JP4778299B2

JP4778299B2 - Hot water storage type hot water supply device and method for changing standby opening of hot water mixing valve

Info

Publication number: JP4778299B2
Application number: JP2005335440A
Authority: JP
Inventors: 誠本間; 基阿部
Original assignee: Corona Corp
Current assignee: Corona Corp
Priority date: 2005-11-21
Filing date: 2005-11-21
Publication date: 2011-09-21
Anticipated expiration: 2025-11-21
Also published as: JP2007139345A

Description

本発明は、貯湯式給湯装置およびその給湯混合弁の待機開度変更方法に関する。 The present invention relates to a hot water storage type hot water supply apparatus and a method for changing a standby opening degree of the hot water supply mixing valve.

従来の自然冷媒式ヒートポンプ給湯機、つまり、エコキュートと呼ばれる貯湯式給湯装置は、空気から熱を吸収して二酸化炭素（ＣＯ_２）に移し、コンプレッサーでＣＯ_２を高温にして貯湯タンクユニットからの水に熱を伝え、貯湯タンクの上層部の湯水の温度を約９０℃の熱湯にする加熱手段であるヒートポンプユニットと、湯水を常時、貯蔵する貯湯タンクで構成しており、燃焼することがないため、安全で、しかも、環境にやさしい。 Conventional natural refrigerant heat pump water heaters, that is, hot water storage water heaters called Ecocute, absorb heat from the air and transfer it to carbon dioxide (CO ₂ ), and make CO ₂ into a high temperature with a compressor to make water from the hot water storage tank unit. Because it is composed of a heat pump unit, which is a heating means that transfers heat to the hot water in the upper layer of the hot water storage tank to make the hot water temperature of about 90 ° C, and a hot water storage tank that always stores hot water, so that it does not burn Safe, environmentally friendly.

図４は従来の貯湯式給湯装置を示す給湯回路図である。図４に示すように、この貯湯式給湯装置１０１は、深夜時間帯に湯水を沸き上げて貯湯し、この貯湯した湯水を給湯に用いるもので、貯湯タンクユニット１は湯水を貯湯する貯湯タンク２を備えたユニットであり、ヒートポンプユニット３は貯湯タンク２内の湯水を加熱するユニット、給湯端である給湯栓４は台所や洗面所等に設けられた給湯蛇口、給湯リモコン５はこの給湯栓４の近傍に設けられた給湯リモコン、浴槽６は風呂（ふろ）、リモコン７は浴室に設けられている。この貯湯式給湯装置１０１では、「沸き上げ運転」や「給湯運転」、浴槽６への「湯張り運転」や「保温運転」または「追い焚き運転」等ができるようになっている。（例えば、特許文献１参照）。 FIG. 4 is a hot water supply circuit diagram showing a conventional hot water storage type hot water supply apparatus. As shown in FIG. 4, this hot water storage type hot water supply apparatus 101 boils hot water at midnight and stores hot water, and uses the stored hot water for hot water supply. A hot water storage tank unit 1 stores a hot water tank 2 for storing hot water. The heat pump unit 3 is a unit for heating hot water in the hot water storage tank 2, the hot water tap 4 as a hot water supply end is a hot water faucet provided in a kitchen or a washroom, and the hot water remote controller 5 is a hot water tap 4. The hot water remote control provided in the vicinity of the tub, the bathtub 6 is a bath, and the remote control 7 is provided in the bathroom. This hot water storage type hot water supply apparatus 101 can perform “boiling operation”, “hot water supply operation”, “hot water operation”, “heat insulation operation”, “reheating operation”, etc. to the bathtub 6. (For example, refer to Patent Document 1).

給湯制御部５５の動作について、給湯混合弁３７のフィードバック制御に関する一例を挙げて説明する。給湯栓４の栓が開口されて流量カウンタ５９により出湯が検出されると、給湯制御部５５は給湯温度センサ４０で検出された湯温がリモコン５等で予め設定された湯温となるように給湯混合弁３７の開度をフィードバック制御する。また、フィードフォワード制御として、給湯混合弁３７は、給湯栓４からの出湯が停止した後も、つぎの出湯（再出頭）に備えて適正な開度を維持して待機した状態となっており、これにより、再出湯初期時のアンダーシュート（湯温が設定値を下回る現象）やオーバーシュート（湯温が設定値を上回る現象）を抑制している。また、給湯制御部５５は、中温水混合弁３０と給湯混合弁３７についても開度に関する制御を行い、さらに、貯湯タンク２に設けた複数の貯湯温度センサ４８の検出に基づいて、加熱手段（ヒートポンプユニット）３とヒートポンプ循環ポンプ１７の制御も行うようになっている。
特開２００４−１１６８８９（段落００１３〜００５６、図１〜図８） The operation of the hot water supply control unit 55 will be described with an example regarding feedback control of the hot water supply mixing valve 37. When the tap of the hot water tap 4 is opened and hot water is detected by the flow rate counter 59, the hot water control unit 55 causes the hot water temperature detected by the hot water temperature sensor 40 to become a hot water temperature preset by the remote controller 5 or the like. The opening degree of the hot water supply mixing valve 37 is feedback-controlled. In addition, as feedforward control, the hot water supply mixing valve 37 is in a state of waiting while maintaining an appropriate opening degree in preparation for the next hot water (re-heading) even after the hot water from the hot water tap 4 is stopped. As a result, undershoot (a phenomenon in which the hot water temperature falls below the set value) and overshoot (a phenomenon in which the hot water temperature exceeds the set value) at the initial stage of re-watering are suppressed. The hot water supply control unit 55 also controls the opening degree of the intermediate hot water mixing valve 30 and the hot water mixing valve 37, and further, based on the detection of a plurality of hot water storage temperature sensors 48 provided in the hot water storage tank 2, heating means ( The heat pump unit 3 and the heat pump circulation pump 17 are also controlled.
JP 2004-116889 (paragraphs 0013 to 0056, FIGS. 1 to 8)

しかしながら、例えば、給湯出湯停止中に「タンクからの放熱、ふろ出湯、ふろ追炊きにより熱源温度が下がってきた場合」や、「沸き増しにより熱源温度が上がってきた場合」、「給水温度が著しく変化した場合」などにより、熱源温度または給水温度が変化したとき、それまで適正だった給湯出湯停止中の待機開度が適正ではなくなり、再出湯時にオーバーシュートや、アンダーシュートが発生し、出湯性能が低下するといった問題があった。なお、「熱源温度」とは、ここでは貯湯ユニット内の貯湯温度をいう。 However, for example, when the hot water supply and hot water supply is stopped, “when the heat source temperature has fallen due to heat dissipation from the tank, hot tapping hot water, and additional cooking of the bath”, “when the heat source temperature has increased due to increased boiling”, “ When the heat source temperature or the feed water temperature changes due to, for example, `` changes '', the standby opening when hot water supply hot water is stopped is not appropriate, and overshoot and undershoot occur during re-draining, and the hot water performance There has been a problem of lowering. The “heat source temperature” here refers to the hot water storage temperature in the hot water storage unit.

そこで、本発明は、これらの問題点を解決するために創案されたものであり、例えば、「放熱、ふろ出湯、ふろ追炊きにより熱源温度が下がってきた場合」や、「沸き増しにより熱源温度が上がってきた場合」や、「給水温度が著しく変化した場合」などにより、熱源温度または給水温度が変化したときであっても、オーバーシュートまたはアンダーシュートの発生が小さく、出湯性能が低下しない貯湯式給湯装置と、その給湯混合弁の待機開度変更方法を提供することを課題とする。 Therefore, the present invention was devised to solve these problems. For example, “when the heat source temperature is lowered due to heat dissipation, hot tapping hot water, and additional cooking of the bath” or “the heat source temperature is increased by boiling. Even when the heat source temperature or the feed water temperature changes due to, for example, when the water temperature rises or when the feed water temperature has changed significantly, hot water storage that does not cause overshooting or undershooting to occur and the outlet performance does not deteriorate. It is an object of the present invention to provide a hot water supply apparatus and a method for changing the standby opening degree of the hot water mixing valve.

請求項１に係る貯湯式給湯装置（１００）の発明は、給水管（９）が下端部に接続され、出湯管（８）が上端部に接続されている貯湯タンク（２）と、この貯湯タンク（２）内の湯水を高温に加熱する加熱手段（３）と、貯湯タンク（２）の前記給水管（９）よりも高くかつ前記出湯管（８）よりも低い中間位置に設けられた中温水出湯口（３４）と、前記出湯管（８）からの高温水と前記中温水出湯口（３４）からの湯水とを任意の所定温度に混合する中温水混合弁（３０）と、この中温水混合弁（３０）で混合された湯と前記給水管（９）から分岐されたバイパス管（３８）からの低温水とを任意の給湯設定温度に混合して給湯させる給湯混合弁（３７）と、を備え、給湯出湯停止中に、給湯混合弁（３７）を所定の開度で待機させて、再出湯に備える貯湯式給湯装置（１００）において、前記高温水の温度を検出する高温水用温度センサ（６１）と、前記中温水の温度を検出する中温水用温度センサ（６２）と、前記低温水の給水温度を検出する給水温度センサ（５７）と、前記高温水、中温水、低温水の温度に基づいて給湯混合弁（３７）の待機開度を変更するように構成した給湯混合弁制御部（５６）と、を設け、前記給湯混合弁制御部（５６）は、給湯出湯停止中に、前記中温水混合弁（３０）の待機位置が変更されたかどうか検出し、この検出した待機位置（開度）に基づいて給湯混合弁（３７）の待機開度を変更するように構成したことを特徴とする。 The invention of the hot water storage type hot water supply device (100) according to claim 1 includes a hot water storage tank (2) having a water supply pipe (9) connected to the lower end and a hot water discharge pipe (8) connected to the upper end, and the hot water storage A heating means (3) for heating hot water in the tank (2) to a high temperature, and an intermediate position higher than the water supply pipe (9) of the hot water storage tank (2) and lower than the hot water discharge pipe (8). An intermediate hot water outlet (34), an intermediate hot water mixing valve (30) for mixing hot water from the outlet pipe (8) and hot water from the intermediate hot water outlet (34) to an arbitrary predetermined temperature; and A hot water mixing valve (37) that mixes hot water mixed by the intermediate temperature water mixing valve (30) and low temperature water from the bypass pipe (38) branched from the water supply pipe (9) at an arbitrary hot water supply set temperature to supply hot water. ), And the hot water supply mixing valve (37) is made to stand by at a predetermined opening while hot water supply hot water is stopped, In the hot water storage hot water supply device (100) provided for hot water, the temperature sensor (61) for high temperature water that detects the temperature of the high temperature water, the temperature sensor (62) for medium temperature water that detects the temperature of the medium temperature water, and the low temperature A feed water temperature sensor (57) for detecting the feed water temperature of the water, and a hot water mixing valve control configured to change the standby opening degree of the hot water mixing valve (37) based on the temperature of the high temperature water, medium temperature water, and low temperature water standby section (56), set only, said hot water supply mixing valve control unit (56) is in the hot water pouring is stopped, whether detected or standby position in said hot water mixing valve (30) is changed, that the detection The standby opening degree of the hot water supply mixing valve (37) is changed based on the position (opening degree) .

請求項２に係る発明は、給水管（９）が下端部に接続され、出湯管（８）が上端部に接続されている貯湯タンク（２）と、この貯湯タンク（２）内の湯水を高温に加熱する加熱手段（３）と、貯湯タンク（２）の前記給水管（９）よりも高くかつ前記出湯管（８）よりも低い中間位置に設けられた中温水出湯口（３４）と、前記出湯管（８）からの高温水と前記中温水出湯口（３４）からの湯水とを任意の所定温度に混合する中温水混合弁（３０）と、この中温水混合弁（３０）で混合された湯と前記給水管（９）から分岐されたバイパス管（３８）からの低温水とを任意の給湯設定温度に混合して給湯させる給湯混合弁（３７）と、を備え、給湯出湯停止中に、給湯混合弁（３７）を所定の開度で待機させて、再出湯に備える貯湯式給湯装置（１００）において、前記高温水の温度を検出する高温水用温度センサ（６１）と、前記中温水の温度を検出する中温水用温度センサ（６２）と、前記低温水の給水温度を検出する給水温度センサ（５７）と、前記高温水、中温水、低温水の温度に基づいて給湯混合弁（３７）の待機開度を変更するように構成した給湯混合弁制御部（５６）と、を設け、前記給湯混合弁制御部（５６）は、給湯出湯停止が所定時間以上経過した場合は、給水温度が変化したと判断し、給湯混合弁（３７）の待機開度を変更するように構成したことを特徴とする。 The invention according to claim 2 is directed to a hot water storage tank (2) having a water supply pipe (9) connected to the lower end and a hot water discharge pipe (8) connected to the upper end, and hot water in the hot water storage tank (2). A heating means (3) for heating to a high temperature, and a medium temperature hot water outlet (34) provided at an intermediate position higher than the water supply pipe (9) of the hot water storage tank (2) and lower than the hot water discharge pipe (8). An intermediate hot water mixing valve (30) for mixing hot water from the hot water outlet pipe (8) and hot water from the intermediate hot water outlet (34) to an arbitrary predetermined temperature, and this intermediate hot water mixing valve (30) A hot water mixing valve (37) for mixing hot water and low-temperature water from the bypass pipe (38) branched from the water supply pipe (9) at an arbitrary hot water supply set temperature to supply hot water; During stoppage, the hot water supply mixing valve (37) is made to stand by at a predetermined opening, and a hot water storage type hot water supply device provided for re-heating. In (100), a temperature sensor (61) for high temperature water that detects the temperature of the high temperature water, a temperature sensor (62) for medium temperature water that detects the temperature of the medium temperature water, and a feed water temperature of the low temperature water are detected. A hot-water supply temperature sensor (57), and a hot-water supply mixing valve controller (56) configured to change a standby opening degree of the hot-water supply mixing valve (37) based on the temperatures of the high-temperature water, medium-temperature water, and low-temperature water. setting only the hot water supply mixing valve control unit (56), when the hot water tapping stop has passed a predetermined time or more, it is determined that the water temperature is changed, to change the standby degree of opening of the hot water supply mixing valve (37) characterized in that the configuration was.

請求項３に係る発明は、請求項１または請求項２に記載の貯湯式給湯装置（１００）であって、給湯設定温度が中温水の温度より高い時、熱源温度を高温水の温度とし、給湯設定温度が中温水の温度より低い時、熱源温度を中温水の温度とし、前記熱源温度または低温水の給水温度が変化した時、給湯混合弁（３７）の待機開度を変更することを特徴とする。 The invention according to claim 3 is the hot water storage type hot water supply device (100) according to claim 1 or claim 2, wherein when the hot water supply set temperature is higher than the temperature of the intermediate temperature water, the heat source temperature is set as the temperature of the high temperature water, When the hot water supply set temperature is lower than the temperature of the medium temperature water, the heat source temperature is set as the temperature of the medium temperature water, and when the heat source temperature or the temperature of the low temperature water is changed, the standby opening degree of the hot water mixing valve (37) is changed. Features.

請求項４に係る発明は、請求項１または請求項２に記載の貯湯式給湯装置（１００）であって、前記貯湯タンク（２）への給水口から給湯混合弁（３７）の水側入口に第１逆止弁（６３）を設け、ふろ混合弁（４１）の水側入口に第２逆止弁（６４）を設けたことを特徴とする。 The invention according to claim 4 is the hot water storage type hot water supply device (100) according to claim 1 or 2 , wherein the water side inlet of the hot water supply mixing valve (37) from the water supply port to the hot water storage tank (2). 1 is provided with a first check valve (63), and a second check valve (64) is provided at the water side inlet of the bath mixing valve (41).

請求項５に係る発明は、給水管（９）が下端部に接続され、出湯管（８）が上端部に接続されている貯湯タンク（２）と、この貯湯タンク（２）内の湯水を高温に加熱する加熱手段（３）と、貯湯タンク（２）の前記給水管（９）よりも高くかつ前記出湯管（８）よりも低い中間位置に設けられた中温水出湯口（３４）と、前記出湯管（８）からの高温水と前記中温水出湯口（３４）からの湯水とを任意の所定温度に混合する中温水混合弁（３０）と、この中温水混合弁（３０）で混合された湯と前記給水管（９）から分岐されたバイパス管（３８）からの低温水とを任意の給湯設定温度に混合して給湯させる給湯混合弁（３７）と、を備え、給湯出湯停止中に、給湯混合弁（３７）を所定の開度で待機させて、再出湯に備える貯湯式給湯装置（１００）の給湯混合弁（３７）の待機開度制御方法において、前記高温水の温度を検出する高温水用温度センサ（６１）と、前記中温水の温度を検出する中温水用温度センサ（６２）と、前記低温水の給水温度を検出する給水温度センサ（５７）と、前記高温水、中温水、低温水の温度に基づいて給湯混合弁（３７）の待機開度を変更するように構成した給湯混合弁制御部（５６）とを設け、前記給湯混合弁制御部（５６）は、給湯出湯停止中に、前記中温水混合弁（３０）の待機位置が変更されたかどうか検出し、この検出した待機位置（開度）に基づいて給湯混合弁（３７）の待機開度を変更するように構成し、前記給湯混合弁制御部（５６）は、給湯出湯停止が所定時間以上経過した場合、給水温度が変化したと判断して給湯混合弁（３７）の待機開度を変更するように構成し、前記貯湯タンク（２）への給水口から給湯混合弁（３７）の水側入口に第１逆止弁（６３）を設け、ふろ混合弁（４１）の水側入口に第２逆止弁（６４）を設けた貯湯式給湯装置（１００）の給湯混合弁（３７）の給湯出湯停止中の待機開度制御方法は、タイマー（５８）が起動するステップＳ１と、前記高温水用温度センサ（６１）と、前記中温水用温度センサ（６２）と、前記給水温度センサ（５７）により、熱源温度と、給水温度とを検出するステップＳ２と、給湯制御部（５５）のタイマーと、前記高温水用温度センサ（６１）、中温水用温度センサ（６２）によって熱源温度を検出し、前記給水温度センサ（５７）によって給水温度の変化を監視して温度の変化を検出するステップＳ３と、前記給湯混合弁（３７）の待機開度を変更するステップＳ４と、前記中温水混合弁（３０）の待機開度を検出するステップＳ５と、前記中温水混合弁（３０）の待機開度が変更されたかを監視し、待機開度を変更したことを検出するステップＳ６と、前記給湯混合弁（３７）の待機開度を変更するステップＳ７と、給湯出湯停止から所定時間経過したかを監視し、給湯出湯停止から所定時間経過した場合のステップＳ８と、前記給湯混合弁（３７）の待機開度を変更するステップＳ９と、給湯出湯を開始したかを監視し、給湯出湯が開始したことにより、制御を終了するステップＳ１０と、を含むことを特徴とする。 According to the fifth aspect of the present invention, there is provided a hot water storage tank (2) having a water supply pipe (9) connected to the lower end and a hot water discharge pipe (8) connected to the upper end, and hot water in the hot water storage tank (2). A heating means (3) for heating to a high temperature, and a medium temperature hot water outlet (34) provided at an intermediate position higher than the water supply pipe (9) of the hot water storage tank (2) and lower than the hot water discharge pipe (8). An intermediate hot water mixing valve (30) for mixing hot water from the hot water outlet pipe (8) and hot water from the intermediate hot water outlet (34) to an arbitrary predetermined temperature, and this intermediate hot water mixing valve (30) A hot water mixing valve (37) for mixing hot water and low-temperature water from the bypass pipe (38) branched from the water supply pipe (9) at an arbitrary hot water supply set temperature to supply hot water; During stoppage, the hot water supply mixing valve (37) is made to stand by at a predetermined opening, and a hot water storage type hot water supply device provided for re-heating. In the standby opening degree control method of the hot water supply mixing valve (37) of (100), a temperature sensor for high temperature water (61) for detecting the temperature of the high temperature water, and a temperature sensor for medium temperature water for detecting the temperature of the medium temperature water ( 62), a feed water temperature sensor (57) for detecting a feed water temperature of the low temperature water, and a standby opening degree of the hot water mixing valve (37) based on the temperatures of the high temperature water, medium temperature water, and low temperature water. A hot water mixing valve control unit (56) configured, and the hot water mixing valve control unit (56) detects whether or not the standby position of the intermediate hot water mixing valve (30) has been changed during the hot water supply hot water stop, The hot water mixing valve control unit (56) is configured to change the standby opening degree of the hot water supply mixing valve (37) based on the detected standby position (opening degree). If the water supply temperature is changed, (37) is configured to change the standby opening, and a first check valve (63) is provided from the water supply port to the hot water storage tank (2) to the water-side inlet of the hot water supply mixing valve (37) to mix the bath. The standby opening degree control method during the hot water supply and hot water stop of the hot water supply mixing valve (37) of the hot water storage hot water supply device (100) provided with the second check valve (64) at the water side inlet of the valve (41) is a timer (58 ) Is started, and the step of detecting the heat source temperature and the feed water temperature by the high temperature water temperature sensor (61), the medium temperature water temperature sensor (62), and the feed water temperature sensor (57). The heat source temperature is detected by S2, the timer of the hot water supply control unit (55), the temperature sensor for high temperature water (61), and the temperature sensor for medium temperature water (62), and the change of the water supply temperature by the water supply temperature sensor (57). To detect temperature change by monitoring 3, Step S4 for changing the standby opening degree of the hot water mixing valve (37), Step S5 for detecting the standby opening degree of the intermediate hot water mixing valve (30), and standby state for the intermediate hot water mixing valve (30) Step S6 for monitoring whether the opening degree has been changed and detecting that the standby opening degree has been changed; Step S7 for changing the standby opening degree of the hot water supply mixing valve (37); In step S8 when a predetermined time has elapsed from the stop of hot water supply hot water, step S9 for changing the standby opening degree of the hot water supply mixing valve (37), and whether hot water supply hot water has started, Step S10 which ends control by having started is characterized by including.

請求項１に係る発明によれば、給湯出湯停止中に、給湯混合弁を開いた状態で待機し、再出湯に備える貯湯式給湯装置において、高温水の温度を検出する高温水用温度センサと、中温水の温度を検出する中温水用温度センサと、低温水の給水温度は給水温度センサと、高温水、中温水、低温水の温度に基づいて給湯混合弁の待機開度を変更するように構成した給湯混合弁制御部とを設けたことにより、貯湯タンク内の貯湯温水の熱量に応じて、貯湯タンク内の温水を中温水湯口、または、出湯管から出湯できるため、中温水を優先して使用しながら熱量不足も解消できる。また、このような木目細かな制御ができるので、オーバーシュートまたはアンダーシュートが発生することなく、出湯性能が低下しない貯湯式給湯装置の給湯混合弁の待機開度変更方法を提供することができる。
また、前記給湯混合弁制御部は、給湯出湯停止中に、前記中温水混合弁の待機位置が変更されたかどうか検出し、この検出した温度に基づいて給湯混合弁の待機開度を変更するように構成したことにより、貯湯タンク内の上層部にある高温水の出湯を調整し、中温水湯口から出湯できるため、オーバーシュートまたはアンダーシュートの発生が小さく、出湯性能が低下しない貯湯式給湯装置の提供ができる。 According to the first aspect of the present invention, in the hot water storage type hot water supply apparatus that waits with the hot water supply mixing valve open and stops the hot water supply hot water and is prepared for re-hot water, a temperature sensor for high temperature water that detects the temperature of the high temperature water; The temperature sensor for medium temperature water that detects the temperature of the medium temperature water, and the water temperature of the low temperature water supply water temperature sensor, the standby opening of the hot water mixing valve is changed based on the temperature of the high temperature water, medium temperature water, and low temperature water The hot water mixing valve control unit configured as above allows hot water in the hot water storage tank to be discharged from the hot water hot water tap or outlet pipe according to the amount of hot water in the hot water storage tank. Insufficiency can be solved while using. Further, since such fine control can be performed, it is possible to provide a method for changing the standby opening degree of the hot water mixing valve of the hot water storage hot water supply device without causing overshoot or undershoot and without deteriorating the hot water supply performance.
Further, the hot water mixing valve control unit detects whether or not the standby position of the intermediate temperature water mixing valve has been changed while hot water supply hot water is stopped, and changes the standby opening degree of the hot water mixing valve based on the detected temperature. Because it is possible to adjust the hot water discharge in the upper layer of the hot water storage tank and discharge from the hot water hot water tap, the occurrence of overshoot or undershoot is small, and the hot water storage type water heater does not deteriorate the hot water performance. Can be provided.

請求項２に係る発明によれば、給湯出湯停止中に、給湯混合弁を開いた状態で待機し、再出湯に備える貯湯式給湯装置において、高温水の温度を検出する高温水用温度センサと、中温水の温度を検出する中温水用温度センサと、低温水の給水温度は給水温度センサと、高温水、中温水、低温水の温度に基づいて給湯混合弁の待機開度を変更するように構成した給湯混合弁制御部とを設けたことにより、貯湯タンク内の貯湯温水の熱量に応じて、貯湯タンク内の温水を中温水湯口、または、出湯管から出湯できるため、中温水を優先して使用しながら熱量不足も解消できる。また、このような木目細かな制御ができるので、オーバーシュートまたはアンダーシュートが発生することなく、出湯性能が低下しない貯湯式給湯装置の給湯混合弁の待機開度変更方法を提供することができる。
また、前記給湯混合弁制御部は、給湯出湯停止が所定時間以上経過した場合は、給水温度が変化したと判断し、給湯混合弁の待機開度を変更するように構成したことにより、貯湯タンク内の貯湯熱量に応じて、給湯混合弁の待機開度を変えることができるため、オーバーシュートまたはアンダーシュートの発生が小さく、出湯性能が低下しない貯湯式給湯装置の提供ができる。 According to the invention which concerns on Claim 2, in the hot water storage type hot water supply apparatus which waits in the state which opened the hot-water supply mixing valve in the hot-water supply hot water stop, and prepares for re-hot water, the temperature sensor for high-temperature water which detects the temperature of high-temperature water; The temperature sensor for medium temperature water that detects the temperature of the medium temperature water, and the water temperature of the low temperature water supply water temperature sensor, the standby opening of the hot water mixing valve is changed based on the temperature of the high temperature water, medium temperature water, and low temperature water The hot water mixing valve control unit configured as above allows hot water in the hot water storage tank to be discharged from the hot water hot water tap or outlet pipe according to the amount of hot water in the hot water storage tank. Insufficiency can be solved while using. Further, since such fine control can be performed, it is possible to provide a method for changing the standby opening degree of the hot water mixing valve of the hot water storage hot water supply device without causing overshoot or undershoot and without deteriorating the hot water supply performance.
In addition, the hot water mixing valve control unit is configured to change the standby opening degree of the hot water mixing valve by determining that the hot water temperature has changed when the hot water hot water stoppage has elapsed for a predetermined time or longer. Since the standby opening degree of the hot water supply mixing valve can be changed according to the amount of hot water stored in the hot water storage valve, it is possible to provide a hot water storage type hot water supply apparatus in which the occurrence of overshoot or undershoot is small and the hot water discharge performance does not deteriorate.

請求項３に係る発明によれば、給湯混合弁制御部は、給湯設定温度が中温水の温度より高い時、熱源温度を高温水の温度とし、給湯設定温度が中温水の温度より低い時、熱源温度を中温水の温度とし、前記熱源温度または低温水の給水温度が変化した時、給湯混合弁（３７）の待機開度を変更することにより、木目細かく開度変更をするので、オーバーシュートまたはアンダーシュートの発生を小さくでき、出湯性能が低下しない貯湯式給湯装置と、その給湯混合弁の待機開度変更方法を提供することができる。 According to the invention of claim 3, when the hot water supply set temperature is higher than the temperature of the intermediate temperature water , the hot water supply mixing valve control unit sets the heat source temperature as the temperature of the high temperature water, and when the hot water supply set temperature is lower than the temperature of the intermediate temperature water, When the heat source temperature is the temperature of the medium temperature water and the heat source temperature or the feed water temperature of the low-temperature water changes, the opening degree is finely changed by changing the standby opening degree of the hot water supply mixing valve (37). Or generation | occurrence | production of an undershoot can be made small and the hot water storage hot-water supply apparatus with which hot-water supply performance does not fall and the standby opening degree change method of the hot-water supply mixing valve can be provided.

請求項４に係る発明によれば、貯湯タンクへの給水口から給湯混合弁の水側入口に第１逆止弁を設け、ふろ混合弁の水側入口に第２逆止弁を設けたことにより、これらの逆止弁を貯湯タンクの給水口から給湯混合弁方向への逆流を阻止し、ふろ混合弁方向への逆流を阻止するとともに、給湯設定温度＞中温水用温度センサの検出温度の場合は、貯湯タンクの最上部の出湯管から出湯し、給湯設定温度≦中温水用温度センサの検出温度の場合は、中温水出湯管から出湯するようになるので、ムダのない熱効率のよい給湯ができる。 According to the invention of claim 4 , the first check valve is provided from the water supply port to the hot water storage tank to the water side inlet of the hot water supply mixing valve, and the second check valve is provided to the water side inlet of the bath mixing valve. Therefore, these check valves prevent backflow from the hot water supply port of the hot water storage tank toward the hot water supply mixing valve, prevent backflow toward the hot water mixing valve, and the hot water set temperature> the detection temperature of the temperature sensor for medium hot water In the case of hot water, the hot water is discharged from the hot water discharge pipe at the uppermost part of the hot water storage tank, and if the set temperature of the hot water supply ≤ temperature detected by the temperature sensor for intermediate hot water, the hot water is discharged from the intermediate hot water hot water supply pipe. Can do.

請求項５に係る発明によれば、ステップＳ１〜ステップＳ１０による給湯混合弁の待機開度制御方法により、熱源温度または給水温度が変化したときであっても、木目細かく開度変更をするので、オーバーシュートまたはアンダーシュートの発生を小さくでき、出湯性能が低下しない貯湯式給湯装置と、その給湯混合弁の待機開度変更方法を提供することができる。 According to the invention which concerns on Claim 5 , even when the heat source temperature or the feed water temperature changes by the standby opening degree control method of the hot water supply mixing valve in steps S1 to S10, the opening degree is finely changed. It is possible to provide a hot water storage type hot water supply device that can reduce the occurrence of overshoot or undershoot and does not deteriorate the hot water discharge performance, and a method for changing the standby opening degree of the hot water supply mixing valve.

≪貯湯式給湯装置の構成≫
次に、図１、図３を参照して、本発明の実施形態を説明する。
図１は、本発明の貯湯式給湯装置を示す給湯回路図である。図１に示すように、貯湯式給湯装置１００は、貯湯タンク２内の貯湯温水を加熱手段である熱交換器１３で加熱するとともに、浴槽６の浴槽水を風呂循環ポンプ２７で風呂循環回路２６を循環させて、熱交換器１９で浴槽水を貯湯温水と熱交換することによって追い焚き運転する機能を備えた装置である。この貯湯式給湯装置１００は、例えば、時間帯別契約電力の電力単価が安価な深夜時間帯に貯湯温水を沸き上げて貯湯し、この貯湯した貯湯温水を給湯に用いるいわゆるエコキュート（自然冷媒ヒートポンプ式電気給湯機）から構成されている。 ≪Configuration of hot water storage type hot water supply system≫
Next, an embodiment of the present invention will be described with reference to FIGS.
FIG. 1 is a hot water supply circuit diagram showing a hot water storage type hot water supply apparatus of the present invention. As shown in FIG. 1, a hot water storage type hot water supply apparatus 100 heats hot water in a hot water storage tank 2 by a heat exchanger 13 that is a heating means, and bath water in the bathtub 6 is heated by a bath circulation pump 27 in a bath circulation circuit 26. Circulates and heat-exchanges the bathtub water with the hot water stored in the heat exchanger 19 to provide a reheating operation. This hot water storage type hot water supply device 100 is a so-called eco-cute (natural refrigerant heat pump type) that uses hot water stored in hot water to store hot water in the late-night time when the unit price of contracted electric power by time zone is low, and uses the stored hot water for hot water supply. Electric water heater).

貯湯式給湯装置１００の追い焚き運転は、熱交換器１９の２次（図中右）側に、浴槽６の浴槽水を循環可能にふろ往き管２４とふろ戻り管２５より構成されるふろ循環回路２６が接続され、ふろ戻り管２５途中に設けられたふろ循環ポンプ２７の作動により浴槽６の浴槽水が熱交換器１９に循環されて、１次側の高温水により加熱されて浴槽６内の浴槽水の保温あるいは追い焚きが行われる。ふろ温度センサ２８はふろ戻り管２５を循環する浴槽６の浴槽水の温度を検出する温度センサである。 The reheating operation of the hot water storage type hot water supply apparatus 100 is a bath circulation constituted by a bath pipe 24 and a bath return pipe 25 on the secondary (right side in the figure) side of the heat exchanger 19 so that the bath water of the bath 6 can be circulated. The circuit 26 is connected, and the bath water in the bathtub 6 is circulated to the heat exchanger 19 by the operation of the bath circulation pump 27 provided in the middle of the bath return pipe 25 and is heated by the high temperature water on the primary side. The bath water is kept warm or chased. The bath temperature sensor 28 is a temperature sensor that detects the temperature of the bath water in the bath 6 circulating in the bath return pipe 25.

追い焚きは、浴槽６のぬるま湯をポンプ２７にて熱交換器に送り、暖めた湯を浴槽６に戻して行われる。熱交換器１９は風呂の追い焚き／保温の熱源として、熱交往き管２０および給水管９に合流する熱交戻り管２１により貯湯タンク２と循環可能に接続されており、貯湯タンク２内の高温水を熱交換器１９に流入させて暖房回路あるいは風呂の追い焚き／保温回路等の２次側回路の温水を加熱するものである。 The reheating is performed by sending the warm water in the bathtub 6 to the heat exchanger with the pump 27 and returning the warm water to the bathtub 6. The heat exchanger 19 is connected to the hot water storage tank 2 so as to be circulated by a heat exchange return pipe 21 joined to the heat transfer pipe 20 and the water supply pipe 9 as a heat source for bathing / warming the bath. Hot water is allowed to flow into the heat exchanger 19 to heat the hot water in the secondary circuit such as a heating circuit or a bath reheating / warming circuit.

≪ヒートポンプユニットの構成≫
図１に示すように、加熱手段であるヒートポンプユニット３は、貯湯タンク１２の下層部の低温水を入水して沸かし、貯湯タンク２内の上層部に高温水を送るように循環させる装置であり、例えば、自然冷媒ヒートポンプから構成される。このヒートポンプユニット３は、圧縮機１２と凝縮器としての冷媒−水の熱交換器１３と電子膨張弁１４と強制空冷式の蒸発器１５で構成された加熱手段としてのヒートポンプ回路１６と、貯湯タンク２内の湯水を前記ヒーポン往き管１０およびヒーポン戻り管１１を介して冷媒−水熱交換器１３に循環させるヒーポン循環ポンプ１７と、それらの駆動を制御するヒーポン制御部１８とを備えており、ヒートポンプ回路１６内には冷媒としてＣＯ_２が用いられて超臨界ヒートポンプサイクルを構成している。ヒートポンプユニット３は、冷媒にＣＯ_２を用いているので、低温水を電熱ヒーターなしで約９０℃の高温まで沸き上げることが可能である。 ≪Heat pump unit configuration≫
As shown in FIG. 1, the heat pump unit 3 that is a heating means is a device that injects and cools the low temperature water in the lower layer of the hot water storage tank 12 and circulates the hot water to the upper layer in the hot water storage tank 2. For example, it is composed of a natural refrigerant heat pump. The heat pump unit 3 includes a compressor 12, a refrigerant-water heat exchanger 13 as a condenser, an electronic expansion valve 14, a forced air-cooled evaporator 15, a heat pump circuit 16 as a heating means, and a hot water storage tank. A heat pump circulating pump 17 that circulates the hot water in 2 to the refrigerant-water heat exchanger 13 via the heat pump forward pipe 10 and the heat pump return pipe 11, and a heat pump controller 18 that controls the driving of the heat pump. In the heat pump circuit 16, CO ₂ is used as a refrigerant to constitute a supercritical heat pump cycle. Since the heat pump unit 3 uses CO ₂ as a refrigerant, it is possible to boil low-temperature water to a high temperature of about 90 ° C. without an electric heater.

＜加熱手段の構成＞
加熱手段（以下、ヒートポンプユニットという）３である熱交換器１３は、貯湯タンク２内の下層部の低温水を加熱して高温水にするためのものである。この熱交換器１３は、冷媒と被加熱水たる貯湯タンク２内の湯水とが対向して流れる対向流方式の冷媒−水熱交換器が採用されている。 <Configuration of heating means>
The heat exchanger 13 which is a heating means (hereinafter referred to as a heat pump unit) 3 is for heating the low temperature water in the lower layer in the hot water storage tank 2 to high temperature water. The heat exchanger 13 employs a counter-flow type refrigerant-water heat exchanger in which the refrigerant and hot water in the hot water storage tank 2 as heated water face each other.

＜ヒートポンプ回路の構成＞
ヒートポンプ回路１６は、自然冷媒（例えば、二酸化炭素）を利用して、蒸発器１５で大気の熱を吸収し、さらに圧縮器１２で冷媒を圧縮して高温にし、その冷媒で熱交換器１３を通過する水を熱交換して加熱する臨界ヒートポンプサイクルを構成する。
つまり、このヒートポンプ回路１６は、冷媒の熱と回路を流れる湯水とを熱交換して高温水（約９０℃）にする熱交換器１３と、電子膨張弁１４と、空気から熱を吸収して冷媒に移す強制空冷式蒸発器から構成する蒸発器１５と、冷媒を圧縮して高温（約９０℃）にするための圧縮器２７と、それらの駆動を制御するヒートポンプ制御部１８から主に構成されている。 <Configuration of heat pump circuit>
The heat pump circuit 16 uses natural refrigerant (for example, carbon dioxide), absorbs atmospheric heat with the evaporator 15, further compresses the refrigerant with the compressor 12 to a high temperature, and uses the refrigerant to heat the heat exchanger 13. A critical heat pump cycle that heats the passing water through heat exchange is configured.
In other words, this heat pump circuit 16 absorbs heat from the heat exchanger 13, the electronic expansion valve 14, and the air that exchange heat between the heat of the refrigerant and hot water flowing through the circuit into high-temperature water (about 90 ° C.). Consists mainly of an evaporator 15 composed of a forced air-cooled evaporator transferred to the refrigerant, a compressor 27 for compressing the refrigerant to a high temperature (about 90 ° C.), and a heat pump control unit 18 for controlling the driving thereof. Has been.

＜ヒートポンプ制御部の構成＞
ヒートポンプ制御部１８は、ヒートポンプユニット3による沸き上げ運転の制御と、増し運転を開始および停止を制御する。このヒートポンプ制御部１８は、冷媒循環回路の加熱手段である熱交換器１３で熱交換するときに、冷媒が超臨界状態のまま凝縮されるため効率良く高温まで被加熱水を加熱する。このようにして、ヒートポンプ制御部１８が、被加熱水の加熱手段の入口温度と冷媒の出口温度との温度差が一定になるように膨張弁１４または圧縮器１２を制御することで、ＣＯＰ（エネルギー消費効率）が良好な状態で被加熱水を加熱できる。 <Configuration of heat pump control unit>
The heat pump control unit 18 controls the heating operation by the heat pump unit 3 and the start and stop of the additional operation. The heat pump controller 18 efficiently heats the water to be heated to a high temperature because the refrigerant is condensed in a supercritical state when heat is exchanged by the heat exchanger 13 that is a heating unit of the refrigerant circulation circuit. In this way, the heat pump control unit 18 controls the expansion valve 14 or the compressor 12 so that the temperature difference between the inlet temperature of the heating means of the water to be heated and the outlet temperature of the refrigerant becomes constant, whereby COP ( Heated water can be heated with good energy consumption efficiency.

≪貯湯タンクユニットの構成≫
図１に示すように、貯湯タンクユニット１は、貯湯タンク２の貯湯温水を利用して、流し台や洗面所に給湯したり、浴槽６に差し湯をしたり、湯張りをする装置である。この貯湯タンクユニット１は、水道水を取り込むための給水管９と、温水を一時的に貯湯する貯湯タンク２と、ふろの「保温運転」あるいは「追焚き運転」をするための熱交換器１９から主に構成されている。また、貯湯タンクユニット１には、給湯制御部５５と、給湯混合弁制御部５６が設けられている。 ≪Configuration of hot water storage tank unit≫
As shown in FIG. 1, the hot water storage tank unit 1 is a device that uses hot water stored in a hot water storage tank 2 to supply hot water to a sink or a washroom, to pour hot water into a bathtub 6, and to fill a hot water. The hot water storage tank unit 1 includes a water supply pipe 9 for taking in tap water, a hot water storage tank 2 for temporarily storing hot water, and a heat exchanger 19 for performing a “heat insulation operation” or a “reheating operation” of the bath. Consists mainly of. Further, the hot water storage tank unit 1 is provided with a hot water supply control unit 55 and a hot water supply mixing valve control unit 56.

図１に示すように、熱交換器１９のふろの「保温運転」あるいは「追焚き運転」について説明する。浴槽６への湯張り運転に引き続き、給湯制御部５５は一定時間毎にふろ循環ポンプ２７を駆動し、浴槽６内の湯温をふろ温度センサ２８により検出する。そして、ふろ温度センサ２８の検出する温度がふろ設定温度より所定値以下に低下していると、給湯制御部５５は熱交循環ポンプ２３およびふろ循環ポンプ２６を駆動開始し、高温水往き管２０から取り出した高温水を熱交換器１９に流入させ、２次側の浴槽水と熱交換させふろの「保温運転」あるいは「追焚き運転」を行う。そして、熱交換により温度低下した中温水が中温水戻り管２１を介して貯湯タンク２の下部に戻り、高温水と入れ替わる形で高温水と中温水の境界面を押し上げるようにして中温水が貯湯される。
なお、貯湯タンク２内には上部に高温水、中間部に中温水、下部に低温水が貯められているが、その温度差が２０℃程度あれば比重差が発生し、温度境界層を形成して比重の軽い高温水が上部に、中間の中間水が中間部に、比重の重い低温水が下部に位置するので、互いに混じり合うことはない。 As shown in FIG. 1, “warming operation” or “reheating operation” of the bath of the heat exchanger 19 will be described. Subsequent to the hot water filling operation to the bathtub 6, the hot water supply control unit 55 drives the bath circulation pump 27 at regular intervals and detects the hot water temperature in the bath 6 by the bath temperature sensor 28. When the temperature detected by the bath temperature sensor 28 is lower than the bath setting temperature by a predetermined value or less, the hot water supply control unit 55 starts driving the heat exchange circulation pump 23 and the bath circulation pump 26, and the hot water discharge pipe 20. The high-temperature water taken out from the water flows into the heat exchanger 19 and exchanges heat with the secondary-side bath water to perform the “warming operation” or “retreat operation” of the bath. Then, the intermediate temperature water whose temperature has decreased due to the heat exchange returns to the lower part of the hot water storage tank 2 via the intermediate temperature water return pipe 21 and is replaced with the high temperature water to push up the boundary surface between the high temperature water and the intermediate temperature water. Is done.
In the hot water storage tank 2, high temperature water is stored in the upper part, medium temperature water is stored in the middle part, and low temperature water is stored in the lower part. If the temperature difference is about 20 ° C, a specific gravity difference occurs and a temperature boundary layer is formed. The high-temperature water having a low specific gravity is located at the upper part, the intermediate intermediate water is located at the intermediate part, and the low-temperature water having a high specific gravity is located at the lower part, so that they do not mix with each other.

次に、本発明の給湯混合弁３７の待機開度変更方法について説明する。
図１に示すように、給湯リモコン５またはふろリモコン７でユーザーが設定した給湯設定温度＞中温水用温度センサの検出温度の場合は、給湯栓４を開くと、貯湯タンク２の最上部の出湯管から給湯される。つまり、貯湯タンク２の下の給水管９から冷温水が給水されて貯湯タンク２内に流れ込むと、貯湯タンク２の上層部に貯められた高温水（約９０℃）は、その冷温水に押し出されて貯湯タンクの最上部の出湯管８から中温水混合弁３０を介して給湯混合弁３７に流入し、他方の給水管９から冷温水が第１バイパス管３８から給湯混合弁３７に流入してミキシングされ、指定された温度の高温水で出湯する。これは、ふろ設定温度（第２給湯設定温度）も同様である。 Next, a method for changing the standby opening degree of the hot water mixing valve 37 of the present invention will be described.
As shown in FIG. 1, when the hot water supply set temperature set by the user with the hot water remote controller 5 or the bath remote controller 7> the temperature detected by the temperature sensor for intermediate hot water, when the hot water tap 4 is opened, the hot water at the top of the hot water storage tank 2 is opened. Hot water is supplied from the pipe. That is, when cold / hot water is supplied from the water supply pipe 9 below the hot water storage tank 2 and flows into the hot water storage tank 2, the hot water (about 90 ° C.) stored in the upper layer of the hot water storage tank 2 is pushed out to the cold / hot water. The hot water storage pipe 37 flows into the hot water supply mixing valve 37 through the middle hot water mixing valve 30 from the uppermost hot water storage tank 8, and cold / hot water flows into the hot water supply mixing valve 37 from the first bypass pipe 38. The water is mixed with hot water at the specified temperature. The same applies to the bath set temperature (second hot water supply set temperature).

給湯リモコン５またはふろリモコン７でユーザーが設定した給湯設定温度≦中温水用温度センサの検出温度の場合は、従来、給湯混合弁３７において、第１出湯管３１からの高温水と給水管９から分岐された第１バイパス管３８からの低温水を混合して中温水を生成していたが、直接、中温水出湯管３４から出湯することにより、高温水の消費量を押さえ、出湯のムダのない熱効率のよい給湯ができる。 In the case of the hot water supply set temperature set by the user with the hot water remote controller 5 or the bath remote controller 7 ≦ the detected temperature of the temperature sensor for intermediate hot water, conventionally, in the hot water mixing valve 37, the hot water from the first hot water discharge pipe 31 and the water supply pipe 9 are used. The low temperature water from the branched first bypass pipe 38 was mixed to generate intermediate temperature water, but by directly discharging the hot water from the intermediate temperature water discharge pipe 34, the consumption of high temperature water was suppressed, and waste water wasted. There is no heat efficient hot water supply.

図２は、本発明の給湯混合弁制御部を示すブロック図である。図２に示すように、給湯混合弁制御部５６は、予め所定の湯の温度を設定するメモリで構成された湯温度設定メモリ８１と、この設定された所定の湯温度と貯湯タンク内に配置された高温水用温度センサ６１と、中温水用温度センサ６２と、給水管９に配置された給水温度センサ５７で計測された温度とを比較する演算部８２と、この演算結果に基づいて給湯混合弁３７の開度、中温水混合弁３０の開度、ふろ混合弁４１の開度を制御する制御部８３とを備えて構成されている。
これらの温度センサ６１、６２は、温度サーミスタが使用され、より正確な貯湯タンク２の温度を検出できるように着脱自在に構成されているが、この他の温度検出器を使用してもよい。 FIG. 2 is a block diagram showing the hot water mixing valve control unit of the present invention. As shown in FIG. 2, the hot water mixing valve control unit 56 is arranged in a hot water temperature setting memory 81 configured with a memory for setting a predetermined hot water temperature in advance, and in the set predetermined hot water temperature and the hot water storage tank. The high-temperature water temperature sensor 61, the medium-temperature water temperature sensor 62, and the operation unit 82 that compares the temperature measured by the water supply temperature sensor 57 disposed in the water supply pipe 9, and hot water supply based on the calculation result And a control unit 83 that controls the opening degree of the mixing valve 37, the opening degree of the intermediate hot water mixing valve 30, and the opening degree of the bath mixing valve 41.
These temperature sensors 61 and 62 use temperature thermistors and are configured to be detachable so that the temperature of the hot water storage tank 2 can be detected more accurately. However, other temperature detectors may be used.

図３は、本発明に係る給湯混合弁の待機開度変更方法を示すフローチャートである。図１、２を参照しながら給湯混合弁の待機開度変更方法を説明する。
これらは、給湯出湯停止中に給湯混合弁３７を開いた状態で待機し、再出湯に備える仕様である。
図３に示すように、給湯栓４、または、湯張り弁４６（図１参照）が閉栓されて、給湯出湯停止すると、給湯制御部５５は、流量カウンタ５９の信号に基づいて給湯栓４からの出湯停止を検知する。そして、給湯制御部５５は、再出湯に備えて給湯混合弁３７を、出湯停止時の開度で待機させる。したがって、スタートは「給湯出湯停止」であり、タイマーが起動する（ステップＳ１）。
このとき、給水管９から冷水の水道水（井戸水も含む）が貯湯タンク２内に給水され、貯湯タンク２の貯湯温水の温度が低下すると共に、残湯量がしだいに減少する。この貯湯タンク２の熱源温度は、高温水用温度センサ６１、中温水用温度センサ６２によって検出され、給水温度は給水温度センサ５７により検出されて、その検出信号が給湯混合弁制御部５６に送信される（ステップＳ２）。 FIG. 3 is a flowchart showing a method for changing the standby opening degree of the hot water supply mixing valve according to the present invention. A method of changing the standby opening degree of the hot water supply mixing valve will be described with reference to FIGS.
These are specifications that wait in a state where the hot water supply mixing valve 37 is opened while hot water supply hot water is stopped, and prepare for re-hot water supply.
As shown in FIG. 3, when the hot-water tap 4 or the hot-water filling valve 46 (see FIG. 1) is closed and the hot-water supply hot water supply stops, the hot-water supply control unit 55 starts from the hot-water tap 4 based on the signal of the flow rate counter 59. Detects a hot water outage. And the hot-water supply control part 55 makes the hot-water supply mixing valve 37 stand by with the opening degree at the time of a hot-water supply stop in preparation for re-heating. Therefore, the start is “stop hot water supply and hot water”, and the timer is started (step S1).
At this time, cold water tap water (including well water) is supplied into the hot water storage tank 2 from the water supply pipe 9, and the temperature of the hot water stored in the hot water storage tank 2 decreases, and the amount of remaining hot water gradually decreases. The temperature of the heat source in the hot water storage tank 2 is detected by the temperature sensor 61 for high temperature water and the temperature sensor 62 for medium temperature water, the temperature of the feed water is detected by the feed water temperature sensor 57, and the detection signal is transmitted to the hot water mixing valve controller 56. (Step S2).

そして、給湯制御部５５によって、給湯出湯停止中、高温水用温度センサ６１、中温水用温度センサ６２によって熱源温度が変化したかを検出、または、給水温度センサ５７によって給水温度が変化したか（ステップＳ３のＮｏ）を監視し、温度の変化を検出する（ステップＳ３のＹｅｓ）と、給湯混合弁制御部５５によって、給湯混合弁３７の待機開度を変更する（ステップＳ４）。
つまり、給湯混合弁制御部（５６）は、給湯設定温度が中温水の温度より高い時、熱源温度を高温水の温度とし、給湯設定温度が中温水の温度より低い時、熱源温度を中温水の温度とし、前記熱源温度または低温水の給水温度が変化した時、給湯混合弁（３７）の待機開度を変更する。
つぎに、中温水混合弁３０の待機開度を検出する（ステップＳ５）。
そして、中温水混合弁３０の待機開度が変更されたか（ステップＳ６のＮｏ）を監視し、待機開度を変更したことを検出する（ステップＳ６のＹｅｓ）と、給湯混合弁制御部５５によって、給湯混合弁３７の待機開度を変更する（ステップＳ７）。
そして、給湯出湯停止から所定時間経過したか（ステップＳ８のＮｏ）を監視し、給湯出湯停止から所定時間経過した場合（ステップＳ８のＹｅｓ）、給湯混合弁３７の待機開度を変更する（ステップＳ９）。
そして、最後に、給湯出湯を開始したか（ステップＳ１０のＮｏ）を監視し、給湯出湯が開始した場合（ステップＳ１０のＹｅｓ）、そして、フィードバック（ＦＢ）制御は終了する。 Then, the hot water supply control unit 55 detects whether the heat source temperature has been changed by the hot water temperature sensor 61 and the intermediate hot water temperature sensor 62 while the hot water supply hot water is stopped, or has the hot water temperature sensor 57 changed the supply water temperature ( If the temperature change is detected (Yes in step S3), the hot water mixing valve control unit 55 changes the standby opening degree of the hot water mixing valve 37 (step S4).
That is, the hot water supply mixing valve control unit (56) sets the heat source temperature to the temperature of the high temperature water when the hot water supply set temperature is higher than the temperature of the intermediate temperature water, and sets the heat source temperature to the When the heat source temperature or the low-temperature water supply temperature changes, the standby opening degree of the hot water supply mixing valve (37) is changed.
Next, the standby opening degree of the intermediate temperature water mixing valve 30 is detected (step S5).
Then, monitoring whether the standby opening degree of the intermediate temperature water mixing valve 30 has been changed (No in step S6) and detecting that the standby opening degree has been changed (Yes in step S6), the hot water supply mixing valve control unit 55 The standby opening degree of the hot water supply mixing valve 37 is changed (step S7).
Then, it is monitored whether a predetermined time has passed since the hot water supply hot water stop (No in step S8), and when the predetermined time has passed since the hot water supply hot water stop (Yes in step S8), the standby opening degree of the hot water supply mixing valve 37 is changed (step). S9).
Finally, it is monitored whether hot water supply hot water has started (No in step S10), and when hot water supply hot water starts (Yes in step S10), the feedback (FB) control ends.

つまり、放熱、ふろ出湯、ふろ追炊きにより熱源温度が下がってきた場合や、熱源温度または給水温度が変化したときであっても、変化量に見合うだけ、中温水混合弁３０と給湯混合弁（３７）の待機開度を変え、高温水と水道水の混合比を変えることができるため、オーバーシュートまたはアンダーシュートの発生が小さく抑えられ、出湯性能が低下しないようにできる。 In other words, even when the heat source temperature has fallen due to heat dissipation, bathing hot water, bath cooking, or when the heat source temperature or feed water temperature has changed, the medium hot water mixing valve 30 and the hot water mixing valve ( 37) Since the standby opening degree can be changed and the mixing ratio of high-temperature water and tap water can be changed, the occurrence of overshoot or undershoot can be kept small, and the hot water performance can be prevented from deteriorating.

沸き増しにより熱源温度が上がってきた場合も、変化量に見合うだけ、中温水混合弁３０と給湯混合弁（３７）の待機開度を変え、高温水と水道水の混合比を変えることができるため、オーバーシュートまたはアンダーシュートの発生が小さく抑えられ、出湯性能が低下しないようにできる。 Even when the heat source temperature rises due to the increase in boiling, the standby opening degree of the intermediate temperature water mixing valve 30 and the hot water supply mixing valve (37) can be changed and the mixing ratio of high temperature water and tap water can be changed as much as the amount of change. Therefore, the occurrence of overshoot or undershoot can be kept small, and the hot water performance can be prevented from deteriorating.

給水温度が著しく変化した場合も、変化量に見合うだけ、中温水混合弁３０と給湯混合弁（３７）の待機開度を変え、高温水と水道水の混合比を変えることができるため、オーバーシュートまたはアンダーシュートの発生が小さく抑えられ、出湯性能が低下しないようにできる。 Even when the feed water temperature changes remarkably, the standby opening degree of the intermediate temperature water mixing valve 30 and the hot water supply mixing valve (37) can be changed and the mixing ratio of high temperature water and tap water can be changed as much as the amount of change. Occurrence of chute or undershoot is suppressed to a small level so that the hot water discharge performance does not deteriorate.

なお、ステップＳ３の所定時間とは、例えば、出張や小旅行等により家を空ける場合の２〜３日をいう。２〜３日以上給湯出湯停止状態が続くと、放熱によって温度が低下する。したがって、ここでの所定時間は、１日単位の数日間とするが、その他の時間に設定しても構わない。
なお、本発明は、前記した実施形態に限定されるものではなく、その技術的思想の範囲内で種々の改造および変更が可能であり、本発明はこれら改造および変更された発明にも及ぶことは勿論である。
例えば、本発明の実施形態に係る貯湯式給湯装置１００において、ふろの追い焚き用に熱交換器１９を設けたが、貯湯タンク２内の上層部に熱交換器を設け、直接風呂循環回路を設けた給湯回路図としても構わない。また、加熱手段であるヒートポンプユニット３の代わりに、電熱ヒーターやガスバーナー、灯油バーナー等であっても構わない。 In addition, the predetermined time of step S3 means 2-3 days when leaving a house by a business trip, a short trip, etc., for example. If the hot water supply / hot water outage state continues for 2 to 3 days or more, the temperature decreases due to heat dissipation. Accordingly, the predetermined time here is set to several days per day, but may be set to other times.
The present invention is not limited to the above-described embodiment, and various modifications and changes can be made within the scope of the technical idea, and the present invention extends to these modifications and changes. Of course.
For example, in the hot water storage type hot water supply apparatus 100 according to the embodiment of the present invention, the heat exchanger 19 is provided for replenishing the bath, but the heat exchanger is provided in the upper layer portion in the hot water storage tank 2, and the direct bath circulation circuit is provided. It may be a hot water supply circuit diagram provided. Further, instead of the heat pump unit 3 which is a heating means, an electric heater, a gas burner, a kerosene burner or the like may be used.

本発明に係る貯湯式給湯装置を示す給湯回路図である。It is a hot water supply circuit diagram showing a hot water storage type hot water supply apparatus according to the present invention. 本発明の給湯混合弁制御部を示すブロック図である。It is a block diagram which shows the hot water mixing valve control part of this invention. 本発明に係る給湯混合弁の待機開度変更方法を示すフローチャートである。It is a flowchart which shows the standby opening degree change method of the hot water supply mixing valve which concerns on this invention. 従来の貯湯式給湯装置を示す給湯回路図である。It is a hot water supply circuit diagram showing a conventional hot water storage type hot water supply apparatus.

Explanation of symbols

１貯湯タンクユニット
２貯湯タンク
３加熱手段（ヒートポンプユニット）
８出湯管
９給水管
１０ヒーポン往き管（ヒーポン循環回路）
１１ヒーポン戻り管（ヒーポン循環回路）
１６ヒートポンプ回路
２９中温水出湯管
３０中温水混合弁
３３出湯口切換弁
３４中温水出湯口
３７給湯混合弁
３８第１バイパス管
４１ふろ混合弁
５５給湯制御部
５６給湯混合弁制御部
５７給水温度センサ
５８タイマー
５９タイマー
６１高温水用温度センサ
６２中温水用温度センサ
６３第１逆止弁
６４第２逆止弁
８１湯温度設定メモリ
８２演算部
８３制御部
１００貯湯式給湯装置 1 Hot water storage tank unit 2 Hot water storage tank 3 Heating means (heat pump unit)
8 Hot water pipe 9 Water supply pipe 10 Heaton outgoing pipe (Heaton circulation circuit)
11 Heaton return pipe (heaton circulation circuit)
16 Heat pump circuit 29 Medium temperature hot water outlet pipe 30 Medium temperature water mixing valve 33 Hot water outlet switching valve 34 Medium temperature water hot water outlet 37 Hot water mixing valve 38 First bypass pipe 41 Bath mixing valve 55 Hot water supply controller 56 Hot water supply valve controller 57 Hot water temperature sensor 58 Timer 59 Timer 61 Temperature sensor 62 for high temperature water Temperature sensor 63 for medium temperature water 63 First check valve 64 Second check valve 81 Hot water temperature setting memory 82 Calculation unit 83 Control unit 100 Hot water storage type hot water supply device

Claims

A hot water storage tank (2) having a water supply pipe (9) connected to the lower end and a hot water discharge pipe (8) connected to the upper end, and heating means (3) for heating hot water in the hot water storage tank (2) to a high temperature ), An intermediate hot water outlet (34) provided at an intermediate position higher than the water supply pipe (9) of the hot water storage tank (2) and lower than the hot water discharge pipe (8), and the hot water discharge pipe (8) A hot water mixed valve (30) for mixing hot water from the hot water outlet and the hot water from the hot water outlet (34) to an arbitrary predetermined temperature, hot water mixed by the hot water mixing valve (30), and the water supply pipe A hot water mixing valve (37) that mixes low temperature water from the bypass pipe (38) branched from (9) with an arbitrary hot water supply set temperature to supply hot water, and
In the hot water storage hot water supply device (100), the hot water supply mixing valve (37) waits at a predetermined opening degree during hot water supply hot water stop,
A high-temperature water temperature sensor (61) for detecting the temperature of the high-temperature water;
A medium temperature water temperature sensor (62) for detecting the temperature of the medium temperature water;
A feed water temperature sensor (57) for detecting a feed water temperature of the low-temperature water;
A hot water mixing valve controller (56) configured to change the standby opening degree of the hot water mixing valve (37) based on the temperature of the high temperature water, medium temperature water, and low temperature water;
The setting,
The hot water mixing valve control unit (56) detects whether or not the standby position of the intermediate hot water mixing valve (30) has been changed while hot water supply hot water is stopped, and mixes hot water based on the detected standby position (opening). A hot water storage type hot water supply device (100) characterized in that the standby opening degree of the valve (37) is changed .

A hot water storage tank (2) having a water supply pipe (9) connected to the lower end and a hot water discharge pipe (8) connected to the upper end, and heating means (3) for heating hot water in the hot water storage tank (2) to a high temperature ), An intermediate hot water outlet (34) provided at an intermediate position higher than the water supply pipe (9) of the hot water storage tank (2) and lower than the hot water discharge pipe (8), and the hot water discharge pipe (8) A hot water mixed valve (30) for mixing hot water from the hot water outlet and the hot water from the hot water outlet (34) to an arbitrary predetermined temperature, hot water mixed by the hot water mixing valve (30), and the water supply pipe A hot water mixing valve (37) that mixes low temperature water from the bypass pipe (38) branched from (9) with an arbitrary hot water supply set temperature to supply hot water, and
In the hot water storage hot water supply device (100), the hot water supply mixing valve (37) waits at a predetermined opening degree during hot water supply hot water stop,
A high-temperature water temperature sensor (61) for detecting the temperature of the high-temperature water;
A medium temperature water temperature sensor (62) for detecting the temperature of the medium temperature water;
A feed water temperature sensor (57) for detecting a feed water temperature of the low-temperature water;
A hot water mixing valve controller (56) configured to change the standby opening degree of the hot water mixing valve (37) based on the temperature of the high temperature water, medium temperature water, and low temperature water;
The setting,
The hot-water supply mixing valve control unit (56) is configured to change the standby opening degree of the hot-water supply mixing valve (37), judging that the hot-water supply temperature has changed when the hot-water supply hot-water supply stop has passed for a predetermined time or more. A hot water storage type hot water supply device (100).

The hot water mixing valve control unit (56)
When the hot water supply set temperature is higher than the temperature of the medium temperature water, the heat source temperature is the temperature of the high temperature water,
When the hot water supply set temperature is lower than the temperature of the medium temperature water, the heat source temperature is the temperature of the medium temperature water,
The hot water storage type hot water supply device (100) according to claim 1 or 2 , wherein the standby opening degree of the hot water supply mixing valve (37) is changed when the heat source temperature or the low temperature water supply temperature changes.

A first check valve (63) is provided from the water supply port to the hot water storage tank (2) to the water side inlet of the hot water supply mixing valve (37), and a second check valve ( 64) The hot water storage type hot water supply device (100) according to claim 1 or 2 , characterized in that a hot water storage device (100) is provided.

A hot water storage tank (2) having a water supply pipe (9) connected to the lower end and a hot water discharge pipe (8) connected to the upper end, and heating means (3) for heating hot water in the hot water storage tank (2) to a high temperature ), An intermediate hot water outlet (34) provided at an intermediate position higher than the water supply pipe (9) of the hot water storage tank (2) and lower than the hot water discharge pipe (8), and the hot water discharge pipe (8) A hot water mixed valve (30) for mixing hot water from the hot water outlet and the hot water from the hot water outlet (34) to an arbitrary predetermined temperature, hot water mixed by the hot water mixing valve (30), and the water supply pipe A hot water mixing valve (37) that mixes low temperature water from the bypass pipe (38) branched from (9) with an arbitrary hot water supply set temperature to supply hot water, and
In the method for controlling the standby opening of the hot water mixing valve (37) of the hot water storage type hot water supply device (100), which waits the hot water supply mixing valve (37) at a predetermined opening degree while the hot water supply hot water supply is stopped.
A temperature sensor (61) for high temperature water that detects the temperature of the high temperature water, a temperature sensor (62) for medium temperature water that detects the temperature of the medium temperature water, and a water supply temperature sensor (57) that detects the temperature of the low temperature water. ) And a hot water mixing valve controller (56) configured to change a standby opening degree of the hot water mixing valve (37) based on the temperature of the high temperature water, medium temperature water, and low temperature water, and the hot water mixing valve The control unit (56) detects whether or not the standby position of the intermediate hot water mixing valve (30) has been changed while hot water supply and hot water is stopped, and based on the detected standby position (opening), the hot water supply mixing valve (37) The hot water supply mixing valve control unit (56) determines that the temperature of the hot water supply has changed when the hot water supply / hot water stop has been stopped for a predetermined time or longer, and the hot water supply mixing valve (37) It is configured to change the standby opening, and the hot water storage tank ( The first check valve (63) is provided at the water-side inlet of the hot-water supply mixing valve (37) from the water supply port to), and the second check valve (64) is provided at the water-side inlet of the bath mixing valve (41). The standby opening degree control method during the hot water supply / outflow stop of the hot water supply mixing valve (37) of the hot water storage hot water supply device (100) is as follows:
Step S1 in which the timer (58) starts,
A step S2 of detecting a heat source temperature and a feed water temperature by the high temperature water temperature sensor (61), the medium temperature water temperature sensor (62), and the feed water temperature sensor (57);
The heat source temperature is detected by the timer of the hot water supply control section (55), the temperature sensor for high temperature water (61), and the temperature sensor for medium temperature water (62), and the change of the water temperature is monitored by the water temperature sensor (57). Step S3 for detecting a change in temperature,
Step S4 for changing the standby opening degree of the hot water mixing valve (37);
Detecting a standby opening degree of the intermediate temperature water mixing valve (30);
Monitoring whether or not the standby opening of the intermediate temperature water mixing valve (30) has been changed, and detecting that the standby opening has been changed;
Step S7 for changing the standby opening degree of the hot water supply mixing valve (37);
Monitoring whether a predetermined time has passed since the hot water supply hot water stop, step S8 when a predetermined time has passed since the hot water supply hot water stop,
Step S9 for changing the standby opening degree of the hot water supply mixing valve (37);
Monitoring whether hot-water supply hot water has started, and ending the control when hot-water supply hot water has started;
A standby opening degree control method for the hot-water supply mixing valve (37), comprising: