JP6904815B2 - Hot water heater - Google Patents

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JP6904815B2
JP6904815B2 JP2017130899A JP2017130899A JP6904815B2 JP 6904815 B2 JP6904815 B2 JP 6904815B2 JP 2017130899 A JP2017130899 A JP 2017130899A JP 2017130899 A JP2017130899 A JP 2017130899A JP 6904815 B2 JP6904815 B2 JP 6904815B2
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hot water
flow rate
temperature
water supply
erosion
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JP2019015419A (en
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正貴 竹原
正貴 竹原
成樹 村山
成樹 村山
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Corona Corp
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Description

本発明は、潰食の発生を抑制しユーザの利便性を極力損なうことのない給湯装置に関するものである。 The present invention relates to a hot water supply device that suppresses the occurrence of erosion and does not impair the convenience of the user as much as possible.

従来よりこの種のものにおいては、給水管と、給水管の下流に設けた熱交換器と、熱交換器の下流に設けられ給湯栓を終端に有した給湯管と、熱交換器を流通する水を加熱するバーナと、給水管と給湯管とを接続し熱交換器をバイパスするバイパス管と、バイパス管にバイパス水量調整弁と、給湯管に設けられ出湯する流量を制御する出湯量調整弁とを備え、リモコンで設定された出湯設定温度になるように熱交換器で加熱された湯とバイパス管からの水とを混合して出湯するものがあり、リモコンで設定された出湯設定温度に応じて、流体の流速に起因する給湯流路の腐食(潰食)の発生を抑制するための特定流量になるように出湯量調整弁を制御するものであった。(例えば、特許文献1参照。) Conventionally, in this type of thing, a water supply pipe, a heat exchanger provided downstream of the water supply pipe, a hot water supply pipe provided downstream of the heat exchanger and having a hot water tap at the end, and a heat exchanger are circulated. A burner that heats water, a bypass pipe that connects the water supply pipe and the hot water supply pipe to bypass the heat exchanger, a bypass water amount adjusting valve on the bypass pipe, and a hot water discharge amount adjusting valve provided on the hot water supply pipe to control the flow rate of hot water. Some hot water is mixed with hot water heated by a heat exchanger and water from a bypass pipe so that the hot water set temperature set by the remote control is reached. Correspondingly, the hot water discharge amount adjusting valve was controlled so as to have a specific flow rate for suppressing the occurrence of corrosion (erosion) in the hot water supply flow path due to the flow velocity of the fluid. (See, for example, Patent Document 1.)

特開2000−274819号公報Japanese Unexamined Patent Publication No. 2000-274819

ところで、従来のものにおいては、リモコンで設定された出湯設定温度に応じて前記特定流量が変更され、給湯栓から出湯される流量が制限されることから、ユーザは所望の出湯流量を得られない場合があり、ユーザの利便性を損なってしまうという問題を有するものであった。 By the way, in the conventional one, the specific flow rate is changed according to the hot water set temperature set by the remote controller, and the flow rate of hot water discharged from the hot water tap is limited, so that the user cannot obtain the desired hot water flow rate. In some cases, there is a problem that the convenience of the user is impaired.

本発明は上記課題を解決するために、請求項1では、給水管と、該給水管の下流に設けた熱交換器と、該熱交換器の下流に設けた給湯管と、前記熱交換器を流通する水を加熱する加熱手段と、前記給水管と前記給湯管とを接続し前記熱交換器をバイパスするバイパス管と、前記給湯管と前記バイパス管との接続部に設けられ前記熱交換器から流出された湯と前記バイパス管からの水とを混合する混合弁と、前記給水管と前記バイパス管との接続部よりも下流側の前記給水管に設けられ前記熱交換器に流入する水の流量を検出する流量検出手段と、出湯流量を制御する流量調整手段と、前記混合弁から出湯させる湯の温度を設定する出湯温度設定手段と、それらの作動を制御する制御手段とを備え、前記制御手段は、前記熱交換器から流出させる湯の熱交出口目標温度を予め定められた規定温度に設定し、前記熱交換器から流出される湯が前記規定温度となるように前記加熱手段を制御すると共に前記熱交換器からの前記規定温度の湯と前記バイパス管からの水とを前記出湯温度設定手段によって設定された出湯設定温度に基づく温度の湯となるように混合弁を制御して出湯させる出湯動作を行う給湯装置において、ユーザの選択操作により通常時よりもエネルギーを制限して省エネルギー運転を行うようエコモード設定するエコモード設定手段を設け、前記出湯動作中に、前記制御手段が、前記流量検出手段の検出する検出流量が潰食が発生するおそれのある潰食危険流量に達したと判断したら、前記エコモード設定手段によりエコモード設定がされていないかどうか判断し、前記エコモード設定がされていない場合は、前記制御手段は、前記熱交出口目標温度を前記規定温度よりも高い潰食防止温度に変更する一方、前記エコモード設定がされていた場合には、前記流量調整手段の開度をそれまでよりも閉じる方向に制御するものとした。 In order to solve the above problems, in claim 1, the present invention comprises a water supply pipe, a heat exchanger provided downstream of the water supply pipe, a hot water supply pipe provided downstream of the heat exchanger, and the heat exchanger. A heating means for heating the water flowing through the water, a bypass pipe that connects the water supply pipe and the hot water supply pipe and bypasses the heat exchanger, and a heat exchange provided at a connection portion between the hot water supply pipe and the bypass pipe. A mixing valve that mixes hot water flowing out of the vessel and water from the bypass pipe is provided in the water supply pipe on the downstream side of the connection portion between the water supply pipe and the bypass pipe, and flows into the heat exchanger. It is provided with a flow rate detecting means for detecting the flow rate of water, a flow rate adjusting means for controlling the flow rate of hot water, a hot water temperature setting means for setting the temperature of hot water to be discharged from the mixing valve, and a control means for controlling their operation. The control means sets the heat exchange outlet target temperature of the hot water flowing out from the heat exchanger to a predetermined predetermined temperature, and heats the hot water flowing out from the heat exchanger to the predetermined temperature. While controlling the means, the mixing valve is controlled so that the hot water of the specified temperature from the heat exchanger and the water from the bypass pipe become hot water of a temperature based on the hot water set temperature set by the hot water temperature setting means. In the hot water supply device that performs the hot water discharge operation, the eco mode setting means for setting the eco mode so as to perform the energy saving operation by limiting the energy from the normal time by the user's selection operation is provided, and the control is performed during the hot water discharge operation. When the means determines that the detected flow rate detected by the flow rate detecting means has reached the erosion risk flow rate at which erosion may occur, it is determined whether or not the eco-mode setting is performed by the eco-mode setting means. If the eco-mode is not set, the control means changes the heat exchange outlet target temperature to a erosion prevention temperature higher than the specified temperature, while if the eco-mode is set, the control means changes the heat exchange outlet target temperature to a higher than the specified temperature. The opening degree of the flow rate adjusting means is controlled in a direction to be closed more than before.

また、請求項2では、前記流量検出手段の検出する検出流量が潰食が発生するおそれのある前記潰食危険流量に達したときであって、前記エコモード設定がされていない場合、前記制御手段は、前記流量検出手段で検出される検出流量が大きいほど前記潰食防止温度を高く設定するものとした。 Further, in claim 2, when the detected flow rate detected by the flow rate detecting means reaches the erosion dangerous flow rate at which erosion may occur and the eco-mode is not set, the control is performed. As the means, the larger the detected flow rate detected by the flow rate detecting means, the higher the erosion prevention temperature is set.

また、請求項3では、前記出湯動作中に前記熱交出口目標温度が前記潰食防止温度に変更された場合、前記制御手段は、その回の前記出湯動作が停止されるまでは前記熱交出口目標温度を前記潰食防止温度に維持するものとした。 Further, in claim 3, when the heat exchange outlet target temperature is changed to the erosion prevention temperature during the hot water discharge operation, the control means performs the heat exchange until the hot water discharge operation is stopped at that time. The outlet target temperature was maintained at the erosion prevention temperature.

また、請求項4では、前記出湯動作中に前記熱交出口目標温度が前記潰食防止温度に変更された回の出湯が停止した場合、前記制御手段は、前記熱交出口目標温度を前記規定温度に戻すものとした。 Further, in claim 4, when the hot water discharge is stopped at the time when the heat exchange outlet target temperature is changed to the erosion prevention temperature during the hot water discharge operation, the control means defines the heat exchange outlet target temperature. It was supposed to return to the temperature.

この発明の請求項1によれば、出湯動作中に、制御手段が、流量検出手段の検出する検出流量が潰食が発生するおそれのある潰食危険流量に達したと判断したら、エコモード設定手段によりエコモード設定がされていないかどうか判断し、エコモード設定がされていない場合は、制御手段は、熱交出口目標温度を規定温度よりも高い潰食防止温度に変更する一方、エコモード設定がされていた場合には、流量調整手段の開度をそれまでよりも閉じる方向に制御することで、エコモードが設定されていない通常の出湯動作中において、潰食が発生する危険がない流量では熱交出口目標温度を低く保って、加熱手段で消費される熱量を低減させて熱効率を向上させ、潰食が発生する危険がある流量以上に限って熱交出口目標温度を規定温度よりも高くすることで、湯側流路を流通する水または湯の流速が下がるので、潰食の発生を抑制することができるものであり、熱交出口目標温度の変更のみで出湯流量は変化しないことから、ユーザの利便性を損なうこともないものである。さらに、エコモードが設定されている時の出湯動作中において、潰食が発生する危険がない流量では流量調整手段の開度を変更せずそのままの開度とするので、出湯流量が必要以上に制限されることがなくユーザの利便性を損なうことがないものであり、潰食が発生する危険がある流量以上に限って流量調整手段の開度をそれまでの開度よりも閉じる方向に制御することで、出湯流量が制限され、湯側流路を流通する水または湯の流速が下がるので、潰食の発生を抑制することができ、流量調整手段の開度の変更のみで熱交出口目標温度は変化しないことから、熱効率の良い状態での出湯が可能である。また、潰食が発生する危険がある流量以上を検出した場合に限って出湯流量が制限されるが、ユーザは意識的に省エネルギーな運転をさせようとエコモード設定にするものであるから、出湯流量の制限が節水という省エネ機能として認識され、利便性の損失はある程度許容されるものである。 According to claim 1 of the present invention, if the control means determines that the detected flow rate detected by the flow rate detecting means has reached the crushing dangerous flow rate at which erosion may occur during the hot water discharge operation, the eco mode is set. It is determined whether or not the eco mode is set by the means, and if the eco mode is not set, the control means changes the heat exchange outlet target temperature to a erosion prevention temperature higher than the specified temperature, while the eco mode. If it is set, by controlling the opening of the flow rate adjusting means in the direction of closing more than before, there is no risk of erosion during normal hot water discharge operation in which the eco mode is not set. In the flow rate, the heat exchange outlet target temperature is kept low, the amount of heat consumed by the heating means is reduced to improve the heat efficiency, and the heat exchange outlet target temperature is set above the specified temperature only at the flow rate where there is a risk of erosion. By increasing the value, the flow rate of water or hot water flowing through the hot water side flow path decreases, so the occurrence of erosion can be suppressed, and the hot water flow rate does not change only by changing the heat exchange outlet target temperature. Therefore, the convenience of the user is not impaired. Furthermore, during the hot water discharge operation when the eco mode is set, if there is no risk of erosion, the opening of the flow rate adjusting means is not changed and the opening is kept as it is, so the hot water flow rate becomes more than necessary. It is not limited and does not impair the convenience of the user, and the opening degree of the flow rate adjusting means is controlled in the direction of closing more than the opening degree up to that point only when the flow rate is higher than the flow rate at which there is a risk of erosion. By doing so, the flow rate of hot water is restricted, and the flow rate of water or hot water flowing through the hot water side flow path is reduced, so that the occurrence of erosion can be suppressed, and the heat exchange outlet can be obtained only by changing the opening degree of the flow rate adjusting means. Since the target temperature does not change, it is possible to discharge hot water with good thermal efficiency. In addition, the flow rate of hot water is limited only when the flow rate is higher than the flow rate at which there is a risk of erosion, but since the user intentionally sets the eco mode to save energy, the hot water is discharged. The limitation of the flow rate is recognized as an energy saving function of saving water, and the loss of convenience is tolerated to some extent.

また、請求項2によれば、流量検出手段の検出する検出流量が潰食が発生するおそれのある潰食危険流量に達したときであって、エコモード設定がされていない場合、制御手段は、流量検出手段で検出される検出流量が大きいほど潰食防止温度を高く設定するようにしたことで、流量に見合った適切な潰食防止温度を設定でき、潰食の発生を抑制しつつ、熱交出口目標温度上昇に伴う熱効率の悪化をできるだけ抑制することができるものである。 Further, according to claim 2, when the detected flow rate detected by the flow rate detecting means reaches a crushing dangerous flow rate at which crushing may occur and the eco mode is not set, the control means is used. By setting the erosion prevention temperature higher as the detected flow rate detected by the flow rate detecting means is set, an appropriate erosion prevention temperature can be set according to the flow rate, and while suppressing the occurrence of erosion, The deterioration of thermal efficiency due to the rise in the target temperature at the heat exchange outlet can be suppressed as much as possible.

また、請求項3によれば、出湯動作中に熱交出口目標温度が潰食防止温度に変更された場合、制御手段は、その回の出湯動作が停止されるまでは熱交出口目標温度を潰食防止温度に維持するようにしたことで、出湯動作中に何度も熱交出口目標温度が変更されることがないので、温調性能が乱れることなく温度変動の少ない快適な出湯を行うことができるものである。 Further, according to claim 3, when the heat exchange outlet target temperature is changed to the erosion prevention temperature during the hot water discharge operation, the control means keeps the heat exchange outlet target temperature until the hot water discharge operation is stopped at that time. By maintaining the temperature to prevent erosion, the target temperature of the heat exchange outlet is not changed many times during the hot water discharge operation, so the hot water can be discharged comfortably with little temperature fluctuation without disturbing the temperature control performance. It is something that can be done.

また、請求項4によれば、出湯動作中に熱交出口目標温度が潰食防止温度に変更された回の出湯が停止した場合、制御手段は、熱交出口目標温度を規定温度に戻すようにしたことで、次回の出湯動作開始時において、潰食の危険がない流量域にて熱効率のよい出湯を行うことができるものである。 Further, according to claim 4, when the hot water discharge is stopped when the heat exchange outlet target temperature is changed to the erosion prevention temperature during the hot water discharge operation, the control means returns the heat exchange outlet target temperature to the specified temperature. By doing so, it is possible to discharge hot water with high thermal efficiency in a flow rate range where there is no risk of erosion at the start of the next hot water discharge operation.

本発明の一実施形態の給湯装置の概略構成図。The schematic block diagram of the hot water supply device of one Embodiment of this invention. 同一実施形態の給湯装置における出湯動作を示すフローチャート。The flowchart which shows the hot water discharge operation in the hot water supply device of the same embodiment. 同一実施形態の給湯装置において熱交出口目標温度を変更する潰食防止制御実施前後の状態を説明する説明図。The explanatory view explaining the state before and after the implementation of the erosion prevention control which changes the heat exchange outlet target temperature in the hot water supply apparatus of the same embodiment. 同一実施形態の給湯装置において水比例弁を制御する潰食防止制御実施前後の状態を説明する説明図。The explanatory view explaining the state before and after the implementation of the erosion prevention control which controls a water proportional valve in the hot water supply device of the same embodiment.

次に、本発明の一実施形態の給湯装置について図1に基づいて説明する。 Next, the hot water supply device according to the embodiment of the present invention will be described with reference to FIG.

1は本実施形態の給湯装置、2は灯油等を燃料とし燃料を燃焼させて火炎を発生させる加熱手段としてバーナ、3は台所や洗面所等の所定箇所に設けられた給湯栓、4は給湯装置1を遠隔操作する操作手段としてのリモコンである。 1 is a hot water supply device of the present embodiment, 2 is a burner as a heating means for burning fuel by burning kerosene or the like to generate a flame, 3 is a hot water tap provided at a predetermined place such as a kitchen or a washroom, and 4 is a hot water supply. It is a remote controller as an operating means for remotely operating the device 1.

5はフィンアンドチューブ式の熱交換器、6は熱交換器5の上流に設けられ給水源から供給される水を熱交換器5に流通させる給水管、7は熱交換器5の下流に設けられ熱交換器5で加熱された湯を流通させ、終端に備えられた給湯栓3に湯を供給する給湯管、8は給水管6から分岐され、給水管6と給湯管7とを接続し熱交換器5をバイパスするバイパス管、9は給湯管7とバイパス管8との接続部に設けられ熱交換器5で加熱された湯とバイパス管8からの水とを混合する混合弁で、混合弁9は内部の弁体の弁開度を調整することで湯と水の混合比を調整した所望の温度の湯を出湯させるものである。なお、給水管6と給湯管7とバイパス管8とで給湯用の水が流通する給湯流路を構成するものである。 5 is a fin-and-tube heat exchanger, 6 is a water supply pipe provided upstream of the heat exchanger 5 to circulate water supplied from the water supply source to the heat exchanger 5, and 7 is provided downstream of the heat exchanger 5. A hot water supply pipe that distributes hot water heated by the heat exchanger 5 and supplies hot water to a hot water tap 3 provided at the end, 8 is branched from the water supply pipe 6 and connects the water supply pipe 6 and the hot water supply pipe 7. The bypass pipe 9 that bypasses the heat exchanger 5 is a mixing valve provided at the connection portion between the hot water supply pipe 7 and the bypass pipe 8 and mixes the hot water heated by the heat exchanger 5 and the water from the bypass pipe 8. The mixing valve 9 adjusts the valve opening degree of the internal valve body to discharge hot water at a desired temperature in which the mixing ratio of hot water and water is adjusted. The water supply pipe 6, the hot water supply pipe 7, and the bypass pipe 8 form a hot water supply flow path through which water for hot water supply flows.

10は給水管6に設けられ給水の温度を検出する給水温度センサ、11は給水管6とバイパス管8との接続部よりも下流側の給水管6に設けられ熱交換器5に流入する水の流量を検出する流量検出手段としての流量センサ、12は給湯管7とバイパス管8との接続部よりも上流側の給湯管7に設けられた熱交出口温度検出手段としての熱交出口温度センサで、熱交出口温度センサ12は、熱交換器5から流出する湯の温度を検出するものである。13は混合弁9で混合された湯の温度を検出する出湯温度検出手段としての出湯温度センサ、14は給湯管7とバイパス管8との接続部(混合弁9接続位置)よりも下流側の給湯管7に設けられ出湯される流量を制御する流量調整手段としての水比例弁である。 Reference numeral 10 is a water supply temperature sensor provided in the water supply pipe 6 for detecting the temperature of the water supply, and 11 is a water supply pipe 6 provided in the water supply pipe 6 downstream of the connection portion between the water supply pipe 6 and the bypass pipe 8 and flows into the heat exchanger 5. The flow sensor 12 is a heat exchange outlet temperature as a heat exchange outlet temperature detecting means provided in the hot water supply pipe 7 on the upstream side of the connection portion between the hot water supply pipe 7 and the bypass pipe 8. In the sensor, the heat exchange outlet temperature sensor 12 detects the temperature of the hot water flowing out from the heat exchanger 5. Reference numeral 13 is a hot water outlet temperature sensor as a hot water outlet temperature detecting means for detecting the temperature of the hot water mixed by the mixing valve 9, and 14 is a downstream side from the connection portion (mixing valve 9 connection position) between the hot water supply pipe 7 and the bypass pipe 8. It is a water proportional valve provided in the hot water supply pipe 7 as a flow rate adjusting means for controlling the flow rate of hot water discharged.

15は浴槽、16は混合弁9より下流側の給湯管7から分岐し浴槽15へ湯を供給する湯張り管で、湯張り管16には、湯張り管16を開閉する湯張り弁17と、浴槽15への時間当たりの湯張り流量を検出する風呂流量センサ18と、浴槽15からの浴槽水の逆流を防ぐ二重の逆止弁19とが設けられているものである。 Reference numeral 15 is a bathtub, and 16 is a hot water filling pipe that branches from the hot water supply pipe 7 on the downstream side of the mixing valve 9 to supply hot water to the bathtub 15. The hot water filling pipe 16 has a hot water filling valve 17 that opens and closes the hot water filling pipe 16. A bath flow rate sensor 18 that detects the flow rate of hot water filled in the bathtub 15 per hour, and a double check valve 19 that prevents backflow of bathtub water from the bathtub 15 are provided.

前記リモコン4には、混合弁9から出湯させ給湯栓3へ供給させる湯温を設定する出湯温度設定手段としての給湯温度設定スイッチ20と、混合弁9から出湯させ湯張り管16を介して浴槽15へ供給する湯温を設定する出湯温度設定手段としての風呂温度設定スイッチ21と、浴槽15へ風呂設定温度の湯を設定された湯張り量注湯させて湯張りする湯張り運転の開始を指示する湯張りスイッチ22と、通常時よりもエネルギーを制限して省エネルギー運転を行うようエコモード設定するエコモード設定手段としてのエコモードスイッチ23と、給湯装置1の状態や、給湯温度設定スイッチ20で設定された出湯設定温度としての給湯設定温度、風呂温度設定スイッチ21で設定された出湯設定温度としての風呂設定温度、設定湯張り量、エコモードが設定されているか否かなどを表示する表示部24とが設けられているものである。なお、ユーザの選択操作によりエコモードスイッチ23がONされエコモードが設定された場合、リモコン4の表示部24に表示される給湯設定温度は変更されることなく、給湯栓3から出湯される湯温を給湯設定温度よりも所定温度(例えば1℃)低くしたり、リモコン4の表示部24に表示される風呂設定温度は変更されることなく、浴槽15に注湯される湯温を風呂設定温度よりも所定温度(例えば1℃)低くしたり、リモコン4の表示部24に表示される設定湯張り量は変更されることなく、浴槽15に注湯される設定湯張り量よりも所定量(例えば10L)少なくするというように、設定温度を低くして通常時よりも燃料量を低減させる、あるいは、湯張り量(水の使用量)を減らして、減量した分の水を加熱するのに必要な燃料量分を通常時よりも低減させる省エネな運転を行わせることができるものである。 The remote control 4 has a hot water supply temperature setting switch 20 as a hot water temperature setting means for setting a hot water temperature to be supplied from the mixing valve 9 to the hot water tap 3, and a bathtub via a hot water filling pipe 16 for hot water to be discharged from the mixing valve 9. The bath temperature setting switch 21 as a hot water temperature setting means for setting the hot water temperature to be supplied to the bathtub 15 and the hot water filling operation for filling the bathtub 15 with the set hot water filling amount are started. The hot water filling switch 22 for instructing, the eco mode switch 23 as an eco mode setting means for setting the eco mode so as to perform energy saving operation by limiting the energy compared to the normal time, the state of the hot water supply device 1, and the hot water supply temperature setting switch 20. A display that displays the hot water supply set temperature as the hot water supply set temperature set in, the bath set temperature as the hot water set temperature set by the bath temperature setting switch 21, the set hot water filling amount, and whether or not the eco mode is set. A part 24 is provided. When the eco-mode switch 23 is turned on and the eco-mode is set by the user's selection operation, the hot water supply set temperature displayed on the display unit 24 of the remote control 4 is not changed and the hot water is discharged from the hot water supply tap 3. The hot water temperature to be poured into the bathtub 15 is set to the bath without changing the temperature set to a predetermined temperature (for example, 1 ° C.) lower than the hot water supply set temperature or changing the bath set temperature displayed on the display unit 24 of the remote control 4. The predetermined amount of hot water is lower than the temperature (for example, 1 ° C.), and the set amount of hot water displayed on the display unit 24 of the remote control 4 is not changed. The set temperature is lowered to reduce the amount of fuel (for example, 10 L), or the amount of hot water filling (the amount of water used) is reduced to heat the reduced amount of water. It is possible to carry out energy-saving operation in which the amount of fuel required for the water heater is reduced as compared with the normal time.

25はマイクロコンピュータを主体として、給湯装置1の各センサからの信号やリモコン4からの信号を受け、各アクチュエータの駆動を制御する制御手段で、この制御手段25は、熱交換器5から流出させる湯の熱交出口目標温度を設定する機能を有しており、給湯温度設定スイッチ20または風呂温度設定スイッチ21で設定された設定温度の湯を出湯する場合、制御手段25は、熱交出口温度センサ12で検出される湯の温度が設定された熱交出口目標温度になるように、バーナ2の燃焼量を制御、すなわちバーナ2によって熱交換器5を流通する水へ与える加熱量を制御し、出湯温度センサ13で検出される湯の温度が給湯温度設定スイッチ20または風呂温度設定スイッチ21で設定された設定温度に基づく温度の湯となるように混合弁9の開度を制御するものである。なお、上記の給湯温度設定スイッチ20または風呂温度設定スイッチ21で設定された設定温度に基づく温度の湯とは、給湯設定温度の湯または風呂設定温度の湯の他に、エコモードが設定されていた場合の給湯設定温度よりも所定温度低い温度の湯または風呂設定温度よりも所定温度低い温度の湯を含むものである。 Reference numeral 25 denotes a control means for controlling the drive of each actuator by receiving a signal from each sensor of the hot water supply device 1 and a signal from the remote control 4 mainly by a microcomputer. The control means 25 causes the heat exchanger 5 to flow out. It has a function to set the heat exchange outlet target temperature of hot water, and when hot water of the set temperature set by the hot water supply temperature setting switch 20 or the bath temperature setting switch 21 is discharged, the control means 25 has the heat exchange outlet temperature. The amount of combustion of the burner 2 is controlled so that the temperature of the hot water detected by the sensor 12 reaches the set target temperature of the heat exchange outlet, that is, the amount of heat given to the water flowing through the heat exchanger 5 by the burner 2 is controlled. The opening degree of the mixing valve 9 is controlled so that the temperature of the hot water detected by the hot water temperature sensor 13 becomes the hot water having a temperature based on the set temperature set by the hot water supply temperature setting switch 20 or the bath temperature setting switch 21. be. The hot water having a temperature based on the set temperature set by the hot water supply temperature setting switch 20 or the bath temperature setting switch 21 is set to an eco mode in addition to the hot water supply set temperature hot water or the bath set temperature hot water. In this case, it includes hot water having a temperature lower than the set temperature of hot water supply or hot water having a temperature lower than the set temperature of the bath.

また、制御手段25は、給湯栓3からの出湯、あるいは浴槽15への湯張りを行う出湯動作中において、流量センサ11が給湯流路を構成する配管内に潰食を発生させるおそれがある所定流量以上を検出した場合、潰食防止制御を実行するものであり、潰食防止制御では、出湯動作中において流量センサ11が前記所定流量以上を検出したときに、エコモードスイッチ23がONされておらず、エコモードが設定されていない通常時の場合、制御手段25は、熱交出口目標温度をそれまで設定していた目標温度よりも高い目標温度に変更する一方、出湯動作中において流量センサ11が前記所定流量以上を検出したときに、ユーザの選択操作によりエコモードスイッチ23がONされてエコモードが設定されている場合、制御手段25は、水比例弁14の開度を閉じ方向に制御し出湯流量を制限するものである。上記潰食防止制御の詳細については後述する。 Further, the control means 25 has a predetermined value that the flow rate sensor 11 may cause erosion in the pipe forming the hot water supply flow path during the hot water discharge operation of hot water discharge from the hot water supply plug 3 or hot water filling the bathtub 15. When the flow rate or more is detected, the erosion prevention control is executed. In the erosion prevention control, the eco-mode switch 23 is turned on when the flow rate sensor 11 detects the predetermined flow rate or more during the hot water discharge operation. In the normal case where the eco mode is not set, the control means 25 changes the heat exchange outlet target temperature to a target temperature higher than the previously set target temperature, while the flow rate sensor during the hot water discharge operation. When the eco-mode switch 23 is turned on and the eco-mode is set by the user's selection operation when 11 detects the predetermined flow rate or more, the control means 25 closes the opening degree of the water proportional valve 14 in the closing direction. It controls and limits the flow rate of hot water. The details of the erosion prevention control will be described later.

次に、この一実施形態の給湯装置1の出湯動作について、図2のフローチャートを用いて説明する。なお、ここでは、給湯栓3から出湯するための出湯動作についてのみ説明するものとし、浴槽15へ湯張りするための出湯動作については、出湯先が給湯栓3か浴槽15かの違いだけであるため、給湯栓3から出湯するための出湯動作と同様であるため説明を省略する。 Next, the hot water discharge operation of the hot water supply device 1 of this embodiment will be described with reference to the flowchart of FIG. Here, only the hot water discharge operation for discharging hot water from the hot water tap 3 will be described, and the hot water discharge operation for filling the bathtub 15 is only the difference between the hot water tap 3 and the bathtub 15. Therefore, the description is omitted because it is the same as the hot water discharge operation for discharging hot water from the hot water tap 3.

今、適宜箇所の給湯栓3が開栓されて出湯が開始されると、この水の流れを流量センサ11が検知し、制御手段25は、流量センサ11の検出する流量に基づいて、流量センサ11の検出する検出流量が最低作動流量以上か否か判断し(ステップS1)、最低作動流量以上であると判断すると、燃焼要求ありとしてバーナ2の燃焼を開始させ、熱交換器5を流通する水を加熱するものである。この時、熱交換器5から流出させる湯の熱交出口目標温度は、リモコン4の給湯温度設定スイッチ20で設定された給湯設定温度(例えば40℃)よりも高温の予め定められた規定温度(例えば50℃)に設定され、熱交出口温度センサ12で検出される湯温が前記規定温度になるように、制御手段25がバーナ2の燃焼量を制御するものである。 Now, when the hot water supply plug 3 at an appropriate position is opened and hot water discharge is started, the flow rate sensor 11 detects the flow of this water, and the control means 25 determines the flow rate sensor based on the flow rate detected by the flow rate sensor 11. It is determined whether or not the detected flow rate detected by 11 is equal to or higher than the minimum operating flow rate (step S1), and if it is determined to be equal to or higher than the minimum operating flow rate, the burner 2 is started to burn as a combustion request is made, and the heat exchanger 5 is circulated. It heats water. At this time, the target temperature of the heat exchange outlet of the hot water flowing out from the heat exchanger 5 is a predetermined predetermined temperature (for example, 40 ° C.) higher than the hot water supply set temperature (for example, 40 ° C.) set by the hot water supply temperature setting switch 20 of the remote control 4. For example, the temperature is set to 50 ° C.), and the control means 25 controls the combustion amount of the burner 2 so that the hot water temperature detected by the heat exchange outlet temperature sensor 12 becomes the specified temperature.

そして、熱交換器5から流出した規定温度の湯とバイパス管8からの水とを混合弁9で混合し、制御手段25は、出湯温度センサ13で検出される湯温が給湯温度設定スイッチ20で設定された給湯設定温度になるように、混合弁9の開度を制御するものであり、出湯温度センサ13で検出される湯温が給湯設定温度より高い場合は、湯側を絞り、水側を開くように混合弁9内部の弁体の弁開度を調整して、給湯設定温度の湯を給湯栓3へ供給し出湯するものであり、出湯温度センサ13で検出される湯温が給湯設定温度より低い場合は、水側を絞り、湯側を開くように混合弁9内部の弁体の弁開度を調整して、給湯設定温度の湯を給湯栓3へ供給し出湯するものである。なお、上述の制御手段25による制御は、流量センサ11で検出される流量が最低作動流量以上且つ給湯流路を構成する配管内に潰食を発生させるおそれがある予め設定された潰食危険流量未満の範囲内であって、エコモードが設定されていない通常の出湯動作時に行われている制御であり、流量センサ11で検出される流量が最低作動流量以上且つ前記潰食危険流量未満の範囲内であって、エコモードが設定されている場合の出湯動作時には、相違点のみ示すと、制御手段25は、出湯温度センサ13で検出される湯温が給湯温度設定スイッチ20で設定された給湯設定温度よりも所定温度(例えば1℃)低い温度になるように、混合弁9の開度を制御して、通常時よりも省エネルギー運転を行うものである。 Then, the hot water of the specified temperature flowing out of the heat exchanger 5 and the water from the bypass pipe 8 are mixed by the mixing valve 9, and the control means 25 uses the hot water supply temperature setting switch 20 for the hot water temperature detected by the hot water temperature sensor 13. The opening degree of the mixing valve 9 is controlled so as to reach the hot water supply set temperature set in step 1, and when the hot water temperature detected by the hot water outlet temperature sensor 13 is higher than the hot water supply set temperature, the hot water side is throttled and water is used. The valve opening of the valve body inside the mixing valve 9 is adjusted so as to open the side, and hot water of the hot water supply set temperature is supplied to the hot water supply tap 3 to discharge the hot water. If the temperature is lower than the hot water supply set temperature, the water side is throttled, the valve opening of the valve body inside the mixing valve 9 is adjusted so as to open the hot water side, and hot water at the hot water supply set temperature is supplied to the hot water tap 3 to be discharged. Is. In the control by the control means 25 described above, the flow rate detected by the flow rate sensor 11 is equal to or higher than the minimum operating flow rate, and there is a risk of causing erosion in the pipes constituting the hot water supply flow path. The control is performed during normal hot water discharge operation in which the eco mode is not set, and the flow rate detected by the flow rate sensor 11 is equal to or more than the minimum operating flow rate and less than the erosion risk flow rate. In the hot water supply operation when the eco mode is set, the control means 25 has the hot water supply temperature set by the hot water supply temperature setting switch 20 in which the hot water temperature detected by the hot water discharge temperature sensor 13 is shown. The opening degree of the mixing valve 9 is controlled so that the temperature becomes lower than the set temperature by a predetermined temperature (for example, 1 ° C.), and the energy saving operation is performed as compared with the normal time.

また、出湯動作中、制御手段25は、流量センサ11の検出する流量に基づいて、流量センサ11の検出する検出流量が潰食危険流量以上となったか否か判断し(ステップS2)、潰食危険流量以上となったと判断すると、制御手段25は、エコモードが設定されていないかどうか、すなわち、エコモードスイッチ23がONされていないかどうかを判断し(ステップS3)、エコモードが設定されていないと判断すると、制御手段25は、熱交出口目標温度をそれまでの熱交出口目標温度であった規定温度(50℃)から、規定温度よりも高い温度である潰食防止温度(例えば57℃)に熱交出口目標温度を変更するものである(ステップS4)。一方、前記ステップS3で、制御手段25が、エコモードが設定されている、すなわち、ユーザの選択操作によりエコモードスイッチ23がONされていると判断すると、水比例弁14をそれまでの開度よりも閉じる方向に制御し、出湯流量を制限するものである(ステップS5)。なお、前記ステップS2において、制御手段25は、流量センサ11の検出する検出流量が潰食危険流量以上となったか否かを判断したが、制御手段25は、流量センサ11の検出する検出流量が潰食危険流量以上となった状態を所定時間(例えば10秒)連続で検知したか否かを判断してもよいものである。 Further, during the hot water discharge operation, the control means 25 determines whether or not the detected flow rate detected by the flow rate sensor 11 is equal to or higher than the erosion risk flow rate based on the flow rate detected by the flow rate sensor 11 (step S2), and crushes. When it is determined that the flow rate has exceeded the dangerous flow rate, the control means 25 determines whether or not the eco-mode is set, that is, whether or not the eco-mode switch 23 is turned on (step S3), and the eco-mode is set. If it is determined that the temperature is not set, the control means 25 sets the heat exchange outlet target temperature to a erosion prevention temperature (for example, a temperature higher than the specified temperature) from the specified temperature (50 ° C.) which was the heat exchange outlet target temperature up to that point. The heat exchange outlet target temperature is changed to 57 ° C.) (step S4). On the other hand, in step S3, when the control means 25 determines that the eco mode is set, that is, the eco mode switch 23 is turned on by the user's selection operation, the water proportional valve 14 is opened up to that point. It is controlled in the closing direction to limit the flow rate of hot water (step S5). In step S2, the control means 25 determines whether or not the detected flow rate detected by the flow rate sensor 11 is equal to or greater than the erosion risk flow rate, but the control means 25 determines whether the detected flow rate detected by the flow rate sensor 11 is equal to or higher than the erosion risk flow rate. It may be determined whether or not a state in which the flow rate exceeds the risk of erosion is continuously detected for a predetermined time (for example, 10 seconds).

ここで、前記ステップS3の処理から前記ステップS4の処理に移行する潰食防止制御が行われた場合の給湯装置1の状態について、図3を用いて詳細に説明する。なお、前提として、給湯流路を構成する配管のうち、例えば熱交換器5を構成する配管の内径が最小でありその配管内径をφ14、給水温度15℃、熱交出口目標温度50℃、給湯設定温度40℃で出湯動作が行われているときに、流量センサ11で検出される検出流量が、潰食危険流量を超えた場合を想定するものとする。ここで挙げた数値はあくまで一例であり、特に限定されるものではない。 Here, the state of the hot water supply device 1 when the erosion prevention control for shifting from the process of step S3 to the process of step S4 is performed will be described in detail with reference to FIG. As a premise, among the pipes constituting the hot water supply flow path, for example, the inner diameter of the pipe constituting the heat exchanger 5 is the smallest, and the inner diameter of the pipe is φ14, the water supply temperature is 15 ° C., the heat exchange outlet target temperature is 50 ° C., and the hot water supply is hot. It is assumed that the detected flow rate detected by the flow rate sensor 11 exceeds the erosion risk flow rate when the hot water discharge operation is performed at the set temperature of 40 ° C. The numerical values given here are merely examples and are not particularly limited.

まず、図3に示すように、エコモードが設定されていない通常時の出湯動作中に、総流量が22L/minで、熱交換器5に流入する流量として、流量センサ11の検出する検出流量が15.7L/minであった場合、熱交換器5の配管内の流速は流量15.7L/minから換算して1.70m/sとなり、制御手段25は、検出流量が潰食危険流量を超えたものと判断し、熱交出口目標温度をそれまでの目標温度であった50℃から、潰食防止温度である57℃へと目標温度を高くするものである。ここで、潰食について補足説明すると、潰食とは流体が流通する配管内で発生する腐食現象で、流体の流速が速いときなどに、配管内表面が馬蹄形状にえぐられるように腐食するものであり、流速として1.5m/sを超えると潰食が発生する危険性が高まるものとされている。図3に示した給湯装置1においては、流量が13.8L/min(流速に換算すると約1.5m/s)を超えると、配管内径φ14の配管を有する熱交換器5の配管内で潰食が発生する危険性があるため、潰食危険流量として13.8L/minを予め記憶しておき、制御手段25は、流量センサ11で検出される流量と上記潰食危険流量とを比較し、潰食が発生するおそれがあるか否かの判断を行っている。なお、上記潰食危険流量は、給湯流路を構成する配管の配管内径(または流路断面積)と密接な関係があり、給湯流路を構成する配管の配管内径(または流路断面積)を考慮して定められるものである。 First, as shown in FIG. 3, the detected flow rate detected by the flow rate sensor 11 is the flow rate that flows into the heat exchanger 5 at a total flow rate of 22 L / min during the normal hot water discharge operation in which the eco mode is not set. When is 15.7 L / min, the flow velocity in the pipe of the heat exchanger 5 is 1.70 m / s when converted from the flow rate of 15.7 L / min, and the detected flow rate of the control means 25 is a erosion dangerous flow rate. The target temperature of the heat exchange outlet is raised from the previous target temperature of 50 ° C. to 57 ° C., which is the erosion prevention temperature. Here, a supplementary explanation of erosion is a corrosion phenomenon that occurs in the pipe through which the fluid flows, and when the flow velocity of the fluid is high, the inner surface of the pipe is corroded so as to be scooped out in a horseshoe shape. Therefore, if the flow velocity exceeds 1.5 m / s, the risk of erosion increases. In the hot water supply device 1 shown in FIG. 3, when the flow rate exceeds 13.8 L / min (about 1.5 m / s when converted to the flow velocity), it is crushed in the pipe of the heat exchanger 5 having a pipe having a pipe inner diameter of φ14. Since there is a risk of erosion, 13.8 L / min is stored in advance as the erosion dangerous flow rate, and the control means 25 compares the flow rate detected by the flow rate sensor 11 with the erosion dangerous flow rate. , Judgment is made as to whether or not there is a risk of erosion. The erosion risk flow rate is closely related to the pipe inner diameter (or flow path cross-sectional area) of the pipes constituting the hot water supply flow path, and is closely related to the pipe inner diameter (or flow path cross-sectional area) of the pipes constituting the hot water supply flow path. It is determined in consideration of.

そして、上述のように、熱交出口目標温度が50℃から57℃に変更されると、混合弁9で混合される湯側の温度が高くなるため、給湯設定温度40℃の湯を出湯するのに、湯側を絞り、水側を開くように混合弁9が制御され、熱交換器5を流通する水の流量が13.1L/min(流速に換算すると1.42m/s)に減少すると共にバイパス管8を流通する水の流量が8.9L/minに増えるものである。この時、水比例弁14の開度は潰食防止制御実施前後で変更されず出湯流量は22L/minのままであり、出湯流量が制限されることがないため、ユーザの利便性を損なうことがないものである。 Then, as described above, when the heat exchange outlet target temperature is changed from 50 ° C. to 57 ° C., the temperature on the hot water side mixed by the mixing valve 9 rises, so that hot water having a hot water supply set temperature of 40 ° C. is discharged. However, the mixing valve 9 is controlled so that the hot water side is throttled and the water side is opened, and the flow rate of water flowing through the heat exchanger 5 is reduced to 13.1 L / min (1.42 m / s when converted to the flow velocity). At the same time, the flow rate of water flowing through the bypass pipe 8 increases to 8.9 L / min. At this time, the opening degree of the water proportional valve 14 is not changed before and after the implementation of the erosion prevention control, and the flow rate of the hot water remains at 22 L / min, and the flow rate of the hot water is not limited, which impairs the convenience of the user. There is no such thing.

以上より、エコモードが設定されていない通常の出湯動作中において、流量センサ11の検出する検出流量が潰食危険流量に達した場合に、熱交出口目標温度を規定温度よりも高い温度である潰食防止温度に変更するようにしたことで、潰食が発生する危険がない流量では熱交出口目標温度を低く保って、バーナ2で消費される熱量を低減させて熱効率を向上させ、潰食が発生する危険がある流量以上に限って熱交出口目標温度を規定温度よりも高くすることで、給湯流路のうち、給水管6とバイパス管8の接続部よりも下流側の給水管6および熱交換器5および給湯管7とバイパス管8の接続部よりも上流側の給湯管7からなる湯側流路を流通する水または湯の流速が下がるので、潰食の発生を抑制することができるものであり、熱交出口目標温度の変更のみで出湯流量は変化しないことから、ユーザの利便性を損なうこともないものである。 From the above, when the detected flow rate detected by the flow rate sensor 11 reaches the erosion danger flow rate during normal hot water discharge operation in which the eco mode is not set, the heat exchange outlet target temperature is higher than the specified temperature. By changing to the crush prevention temperature, the heat exchange outlet target temperature is kept low at a flow rate where there is no risk of crushing, the amount of heat consumed by the burner 2 is reduced, the heat efficiency is improved, and crushing is performed. By setting the heat exchange outlet target temperature higher than the specified temperature only at a flow rate higher than the flow rate at which there is a risk of erosion, the water supply pipe on the downstream side of the connection between the water supply pipe 6 and the bypass pipe 8 in the hot water supply flow path. Since the flow velocity of water or hot water flowing through the hot water side flow path consisting of the hot water supply pipe 7 on the upstream side of the connection portion of 6 and the heat exchanger 5 and the hot water supply pipe 7 and the bypass pipe 8 is reduced, the occurrence of erosion is suppressed. This is possible, and since the flow rate of hot water does not change only by changing the heat exchange outlet target temperature, the convenience of the user is not impaired.

また、熱交出口目標温度を潰食防止温度に変更した場合には、制御手段25は、その回の出湯動作が停止されるまでは熱交出口目標温度を潰食防止温度に維持するようにしてもよく、この場合、出湯動作中に何度も熱交出口目標温度が変更されることがないので、温調性能が乱れることなく温度変動の少ない快適な出湯を行うことができるものである。 Further, when the heat exchange outlet target temperature is changed to the erosion prevention temperature, the control means 25 maintains the heat exchange outlet target temperature at the erosion prevention temperature until the hot water discharge operation at that time is stopped. In this case, since the heat exchange outlet target temperature is not changed many times during the hot water discharge operation, it is possible to perform a comfortable hot water discharge with little temperature fluctuation without disturbing the temperature control performance. ..

さらに、熱交出口目標温度を潰食防止温度に変更した回の出湯が停止した場合、制御手段25は、熱交出口目標温度を元の温度である規定温度に戻すようにしてもよく、この場合、次回の出湯動作開始時において、潰食の危険がない流量域にて熱効率のよい出湯を行うことができるものである。 Further, when the hot water discharge is stopped when the heat exchange outlet target temperature is changed to the erosion prevention temperature, the control means 25 may return the heat exchange outlet target temperature to a specified temperature which is the original temperature. In this case, when the next hot water discharge operation is started, the hot water can be discharged with high thermal efficiency in a flow rate range where there is no risk of erosion.

なお、本実施形態では、前記潰食防止温度を固定の57℃としているが、流量センサ11で検出される検出流量に応じた潰食防止温度を設定できるようなものであってもよく、例えば、検出流量が13.8L/min〜16L/min未満の範囲内の場合は潰食防止温度を57℃、検出流量が16L/min〜18L/min未満の範囲内の場合は潰食防止温度を60℃とするなど、制御手段25は、流量センサ11で検出される検出流量が大きいほど潰食防止温度を高く設定するようにすることで、流量に見合った適切な潰食防止温度を設定でき、潰食の発生を抑制しつつ、熱交出口目標温度上昇に伴う熱効率の悪化をできるだけ抑制することができるものである。 In the present embodiment, the erosion prevention temperature is fixed at 57 ° C., but the erosion prevention temperature may be set according to the detected flow rate detected by the flow rate sensor 11, for example. When the detected flow rate is within the range of 13.8 L / min to less than 16 L / min, the erosion prevention temperature is set to 57 ° C., and when the detected flow rate is within the range of 16 L / min to less than 18 L / min, the erosion prevention temperature is set. The control means 25 can set an appropriate erosion prevention temperature corresponding to the flow rate by setting the erosion prevention temperature higher as the detected flow rate detected by the flow rate sensor 11 becomes larger, such as 60 ° C. While suppressing the occurrence of erosion, the deterioration of thermal efficiency due to the rise in the target temperature at the heat exchange outlet can be suppressed as much as possible.

次に、前記ステップS3の処理から前記ステップS5の処理に移行する潰食防止制御が行われた場合の給湯装置1の状態について、図4を用いて詳細に説明する。なお、前提として、給湯流路を構成する配管のうち、例えば熱交換器5を構成する配管の内径が最小でありその配管内径をφ14、給水温度15℃、熱交出口目標温度50℃、給湯設定温度40℃で出湯動作が行われているときに、流量センサ11で検出される検出流量が、潰食危険流量を超えた場合を想定するものとする。ここで挙げた数値はあくまで一例であり、特に限定されるものではない。なお、ここではエコモードが設定されているため、リモコン4の表示部24に表示されている給湯設定温度は40℃だが、制御上は給湯設定温度は39℃で制御されるものとする。 Next, the state of the hot water supply device 1 when the erosion prevention control for shifting from the process of step S3 to the process of step S5 is performed will be described in detail with reference to FIG. As a premise, among the pipes constituting the hot water supply flow path, for example, the inner diameter of the pipe constituting the heat exchanger 5 is the smallest, and the inner diameter of the pipe is φ14, the water supply temperature is 15 ° C., the heat exchange outlet target temperature is 50 ° C., and the hot water supply is hot. It is assumed that the detected flow rate detected by the flow rate sensor 11 exceeds the erosion risk flow rate when the hot water discharge operation is performed at the set temperature of 40 ° C. The numerical values given here are merely examples and are not particularly limited. Since the eco mode is set here, the hot water supply set temperature displayed on the display unit 24 of the remote controller 4 is 40 ° C., but the hot water supply set temperature is controlled at 39 ° C. in terms of control.

まず、ユーザの選択操作によりエコモードが設定されたエコモード時の出湯動作中に、総流量が22L/minで、熱交換器5に流入する流量として、流量センサ11の検出する検出流量が15.1L/minであった場合、熱交換器5の配管内の流速は流量15.1L/minから換算して1.64m/sとなり、制御手段25は、検出流量が潰食危険流量を超えたものと判断し、水比例弁14の開度を、それまでの開度から流量センサ11で検出される検出流量が潰食危険流量を下回るまで閉じる方向に制御し(ただし、全閉を除く)、出湯流量を制限するものである。 First, the total flow rate is 22 L / min, and the detected flow rate detected by the flow rate sensor 11 is 15 as the flow rate flowing into the heat exchanger 5 during the hot water discharge operation in the eco mode in which the eco mode is set by the user's selection operation. When it is .1 L / min, the flow velocity in the pipe of the heat exchanger 5 becomes 1.64 m / s when converted from the flow rate of 15.1 L / min, and the detected flow rate of the control means 25 exceeds the erosion risk flow rate. The opening degree of the water proportional valve 14 is controlled in the direction of closing from the opening degree up to that point until the detected flow rate detected by the flow rate sensor 11 falls below the erosion risk flow rate (however, excluding fully closed). ), It limits the flow rate of hot water.

そして、上述のように、水比例弁14の開度が閉じる方向に制御されると、出湯流量(総流量)が22L/minから19L/minに制限され、熱交換器5を流通する水の流量が13.0L/min(流速に換算すると1.41m/s)に減少するものである。この時、熱交出口目標温度は潰食防止制御実施前後で変更されず50℃のままであり、熱交出口目標温度を上げた場合に比べて熱効率がよいものである。 Then, as described above, when the opening degree of the water proportional valve 14 is controlled in the closing direction, the hot water flow rate (total flow rate) is limited from 22 L / min to 19 L / min, and the water flowing through the heat exchanger 5 is used. The flow rate is reduced to 13.0 L / min (1.41 m / s when converted to the flow velocity). At this time, the target temperature of the heat exchange outlet is not changed before and after the implementation of the erosion prevention control and remains at 50 ° C., which is more efficient than the case where the target temperature of the heat exchange outlet is raised.

以上より、エコモード設定時の出湯動作中において、流量センサ11の検出する検出流量が潰食危険流量に達した場合に、水比例弁14の開度をそれまでの開度よりも閉じる方向に制御するようにしたことで、潰食が発生する危険がない流量域では水比例弁14の開度を変更せずそのままの開度とするので、必要以上に出湯流量が制限されることがなくユーザの利便性を損なうことがないものであり、潰食が発生する危険がある流量以上に限って水比例弁14の開度をそれまでの開度よりも閉じる方向に制御することで、出湯流量が制限され、前記湯側流路を流通する水または湯の流速が下がるので、潰食の発生を抑制することができ、水比例弁14の開度の変更のみで熱交出口目標温度は変化しないことから、熱効率の良い状態での出湯が可能である。また、潰食が発生する危険がある流量以上を検出した場合に限って出湯流量が制限されるが、ユーザは意識的に省エネルギーな運転をさせようとエコモード設定にするものであるから、出湯流量の制限が節水という省エネ機能として認識され、利便性の損失はある程度許容されるものである。 From the above, when the detected flow rate detected by the flow rate sensor 11 reaches the erosion danger flow rate during the hot water discharge operation when the eco mode is set, the opening degree of the water proportional valve 14 is closed in the direction of closing more than the opening degree up to that point. By controlling it, in the flow rate range where there is no risk of erosion, the opening of the water proportional valve 14 is not changed and the opening is kept as it is, so that the flow rate of hot water is not restricted more than necessary. It does not impair the convenience of the user, and by controlling the opening of the water proportional valve 14 in the direction of closing more than the previous opening only when the flow rate is higher than the flow rate at which there is a risk of erosion, hot water is discharged. Since the flow rate is limited and the flow rate of the water or hot water flowing through the hot water side flow path is reduced, the occurrence of erosion can be suppressed, and the heat exchange outlet target temperature can be set only by changing the opening degree of the water proportional valve 14. Since it does not change, it is possible to discharge hot water with good thermal efficiency. In addition, the flow rate of hot water is limited only when the flow rate is higher than the flow rate at which there is a risk of erosion, but since the user intentionally sets the eco mode to save energy, the hot water is discharged. The limitation of the flow rate is recognized as an energy saving function of saving water, and the loss of convenience is tolerated to some extent.

また、エコモード設定時の出湯動作中において、水比例弁14の開度をそれまでの開度よりも閉じる方向に制御した後、その回の出湯動作中に、流量センサ11の検出流量が潰食危険流量から乖離する方向に小さくなり、水比例弁14の開度を閉じる方向に制御する前の元の開度に戻しても潰食危険流量未満であることが、制御手段25にて演算等により判断される場合は、制御手段25は、水比例弁14の開度を元の開度に戻すようにしてもよく、この場合、エコモード設定時の出湯動作中であっても、必要のない場合は、出湯流量が制限されることがないので、ユーザの利便性を損なうことがないものである。 Further, during the hot water discharge operation when the eco mode is set, after controlling the opening degree of the water proportional valve 14 in the direction of closing more than the previous opening degree, the detected flow rate of the flow rate sensor 11 is crushed during the hot water discharge operation at that time. The control means 25 calculates that the flow rate becomes smaller in the direction deviating from the dangerous erosion flow rate and is less than the dangerous erosion flow rate even if the opening degree of the water proportional valve 14 is returned to the original opening before being controlled in the closing direction. When it is determined by the above, the control means 25 may return the opening degree of the water proportional valve 14 to the original opening degree. In this case, it is necessary even during the hot water discharge operation when the eco mode is set. If there is no such, the flow rate of hot water is not limited, so that the convenience of the user is not impaired.

さらに、エコモード設定時の出湯動作中において、水比例弁14の開度をそれまでの開度よりも閉じる方向に制御した回の出湯が停止した場合、制御手段25は、水比例弁14の開度を閉じる方向に制御する前の元の開度に戻すようにしてもよく、この場合、次回の出湯動作開始時において、潰食の危険がない流量域にて出湯流量が制限されることがなく、ユーザの利便性を損なうことがないものである。 Further, when the hot water discharge operation in which the eco-mode is set and the opening degree of the water proportional valve 14 is controlled in a direction to be closed more than the previous opening degree is stopped, the control means 25 uses the water proportional valve 14 to perform the hot water discharge operation. The opening may be returned to the original opening before controlling the opening in the closing direction. In this case, the flow rate of the hot water is limited in the flow rate range where there is no risk of erosion at the start of the next hot water discharge operation. There is no such thing, and the convenience of the user is not impaired.

なお、本発明は先に説明した一実施形態に限定されるものではなく、本実施形態では、給湯栓3からの出湯および浴槽15への湯張りを行える給湯装置1において本発明を適用したが、給湯のみが行える単機能の給湯装置1において本発明を適用してもよく、浴槽水の追い焚き機能が付いた給湯装置1において本発明を適用してもよいものである。 The present invention is not limited to the one embodiment described above, and in the present embodiment, the present invention is applied to the hot water supply device 1 capable of discharging hot water from the hot water tap 3 and filling the bathtub 15. The present invention may be applied to a single-function hot water supply device 1 capable of only supplying hot water, or the present invention may be applied to a hot water supply device 1 having a function of reheating bath water.

また、本実施形態では、熱交換器5を流通する水を加熱する加熱手段として燃焼式のバーナ2を用いたが、熱交換器5を流通する水を加熱する加熱手段はヒートポンプ式の加熱手段であってもよく、特に限定されるものではない。 Further, in the present embodiment, the combustion type burner 2 is used as the heating means for heating the water flowing through the heat exchanger 5, but the heating means for heating the water flowing through the heat exchanger 5 is a heat pump type heating means. It may be, and is not particularly limited.

また、本実施形態では、エコモードが設定された場合、リモコン4の表示部24に表示される給湯設定温度は変更されることなく、給湯栓3から出湯される湯温を給湯設定温度よりも所定温度低くしたり、リモコン4の表示部24に表示される風呂設定温度は変更されることなく、浴槽15に注湯される湯温を風呂設定温度よりも所定温度低くしたり、リモコン4の表示部24に表示される設定湯張り量は変更されることなく、浴槽15に注湯される設定湯張り量よりも所定量少なくするという省エネな運転を行える制御例を挙げたが、これらだけに限定されるものではなく、通常時よりも燃料や水の使用量を低減させる省エネな運転を行わせることができるものであればよいものである。 Further, in the present embodiment, when the eco mode is set, the hot water supply set temperature displayed on the display unit 24 of the remote control 4 is not changed, and the hot water temperature discharged from the hot water tap 3 is set higher than the hot water supply set temperature. The temperature of the hot water poured into the bathtub 15 can be made lower than the set temperature of the bath without changing the set temperature of the bath displayed on the display unit 24 of the remote control 4 or lowering the predetermined temperature. A control example is given in which the set amount of hot water displayed on the display unit 24 is not changed and a predetermined amount is smaller than the set amount of hot water poured into the bathtub 15, which enables energy-saving operation. It is not limited to the above, and any one can be used as long as it can perform energy-saving operation that reduces the amount of fuel and water used as compared with the normal time.

1 給湯装置
2 バーナ
5 熱交換器
6 給水管
7 給湯管
8 バイパス管
9 混合弁
11 流量センサ
14 水比例弁
20 給湯温度設定スイッチ
21 風呂温度設定スイッチ
23 エコモードスイッチ
25 制御手段
1 Hot water supply device 2 Burner 5 Heat exchanger 6 Water supply pipe 7 Hot water supply pipe 8 Bypass pipe 9 Mixing valve 11 Flow sensor 14 Water proportional valve 20 Hot water supply temperature setting switch 21 Bath temperature setting switch 23 Eco mode switch 25 Control means

Claims (4)

給水管と、該給水管の下流に設けた熱交換器と、該熱交換器の下流に設けた給湯管と、前記熱交換器を流通する水を加熱する加熱手段と、前記給水管と前記給湯管とを接続し前記熱交換器をバイパスするバイパス管と、前記給湯管と前記バイパス管との接続部に設けられ前記熱交換器から流出された湯と前記バイパス管からの水とを混合する混合弁と、前記給水管と前記バイパス管との接続部よりも下流側の前記給水管に設けられ前記熱交換器に流入する水の流量を検出する流量検出手段と、出湯流量を制御する流量調整手段と、前記混合弁から出湯させる湯の温度を設定する出湯温度設定手段と、それらの作動を制御する制御手段とを備え、前記制御手段は、前記熱交換器から流出させる湯の熱交出口目標温度を予め定められた規定温度に設定し、前記熱交換器から流出される湯が前記規定温度となるように前記加熱手段を制御すると共に前記熱交換器からの前記規定温度の湯と前記バイパス管からの水とを前記出湯温度設定手段によって設定された出湯設定温度に基づく温度の湯となるように混合弁を制御して出湯させる出湯動作を行う給湯装置において、ユーザの選択操作により通常時よりもエネルギーを制限して省エネルギー運転を行うようエコモード設定するエコモード設定手段を設け、前記出湯動作中に、前記制御手段が、前記流量検出手段の検出する検出流量が潰食が発生するおそれのある潰食危険流量に達したと判断したら、前記エコモード設定手段によりエコモード設定がされていないかどうか判断し、前記エコモード設定がされていない場合は、前記制御手段は、前記熱交出口目標温度を前記規定温度よりも高い潰食防止温度に変更する一方、前記エコモード設定がされていた場合には、前記流量調整手段の開度をそれまでよりも閉じる方向に制御するようにしたこと特徴とする給湯装置。 A water supply pipe, a heat exchanger provided downstream of the water supply pipe, a hot water supply pipe provided downstream of the heat exchanger, a heating means for heating the water flowing through the heat exchanger, the water supply pipe and the above. A bypass pipe that connects to the hot water supply pipe and bypasses the heat exchanger, and hot water that is provided at the connection portion between the hot water supply pipe and the bypass pipe and flows out from the heat exchanger and water from the bypass pipe are mixed. A flow rate detecting means for detecting the flow rate of water flowing into the heat exchanger provided in the water supply pipe on the downstream side of the connection portion between the water supply pipe and the bypass pipe, and controlling the flow rate of hot water. The flow rate adjusting means, the hot water temperature setting means for setting the temperature of the hot water to be discharged from the mixing valve, and the control means for controlling the operation thereof are provided, and the control means is the heat of the hot water to be discharged from the heat exchanger. The target temperature at the exchange outlet is set to a predetermined specified temperature, the heating means is controlled so that the hot water flowing out from the heat exchanger reaches the specified temperature, and the hot water at the specified temperature from the heat exchanger is controlled. A user's selection operation in a hot water supply device that performs a hot water discharge operation by controlling a mixing valve so that the water from the bypass pipe and the water from the bypass pipe become hot water at a temperature based on the hot water set temperature set by the hot water temperature setting means. An eco-mode setting means for setting the eco-mode so as to perform energy-saving operation by limiting the energy from the normal time is provided, and the detected flow rate detected by the control means by the flow rate detecting means is eroded during the hot water discharge operation. When it is determined that the dangerous erosion flow rate that may occur is reached, it is determined whether or not the eco-mode is set by the eco-mode setting means, and if the eco-mode is not set, the control means is determined. While changing the heat exchange outlet target temperature to a erosion prevention temperature higher than the specified temperature, when the eco mode is set, the opening degree of the flow rate adjusting means is controlled in a direction to be closed more than before. A hot water supply device that is characterized by the fact that it is designed to be used. 前記流量検出手段の検出する検出流量が潰食が発生するおそれのある前記潰食危険流量に達したときであって、前記エコモード設定がされていない場合、前記制御手段は、前記流量検出手段で検出される検出流量が大きいほど前記潰食防止温度を高く設定するようにしたことを特徴とする請求項1記載の給湯装置。 When the detected flow rate detected by the flow rate detecting means reaches the erosion dangerous flow rate at which erosion may occur and the eco mode is not set, the control means is the flow rate detecting means. The hot water supply device according to claim 1, wherein the larger the detected flow rate detected in the above, the higher the erosion prevention temperature is set. 前記出湯動作中に前記熱交出口目標温度が前記潰食防止温度に変更された場合、前記制御手段は、その回の前記出湯動作が停止されるまでは前記熱交出口目標温度を前記潰食防止温度に維持するようにしたことを特徴とする請求項1または2に記載の給湯装置。 When the heat exchange outlet target temperature is changed to the erosion prevention temperature during the hot water discharge operation, the control means erodes the heat exchange outlet target temperature until the hot water discharge operation is stopped at that time. The hot water supply device according to claim 1 or 2, wherein the temperature is maintained at a preventive temperature. 前記出湯動作中に前記熱交出口目標温度が前記潰食防止温度に変更された回の出湯が停止した場合、前記制御手段は、前記熱交出口目標温度を前記規定温度に戻すようにしたことを特徴とする請求項1から3の何れか一項に記載の給湯装置。 When the hot water discharge is stopped at the time when the heat exchange outlet target temperature is changed to the erosion prevention temperature during the hot water discharge operation, the control means is set to return the heat exchange outlet target temperature to the specified temperature. The hot water supply device according to any one of claims 1 to 3, wherein the hot water supply device is characterized.
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