させる運転である。この沸き上げ運転時には、三方弁３１は、ａポートとｃポートとが連通し、ｂポートが閉状態となるように（すなわち、三方弁３１の上記第一流路形態が選択されるように）制御される。これにより、タンク下部配管４０とヒートポンプ入口配管４１とが連通するとともに、利用側熱交換器一次側出口配管４６側を閉として利用側熱交換器２２からの流路が遮断される。また、沸き上げ運転時には、四方弁３２は、ｃポートとｄポートとが連通し、ａポートとｂポートとが閉状態となるように（すなわち、四方弁３２の上記第一流路形態が選択されるように）制御される。これにより、ヒートポンプ出口配管４２とタンク上部配管４３とが連通するとともに、タンク戻し配管４４側を閉として貯湯タンク１０の戻し口１７への流路が遮断される。   FIG. 2 is a circuit configuration diagram of the hot water storage water heater 100 according to Embodiment 1 of the present invention during a boiling operation. The boiling operation (hot water storage operation) is an operation for increasing the amount of stored hot water (heat storage amount) in the hot water storage tank 10 by using the heat pump unit 60 to boil the water in the hot water storage tank 10 into hot water. During the heating operation, the three-way valve 31 is controlled so that the a port and the c port communicate with each other and the b port is closed (that is, the first flow path configuration of the three-way valve 31 is selected). Is done. As a result, the tank lower pipe 40 and the heat pump inlet pipe 41 communicate with each other, and the use side heat exchanger primary side outlet pipe 46 side is closed and the flow path from the use side heat exchanger 22 is blocked. Further, during the boiling operation, the four-way valve 32 is selected such that the c port and the d port communicate with each other and the a port and the b port are closed (that is, the first flow path configuration of the four-way valve 32 is selected). Controlled). As a result, the heat pump outlet pipe 42 and the tank upper pipe 43 communicate with each other, and the flow path to the return port 17 of the hot water storage tank 10 is blocked by closing the tank return pipe 44 side.

沸き上げ運転は、上記のように三方弁３１および四方弁３２が制御されることによって沸き上げ水循環流路が形成された状態で、循環ポンプ２１およびヒートポンプユニット６０を稼動させることにより実行される。その結果、貯湯タンク１０の下部口１６から流出する低温水は、タンク下部配管４０、三方弁３１、循環ポンプ２１およびヒートポンプ入口配管４１を経由してヒートポンプユニット６０に導かれ、沸き上げ用熱交換器６２において加熱された後、高温水となってヒートポンプ出口配管４２、四方弁３２およびタンク上部配管４３を経由して、貯湯タンク１０の上部口１５から貯湯タンク１０内に流入し貯えられる。このような沸き上げ運転が実行されることで、貯湯タンク１０の内部では、上層部から高温水が貯えられていき、この高温水層が徐々に厚くなる。   The boiling operation is executed by operating the circulation pump 21 and the heat pump unit 60 in a state where the boiling water circulation passage is formed by controlling the three-way valve 31 and the four-way valve 32 as described above. As a result, the low-temperature water flowing out from the lower port 16 of the hot water storage tank 10 is led to the heat pump unit 60 via the tank lower pipe 40, the three-way valve 31, the circulation pump 21 and the heat pump inlet pipe 41, and heat exchange for boiling is performed. After being heated in the vessel 62, the hot water flows into the hot water storage tank 10 from the upper port 15 of the hot water storage tank 10 through the heat pump outlet pipe 42, the four-way valve 32 and the tank upper pipe 43. By performing such boiling operation, high temperature water is stored from the upper layer inside the hot water storage tank 10, and this high temperature water layer gradually becomes thicker.

図３は、本発明の実施の形態１における貯湯式給湯機１００のタンク戻し追い焚き運転時の回路構成図である。タンク戻し追い焚き運転（熱源水タンク戻し運転）とは、二次側循環ポンプ５２を稼動させて浴槽５０内の浴槽水を浴槽水循環回路５１により利用側熱交換器２２の二次側に導くとともに、貯湯タンク１０の内部に貯えられた湯（高温水）を熱源水として利用側熱交換器２２の一次側に導くことで双方を熱交換させ、利用側熱交換器２２で加熱された浴槽水を浴槽５０内に戻すことにより、浴槽５０の温度をユーザーが設定した浴槽目標温度に保温または昇温する運転である。このタンク戻し追い焚き運転時には、四方弁３２は、ａポートとｂポートが連通し、ｃポートとｄポートが閉状態となるように（すなわち、四方弁３２の第二流路形態が選択されるように）制御される。また、三方弁３１は、ｂポートとｃポートが連通し、ａポートが閉状態となるように（すなわち、三方弁３１の第二の流路形態が選択されるように）制御される。これにより、バイパス配管４７とタンク戻し配管４４とが連通し、ヒートポンプ出口配管４２およびタンク上部配管４３が遮断されるとともに、利用側熱交換器一次側出口配管４６とヒートポンプ入口配管４１とが連通し、タンク下部配管４０が遮断される。タンク戻し追い焚き運転は、上記のように三方弁３１および四方弁３２が制御された状態で、循環ポンプ２１を稼動させることにより実行される。これにより、貯湯タンク１０の上部口１５から取り出された湯が熱源水としてタンク上部配管４３および利用側熱交換器一次側入口配管４５を通って利用側熱交換器２２に供給される。そして、利用側熱交換器２２で浴槽水に熱を与えて温度低下した熱源水は、利用側熱交換器一次側出口配管４６、三方弁３１、循環ポンプ２１、ヒートポンプ入口配管４１、バイパス配管４７、四方弁３２およびタンク戻し配管４４の順に通過し、戻し口１７から貯湯タンク１０内に流入する。   FIG. 3 is a circuit configuration diagram of the hot water storage type water heater 100 according to Embodiment 1 of the present invention during the tank return chase operation. In the tank return chasing operation (heat source water tank return operation), the secondary side circulation pump 52 is operated to guide the bathtub water in the bathtub 50 to the secondary side of the use side heat exchanger 22 by the bathtub water circulation circuit 51. The hot water (high temperature water) stored in the hot water storage tank 10 is led to the primary side of the use side heat exchanger 22 as heat source water to exchange heat between them, and the bath water heated by the use side heat exchanger 22 Is returned to the bathtub 50 to keep the temperature of the bathtub 50 at the target bath temperature set by the user. During this tank return chasing operation, the four-way valve 32 is selected so that the a port and the b port communicate with each other and the c port and the d port are closed (that is, the second flow path configuration of the four-way valve 32 is selected. Controlled). The three-way valve 31 is controlled such that the b port and the c port communicate with each other and the a port is closed (that is, the second flow path configuration of the three-way valve 31 is selected). Thereby, the bypass pipe 47 and the tank return pipe 44 communicate with each other, the heat pump outlet pipe 42 and the tank upper pipe 43 are shut off, and the use side heat exchanger primary side outlet pipe 46 and the heat pump inlet pipe 41 communicate with each other. The tank lower pipe 40 is shut off. The tank return chasing operation is executed by operating the circulation pump 21 with the three-way valve 31 and the four-way valve 32 controlled as described above. Thereby, the hot water taken out from the upper port 15 of the hot water storage tank 10 is supplied as heat source water to the usage side heat exchanger 22 through the tank upper side piping 43 and the usage side heat exchanger primary side inlet piping 45. And the heat source water which gave the heat to the bath water in the use side heat exchanger 22 and the temperature decreased is the use side heat exchanger primary side outlet pipe 46, the three-way valve 31, the circulation pump 21, the heat pump inlet pipe 41, and the bypass pipe 47. The four-way valve 32 and the tank return pipe 44 pass in this order, and flow into the hot water storage tank 10 from the return port 17.

タンク戻し追い焚き運転の実行中、制御部７０は、浴槽水循環回路５１において利用側熱交換器２２の手前に設置してある浴槽出口側温度センサ５３により浴槽５０内の浴槽水の温度を常に監視するとともに、浴槽入口側温度センサ５５により検知される追い焚き湯温（利用側熱交換器２２で加熱されて浴槽５０へ送られる浴槽水の温度）に基づいて追い焚き加熱能力を制御する追い焚き湯温補正制御を行う。この追い焚き湯温補正制御では、制御部７０は、浴槽入口側温度センサ５５により検知される追い焚き湯温が、目標温度（例えば、ユーザーが設定した浴槽目標温度＋５℃）となるように、循環ポンプ２１の出力（例えば回転数）を制御する。すなわち、制御部７０は、追い焚き湯温が目標温度未満である場合には循環ポンプ２１の出力を増加させることにより追い焚き加熱能力を増加させ、追い焚き湯温が目標温度を超えている場合には循環ポンプ２１の出力を減少させることにより追い焚き加熱能力を減少させる。このような追い焚き湯温補正制御を行うことにより、利用側熱交換器２２から浴槽５０内に流入する湯水の温度を適温に制御することができ、タンク戻し追い焚き運転の実行中も浴槽５０内の入浴者が快適に入浴することができる。また、制御部７０は、浴槽出口側温度センサ５３で検知した浴槽５０内の浴槽水の温度がユーザーにより設定された浴槽目標温度に到達した場合には、タンク戻し追い焚き運転を停止する。   During execution of the tank return chasing operation, the control unit 70 constantly monitors the temperature of the bathtub water in the bathtub 50 by the bathtub outlet side temperature sensor 53 installed in front of the use side heat exchanger 22 in the bathtub water circulation circuit 51. At the same time, the reheating heat capacity is controlled based on the reheating water temperature detected by the bathtub inlet side temperature sensor 55 (the temperature of the bath water heated by the use-side heat exchanger 22 and sent to the bathtub 50). Perform hot water temperature correction control. In this reheating hot water temperature correction control, the control unit 70 causes the reheating water temperature detected by the bathtub inlet side temperature sensor 55 to be a target temperature (for example, a bath target temperature set by the user + 5 ° C.). The output (for example, rotation speed) of the circulation pump 21 is controlled. That is, when the reheating water temperature is lower than the target temperature, the control unit 70 increases the reheating heat capacity by increasing the output of the circulation pump 21, and the reheating water temperature exceeds the target temperature. In order to reduce the output of the circulation pump 21, the reheating heating capacity is reduced. By performing such reheating hot water temperature correction control, the temperature of hot water flowing into the bathtub 50 from the use-side heat exchanger 22 can be controlled to an appropriate temperature, and the bathtub 50 can be operated even during the tank return reheating operation. The bathers inside can take a bath comfortably. Moreover, the control part 70 stops a tank return chase operation, when the temperature of the bathtub water in the bathtub 50 detected with the bathtub exit side temperature sensor 53 reaches the bathtub target temperature set by the user.

図４は、本発明の実施の形態１における貯湯式給湯機１００のヒートポンプ追い焚き運転時の回路構成図である。ヒートポンプ追い焚き運転（熱源水循環運転）とは、二次側循環ポンプ５２を稼動させて浴槽５０内の浴槽水を浴槽水循環回路５１により利用側熱交換器２２の二次側に導くとともに、ヒートポンプユニット６０を稼動させて沸き上げた湯（高温水）を熱源水として利用側熱交換器２２の一次側に導くことで双方を熱交換させ、利用側熱交換器２２で加熱された浴槽水を浴槽５０内に戻すことにより、浴槽５０の温度をユーザーが設定した浴槽目標温度に保温または昇温する運転である。このヒートポンプ追い焚き運転時には、四方弁３２は、ｃポートとｄポートが連通し、ａポートとｂポートが閉状態となるように（すなわち、四方弁３２の第一流路形態が選択されるように）制御される。また、三方弁３１は、ｂポートとｃポートが連通し、ａポートが閉状態となるように（すなわち、三方弁３１の第二の流路形態が選択されるように）制御される。これにより、ヒートポンプ出口配管４２と利用側熱交換器一次側入口配管４５、利用側熱交換器一次側出口配管４６、ヒートポンプ入口配管４１が連通し、タンク戻し配管４４側を閉として貯湯タンク１０の戻し口１７への流路が遮断される。   FIG. 4 is a circuit configuration diagram of the hot water storage hot water heater 100 according to Embodiment 1 of the present invention during a heat pump reheating operation. In the heat pump reheating operation (heat source water circulation operation), the secondary side circulation pump 52 is operated to guide the bathtub water in the bathtub 50 to the secondary side of the use side heat exchanger 22 by the bathtub water circulation circuit 51, and the heat pump unit. The hot water (high-temperature water) boiled by operating 60 is led to the primary side of the use side heat exchanger 22 as heat source water to exchange heat of both sides, and the bathtub water heated by the use side heat exchanger 22 is used as a bathtub. By returning to 50, the temperature of the bathtub 50 is kept at or raised to the bathtub target temperature set by the user. During this heat pump chasing operation, the four-way valve 32 is configured such that the c port and the d port communicate with each other and the a port and the b port are closed (that is, the first flow path configuration of the four-way valve 32 is selected. Controlled). The three-way valve 31 is controlled such that the b port and the c port communicate with each other and the a port is closed (that is, the second flow path configuration of the three-way valve 31 is selected). Thereby, the heat pump outlet pipe 42 and the use side heat exchanger primary side inlet pipe 45, the use side heat exchanger primary side outlet pipe 46, and the heat pump inlet pipe 41 communicate with each other, and the tank return pipe 44 side is closed and the hot water storage tank 10 is closed. The flow path to the return port 17 is blocked.

ヒートポンプ追い焚き運転は、上記のように三方弁３１および四方弁３２が制御されることによって熱源水循環流路が形成された状態で、循環ポンプ２１およびヒートポンプユニット６０を稼動させることにより実行される。これにより、ヒートポンプユニット６０の沸き上げ用熱交換器６２において加熱された高温の湯が熱源水としてヒートポンプ出口配管４２、四方弁３２、タンク上部配管４３および利用側熱交換器一次側入口配管４５を順次経由して利用側熱交換器２２に供給される。そして、利用側熱交換器２２で浴槽水に熱を与えて温度低下した熱源水は、利用側熱交換器一次側出口配管４６、三方弁３１、循環ポンプ２１およびヒートポンプ入口配管４１を順次経由してヒートポンプユニット６０の沸き上げ用熱交換器６２に送られ、再加熱されて再循環する。   The heat pump chasing operation is executed by operating the circulation pump 21 and the heat pump unit 60 in a state where the heat source water circulation passage is formed by controlling the three-way valve 31 and the four-way valve 32 as described above. Accordingly, the hot water heated in the heating heat exchanger 62 of the heat pump unit 60 is used as the heat source water for the heat pump outlet pipe 42, the four-way valve 32, the tank upper pipe 43, and the use side heat exchanger primary side inlet pipe 45. It is sequentially supplied to the use side heat exchanger 22. Then, the heat source water whose temperature is lowered by applying heat to the bath water in the use side heat exchanger 22 sequentially passes through the use side heat exchanger primary side outlet pipe 46, the three-way valve 31, the circulation pump 21 and the heat pump inlet pipe 41. Is sent to the boiling heat exchanger 62 of the heat pump unit 60, reheated and recirculated.

ヒートポンプ追い焚き運転の実行中、制御部７０は、浴槽出口側温度センサ５３により浴槽５０内の浴槽水の温度を常に監視するとともに、タンク戻し追い焚き運転の実行時と同様にして追い焚き湯温補正制御を行う。また、制御部７０は、浴槽出口側温度センサ５３で検知した浴槽５０内の浴槽水がユーザーにより設定された浴槽目標温度に到達した場合には、ヒートポンプ追い焚き運転を停止する。   During the execution of the heat pump reheating operation, the control unit 70 constantly monitors the temperature of the bath water in the bathtub 50 by the bathtub outlet side temperature sensor 53 and also performs the reheating water temperature in the same manner as in the tank return reheating operation. Perform correction control. Moreover, when the bathtub water in the bathtub 50 detected by the bathtub outlet side temperature sensor 53 reaches the bathtub target temperature set by the user, the control unit 70 stops the heat pump reheating operation.

追い焚き運転の実施要求が発生した場合には、制御部７０は、貯湯式給湯機１００の状態等の条件に基づき、上述したタンク戻し追い焚き運転とヒートポンプ追い焚き運転との何れか一方を所定の規則に従って選択して実行する。ここで、「追い焚き運転の実施要求が発生した場合」とは、例えば、浴槽５０の温度をユーザーにより設定された浴槽目標温度に保温する保温モードの実施中に、浴槽出口側温度センサ５３にて計測される浴槽５０の温度と浴槽目標温度との差が所定値より大きくなって追い焚き運転を自動的に開始する場合や、あるいは、ユーザーがリモコン装置に追い焚き運転の実施指令を入力し、その実施指令の信号をリモコン装置から制御部７０が受信した場合などである。   When a request for performing the reheating operation is generated, the control unit 70 determines one of the tank return reheating operation and the heat pump reheating operation described above based on conditions such as the state of the hot water storage hot water heater 100. Select and execute according to the rules. Here, “when the implementation request for the chasing operation is generated” means, for example, that the temperature at the bathtub outlet side temperature sensor 53 is kept during the heat retention mode in which the temperature of the bathtub 50 is kept at the bath target temperature set by the user. When the difference between the temperature of the bathtub 50 measured and the bathtub target temperature becomes larger than a predetermined value and the reheating operation is automatically started, or the user inputs an operation instruction for the reheating operation to the remote control device. The control unit 70 receives the execution command signal from the remote control device.

次に、三方弁３１について図５乃至図８に基づいて詳細に説明する。図５は、三方弁３１の斜視図である。図６乃至図８は、それぞれ、図５中の平面Ａでの断面図である。図５に示すように、三方弁３１は、ａポート３１ａ、ｂポート３１ｂおよびｃポート３１ｃが設けられた弁枠３１ｅと、弁枠３１ｅの上部に設けられたステッピングモータ３１ｆとを有している。図６乃至図８に示すように、弁枠３１ｅの内部には、略円柱形状または略球形状の弁体３１ｈが設けられている。弁体３１ｈは、回転軸３１ｇを介してステッピングモータ３１ｆに接続されている。弁体３１ｈの内部には、Ｔ字状の連通部３１ｉが形成されている。このような三方弁３１は、ステッピングモータ３１ｆの駆動により、回転軸３１ｇを中心として弁体３１ｈが回転して、流路形態の切り替えを行う構成となっている。なお、図６乃至図８では、弁体３１ｈの周囲に設置されるシール部材の図示を省略しているため、弁体３１ｈと弁枠３１ｅの内壁との間に隙間が生じているが、実際にはこの隙間は図示しないシール部材により封止される。   Next, the three-way valve 31 will be described in detail with reference to FIGS. FIG. 5 is a perspective view of the three-way valve 31. 6 to 8 are cross-sectional views taken along a plane A in FIG. As shown in FIG. 5, the three-way valve 31 has a valve frame 31e provided with an a port 31a, a b port 31b and a c port 31c, and a stepping motor 31f provided on the upper part of the valve frame 31e. . As shown in FIGS. 6 to 8, a substantially cylindrical or substantially spherical valve element 31h is provided inside the valve frame 31e. The valve body 31h is connected to the stepping motor 31f via the rotating shaft 31g. A T-shaped communication portion 31i is formed inside the valve body 31h. Such a three-way valve 31 is configured such that the valve body 31h rotates around the rotation shaft 31g and the flow path configuration is switched by driving the stepping motor 31f. 6 to 8, since the illustration of the seal member installed around the valve body 31h is omitted, there is a gap between the valve body 31h and the inner wall of the valve frame 31e. The gap is sealed with a seal member (not shown).

図６は、ａポート３１ａとｃポート３１ｃとが連通し、ｂポート３１ｂが閉となる第一流路形態の状態を表している。このときの弁体３１ｈの位置（以下、「弁体位置」と称する）を０°とする。沸き上げ運転時には、三方弁３１は、図６に示す弁体位置０°の状態となる。また、本実施形態の貯湯式給湯機１００では、上述した沸き上げ運転、タンク戻し追い焚き運転、ヒートポンプ追い焚き運転等の循環ポンプ２１を稼動する運転を実行していない待機状態においては、三方弁３１を弁体位置０°の状態で待機させる。   FIG. 6 shows a state of the first flow path configuration in which the a port 31a and the c port 31c communicate with each other and the b port 31b is closed. The position of the valve body 31h at this time (hereinafter referred to as “valve body position”) is set to 0 °. During the heating operation, the three-way valve 31 is in the state of the valve body position 0 ° shown in FIG. Further, in the hot water storage type water heater 100 of the present embodiment, the three-way valve is in a standby state in which the operation for operating the circulation pump 21 such as the above-described boiling operation, tank return reheating operation, heat pump reheating operation and the like is not performed. 31 is made to stand by in the state of valve body position 0 degree.

図７は、ｂポート３１ｂとｃポート３１ｃとが連通し、ａポートが閉となる第二流路形態の状態を表している。このときの弁体位置は、図６に示す位置から１８０°回転しているので、１８０°となる。ヒートポンプ追い焚き運転時、あるいはタンク戻し追い焚き運転時には、三方弁３１は、図７に示す弁体位置１８０°の状態となる。   FIG. 7 shows a state of the second flow path configuration in which the b port 31b and the c port 31c communicate with each other and the a port is closed. The valve body position at this time is 180 ° because it is rotated 180 ° from the position shown in FIG. At the time of the heat pump chasing operation or the tank return chasing operation, the three-way valve 31 is in the state of the valve body position 180 ° shown in FIG.

図８は、三方弁３１が図６の弁体位置０°（すなわち第一流路形態の位置）から図７の弁体位置１８０°（すなわち第二流路形態の位置）へ切り替わる途中の、弁体位置９０°の状態を表している。この状態では、ａポート３１ａとｂポート３１ｂとｃポート３１ｃとが連通する。   FIG. 8 shows the valve in the middle of switching of the three-way valve 31 from the valve body position 0 ° in FIG. 6 (that is, the position in the first flow path form) to the valve body position 180 ° in FIG. This represents a state where the body position is 90 °. In this state, the a port 31a, the b port 31b, and the c port 31c communicate.

図９は、三方弁３１の弁体位置と、ａポート３１ａおよびｂポート３１ｂの各々の循環流量との関係を示す循環流量特性図である。図９に示されるように、この三方弁３１では、例えば図６に示す弁体位置０°から図７に示す弁体位置１８０°へ切り替える過程において、ａポート３１ａの循環流量は、図９（Ａ）に示すように、弁体３１ｈの変位に伴って減少する傾向となり、最終的に弁体位置１８０°までに閉塞状態となる。逆に、ｂポート３１ｂの循環流量は、図９（Ｂ）に示すように、弁体３１ｈの変位に伴って増加する傾向となり、最終的に弁体位置１８０°で最大流量に達する。   FIG. 9 is a circulation flow characteristic diagram showing the relationship between the valve body position of the three-way valve 31 and the circulation flow rates of the a port 31a and the b port 31b. As shown in FIG. 9, in this three-way valve 31, for example, in the process of switching from the valve body position 0 ° shown in FIG. 6 to the valve body position 180 ° shown in FIG. As shown in A), it tends to decrease with the displacement of the valve body 31h, and finally the valve body position is closed by 180 °. Conversely, as shown in FIG. 9B, the circulation flow rate of the b port 31b tends to increase with the displacement of the valve body 31h, and finally reaches the maximum flow rate at the valve body position 180 °.

図１０は、三方弁３１を弁体位置０°から弁体位置１８０°へ通常の切り替え制御を行う場合の弁体位置変化特性を示す図である。図１０に示すように、本実施形態では、制御部７０が三方弁３１を弁体位置０°から弁体位置１８０°へ通常の切り替え制御を行う場合には、弁体３１ｈは１０秒で弁体位置０°から弁体位置１８０°まで変位する。ここで、制御部７０が三方弁３１を弁体位置０°から弁体位置１８０°へ通常の切り替え制御を行う場合とは、例えば、待機状態にて追い焚き運転の実施要求が発生したときにタンク戻し追い焚き運転を開始するために三方弁３１を弁体位置０°から弁体位置１８０°へ切り替える場合、あるいは待機状態にて追い焚き運転の実施要求が発生したときにヒートポンプ追い焚き運転を開始するために三方弁３１を弁体位置０°から弁体位置１８０°へ切り替える場合などである。なお、本実施形態では、図１０に示すように、三方弁３１を弁体位置０°から弁体位置１８０°へ通常の切り替え制御を行う場合、弁体３１ｈは一定速度で連続的に変位（回転）する。   FIG. 10 is a diagram showing valve body position change characteristics when the normal switching control of the three-way valve 31 from the valve body position 0 ° to the valve body position 180 ° is performed. As shown in FIG. 10, in this embodiment, when the control unit 70 performs normal switching control of the three-way valve 31 from the valve body position 0 ° to the valve body position 180 °, the valve body 31h Displacement from body position 0 ° to valve body position 180 °. Here, the case where the control unit 70 performs the normal switching control of the three-way valve 31 from the valve body position 0 ° to the valve body position 180 ° is, for example, when a request for performing a follow-up operation is generated in a standby state. When the three-way valve 31 is switched from the valve body position 0 ° to the valve body position 180 ° in order to start the tank return chasing operation, or when a request for performing chasing operation is generated in the standby state, the heat pump chasing operation is performed. In order to start, the three-way valve 31 is switched from the valve body position 0 ° to the valve body position 180 °. In this embodiment, as shown in FIG. 10, when normal switching control is performed on the three-way valve 31 from the valve body position 0 ° to the valve body position 180 °, the valve body 31h is continuously displaced at a constant speed ( Rotate.

図１１は、三方弁３１を弁体位置０°から弁体位置１８０°へスロー切替制御を行う場合の弁体位置変化特性を示す図である。図１１に示すように、本実施形態では、制御部７０が三方弁３１を弁体位置０°から弁体位置１８０°へスロー切替制御（スローステップ制御）を行う場合には、図１０に示す通常の切り替え制御の場合に比べて、弁体３１ｈが弁体位置０°から弁体位置１８０°に変位するまでの時間が長くなる（本実施形態では、通常の切り替え制御と比べて４倍の４０秒）ように三方弁３１のステッピングモータ３１ｆの動作を制御する。また、図１１に示すように、本実施形態では、三方弁３１を弁体位置０°から弁体位置１８０°へスロー切替制御を行う場合、弁体３１ｈを一定速度で連続的に変位（回転）させている。   FIG. 11 is a diagram showing a valve body position change characteristic when the three-way valve 31 is subjected to slow switching control from the valve body position 0 ° to the valve body position 180 °. As shown in FIG. 11, in the present embodiment, when the control unit 70 performs the slow switching control (slow step control) from the valve body position 0 ° to the valve body position 180 °, the control unit 70 is shown in FIG. Compared to the normal switching control, the time until the valve body 31h is displaced from the valve body position 0 ° to the valve body position 180 ° becomes longer (in this embodiment, four times as long as the normal switching control). 40 seconds), the operation of the stepping motor 31f of the three-way valve 31 is controlled. Further, as shown in FIG. 11, in this embodiment, when the three-way valve 31 is subjected to slow switching control from the valve body position 0 ° to the valve body position 180 °, the valve body 31h is continuously displaced (rotated) at a constant speed. )

制御部７０は、沸き上げ運転の実行中に追い焚き運転の実施要求が発生し、三方弁３１を弁体位置０°から弁体位置１８０°へ切り替えることによって沸き上げ運転からヒートポンプ追い焚き運転に移行する場合には、上述したスロー切替制御により三方弁３１を弁体位置０°から弁体位置１８０°へ切り替える。これにより、三方弁３１の通常の切り替え制御を行う場合と比較して、三方弁３１のｂポート３１ｂの循環流量の極端な流量変動を抑制可能となる。   The control unit 70 generates a request for performing the reheating operation during the boiling operation, and switches from the boiling operation to the heat pump reheating operation by switching the three-way valve 31 from the valve body position 0 ° to the valve body position 180 °. When shifting, the three-way valve 31 is switched from the valve body position 0 ° to the valve body position 180 ° by the slow switching control described above. Thereby, compared with the case where normal switching control of the three-way valve 31 is performed, it is possible to suppress an extreme flow rate fluctuation of the circulation flow rate of the b port 31b of the three-way valve 31.

ヒートポンプユニット６０で沸き上げられた湯は、貯湯タンク１０に貯えられた湯よりも高温であるため、沸き上げ運転からヒートポンプ追い焚き運転に移行した際に、仮に、三方弁３１のｂポート３１ｂの循環流量が急激に上昇し、ヒートポンプユニット６０で沸き上げられた高温の湯が一気に利用側熱交換器２２に流入したとすると、利用側熱交換器２２内の浴槽水が過剰に加熱される。このような場合には、前述した追い焚き湯温補正制御による補正が追従できないので、浴槽５０内の入浴者が不快に感じるような温度の湯が利用側熱交換器２２から浴槽５０へ流入する可能性がある。   The hot water boiled by the heat pump unit 60 is hotter than the hot water stored in the hot water storage tank 10, and therefore when the transition from the boiling operation to the heat pump reheating operation is performed, the b port 31 b of the three-way valve 31 is temporarily installed. If the circulating flow rate rises rapidly and hot water boiled by the heat pump unit 60 flows into the use side heat exchanger 22 at once, the bath water in the use side heat exchanger 22 is excessively heated. In such a case, since the correction by the reheating water temperature correction control described above cannot follow, hot water having a temperature that makes the bather 50 feel uncomfortable flows from the use side heat exchanger 22 into the bathtub 50. there is a possibility.

これに対し、本実施形態によれば、沸き上げ運転からヒートポンプ追い焚き運転に移行する際に、上述したスロー切替制御により三方弁３１を弁体位置０°から弁体位置１８０°へ切り替えることにより、三方弁３１のｂポート３１ｂの循環流量を緩やかに上昇させ、ヒートポンプユニット６０で沸き上げられた高温の湯が利用側熱交換器２２に流れる流量を徐々に上昇させることができる。このため、利用側熱交換器２２内の浴槽水が過剰に加熱されることを確実に抑制することができ、前述した追い焚き湯温補正制御による補正が十分に追従できるため、浴槽５０内の入浴者が不快に感じるような温度の湯が利用側熱交換器２２から浴槽５０へ流入することを確実に抑制することができる。   On the other hand, according to the present embodiment, when shifting from the heating operation to the heat pump reheating operation, the three-way valve 31 is switched from the valve body position 0 ° to the valve body position 180 ° by the slow switching control described above. The flow rate of the b port 31b of the three-way valve 31 can be gradually increased, and the flow rate of the hot water boiled by the heat pump unit 60 flowing to the use side heat exchanger 22 can be gradually increased. For this reason, it can suppress reliably that the bathtub water in the utilization side heat exchanger 22 is heated excessively, and since correction | amendment by the reheating hot water temperature correction control mentioned above can fully track, It is possible to reliably suppress hot water having a temperature that makes the bather feel uncomfortable from flowing into the bathtub 50 from the use side heat exchanger 22.

上述した実施の形態では、スロー切替制御において弁体３１ｈが弁体位置０°から弁体位置１８０°に変位するまでの時間を所定値（４０秒）としたが、この時間をユーザーが設定した浴槽目標温度に基づいて調整しても良い。例えば、ユーザーが設定した浴槽目標温度が４２℃の場合にはスロー切替制御において弁体３１ｈが弁体位置０°から弁体位置１８０°に変位するまでの時間を６０秒とし、ユーザーが設定した浴槽目標温度が３８℃の場合にはスロー切替制御において弁体３１ｈが弁体位置０°から弁体位置１８０°に変位するまでの時間を４０秒とする。これにより、浴槽目標温度が高い場合であっても、浴槽５０内の入浴者が不快に感じるような温度の湯が利用側熱交換器２２から浴槽５０へ流入することをより確実に抑制することができる。   In the embodiment described above, the time until the valve body 31h is displaced from the valve body position 0 ° to the valve body position 180 ° in the slow switching control is set to a predetermined value (40 seconds), but this time is set by the user. You may adjust based on bathtub target temperature. For example, when the target bath temperature set by the user is 42 ° C., the time until the valve body 31h is displaced from the valve body position 0 ° to the valve body position 180 ° in the slow switching control is set to 60 seconds. When the bath target temperature is 38 ° C., the time until the valve body 31h is displaced from the valve body position 0 ° to the valve body position 180 ° in the slow switching control is 40 seconds. Thereby, even if it is a case where bathtub target temperature is high, it suppresses more reliably that the hot water of the temperature which the bather in the bathtub 50 feels unpleasant flows into the bathtub 50 from the use side heat exchanger 22. Can do.

なお、沸き上げ運転の実行中に追い焚き運転の実施要求が発生し、三方弁３１および四方弁３２の流路形態を切り替えることによって沸き上げ運転からタンク戻し追い焚き運転に移行する場合には、スロー切替制御を行わなくても良い。貯湯タンク１０に貯えられた湯は、ヒートポンプユニット６０で沸き上げられた湯より低温であるので、三方弁３１のｂポート３１ｂの循環流量が急激に上昇したとしても、利用側熱交換器２２内の浴槽水が過剰に加熱される可能性は低いからである。   In addition, when the execution request of the reheating operation is generated during the execution of the boiling operation and the flow mode of the three-way valve 31 and the four-way valve 32 is switched to shift from the boiling operation to the tank return reheating operation, Slow switching control may not be performed. Since the hot water stored in the hot water storage tank 10 is lower in temperature than the hot water boiled by the heat pump unit 60, even if the circulation flow rate of the b port 31 b of the three-way valve 31 increases rapidly, This is because it is unlikely that the bathtub water will be heated excessively.

また、本実施形態の貯湯式給湯機１００では、沸き上げ運転、タンク戻し追い焚き運転、ヒートポンプ追い焚き運転の何れの運転においても、共通の循環ポンプ２１を用いて湯水を循環させることができるので、必要なポンプの数が少なく、製造コストの低減、装置の重量軽減および小型化を図ることができる。   In the hot water storage type hot water heater 100 of the present embodiment, hot water can be circulated using the common circulation pump 21 in any of the heating operation, the tank return reheating operation, and the heat pump reheating operation. The number of necessary pumps is small, and the manufacturing cost can be reduced, the weight of the device can be reduced, and the size can be reduced.

また、本発明における流路切替手段は、上述した三方弁３１のように弁体を回転させることによって流路形態を切り替える構造のものに限定されるものではなく、例えば弁体を直線的に変位させることによって流路形態を切り替える構造のものでも良い。   Further, the flow path switching means in the present invention is not limited to a structure that switches the flow path form by rotating the valve body as in the above-described three-way valve 31, and for example, the valve body is linearly displaced. The thing of the structure which switches a flow-path form by making it may be sufficient.

実施の形態２．
次に、図１２を参照して、本発明の実施の形態２について説明するが、上述した実施の形態１との相違点を中心に説明し、同一部分または相当部分は同一符号を付し説明を省略する。本実施の形態２の貯湯式給湯機１００のハードウェア構成は、実施の形態１と同様であるので、説明を省略する。 Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIG. 12. The description will focus on the differences from the first embodiment described above, and the same or corresponding parts will be denoted by the same reference numerals. Is omitted. Since the hardware configuration of the hot water storage type hot water heater 100 of the second embodiment is the same as that of the first embodiment, the description thereof is omitted.

図１２は、本実施の形態２の貯湯式給湯機１００において三方弁３１を弁体位置０°から弁体位置１８０°へスロー切替制御を行う場合の弁体位置変化特性を示す図である。図１２に示すように、本実施の形態２におけるスロー切替制御では、三方弁３１の弁体３１ｈが弁体位置０°と弁体位置１８０°との間の複数の段階で一時停止するように弁体３１ｈを断続的に変位（回転）させる。図１２に示す例では、弁体３１ｈを所定角度（例えば３６°）または所定時間（例えば５秒間）回転させた後に弁体３１ｈを所定時間（例えば５秒間）一時停止させることを繰り返し、弁体位置０°から弁体位置１８０°まで４５秒間で弁体３１ｈを変位させている。このような本実施の形態２のスロー切替制御の方法によっても、実施の形態１と同様の効果が得られる。   FIG. 12 is a diagram showing valve body position change characteristics when the three-way valve 31 is subjected to slow switching control from the valve body position 0 ° to the valve body position 180 ° in the hot water storage type water heater 100 of the second embodiment. As shown in FIG. 12, in the slow switching control in the second embodiment, the valve element 31h of the three-way valve 31 is temporarily stopped at a plurality of stages between the valve element position 0 ° and the valve element position 180 °. The valve body 31h is displaced (rotated) intermittently. In the example shown in FIG. 12, the valve body 31h is rotated by a predetermined angle (for example, 36 °) or for a predetermined time (for example, 5 seconds), and then the valve body 31h is repeatedly paused for a predetermined time (for example, 5 seconds). The valve body 31h is displaced in 45 seconds from the position 0 ° to the valve body position 180 °. The effect similar to that of the first embodiment can also be obtained by the slow switching control method of the second embodiment.

また、スロー切替制御において、図１２に示すように所定時間毎に弁体３１ｈを一時停止させることに代えて、浴槽入口側温度センサ５５により検知される追い焚き湯温を常に監視し、追い焚き湯温が目標温度（例えば、ユーザーが設定した浴槽目標温度＋５℃）以下に安定している場合には、弁体３１ｈを一段階（例えば１０°）進める方向に回転させ、追い焚き湯温が目標温度以下に安定していない場合には、追い焚き湯温が目標温度以下に安定するまで、または所定の待機時間が経過するまで、弁体３１ｈを停止させるようにしてもよい。これにより、利用側熱交換器２２から浴槽５０に流入する浴槽水の温度が上記目標温度を超えることをより確実に抑制することができる。   Further, in the slow switching control, instead of temporarily stopping the valve body 31h every predetermined time as shown in FIG. 12, the reheating hot water temperature detected by the bathtub inlet side temperature sensor 55 is always monitored, and reheating is performed. When the hot water temperature is stable below the target temperature (for example, the bath target temperature set by the user + 5 ° C.) or less, the valve body 31h is rotated in a direction to advance by one step (for example, 10 °). If the temperature is not stable below the target temperature, the valve body 31h may be stopped until the reheating water temperature is stabilized below the target temperature or until a predetermined standby time has elapsed. Thereby, it can suppress more reliably that the temperature of the bathtub water which flows in into the bathtub 50 from the utilization side heat exchanger 22 exceeds the said target temperature.

また、制御部７０は、スロー切替制御の実行中に、浴槽入口側温度センサ５５により検知される追い焚き湯温に基づいて、ヒートポンプユニット６０により供給される熱量（ヒートポンプユニット６０の加熱能力）が不足しているかどうかを判断し、ヒートポンプユニット６０により供給される熱量が不足していると判断した場合（例えば、弁体３１ｈを一段階または複数段階連続して回転させた後にも追い焚き湯温が目標温度以下に安定している場合）には、スロー切替制御を中止して、弁体３１ｈを通常の速さで弁体位置１８０°まで変位させるようにしても良い。これにより、ヒートポンプユニット６０により供給される熱量が不足しており、利用側熱交換器２２内の浴槽水が過剰に加熱されるおそれがない場合には、三方弁３１の切り替えを迅速に行い、ヒートポンプユニット６０から利用側熱交換器２２への循環流量を素早く上昇させることにより、追い焚き加熱能力を向上させることができる。   In addition, the control unit 70 determines the amount of heat supplied by the heat pump unit 60 (heating capacity of the heat pump unit 60) based on the reheating water temperature detected by the bathtub inlet side temperature sensor 55 during execution of the slow switching control. When it is determined whether or not the amount of heat supplied by the heat pump unit 60 is insufficient (for example, after the valve body 31h is rotated in one step or a plurality of steps continuously, the temperature of the reheating water is increased) When the temperature is stable below the target temperature), the slow switching control may be stopped and the valve body 31h may be displaced to the valve body position 180 ° at a normal speed. Thereby, when the amount of heat supplied by the heat pump unit 60 is insufficient and there is no fear that the bath water in the use side heat exchanger 22 is excessively heated, the three-way valve 31 is quickly switched, By rapidly increasing the circulation flow rate from the heat pump unit 60 to the use side heat exchanger 22, it is possible to improve the reheating heat capacity.

実施の形態３．
次に、図１３を参照して、本発明の実施の形態３について説明するが、上述した実施の形態との相違点を中心に説明し、同一部分または相当部分は同一符号を付し説明を省略する。本実施の形態３の貯湯式給湯機１００のハードウェア構成は、実施の形態１と同様であるので、説明を省略する。 Embodiment 3 FIG.
Next, the third embodiment of the present invention will be described with reference to FIG. 13. The description will focus on the differences from the above-described embodiment, and the same or corresponding parts will be described with the same reference numerals. Omitted. Since the hardware configuration of the hot water storage type hot water heater 100 of the third embodiment is the same as that of the first embodiment, the description thereof is omitted.

図１３は、本実施の形態３の貯湯式給湯機１００において三方弁３１を弁体位置０°から弁体位置１８０°へスロー切替制御を行う場合の弁体位置変化特性を示す図である。図１３に示すように、本実施の形態３におけるスロー切替制御では、三方弁３１の弁体３１ｈが弁体位置０°と弁体位置１８０°との間の複数の段階で一時停止するように弁体３１ｈを断続的に変位（回転）させる点では実施の形態２と同様であるが、一段階当たりの弁体３１ｈの変位量（ここでは回転角度）を途中で変化させる点で実施の形態２と相違する。   FIG. 13 is a diagram illustrating a valve body position change characteristic when the three-way valve 31 is subjected to slow switching control from the valve body position 0 ° to the valve body position 180 ° in the hot water storage type water heater 100 of the third embodiment. As shown in FIG. 13, in the slow switching control in the third embodiment, the valve body 31h of the three-way valve 31 is temporarily stopped at a plurality of stages between the valve body position 0 ° and the valve body position 180 °. Although it is the same as that of Embodiment 2 in the point which displaces (rotates) the valve body 31h intermittently, Embodiment is a point which changes the displacement amount (here rotation angle) of the valve body 31h per step in the middle. 2 and different.

図９に示すように、三方弁３１の弁体３１ｈの変位に伴って流量はリニアに変化するのではなく、弁体３１ｈの位置によって、弁体３１ｈの変位に対して流量が急激に変化する領域と流量変化が緩やかな領域とが存在する。すなわち、弁体位置９０°を含む中間領域では弁体３１ｈの変位に対して流量が急激に変化する。これに対し、切替初期の領域および切替完了付近の領域では、弁体３１ｈの変位に対して流量変化が緩やかである。   As shown in FIG. 9, the flow rate does not change linearly with the displacement of the valve body 31h of the three-way valve 31, but the flow rate rapidly changes with respect to the displacement of the valve body 31h depending on the position of the valve body 31h. There are a region and a region where the flow rate change is slow. That is, in the intermediate region including the valve body position 90 °, the flow rate rapidly changes with respect to the displacement of the valve body 31h. On the other hand, in the region at the initial stage of switching and the region near the completion of switching, the flow rate change is moderate with respect to the displacement of the valve body 31h.

上記の事項に鑑み、本実施の形態３のスロー切替制御では、以下のような制御を行う。図１３に示すように、切替開始から切替完了までの動作を複数の領域に分割し、切替初期から極端な流量変動が発生するまでの領域（例えば弁体位置０°〜６０°）を第一領域とし、この第一領域では１回の動作で三方弁３１を動作させる。すなわち、第一領域では、一段階当たりの弁体３１ｈの回転角度を６０°とする。その後、弁体３１ｈを一定時間（例えば７．５秒）停止させる。次に、第一領域の終点（ここでは弁体位置６０°）から極端な流量変動が発生する領域（例えば弁体位置６０°〜１６０°）を第二領域とする。この第二領域では、一段階当たりの弁体３１ｈの回転角度を第一領域よりも小さい回転角度（例えば１０°）とし、複数回に分けて弁体３１ｈを断続的に動作させ、各回の動作後は各々一定時間（例えば２．５秒）弁体３１ｈを停止させる。最後に、第二領域の終点（ここでは弁体位置１６０°）から切替完了までの領域（ここでは弁体位置１６０°〜１８０°）を第三領域とする。この第三領域では、一段階当たりの弁体３１ｈの回転角度を第二領域のよりも大きい回転角度（ここでは２０°）とし、第三領域の終点（ここでは弁体位置１８０°）まで１回の動作で切り替える。このような本実施の形態３のスロー切替制御によれば、弁体３１ｈの変位に対して流量が急激に変化し、利用側熱交換器２２内の浴槽水を過剰に加熱する可能性のある領域のみ弁体３１ｈを緩慢に動作させることで、利用側熱交換器２２内の浴槽水を過剰に加熱することを確実に防止しつつ、三方弁３１の切替開始から切替完了までの時間を実施の形態１および２と比べて短縮することができる。   In view of the above matters, in the slow switching control of the third embodiment, the following control is performed. As shown in FIG. 13, the operation from the start of switching to the completion of switching is divided into a plurality of regions, and a region (for example, valve body position 0 ° to 60 °) from the beginning of switching to the occurrence of extreme flow rate fluctuation is the first. In this first region, the three-way valve 31 is operated by a single operation. That is, in the first region, the rotation angle of the valve body 31h per step is set to 60 °. Thereafter, the valve body 31h is stopped for a certain time (for example, 7.5 seconds). Next, a region (for example, a valve body position of 60 ° to 160 °) in which an extreme flow rate fluctuation occurs from the end point of the first region (here, the valve body position of 60 °) is set as the second region. In this second region, the rotation angle of the valve body 31h per step is set to a rotation angle smaller than that of the first region (for example, 10 °), and the valve body 31h is operated intermittently in a plurality of times. Thereafter, the valve body 31h is stopped for a predetermined time (for example, 2.5 seconds). Finally, a region from the end point of the second region (here, the valve body position 160 °) to the completion of switching (here, the valve body position 160 ° to 180 °) is defined as a third region. In this third region, the rotation angle of the valve body 31h per step is set to a rotation angle larger than that of the second region (here, 20 °), and 1 to the end point of the third region (here, the valve body position is 180 °). Switch by one operation. According to the slow switching control of the third embodiment as described above, the flow rate is rapidly changed with respect to the displacement of the valve body 31h, and there is a possibility that the bath water in the use side heat exchanger 22 is excessively heated. By slowly operating the valve body 31h only in the region, the time from the start of switching of the three-way valve 31 to the completion of switching is reliably prevented while reliably preventing the bath water in the use side heat exchanger 22 from being excessively heated. This can be shortened as compared with the first and second embodiments.

また、スロー切替制御では、上記と同様の考え方に基づき、予め実験で得られた三方弁３１の弁体３１ｈの位置による流量特性に応じて、所定時間毎（例えば１０秒毎）に弁体３１ｈを一段階回転させる場合の一段階当たりの回転角度を可変とし、利用側熱交換器２２に流入する流量が極端に増加する弁体位置領域では弁体３１ｈの一段階当たりの回転角度を小さい角度（例えば５°）とし、利用側熱交換器２２に流入する流量が極端に変化しない弁体位置領域では弁体３１ｈの一段階当たりの回転角度を大きい角度（例えば２０°）とするように制御しても良い。これにより、上記と同様の効果が得られる。また、この場合において、三方弁３１の切替途中の、ヒートポンプユニット６０からタンク上部配管４３および上部口１５を経由して貯湯タンク１０の上部領域へ流入する流量と、ヒートポンプユニット６０からタンク上部配管４３および利用側熱交換器一次側入口配管４５を経由して利用側熱交換器２２へ流入する流量との比率を予め実験で把握し、その流量比に基づき、流量比率が急激に変化することのないように、弁体３１ｈの一段階当たりの回転角度を設定することが好ましい。これにより、ヒートポンプユニット６０から利用側熱交換器２２へ流入する流量の急増をより確実に防止することができる。さらに、その実験で把握された流量比率に基づき、弁体３１ｈの一段階当たりの回転角度を、利用側熱交換器２２から浴槽５０へ供給される浴槽水の温度（すなわち追い焚き湯温）の温度変動が最も小さくなる回転角度に設定してもよい。   Further, in the slow switching control, based on the same concept as described above, the valve body 31h is provided at predetermined time intervals (for example, every 10 seconds) according to the flow rate characteristics depending on the position of the valve body 31h of the three-way valve 31 obtained in advance by experiments. In the valve body position region where the flow angle flowing into the use side heat exchanger 22 is extremely increased, the rotation angle per stage of the valve body 31h is a small angle. (For example, 5 °), and control is performed so that the rotation angle per step of the valve body 31h is a large angle (for example, 20 °) in the valve body position region where the flow rate flowing into the use-side heat exchanger 22 does not change extremely. You may do it. Thereby, the effect similar to the above is acquired. Further, in this case, the flow rate flowing from the heat pump unit 60 to the upper region of the hot water storage tank 10 via the tank upper pipe 43 and the upper port 15 during the switching of the three-way valve 31, and the tank upper pipe 43 from the heat pump unit 60. In addition, the ratio of the flow rate flowing into the use side heat exchanger 22 via the use side heat exchanger primary side inlet pipe 45 is grasped in advance by experiments, and the flow rate ratio changes rapidly based on the flow rate ratio. It is preferable to set the rotation angle per stage of the valve body 31h so as not to be present. Thereby, it is possible to more reliably prevent a rapid increase in the flow rate flowing from the heat pump unit 60 to the use side heat exchanger 22. Furthermore, based on the flow rate ratio obtained in the experiment, the rotation angle per stage of the valve body 31h is set to the temperature of the bath water supplied from the use side heat exchanger 22 to the bath 50 (that is, the reheating hot water temperature). You may set to the rotation angle where temperature fluctuation becomes the smallest.

また、上述した各実施の形態では、三方弁３１を弁体位置０°から１８０°へ切り替える場合について説明したが、三方弁３１を弁体位置１８０°から０°へ切り替える時にも、利用側熱交換器２２内の浴槽水の過剰加熱、もしくは、加熱能力不足が発生する場合には、同様のスロー切替制御を適用してもよい。   In each of the above-described embodiments, the case where the three-way valve 31 is switched from the valve body position 0 ° to 180 ° has been described. However, when the three-way valve 31 is switched from the valve body position 180 ° to 0 °, the use side heat Similar slow switching control may be applied when overheating of the bath water in the exchanger 22 or insufficient heating capacity occurs.

さらに、上述した各実施の形態では、沸き上げ運転の実行中に発生した追い焚き運転の実施要求に応じるためにヒートポンプ追い焚き運転に移行する場合の三方弁３１のスロー切替制御について説明したが、給湯混合弁３３からの給湯動作中に発生した追い焚き運転の実施要求に応じるためにヒートポンプ追い焚き運転またはタンク戻し追い焚き運転を開始する場合に、給湯配管３の流量が極端に減少し、給湯混合弁３３から外部給湯栓に供給する湯水の温度が極端に変動するといった課題への対処においても、三方弁３１の切り替えにスロー切替制御を適用することで、外部給湯栓に供給する湯水の温度の変動を抑制することが可能である。   Furthermore, in each of the above-described embodiments, the slow switching control of the three-way valve 31 when shifting to the heat pump reheating operation in order to respond to the request for performing the reheating operation that occurred during the boiling operation has been described. When the heat pump reheating operation or the tank return reheating operation is started in order to respond to the request for the reheating operation generated during the hot water supply operation from the hot water supply mixing valve 33, the flow rate of the hot water supply pipe 3 is extremely reduced, Even in dealing with the problem that the temperature of hot water supplied from the mixing valve 33 to the external hot water supply fluctuates extremely, the temperature of the hot water supplied to the external hot water supply by applying the slow switching control to the switching of the three-way valve 31. Can be suppressed.

１ 貯湯タンクユニット、２，４ 給水配管、３ 給湯配管、５ 混合給湯配管、
１０ 貯湯タンク、１１，１２ 貯湯温度センサ、１４ 給水口、１５ 上部口、
１６ 下部口、１７ 戻し口、２１ 循環ポンプ、２２ 利用側熱交換器、
３１ 三方弁、３１ａ ａポート、３１ｂ ｂポート、３１ｃ ｃポート、
３１ｅ 弁枠、３１ｆ ステッピングモータ、３１ｇ 回転軸、３１ｈ 弁体、
３１ｉ 連通部、３２ 四方弁、３３ 給湯混合弁、４０ タンク下部配管、
４１ ヒートポンプ入口配管、４２ ヒートポンプ出口配管、４３ タンク上部配管、
４４ タンク戻し配管、４５ 利用側熱交換器一次側入口配管、
４６ 利用側熱交換器一次側出口配管、４７ バイパス配管、５０ 浴槽、
５１ 浴槽水循環回路、５２ 二次側循環ポンプ、５３ 浴槽出口側温度センサ、
５５ 浴槽入口側温度センサ、６０ ヒートポンプユニット、６１ 圧縮機、
６２ 沸き上げ用熱交換器、６３ 膨張弁、６４ 空気熱交換器、６５ 冷媒循環配管、
６６ ＨＰ出口側温度センサ、７０ 制御部、１００ 貯湯式給湯機 1 Hot water storage tank unit, 2, 4 Hot water supply piping, 3 Hot water supply piping, 5 Mixed hot water supply piping,
10 Hot water storage tank, 11, 12 Hot water storage temperature sensor, 14 Water supply port, 15 Upper port,
16 Lower port, 17 Return port, 21 Circulation pump, 22 User side heat exchanger,
31 three-way valve, 31a port a, 31b port b, 31c port c,
31e Valve frame, 31f Stepping motor, 31g Rotating shaft, 31h Valve body,
31i communication part, 32 four-way valve, 33 hot water mixing valve, 40 tank lower pipe,
41 Heat pump inlet piping, 42 Heat pump outlet piping, 43 Tank upper piping,
44 Tank return piping, 45 User side heat exchanger primary side inlet piping,
46 user side heat exchanger primary side outlet piping, 47 bypass piping, 50 bathtubs,
51 Bath water circulation circuit, 52 Secondary circulation pump, 53 Bath outlet temperature sensor,
55 Bathtub inlet side temperature sensor, 60 Heat pump unit, 61 Compressor,
62 heat exchanger for boiling, 63 expansion valve, 64 air heat exchanger, 65 refrigerant circulation piping,
66 HP outlet side temperature sensor, 70 control unit, 100 hot water storage type hot water supply machine

Claims (8)

湯水を貯留する貯湯タンクと、
水を加熱して湯を生成可能な加熱手段と、
湯水を循環させる循環ポンプと、
被加熱物と熱源水とを熱交換させることにより前記被加熱物を加熱する利用側熱交換器と、
前記貯湯タンクの下部領域から取り出した水を前記加熱手段に送り、前記加熱手段で加熱されて生成した湯を前記貯湯タンクに送って前記貯湯タンクの上部領域に流入させる沸き上げ水循環流路と、前記加熱手段で加熱されて生成した湯を前記熱源水として前記利用側熱交換器に送り、前記利用側熱交換器を通過した前記熱源水を前記加熱手段に送って再循環させる熱源水循環流路とを形成可能な流路系と、
弁体を有し、前記弁体の変位により、前記沸き上げ水循環流路を形成させる第一流路形態と、前記熱源水循環流路を形成させる第二流路形態とに切り替え可能な流路切替手段と、
前記沸き上げ水循環流路に前記循環ポンプにより湯水を循環させる沸き上げ運転の実行中に、前記流路切替手段を前記第一流路形態から前記第二流路形態に切り替えて、前記熱源水循環流路に前記循環ポンプにより前記熱源水を循環させて前記被加熱物を加熱する熱源水循環運転に移行する場合に、前記沸き上げ運転の非実行時に前記流路切替手段を前記第一流路形態から前記第二流路形態に切り替える場合に比べて、前記弁体が前記第一流路形態の位置から前記第二流路形態の位置に変位するまでの時間が長くなるように前記流路切替手段の動作を制御するスロー切替制御を行う制御手段と、
前記利用側熱交換器による加熱後の前記被加熱物の温度を検知する温度検知手段と、
を備え、
前記制御手段は、前記スロー切替制御において、前記弁体が前記第一流路形態の位置と前記第二流路形態の位置との間の複数の段階で一時停止するように前記弁体を断続的に変位させ、
前記制御手段は、前記スロー切替制御において、前記加熱後の前記被加熱物の温度が目標温度以下に安定している場合には前記弁体を一段階進め、前記加熱後の前記被加熱物の温度が前記目標温度以下に安定しない場合には、前記加熱後の前記被加熱物の温度が前記目標温度以下に安定するまで、または所定の待機時間が経過するまで、前記弁体を一時停止させ、
前記制御手段は、前記スロー切替制御の実行中に、前記温度検知手段により検知された前記加熱後の前記被加熱物の温度に基づいて前記加熱手段により供給される熱量が不足しているか否かを判断し、前記加熱手段により供給される熱量が不足していると判断した場合には、前記スロー切替制御を中止して前記弁体を通常の速さで前記第二流路形態の位置まで変位させる貯湯式給湯機。 A hot water storage tank for storing hot water,
Heating means capable of generating water by heating water;
A circulation pump for circulating hot water,
A use side heat exchanger that heats the object to be heated by exchanging heat between the object to be heated and the heat source water;
Boiled water circulation passage for sending water taken out from the lower region of the hot water storage tank to the heating means, sending hot water heated by the heating means to the hot water storage tank and flowing into the upper region of the hot water storage tank; Heat source water circulation flow path for sending hot water generated by heating by the heating means to the use side heat exchanger as the heat source water and sending the heat source water that has passed through the use side heat exchanger to the heating means for recirculation A flow path system capable of forming
A flow path switching means having a valve body and capable of switching between a first flow path form for forming the boiling water circulation flow path and a second flow path form for forming the heat source water circulation flow path by displacement of the valve body When,
During the boiling operation in which hot water is circulated by the circulation pump to the boiling water circulation channel, the channel switching means is switched from the first channel configuration to the second channel configuration, and the heat source water circulation channel When the heat source water is circulated by the circulation pump to shift to the heat source water circulation operation in which the object to be heated is heated, the flow path switching means is moved from the first flow path configuration to the first flow path when the boiling operation is not performed. Compared with the case of switching to the two-channel configuration, the operation of the channel switching means is performed so that the time until the valve body is displaced from the position of the first channel configuration to the position of the second channel configuration is increased. Control means for performing slow switching control to be controlled;
Temperature detecting means for detecting the temperature of the object to be heated after heating by the use side heat exchanger;
Equipped with a,
In the slow switching control, the control means intermittently stops the valve body so that the valve body temporarily stops at a plurality of stages between the position of the first flow path form and the position of the second flow path form. Is displaced to
In the slow switching control, when the temperature of the heated object after heating is stable below a target temperature in the slow switching control, the control unit advances the valve body by one step, and the heated object of the heated object is heated. When the temperature is not stable below the target temperature, the valve body is temporarily stopped until the temperature of the heated object after the heating stabilizes below the target temperature or until a predetermined waiting time elapses. ,
Whether the control means is short of the amount of heat supplied by the heating means based on the temperature of the heated object detected by the temperature detection means during execution of the slow switching control. If it is determined that the amount of heat supplied by the heating means is insufficient, the slow switching control is stopped and the valve body is moved to the position of the second flow path form at a normal speed. hot-water storage type water heater Ru is displaced. 湯水を貯留する貯湯タンクと、
水を加熱して湯を生成可能な加熱手段と、
湯水を循環させる循環ポンプと、
被加熱物と熱源水とを熱交換させることにより前記被加熱物を加熱する利用側熱交換器と、
前記貯湯タンクの下部領域から取り出した水を前記加熱手段に送り、前記加熱手段で加熱されて生成した湯を前記貯湯タンクに送って前記貯湯タンクの上部領域に流入させる沸き上げ水循環流路と、前記加熱手段で加熱されて生成した湯を前記熱源水として前記利用側熱交換器に送り、前記利用側熱交換器を通過した前記熱源水を前記加熱手段に送って再循環させる熱源水循環流路とを形成可能な流路系と、
弁体を有し、前記弁体の変位により、前記沸き上げ水循環流路を形成させる第一流路形態と、前記熱源水循環流路を形成させる第二流路形態とに切り替え可能な流路切替手段と、
前記沸き上げ水循環流路に前記循環ポンプにより湯水を循環させる沸き上げ運転の実行中に、前記流路切替手段を前記第一流路形態から前記第二流路形態に切り替えて、前記熱源水循環流路に前記循環ポンプにより前記熱源水を循環させて前記被加熱物を加熱する熱源水循環運転に移行する場合に、前記沸き上げ運転の非実行時に前記流路切替手段を前記第一流路形態から前記第二流路形態に切り替える場合に比べて、前記弁体が前記第一流路形態の位置から前記第二流路形態の位置に変位するまでの時間が長くなるように前記流路切替手段の動作を制御するスロー切替制御を行う制御手段と、
を備え、
前記制御手段は、前記スロー切替制御において、前記弁体が前記第一流路形態の位置と前記第二流路形態の位置との間の複数の段階で一時停止するように前記弁体を断続的に変位させ、
前記制御手段は、前記スロー切替制御において、前記弁体の一段階当たりの変位量を変化させる貯湯式給湯機。 A hot water storage tank for storing hot water,
Heating means capable of generating water by heating water;
A circulation pump for circulating hot water,
A use side heat exchanger that heats the object to be heated by exchanging heat between the object to be heated and the heat source water;
Boiled water circulation passage for sending water taken out from the lower region of the hot water storage tank to the heating means, sending hot water heated by the heating means to the hot water storage tank and flowing into the upper region of the hot water storage tank; Heat source water circulation flow path for sending hot water generated by heating by the heating means to the use side heat exchanger as the heat source water and sending the heat source water that has passed through the use side heat exchanger to the heating means for recirculation A flow path system capable of forming
A flow path switching means having a valve body and capable of switching between a first flow path form for forming the boiling water circulation flow path and a second flow path form for forming the heat source water circulation flow path by displacement of the valve body When,
During the boiling operation in which hot water is circulated by the circulation pump to the boiling water circulation channel, the channel switching means is switched from the first channel configuration to the second channel configuration, and the heat source water circulation channel When the heat source water is circulated by the circulation pump to shift to the heat source water circulation operation in which the object to be heated is heated, the flow path switching means is moved from the first flow path configuration to the first flow path when the boiling operation is not performed. Compared with the case of switching to the two-channel configuration, the operation of the channel switching means is performed so that the time until the valve body is displaced from the position of the first channel configuration to the position of the second channel configuration is increased. Control means for performing slow switching control to be controlled;
Equipped with a,
In the slow switching control, the control means intermittently stops the valve body so that the valve body temporarily stops at a plurality of stages between the position of the first flow path form and the position of the second flow path form. Is displaced to
Wherein, in the slow-switching control, hot-water storage type water heater Ru changing the displacement of one step per the valve body. 湯水を貯留する貯湯タンクと、
水を加熱して湯を生成可能な加熱手段と、
湯水を循環させる循環ポンプと、
被加熱物と熱源水とを熱交換させることにより前記被加熱物を加熱する利用側熱交換器と、
前記貯湯タンクの下部領域から取り出した水を前記加熱手段に送り、前記加熱手段で加熱されて生成した湯を前記貯湯タンクに送って前記貯湯タンクの上部領域に流入させる沸き上げ水循環流路と、前記加熱手段で加熱されて生成した湯を前記熱源水として前記利用側熱交換器に送り、前記利用側熱交換器を通過した前記熱源水を前記加熱手段に送って再循環させる熱源水循環流路とを形成可能な流路系と、
弁体を有し、前記弁体の変位により、前記沸き上げ水循環流路を形成させる第一流路形態と、前記熱源水循環流路を形成させる第二流路形態とに切り替え可能な流路切替手段と、
前記沸き上げ水循環流路に前記循環ポンプにより湯水を循環させる沸き上げ運転の実行中に、前記流路切替手段を前記第一流路形態から前記第二流路形態に切り替えて、前記熱源水循環流路に前記循環ポンプにより前記熱源水を循環させて前記被加熱物を加熱する熱源水循環運転に移行する場合に、前記沸き上げ運転の非実行時に前記流路切替手段を前記第一流路形態から前記第二流路形態に切り替える場合に比べて、前記弁体が前記第一流路形態の位置から前記第二流路形態の位置に変位するまでの時間が長くなるように前記流路切替手段の動作を制御するスロー切替制御を行う制御手段と、
を備え、
前記制御手段は、前記スロー切替制御において、前記弁体が前記第一流路形態の位置と前記第二流路形態の位置との間の複数の段階で一時停止するように前記弁体を断続的に変位させ、
前記制御手段は、前記スロー切替制御において、前記弁体が前記第一流路形態の位置から前記第二流路形態の位置に変位するまでの間を第一領域、第二領域および第三領域の順に分け、前記第二領域における前記弁体の一段階当たりの変位量を前記第一領域における前記弁体の一段階当たりの変位量より小さくし、前記第三領域における前記弁体の一段階当たりの変位量を前記第二領域における前記弁体の一段階当たりの変位量より大きくする貯湯式給湯機。 A hot water storage tank for storing hot water,
Heating means capable of generating water by heating water;
A circulation pump for circulating hot water,
A use side heat exchanger that heats the object to be heated by exchanging heat between the object to be heated and the heat source water;
Boiled water circulation passage for sending water taken out from the lower region of the hot water storage tank to the heating means, sending hot water heated by the heating means to the hot water storage tank and flowing into the upper region of the hot water storage tank; Heat source water circulation flow path for sending hot water generated by heating by the heating means to the use side heat exchanger as the heat source water and sending the heat source water that has passed through the use side heat exchanger to the heating means for recirculation A flow path system capable of forming
A flow path switching means having a valve body and capable of switching between a first flow path form for forming the boiling water circulation flow path and a second flow path form for forming the heat source water circulation flow path by displacement of the valve body When,
During the boiling operation in which hot water is circulated by the circulation pump to the boiling water circulation channel, the channel switching means is switched from the first channel configuration to the second channel configuration, and the heat source water circulation channel When the heat source water is circulated by the circulation pump to shift to the heat source water circulation operation in which the object to be heated is heated, the flow path switching means is moved from the first flow path configuration to the first flow path when the boiling operation is not performed. Compared with the case of switching to the two-channel configuration, the operation of the channel switching means is performed so that the time until the valve body is displaced from the position of the first channel configuration to the position of the second channel configuration is increased. Control means for performing slow switching control to be controlled;
Equipped with a,
In the slow switching control, the control means intermittently stops the valve body so that the valve body temporarily stops at a plurality of stages between the position of the first flow path form and the position of the second flow path form. Is displaced to
In the slow switching control, the control means includes a first region, a second region, and a third region until the valve body is displaced from the position in the first flow path form to the position in the second flow path form. Dividing in order, the amount of displacement per stage of the valve body in the second region is smaller than the amount of displacement per stage of the valve body in the first region, and per stage of the valve body in the third region water storage type water heater that be greater than the amount of displacement of one step per the valve body in the displacement the second area of the. 前記貯湯タンクの前記下部領域と前記循環ポンプの吸入口とを接続する流路の途中に前記流路切替手段として設けられた第一流路切替弁と、
前記加熱手段の出湯口と前記貯湯タンクの前記上部領域とを接続する流路の途中に設けられた第二流路切替弁と、
前記第二流路切替弁と前記貯湯タンクの前記上部領域とを接続する流路から分岐して、前記利用側熱交換器に接続された利用側熱交換器一次側入口配管と、
前記利用側熱交換器と、前記第一流路切替弁とを接続する利用側熱交換器一次側出口配管と、
前記貯湯タンクに設けられた熱源水戻し口と前記第二流路切替弁とを接続する熱源水戻し流路と、
前記循環ポンプの吐出口と前記加熱手段の入水口とを接続する流路から分岐して前記第二流路切替弁に接続されたバイパス流路と、
を備え、
前記第一流路切替弁の前記第一流路形態は、前記貯湯タンクの前記下部領域を前記循環ポンプを介して前記加熱手段の入水口に連通させて前記利用側熱交換器一次側出口配管を遮断する流路形態であり、
前記第一流路切替弁の前記第二流路形態は、前記利用側熱交換器一次側出口配管を前記循環ポンプを介して前記加熱手段の入水口に連通させて前記貯湯タンクの前記下部領域と前記加熱手段の入水口との間を遮断する流路形態であり、
前記第二流路切替弁は、前記加熱手段の出湯口を前記貯湯タンクの前記上部領域に連通させて前記バイパス流路および前記熱源水戻し流路を遮断する流路形態と、前記バイパス流路を前記熱源水戻し流路に連通させて前記加熱手段の出湯口と前記貯湯タンクの前記上部領域との間を遮断する流路形態とを選択可能であり、
前記第一流路切替弁を前記第二流路形態に切り替え、前記第二流路切替弁により前記バイパス流路を前記熱源水戻し流路に連通させて前記加熱手段の出湯口と前記貯湯タンクの前記上部領域との間を遮断し、前記循環ポンプを稼動させることにより、前記貯湯タンクの前記上部領域から取り出された湯を前記利用側熱交換器一次側入口配管を通して前記熱源水として前記利用側熱交換器に送り、前記利用側熱交換器を通過した前記熱源水を前記利用側熱交換器一次側出口配管、前記第一流路切替弁、前記循環ポンプ、前記バイパス流路、前記第二流路切替弁および前記熱源水戻し流路の順に通過させて前記熱源水戻し口から前記貯湯タンク内に流入させる熱源水タンク戻し運転を実行可能である請求項１乃至３の何れか１項記載の貯湯式給湯機。 A first flow path switching valve provided as the flow path switching means in the middle of the flow path connecting the lower region of the hot water storage tank and the suction port of the circulation pump;
A second flow path switching valve provided in the middle of the flow path connecting the hot water outlet of the heating means and the upper region of the hot water storage tank;
A use side heat exchanger primary side inlet pipe branched from a flow path connecting the second flow path switching valve and the upper region of the hot water storage tank, and connected to the use side heat exchanger;
A use side heat exchanger primary side outlet pipe connecting the use side heat exchanger and the first flow path switching valve;
A heat source water return flow path connecting the heat source water return port provided in the hot water storage tank and the second flow path switching valve;
A bypass flow path branched from the flow path connecting the discharge port of the circulation pump and the water inlet of the heating means and connected to the second flow path switching valve;
With
The first flow path configuration of the first flow path switching valve is such that the lower area of the hot water storage tank is communicated with the water inlet of the heating means via the circulation pump to shut off the use side heat exchanger primary side outlet pipe. The flow path form
The second flow path configuration of the first flow path switching valve is such that the use side heat exchanger primary side outlet pipe communicates with the water inlet of the heating means via the circulation pump and the lower region of the hot water storage tank. It is a flow path configuration for blocking between the water inlet of the heating means,
The second flow path switching valve has a flow path configuration in which a hot water outlet of the heating means is communicated with the upper region of the hot water storage tank to block the bypass flow path and the heat source water return flow path, and the bypass flow path A flow path configuration that allows communication between the heat source water return flow path and a gap between the hot water outlet of the heating means and the upper region of the hot water storage tank can be selected.
The first flow path switching valve is switched to the second flow path configuration, and the second flow path switching valve allows the bypass flow path to communicate with the heat source water return flow path so that the outlet of the heating means and the hot water storage tank By shutting off from the upper region and operating the circulation pump, the hot water taken out from the upper region of the hot water storage tank is used as the heat source water through the user side heat exchanger primary side inlet pipe as the heat source water. The heat source water that has been sent to the heat exchanger and passed through the use side heat exchanger, the use side heat exchanger primary side outlet pipe, the first flow path switching valve, the circulation pump, the bypass flow path, the second flow by passing the road switching valve and the order of the heat source water return flow path of any one of claims 1 to 3 wherein the possible is performed a heat source water tank return operation to flow into the hot water storage tank from the heat source water return opening Hot water storage hot water supply . 前記循環ポンプにより前記熱源水を前記利用側熱交換器に供給しているときに、前記被加熱物の温度が目標温度となるように前記循環ポンプの出力を制御する循環ポンプ制御手段を備える請求項１乃至４の何れか１項記載の貯湯式給湯機。 A circulation pump control unit that controls an output of the circulation pump so that a temperature of the object to be heated becomes a target temperature when the heat source water is supplied to the use side heat exchanger by the circulation pump. Item 5. A hot water storage type water heater according to any one of Items 1 to 4 . 前記利用側熱交換器による加熱後の前記被加熱物の温度を検知する温度検知手段を備え、
前記制御手段は、前記スロー切替制御において、前記加熱後の前記被加熱物の温度が目標温度以下に安定している場合には前記弁体を一段階進め、前記加熱後の前記被加熱物の温度が前記目標温度以下に安定しない場合には、前記加熱後の前記被加熱物の温度が前記目標温度以下に安定するまで、または所定の待機時間が経過するまで、前記弁体を一時停止させる請求項２または３記載の貯湯式給湯機。 A temperature detecting means for detecting the temperature of the object to be heated after being heated by the use side heat exchanger;
In the slow switching control, when the temperature of the heated object after heating is stable below a target temperature in the slow switching control, the control unit advances the valve body by one step, and the heated object of the heated object is heated. When the temperature is not stable below the target temperature, the valve body is temporarily stopped until the temperature of the heated object after the heating stabilizes below the target temperature or until a predetermined waiting time elapses. The hot water storage type water heater according to claim 2 or 3 . 前記弁体が前記第一流路形態の位置と前記第二流路形態の位置との間にあるときの、前記加熱手段から前記貯湯タンクの前記上部領域への流量と、前記加熱手段から前記利用側熱交換器への流量との比率に基づいて、前記弁体の一段階当たりの変位量が設定されている請求項２または３記載の貯湯式給湯機。 The flow rate from the heating means to the upper region of the hot water storage tank when the valve body is between the position of the first flow path form and the position of the second flow path form, and the utilization from the heating means The hot water storage type hot water heater according to claim 2 or 3 , wherein a displacement amount per stage of the valve body is set based on a ratio to a flow rate to the side heat exchanger. 前記利用側熱交換器は、浴槽から前記利用側熱交換器を経由して前記浴槽に戻るように循環する浴槽水を前記被加熱物として加熱するものである請求項１乃至７の何れか１項記載の貯湯式給湯機。 The use side heat exchanger, any one of claims 1 to 7 the bathtub water is to heat as the object to be heated circulates through the utilization-side heat exchanger from the bath back to the bath The hot water storage type water heater described in the item.
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