JP6060025B2

JP6060025B2 - Bath water heater

Info

Publication number: JP6060025B2
Application number: JP2013077665A
Authority: JP
Inventors: 和也佐山; 本間　誠; 誠本間; 誠森田; 信人諸橋; 靖阿久津; 義彦長澤
Original assignee: Corona Corp
Current assignee: Corona Corp
Priority date: 2013-04-03
Filing date: 2013-04-03
Publication date: 2017-01-11
Anticipated expiration: 2033-04-03
Also published as: JP2014202393A

Description

本発明は、浴水の水位が目標水位を下回ると自動たし湯を行うふろ給湯装置に関するものである。 The present invention relates to a bath hot water supply apparatus that performs automatic hot water when the level of bath water falls below a target water level.

従来より、この種のふろ給湯装置は、特許文献１のように、浴槽とふろ熱交換器とを浴水が循環可能に接続するふろ循環回路と、前記ふろ循環回路に設けられ浴水を循環させるふろ循環ポンプと、前記ふろ循環回路途中に設けられて前記浴槽内の水位を監視する水位センサと、前記ふろ循環回路に接続されて前記浴槽に所望の温度の湯水を供給する湯はり回路と、前記水位センサが監視する浴水の水位が目標水位を下回ると、一定量または目標水位まで前記湯はり回路と前記ふろ循環回路を介して設定温度の湯を供給するふろ補水運転を行う制御手段とを備えたものが一般的に知られている。 Conventionally, this kind of bath water heater is provided with a bath circulation circuit that connects bath water to a bath heat exchanger so that the bath water can circulate as in Patent Document 1, and is provided in the bath circulation circuit to circulate bath water. A bath circulation pump, a water level sensor provided in the bath circulation circuit for monitoring the water level in the bath, and a hot water circuit connected to the bath circulation circuit for supplying hot water of a desired temperature to the bath Control means for performing bath replenishment operation for supplying hot water at a set temperature via the hot water circuit and the water circulation circuit to a certain amount or the target water level when the water level of the bath water monitored by the water level sensor falls below the target water level What is provided with is generally known.

特開２０１０−１６９２７１号公報（段落００４９）JP 2010-169271 A (paragraph 0049)

ところが、この従来のものでは、浴槽に６０℃程度の高温の湯を供給する高温さし湯を行うと、水位センサがこの高温の湯に晒されて温度上昇し、水位センサの温度上昇による出力電圧の変動により、実際の水位よりも低い水位を誤検出してしまうことがあった。 However, in this conventional type, when hot water is supplied to the bathtub to supply hot water of about 60 ° C., the water level sensor is exposed to the hot water and the temperature rises, and the output due to the temperature rise of the water level sensor. Due to voltage fluctuation, a water level lower than the actual water level may be erroneously detected.

そして、実際の水位よりも低い水位を誤検出したことによって目標水位を下回ったと誤判断されると、自動的にふろ補水運転が行われて不要な湯水が浴槽に供給されて、浴水の水位が目標水位よりも上昇し、場合によっては湯が溢れる恐れがあるものであった。 If it is erroneously detected that the water level is lower than the actual water level, the bath water replenishment operation is automatically performed and unnecessary hot water is supplied to the bathtub, and the bath water level is Was higher than the target water level, and in some cases hot water could overflow.

本発明は、上記課題を解決するため、浴槽とふろ熱交換器とを浴水が循環可能に接続するふろ循環回路と、前記ふろ循環回路に設けられ浴水を循環させるふろ循環ポンプと、前記ふろ循環回路途中に設けられて前記浴槽内の水位を監視するふろ水位センサと、前記ふろ循環回路に接続されて前記浴槽に所望の温度の湯水を供給する湯はり回路と、前記ふろ水位センサが監視する浴水の水位が目標水位を下回ると、所定量または目標水位まで前記湯はり回路と前記ふろ循環回路を介して設定温度の湯を供給するふろ補水運転を行う制御手段とを備えたふろ給湯装置において、前記制御手段は、前記湯はり回路と前記ふろ循環回路を介して前記浴槽に高温の湯を供給する高温さし湯が開始されると前記ふろ水位センサによる水位監視を中断し、高温さし湯終了後に、前記ふろ循環ポンプを一時的に駆動して前記ふろ循環回路内の高温さし湯の湯を浴水に置換してから前記ふろ水位センサの温度が浴水の温度に馴染むのに必要な一定時間が経過したら、前記ふろ水位センサによる水位監視を再開するようにし、前記ふろ水位センサの温度が浴水の温度に馴染むのに必要な一定時間は、前記高温さし湯の温度が高いほど長くなるようにした。 In order to solve the above problems, the present invention provides a bath circulation circuit for connecting bath water to a bath heat exchanger so that the bath water can circulate, a bath circulation pump provided in the bath circulation circuit for circulating bath water, A bath water level sensor provided in the middle of the bath circulation circuit for monitoring the water level in the bathtub, a hot water circuit connected to the bath circulation circuit for supplying hot water of a desired temperature to the bath, and the bath water level sensor A bath provided with control means for performing bath replenishment operation for supplying hot water at a set temperature through the bath circulating circuit and the bath circulating circuit to a predetermined amount or the target water level when the water level to be monitored falls below the target water level. In the hot water supply apparatus, the control means interrupts the water level monitoring by the bath water level sensor when hot water for supplying hot water to the bathtub is started via the hot water circuit and the bath circulation circuit, High After the bath is finished, the bath circulation pump is temporarily driven to replace the hot bath water in the bath circuit with bath water, and then the bath water level sensor adjusts to the bath water temperature. When a certain amount of time required for the water has passed, the water level monitoring by the bath water level sensor is resumed , and for a certain time necessary for the bath water level sensor to adjust to the bath water temperature, The longer the temperature, the longer .

本発明によれば、高温さし湯時の水位センサの温度特性によって水位を低く誤検出してしまう状況では水位監視が中断され、高温さし湯後にふろ循環回路内の湯水を浴水に置換した後、水位センサの温度が浴水の温度に馴染むのに必要な一定時間が経過して水位を低く誤検出してしまう恐れがなくなったタイミングで水位監視が再開されるため、不要なふろ補水運転が確実に防止できる。 According to the present invention, the water level monitoring is interrupted in a situation where the water level is erroneously detected low due to the temperature characteristics of the water level sensor during high temperature hot water, and the hot water in the bath circulation circuit is replaced with bath water after the high temperature hot water. After that, the water level monitoring is resumed at the timing when the water level sensor is no longer misdetected after a certain time required for the water level sensor to adjust to the bath water temperature. Driving can be reliably prevented.

本発明の一実施形態のふろ給湯装置の概略構成図1 is a schematic configuration diagram of a bath water heater according to an embodiment of the present invention. 同一実施形態の作動を説明するタイムチャートTime chart explaining the operation of the same embodiment

次に、本発明の一実施形態のヒートポンプ貯湯式ふろ給湯装置を図面に基づいて説明する。 Next, a heat pump hot water storage hot water supply apparatus according to an embodiment of the present invention will be described with reference to the drawings.

１は湯水を貯湯するステンレス製の貯湯タンク、２は貯湯タンク１底部に市水を給水する給水管、３は貯湯タンク１上部から出湯する出湯管、４は給水管２から分岐された給水バイパス管、５は出湯管３からの湯水と給水バイパス管４からの水とを給湯設定温度になるように混合する給湯混合弁、６は給湯混合弁５で混合された湯が流通する給湯管、７は給湯管６からの湯を給湯する給湯栓である。 1 is a stainless steel hot water storage tank for storing hot water, 2 is a water supply pipe for supplying city water to the bottom of the hot water storage tank 1, 3 is a hot water discharge pipe for discharging hot water from the upper part of the hot water storage tank 1, and 4 is a water supply bypass branched from the water supply pipe 2 A hot water mixing valve for mixing hot water from the hot water discharge pipe 3 and water from the water supply bypass pipe 4 so as to reach a hot water supply set temperature, 6 is a hot water supply pipe through which hot water mixed by the hot water mixing valve 5 flows, A hot water tap 7 supplies hot water from the hot water supply pipe 6.

８は出湯管３からの湯水と給水バイパス管４からの水とをふろ設定温度になるように混合するふろ混合弁、９はふろ混合弁８で混合された湯が流通して浴槽に湯はりするための湯はり回路、１０は湯はり回路９を開閉する湯はり開閉弁である。 8 is a bath mixing valve that mixes hot water from the outlet hot water pipe 3 and water from the feed water bypass pipe 4 so as to reach the set temperature. 9 is hot water mixed by the bath mixing valve 8 and flows into the bathtub. A hot water beam circuit 10 is used to open and close the hot water circuit 9.

１１は給湯管６途中に設けられ給湯温度を検出する給湯温度センサ、１２は給湯管６途中に設けられ給湯流量を検出する給湯流量センサ、１３は湯はり回路９途中に設けられ湯はり温度を検出する湯はり温度センサ、１４は湯はり回路９途中に設けられ湯はり流量を検出する湯はり流量センサである。 11 is a hot water supply temperature sensor that is provided in the middle of the hot water supply pipe 6 to detect the hot water supply temperature, 12 is a hot water supply flow rate sensor that is provided in the middle of the hot water supply pipe 6 to detect the flow rate of hot water supply, and 13 is provided in the middle of the hot water beam circuit 9. A hot water beam temperature sensor to be detected, and 14 is a hot water beam flow rate sensor which is provided in the middle of the hot water beam circuit 9 and detects the hot water flow rate.

１５は浴槽、１６は貯湯タンク１内の上部に設けられ貯湯タンク１内の湯の熱で浴水を加熱するためのふろ熱交換器、１７は浴槽１５とふろ熱交換器１６とを浴水が循環可能に接続するふろ循環回路、１８はふろ循環回路１７途中に設けられ浴水を循環させるふろ循環ポンプ、１９はふろ熱交換器１８をバイパスしてふろ循環回路１７を接続するふろバイパス管、２０はふろバイパス管１９とふろ循環回路１７の接続点に設けられ、浴水をふろ熱交換器１６側を循環させるか、ふろバイパス管１９側を循環させるかを切り換えるふろ三方弁である。ここで、ふろ熱交換器１６はステンレス管を螺旋状に巻回した構成としている。 15 is a bathtub, 16 is a bath heat exchanger provided in the upper part of the hot water storage tank 1 for heating the bath water with the heat of the hot water in the hot water storage tank 1, and 17 is a bath water for bathing the bath 15 and the bath heat exchanger 16. A bath circulation circuit 18 is connected to the bath circulation circuit 17, 18 is a bath circulation pump for circulating bath water provided in the middle of the bath circulation circuit 17, and 19 is a bath bypass pipe that bypasses the bath heat exchanger 18 and connects the bath circulation circuit 17. , 20 is a bath three-way valve which is provided at a connection point between the bath bypass pipe 19 and the bath circulation circuit 17 and switches between bath water circulating through the bath heat exchanger 16 side or the bath bypass pipe 19 side. Here, the bath heat exchanger 16 has a configuration in which a stainless steel tube is spirally wound.

２１はふろ循環回路１７途中に設けられ浴槽１５からふろ熱交換器１６へ流れる浴水の温度を検出するふろ温度センサ、２２はふろ循環回路１７途中に設けられ浴槽１５内の水位を検出するふろ水位センサである。 21 is a bath temperature sensor for detecting the temperature of the bath water flowing from the bath 15 to the bath heat exchanger 16 and 22 is a bath for detecting the water level in the bath 15. It is a water level sensor.

２３は貯湯タンク１の側面の上下方向に複数設けられ貯湯温度を検出する貯湯温度センサ、２４は給水管２に設けられ市水の給水圧を一定の圧力に減圧する減圧弁、２５は貯湯タンク１内の過圧を逃がす過圧逃がし弁である。 23 is a hot water storage temperature sensor that is provided in the vertical direction of the side surface of the hot water storage tank 1 to detect the hot water storage temperature, 24 is a pressure reducing valve that is provided in the water supply pipe 2 and reduces the water supply water pressure to a constant pressure, and 25 is a hot water storage tank. 1 is an overpressure relief valve for releasing overpressure in 1.

２６は貯湯タンク１下部の湯水を外部のヒートポンプ式加熱手段２８へ導出するヒーポン往き管、２７はヒートポンプ式加熱手段２７を通過した湯水を貯湯タンク１上部へ導入するヒーポン戻り管である。 Reference numeral 26 denotes a heat pump forward pipe for leading the hot water in the lower part of the hot water storage tank 1 to the external heat pump type heating means 28, and reference numeral 27 denotes a heat pump return pipe for introducing the hot water passed through the heat pump type heating means 27 into the upper part of the hot water storage tank 1.

２８は貯湯タンク１の湯水を加熱するヒートポンプ式加熱手段で、冷媒を圧縮する圧縮機２９と、水側にヒーポン往き管２６とヒーポン戻り管２７とが接続され冷媒と水とを熱交換する冷媒水熱交換器３０と、冷媒の圧力を減圧する減圧器３１と、液冷媒を蒸発させる蒸発器３２と、蒸発器３２に熱源となる外気を供給する送風手段３３と、冷媒水熱交換器３０の水側にヒーポン往き管２６からの湯水を供給する加熱循環ポンプ３４と、冷媒水熱交換器３０へ流入する水の温度を検出する入水温度センサ３５、冷媒水熱交換器３０で加熱された湯の温度を検出する沸き上げ温度センサ３６とを備え、蒸発器３０で吸熱した冷媒を圧縮機２９で圧縮して冷媒水熱交換器３０を介して水を加熱するようにしている。このヒートポンプ式加熱手段２８には冷媒として二酸化炭素冷媒が用いられ、高圧側が超臨界状態となることにより水を９０℃の高温まで加熱することができるものである。 28 is a heat pump type heating means for heating the hot water in the hot water storage tank 1, a refrigerant 29 for compressing the refrigerant, and a heat pump forward pipe 26 and a heat pump return pipe 27 connected to the water side to exchange heat between the refrigerant and water. A water heat exchanger 30, a decompressor 31 for reducing the pressure of the refrigerant, an evaporator 32 for evaporating the liquid refrigerant, a blowing means 33 for supplying outside air as a heat source to the evaporator 32, and the refrigerant water heat exchanger 30 The heat circulating pump 34 for supplying hot water from the heat pump forward pipe 26 to the water side of the water, the incoming water temperature sensor 35 for detecting the temperature of the water flowing into the refrigerant water heat exchanger 30, and the refrigerant water heat exchanger 30 A boiling temperature sensor 36 that detects the temperature of the hot water is provided, and the refrigerant that has absorbed heat by the evaporator 30 is compressed by the compressor 29 to heat the water through the refrigerant water heat exchanger 30. Carbon dioxide refrigerant is used as the refrigerant in the heat pump heating means 28, and water can be heated to a high temperature of 90 ° C. when the high pressure side is in a supercritical state.

３７は台所近傍等に設けられるリモートコントローラで、給湯装置に関する各種の情報（給湯設定温度、ふろ設定温度、タンク残湯量、給湯機の作動状態、日時等）を表示するドットマトリクス液晶型の表示部３８と、給湯温度の設定とふろ温度の設定等を行う十字キー３９と、ふろ自動運転を行わせるふろ自動キー４０と、浴槽１５への高温さし湯運転を行わせる高温さし湯キー４１と、給湯機の作動状態を表示部３８に表示させたり、各操作キーの操作に応じた情報を表示部３８に表示させるよう制御するリモコン制御手段４２とを備えている。 Reference numeral 37 denotes a remote controller provided in the vicinity of the kitchen, etc., which is a dot matrix liquid crystal display unit that displays various types of information related to the hot water supply device (hot water set temperature, bath set temperature, amount of remaining hot water in the tank, operating state of the water heater, date and time). 38, a cross key 39 for setting a hot water supply temperature, a bath temperature, and the like, a bath automatic key 40 for performing bath automatic operation, and a hot water key 41 for performing hot bath operation to the bathtub 15 Remote control means 42 for controlling the operation state of the water heater to be displayed on the display unit 38 and to display information corresponding to the operation of each operation key on the display unit 38.

４３は、給湯温度センサ１１、給湯流量センサ１２、湯はり温度センサ１３、湯はり流量センサ１４、ふろ温度センサ２１、ふろ水位センサ２２、貯湯温度センサ２３の検出値が入力され、給湯混合弁５、ふろ混合弁８、湯はり開閉弁１０、ふろ循環ポンプ１８、ふろ三方弁２０の作動を制御すると共に、リモートコントローラ３７およびヒートポンプ式加熱手段２８とと通信可能に接続された貯湯側制御手段である。この貯湯側制御手段４３は、予め給湯機の作動を制御するためのプログラムが記憶されていると共に、演算、比較、記憶機能、カレンダー時計機能を有しているものである。 Reference numeral 43 denotes a hot water supply temperature sensor 11, a hot water flow rate sensor 12, a hot water temperature sensor 13, a hot water flow rate sensor 14, a bath temperature sensor 21, a bath water level sensor 22, and a hot water storage temperature sensor 23. In addition to controlling the operation of the bath mixing valve 8, the hot water on-off valve 10, the bath circulation pump 18, and the bath three-way valve 20, the hot water storage side control means is connected to the remote controller 37 and the heat pump heating means 28 in a communicable manner. is there. The hot water storage side control means 43 stores a program for controlling the operation of the hot water heater in advance and has a calculation, comparison, storage function, and calendar clock function.

４４は、入水温度センサ３５、沸き上げ温度センサ３６の検出値が入力され、、圧縮機２９、減圧器３１、送風手段３３、加熱循環ポンプ３４の作動を制御すると共に、貯湯側制御手段４３と通信可能に接続された加熱側制御手段である。この加熱側制御手段４３は、予めヒートポンプ式加熱手段２８の作動を制御するためのプログラムが記憶されているものである。 44, the detection values of the incoming water temperature sensor 35 and the boiling temperature sensor 36 are input to control the operation of the compressor 29, the decompressor 31, the blower means 33, the heating circulation pump 34, and the hot water storage side control means 43. It is the heating side control means connected so that communication was possible. The heating-side control means 43 stores a program for controlling the operation of the heat pump heating means 28 in advance.

＜沸き上げ運転＞
電力料金単価の安価な所定時間帯（深夜時間帯）の開始時刻になると、貯湯側制御手段４３はそれまでの給湯負荷量に見合う湯量を沸き上げ開始するべく、加熱側制御手段４４に対し、給湯負荷量に見合う沸き上げ目標温度と沸き上げ開始の指示を送信し、加熱側制御手段４４は圧縮機２９と減圧器３１と送風手段３３と加熱循環ポンプ３４を駆動開始して、貯湯タンク１下部から取り出した湯水を冷媒水熱交換器３０で沸き上げ目標温度まで加熱して貯湯タンク１上部へ戻し、貯湯タンク１上部から沸き上げ設定温度の湯を積層状に貯湯し、貯湯側制御手段４３は最下部の貯湯温度センサ２３が所定の沸き上げ終了判定温度を検出するか、所定時間帯の終了時刻に到達すると、加熱側制御手段４４に沸き上げの停止を指示し、加熱側制御手段４４は圧縮機２９と減圧器３１と送風手段３３と加熱循環ポンプ３４を駆動停止して沸き上げ運転を終了する。 <Boiling operation>
When the start time of a predetermined time zone (midnight time zone) at which the power rate unit price is inexpensive is reached, the hot water storage side control means 43 instructs the heating side control means 44 to start boiling up the amount of hot water corresponding to the hot water supply load amount so far. A boiling target temperature corresponding to the hot water supply load and an instruction to start boiling are transmitted, and the heating side control means 44 starts driving the compressor 29, the decompressor 31, the air blowing means 33, and the heating circulation pump 34, and the hot water storage tank 1 The hot water taken out from the lower part is heated to the boiling target temperature by the refrigerant water heat exchanger 30 and returned to the upper part of the hot water storage tank 1, hot water at the set temperature is heated from the upper part of the hot water storage tank 1, and the hot water storage side control means When the bottom hot water storage temperature sensor 23 detects a predetermined boiling end determination temperature or reaches the end time of a predetermined time zone, 43 instructs the heating side control means 44 to stop the boiling, 44 terminates the heating operation stops driving the compressor 29 pressure reducer 31 and the blowing means 33 and the heating circulation pump 34.

＜給湯＞
給湯栓７が開かれると、貯湯タンク１の底部に給水管２から市水が流入すると共に貯湯タンク１の頂部から出湯管３を介して高温の湯が出湯し、給湯混合弁５で給水バイパス管４からの水と混合されて給湯管６を通過する。そして、給湯流量センサ１２が最低作動水量以上を検出すると、貯湯側制御手段４３は、給湯温度センサ１１が検出する温度が給湯設定温度と一致するように給湯混合弁５の弁開度をフィードバック制御して、給湯設定温度の給湯を行う。そして、給湯栓７が閉じられる等によって、給湯流量センサ１２が最低作動水量未満を検出すると、貯湯側制御手段４３は、給湯混合弁５の弁開度のフィードバック制御を停止して給湯停止するようにしている。 <Hot water supply>
When the hot-water tap 7 is opened, city water flows into the bottom of the hot water storage tank 1 from the water supply pipe 2 and hot water is discharged from the top of the hot water storage tank 1 through the hot water discharge pipe 3. It is mixed with water from the pipe 4 and passes through the hot water supply pipe 6. When the hot water flow rate sensor 12 detects a minimum working water amount or more, the hot water storage side control means 43 performs feedback control on the valve opening degree of the hot water mixing valve 5 so that the temperature detected by the hot water temperature sensor 11 coincides with the set hot water temperature. Then, hot water supply at the hot water supply set temperature is performed. When the hot water supply flow rate sensor 12 detects that the amount of operating water is less than the minimum operating water amount, for example, when the hot water tap 7 is closed, the hot water storage side control means 43 stops the hot water supply by stopping the feedback control of the valve opening degree of the hot water supply mixing valve 5. I have to.

＜沸き増し運転＞
次に、深夜時間帯以外の時間帯において、多量に給湯されるなどして貯湯側制御手段４３が貯湯温度センサ２３の検出温度に基づき貯湯タンク１内の貯湯量が少なくなったことを検出すると、貯湯側制御手段４３は、加熱側制御手段４４に対し、沸き上げ目標温度と沸き増し開始の指示を送信し、加熱側制御手段４４は圧縮機２９と減圧器３１と送風手段３３と加熱循環ポンプ３４を駆動開始して、貯湯タンク１下部から取り出した湯水を冷媒水熱交換器３０で沸き上げ目標温度まで加熱して貯湯タンク１上部へ戻し、それまで貯湯されていた湯の上部に沸き上げ目標温度の湯を積層状に貯湯し、貯湯側制御手段４３は沸き増しの開始から一定時間が経過すると、加熱側制御手段４４に沸き増しの停止を指示し、加熱側制御手段４４は圧縮機２９と減圧器３１と送風手段３３と加熱循環ポンプ３４を駆動停止して沸き増し運転を終了する。 <Increased operation>
Next, when the hot water storage side control means 43 detects that the amount of hot water stored in the hot water storage tank 1 has decreased based on the temperature detected by the hot water storage temperature sensor 23, such as when a large amount of hot water is supplied in a time zone other than the midnight time zone. The hot water storage side control means 43 transmits a boiling target temperature and an instruction to start boiling to the heating side control means 44, and the heating side control means 44 includes the compressor 29, the decompressor 31, the blower means 33, and the heating circulation. The pump 34 is started to drive, the hot water taken out from the lower part of the hot water storage tank 1 is heated up to the target temperature by the refrigerant water heat exchanger 30 and returned to the upper part of the hot water storage tank 1 and boiled at the upper part of the hot water that has been stored so far. The hot water at the target temperature to be raised is stored in a laminated form, and when the hot water storage side control means 43 has passed a certain period of time from the start of boiling, the heating side control means 44 instructs the heating side control means 44 to stop boiling, and the heating side control means 44 compresses. Machine 9 and decompressor 31 and the blowing means 33. The heating circulation pump 34 ends the reheating operation by driving stop.

＜ふろ自動運転＞
次に、ふろ自動運転について説明する。リモートコントローラ３７のふろ自動キー４０が操作されると、貯湯側制御手段４３は、湯はり開閉弁１０を開弁し、湯はり温度センサ１３が検出する温度がふろ設定温度と一致するようにふろ混合弁８の弁開度をフィードバック制御して、所望のふろ設定温度の湯はり運転を開始する。 <Automatic bathing>
Next, automatic bathing operation will be described. When the automatic bath key 40 of the remote controller 37 is operated, the hot water storage side control means 43 opens the hot water on / off valve 10 so that the temperature detected by the hot water temperature sensor 13 matches the bath temperature. The valve opening degree of the mixing valve 8 is feedback-controlled, and the hot water operation at a desired bath set temperature is started.

そして、貯湯側制御手段４３は、湯はり流量センサ１４で検出するふろ流量の積算値がふろ設定湯量となると、湯はり開閉弁１０を閉弁して湯はり運転を停止し、予め定められたふろ自動時間だけふろ保温運転およびふろ補水運転を行う。 Then, when the accumulated value of the bath flow rate detected by the hot water flow rate sensor 14 reaches the set hot water amount, the hot water storage side control means 43 closes the hot water on / off valve 10 and stops the hot water operation, which is predetermined. The bath warming operation and bath replenishment operation are performed only during the bath automatic time.

＜ふろ保温運転＞
ふろの保温運転では、一定時間毎にふろ三方弁２０をバイパス側にしたままでふろ循環ポンプ１８を駆動してふろ温度センサ２１で浴水の温度を確認し、ふろ設定温度より低くなっていることを検知すると、ふろ三方弁２０をふろ熱交換器１６側へ切り換えて、浴水をふろ熱交換器１６で加熱する。そして、ふろ温度センサ２１で浴水の温度がふろ設定温度より上昇したことを確認すると、ふろ三方弁２０をバイパス側に戻すと共にふろ循環ポンプ１８の駆動を停止するようにして、予め定められたふろ自動時間の間同様の動作を繰り返し、浴水をふろ設定温度に保つようにしている。 <Bath insulation operation>
In the bath warming operation, the bath circulation pump 18 is driven while the bath three-way valve 20 is set to the bypass side every predetermined time, and the bath temperature sensor 21 checks the bath water temperature, which is lower than the bath set temperature. When this is detected, the bath three-way valve 20 is switched to the bath heat exchanger 16 side and the bath water is heated by the bath heat exchanger 16. When the bath temperature sensor 21 confirms that the temperature of the bath water has risen from the bath set temperature, the bath three-way valve 20 is returned to the bypass side and the driving of the bath circulating pump 18 is stopped. The same operation is repeated during the bath automatic time to keep the bath water at the bath set temperature.

＜ふろ補水運転＞
ふろ補水運転では、貯湯側制御手段４３は、湯はり運転終了時の浴槽１５内の水位をふろ水位センサ２２の検出値に基づいて目標水位として記憶し、ふろ自動運転中は常時ふろ水位センサ２２で浴水の水位を監視し、浴水の水位が記憶した目標水位から一定値以上低下すると、湯はり開閉弁１０を開弁して、湯はり温度センサ１３が検出する温度がふろ設定温度と一致するようにふろ混合弁８の弁開度をフィードバック制御して、所望のふろ設定温度の湯を元の目標水位までの所定量またはふろ水位センサ２２で目標水位を検出するまで供給するようにし、予め定められたふろ自動時間の間同様の動作を繰り返し、浴水を所定水位に保つようにしている。 <Bath replenishment operation>
In the bath refilling operation, the hot water storage side control means 43 stores the water level in the bathtub 15 at the end of the hot water operation as a target water level based on the detected value of the bath water level sensor 22, and constantly during the bath automatic operation. The water level of the bath water is monitored, and when the water level of the bath water falls below a predetermined value from the stored target water level, the hot water on / off valve 10 is opened and the temperature detected by the hot water temperature sensor 13 is equal to the set temperature. The valve opening of the bath mixing valve 8 is feedback-controlled so as to match, and hot water having a desired bath set temperature is supplied until a predetermined amount up to the original target water level or until the target water level is detected by the bath water level sensor 22. The same operation is repeated during a predetermined automatic bath time so that the bath water is kept at a predetermined water level.

＜高温さし湯運転＞
次に、高温さし湯運転について、図２のタイムチャートに基づいて説明する。
リモートコントローラ３７の高温さし湯キー４０が操作されると（時刻ｔ１）、貯湯側制御手段４３は、ふろ三方弁２０をバイパス側にしたままで湯はり開閉弁１０を開き、湯はり温度センサ１３が検出する温度が予め定められた高温さし湯温度（ここでは６０℃）となるようにふろ混合弁８の弁開度をフィードバック制御して、高温さし湯運転を開始する。このとき、ふろ水位センサ２２の水位監視は一時的に中断する。 <High temperature hot water operation>
Next, the high temperature hot water operation will be described based on the time chart of FIG.
When the high-temperature hot water key 40 of the remote controller 37 is operated (time t1), the hot water storage side control means 43 opens the hot water on / off valve 10 while keeping the bath three-way valve 20 on the bypass side, and the hot water temperature sensor. The valve opening of the bath mixing valve 8 is feedback-controlled so that the temperature detected by 13 becomes a predetermined high temperature hot water temperature (60 ° C. in this case), and the high temperature hot water operation is started. At this time, the water level monitoring of the bath water level sensor 22 is temporarily interrupted.

湯はり回路９から流出する高温の湯は、ふろ循環回路１７の往き戻り両管を通過して浴槽１５へ供給され、制御手段４３は、予め定められた一定量を高温さし湯したことを湯はり流量センサ１４で検出すると（時刻ｔ２）、湯はり開閉弁１０を閉弁して高温さし湯運転を終了する。 The hot water flowing out from the hot water circuit 9 is supplied to the bathtub 15 through both the return and return pipes of the bath circulation circuit 17, and the control means 43 determines that a predetermined amount of hot water has been heated. When detected by the hot water flow rate sensor 14 (time t2), the hot water on-off valve 10 is closed to end the hot water hot water operation.

そして、貯湯側制御手段４３は、時刻ｔ２からわずかに遅れた時刻ｔ３において（時刻ｔ２と時刻ｔ３は同一時刻でも可）、ふろ三方弁２０をバイパス側にしたままでふろ循環ポンプ１８を駆動し、ふろ循環回路１７内に残留する高温さし湯による高温の湯を浴槽１５内の浴水と置換し、以後のふろ動作に伴う予期しない高温の湯の供給を防止すると共に、高温の湯を全て浴槽１５内に供給しきることによってエネルギーの無駄を抑制する。 The hot water storage side control means 43 drives the bath circulating pump 18 at the time t3 slightly delayed from the time t2 (the time t2 and the time t3 can be the same time) while the bath three-way valve 20 remains on the bypass side. The hot hot water remaining in the bath circulation circuit 17 is replaced with the hot water in the bathtub 15 to prevent the supply of unexpected hot water accompanying the subsequent bathing operation and The waste of energy is suppressed by supplying all into the bathtub 15.

ふろ循環ポンプ１８を予め定められた一定時間駆動したら（時刻ｔ４）、貯湯側制御手段４３は、ふろ循環ポンプ１８の駆動を停止すると共に、ふろ水位センサ２２の温度が浴水の温度に馴染むのに必要な一定時間Ｔのカウントを開始する。この一定時間Ｔのカウント中に、高温さし湯によって温度上昇したふろ水位センサ２２の温度が、ふろ循環回路１７内の浴水によって温度低下することとなる。 When the bath circulating pump 18 is driven for a predetermined time (time t4), the hot water storage side control means 43 stops driving the bath circulating pump 18 and the temperature of the bath water level sensor 22 adjusts to the bath water temperature. The counting of a certain time T necessary for the above is started. During the counting of the fixed time T, the temperature of the bath water level sensor 22 that has risen due to the hot water is lowered by the bath water in the bath circulation circuit 17.

そして、ふろ水位センサ２２の温度が浴水の温度に馴染むのに必要な一定時間Ｔのカウントが終了すると（時刻ｔ５）、貯湯側制御手段４３は、ふろ水位センサ２２の水位開始を再開する。 When the count of the predetermined time T necessary for the temperature of the bath water level sensor 22 to adjust to the bath water temperature ends (time t5), the hot water storage side control means 43 resumes the water level start of the bath water level sensor 22.

このようにして、高温さし湯時のふろ水位センサ２２の温度特性によって水位を低く誤検出してしまう状況では水位監視が中断され、高温さし湯後にふろ循環回路１７内の湯水を浴水に置換した後、ふろ水位センサ２２の温度が浴水の温度に馴染むのに必要な一定時間Ｔが経過して水位を低く誤検出してしまう恐れがなくなったタイミング（時刻ｔ５）で水位監視が再開されるため、不要なふろ補水運転が確実に防止できる。 Thus, in the situation where the water level is erroneously detected low due to the temperature characteristics of the bath water level sensor 22 at the time of the hot water, the water level monitoring is interrupted, and the hot water in the bath circuit 17 is bathed after the hot water. After the replacement, the water level monitoring is performed at a timing (time t5) at which a certain time T necessary for the temperature of the bath water level sensor 22 to adjust to the temperature of the bath water elapses and there is no possibility of false detection of the water level. Since it is resumed, unnecessary water replenishment operation can be surely prevented.

また、ふろ循環ポンプ１８の駆動は、ふろ循環回路１７内の高温の湯の置換に必要な時間だけ行うようにしているため、ふろ水位センサ２２の温度が浴水の温度に馴染ませるのに用いる消費電力を最小に抑えることができる。 Further, since the bath circulation pump 18 is driven only for a time required for replacement of hot water in the bath circulation circuit 17, it is used to adjust the temperature of the bath water level sensor 22 to the bath water temperature. Power consumption can be minimized.

ここで、ふろ水位センサ２２の温度が浴水の温度に馴染むのに必要な一定時間Ｔは、主に高温さし湯の温度に依存するため、高温さし湯の温度が上記の６０℃ではなく、それよりも高い８０℃に設定変更された場合は、これに合わせて一定時間Ｔを予め定められた長い時間Ｔ’とすることが好ましい。 Here, since the fixed time T required for the temperature of the bath water level sensor 22 to adjust to the temperature of the bath water mainly depends on the temperature of the hot water, the temperature of the hot water is 60 ° C. However, when the setting is changed to 80 ° C., which is higher than that, it is preferable to set the predetermined time T to a predetermined long time T ′ accordingly.

なお、本発明は上記の一実施形態に限定されるものではなく、発明の要旨を変更しない範囲で改変可能なものであり、ヒートポンプ貯湯式ではなく、公知の石油やガス燃焼による瞬間式のふろ給湯装置や電気温水器にも利用可能なものである。 The present invention is not limited to the above-described embodiment, and can be modified without changing the gist of the invention. It is not a heat pump hot water storage type but a known oil or gas combustion instantaneous bath. It can also be used for water heaters and electric water heaters.

また、ふろ水位センサ２２の温度が浴水の温度に馴染むのに必要な一定時間Ｔのカウント開始を、ふろ循環ポンプ１８の駆動停止時としているが、これはふろ循環ポンプ１８の駆動停止の時点がふろ循環ポンプ１８の駆動開始からふろ循環回路１７内の高温の湯の置換に必要な時間が経過した時点に一致しているためであり、このふろ循環ポンプ１８の駆動停止が上記置換に必要な時間以上になる場合は、ふろ循環ポンプ１８の駆動開始からふろ循環回路１７内の高温の湯の置換に必要な時間が経過した時点からふろ水位センサ２２の温度が浴水の温度に馴染むのに必要な一定時間Ｔのカウントを開始するようにしてもよいものである。 In addition, the count start of a certain time T necessary for the temperature of the bath water level sensor 22 to become familiar with the temperature of the bath water is set to the time when the bath circulating pump 18 is stopped. This is the time when the bath circulating pump 18 stops driving. This is because the time required for replacement of the hot water in the bath circulation circuit 17 has elapsed since the start of the driving of the bath circulation pump 18, and the driving stop of the bath circulation pump 18 is necessary for the replacement. If the time is longer than the required time, the temperature of the bath water level sensor 22 adjusts to the temperature of the bath water from the time when the hot water in the bath circulating circuit 17 has been replaced after the bath circulation pump 18 starts to be driven. It is also possible to start counting a certain time T necessary for the above.

９湯はり回路
１５浴槽
１６ふろ熱交換器
１７ふろ循環回路
１８ふろ循環ポンプ
２２ふろ水位センサ
４３貯湯側制御手段（制御手段） 9 Hot water circuit 15 Bath 16 Bath heat exchanger 17 Bath circulation circuit 18 Bath circulation pump 22 Bath water level sensor 43 Hot water storage side control means (control means)

Claims

浴槽とふろ熱交換器とを浴水が循環可能に接続するふろ循環回路と、前記ふろ循環回路に設けられ浴水を循環させるふろ循環ポンプと、前記ふろ循環回路途中に設けられて前記浴槽内の水位を監視するふろ水位センサと、前記ふろ循環回路に接続されて前記浴槽に所望の温度の湯水を供給する湯はり回路と、前記ふろ水位センサが監視する浴水の水位が目標水位を下回ると、所定量または目標水位まで前記湯はり回路と前記ふろ循環回路を介して設定温度の湯を供給するふろ補水運転を行う制御手段とを備えたふろ給湯装置において、前記制御手段は、前記湯はり回路と前記ふろ循環回路を介して前記浴槽に高温の湯を供給する高温さし湯が開始されると前記ふろ水位センサによる水位監視を中断し、高温さし湯終了後に、前記ふろ循環ポンプを一時的に駆動して前記ふろ循環回路内の高温さし湯の湯を浴水に置換してから前記ふろ水位センサの温度が浴水の温度に馴染むのに必要な一定時間が経過したら、前記ふろ水位センサによる水位監視を再開するようにし、前記ふろ水位センサの温度が浴水の温度に馴染むのに必要な一定時間は、前記高温さし湯の温度が高いほど長くなるようにしたことを特徴とするふろ給湯装置。 A bath circulation circuit for connecting bath water to the bath heat exchanger so that the bath water can circulate, a bath circulation pump provided in the bath circulation circuit for circulating bath water, and provided in the bath circulation circuit in the bath A bath water level sensor that monitors the water level of the bath, a hot water beam circuit that is connected to the bath circulation circuit and supplies hot water of a desired temperature to the bathtub, and the bath water level monitored by the bath water level sensor is below the target water level And a hot water supply apparatus comprising: a hot water supply circuit for supplying hot water at a set temperature via the hot water circulation circuit and the hot water circulation circuit to a predetermined amount or a target water level; When hot water for supplying hot water to the bathtub is started via the beam circuit and the bath circulation circuit, the water level monitoring by the bath water level sensor is interrupted, and after the hot water is finished, the bath circulation pump is stopped. When a certain time required for the temperature of the bath water level sensor to adjust to the bath water temperature after the hot water of the bath circulation circuit is replaced with bath water by temporarily driving the The water level monitoring by the bath water level sensor is restarted, and the fixed time required for the bath water level sensor to adjust to the bath water temperature is increased as the temperature of the hot water is increased. A bath water heater characterized by