JP6341002B2 - Water heater - Google Patents

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JP6341002B2
JP6341002B2 JP2014172140A JP2014172140A JP6341002B2 JP 6341002 B2 JP6341002 B2 JP 6341002B2 JP 2014172140 A JP2014172140 A JP 2014172140A JP 2014172140 A JP2014172140 A JP 2014172140A JP 6341002 B2 JP6341002 B2 JP 6341002B2
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hot water
water supply
temperature sensor
water
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JP2016044958A (en
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命仁 王
命仁 王
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Daikin Industries Ltd
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Description

本発明は、給湯装置に関し、特に、給湯路における漏水対策に係るものである。   The present invention relates to a hot water supply apparatus, and particularly relates to measures against water leakage in a hot water supply path.

従来より、給湯装置の給湯路における漏水の発生を、温度センサを利用して検知することが知られている。例えば、特許文献1の給湯装置は、給湯路および温水循環路が設けられて両者の水を同時に加熱する加熱部と、給湯路の出口の水温を計測する給湯温度センサと、給湯路における水の流量を検出する流量検出手段とを備えている。給湯路は給湯栓に接続され、温水循環路は、浴槽との間で水を循環させるための温水回路に接続されている。給湯温度センサは、給湯栓から流れ出る水の温度(ユーザが利用する水の温度)を制御するために用いられる。   Conventionally, it is known to detect the occurrence of water leakage in a hot water supply path of a hot water supply device using a temperature sensor. For example, the hot water supply apparatus of Patent Document 1 is provided with a hot water supply path and a hot water circulation path to simultaneously heat both water, a hot water temperature sensor for measuring the water temperature at the outlet of the hot water supply path, and water in the hot water supply path And a flow rate detecting means for detecting the flow rate. The hot water supply path is connected to a hot water tap, and the hot water circulation path is connected to a hot water circuit for circulating water between the hot tub and the bathtub. The hot water temperature sensor is used to control the temperature of the water flowing out from the hot water tap (the temperature of the water used by the user).

ここで、給湯路では、例えば給湯栓が完全に閉まっていない等の原因によって、漏水が生じることがある。このような場合、給湯路から漏れる水の流量はわずかであり、流量検出手段で漏水の発生を検出するのが困難な場合がある。   Here, in the hot water supply path, water leakage may occur due to, for example, the hot water tap not being completely closed. In such a case, the flow rate of water leaking from the hot water supply passage is small, and it may be difficult to detect the occurrence of water leak by the flow rate detection means.

そこで、当該給湯装置は、給湯は行わずに温水回路での温水循環のみを行う間、流量検出手段が検知できない給湯路における漏水の発生を、給湯温度センサの計測値に基づいて判定する。すなわち、温水回路での温水循環のみを行う場合には、温水循環路の水を加熱するために加熱部が作動し、これにより給湯路の水も加熱される。給湯路で漏水が発生している場合には、この加熱された水が給湯温度センサの設置箇所に到達する。そして、特許文献1の給湯装置は、給湯温度センサの計測値が予め設定された閾値を超えたときに、給湯路における漏水が発生したものと判定する。   Therefore, the hot water supply apparatus determines the occurrence of water leakage in the hot water supply path that cannot be detected by the flow rate detection means based on the measured value of the hot water supply temperature sensor while only performing hot water circulation in the hot water circuit without supplying hot water. That is, when only the hot water circulation in the hot water circuit is performed, the heating unit operates to heat the water in the hot water circulation path, thereby heating the water in the hot water supply path. When water leaks in the hot water supply path, the heated water reaches the installation location of the hot water temperature sensor. And the hot-water supply apparatus of patent document 1 determines with the water leak in the hot-water supply path having occurred, when the measured value of the hot-water supply temperature sensor exceeds the preset threshold value.

特開平5−302753号公報JP-A-5-302753

ところで、特許文献1の給湯装置では、給湯温度センサの計測値が閾値を超えない限り、給湯路における漏水の発生は検出されない。すなわち、例えば温水利用機器で利用される水の温度が比較的低い場合には、加熱部の加熱量が比較的少ないために給湯路の水はさほど高温にならない。その結果、給湯路で漏水が発生していても給湯温度センサの計測値が閾値を超えず、漏水の発生が検出されないおそれがある。このように、特許文献1の給湯装置では、その運転条件によっては給湯路における漏水の発生を正しく検出できないおそれがある。   By the way, in the hot-water supply apparatus of patent document 1, generation | occurrence | production of the water leak in a hot-water supply path is not detected unless the measured value of the hot-water supply temperature sensor exceeds a threshold value. That is, for example, when the temperature of the water used in the hot water utilization device is relatively low, the amount of heat in the heating unit is relatively small, so that the water in the hot water supply path does not become so high. As a result, even if water leakage occurs in the hot water supply channel, the measured value of the hot water temperature sensor does not exceed the threshold value, and there is a possibility that the occurrence of water leakage is not detected. Thus, in the hot water supply device of Patent Document 1, there is a possibility that the occurrence of water leakage in the hot water supply path cannot be detected correctly depending on the operating conditions.

本発明は、かかる点に鑑みてなされたものであり、その目的は、給湯装置の運転条件によらず給湯路における漏水の発生を検出できるようにすることにある。   This invention is made | formed in view of this point, The objective is to enable it to detect generation | occurrence | production of the water leak in a hot water supply path irrespective of the operating condition of a hot water supply apparatus.

第1の発明は、給湯栓(25)に接続されて水が流れる給湯路(15)、および、温水利用機器(34)との間で水を循環させるための温水回路(30)に接続される温水循環路(16)が設けられ、上記給湯路(15)および上記温水循環路(16)の水を同時に加熱する加熱部(14,17)と、上記温水利用機器(34)の運転中に上記温水回路(30)の水を循環させる循環ポンプ(35)とを備える給湯装置(10)を対象とする。   1st invention is connected to the hot water circuit (30) for circulating water between the hot-water supply path (15) connected to the hot-water tap (25), and water flowing through, and a hot-water utilization apparatus (34) The hot water circulation path (16) is provided, and the heating section (14, 17) for simultaneously heating the water in the hot water supply path (15) and the warm water circulation path (16) and the hot water utilization device (34) are in operation. A hot water supply device (10) provided with a circulation pump (35) for circulating the water of the hot water circuit (30).

そして、本発明に係る給湯装置(10)は、上記給湯路(15)における水の流量が基準流量以上である流動状態か否かを検知する流動検知部(51)と、上記流動検知部(51)が流動状態を検知している間は上記循環ポンプ(35)の作動を禁止し、上記流動検知部(51)が流動状態を検知していない間は上記循環ポンプ(35)の作動を許可するポンプ制御部(61)と、上記流動検知部(51)が流動状態を検知しているかまたは上記循環ポンプ(35)が作動している間は上記加熱部(14,17)を作動させ、上記流動検知部(51)が流動状態を検知しておらずかつ上記循環ポンプ(35)が停止している間は上記加熱部(14,17)を作動させない加熱制御部(62)と、上記加熱部(14,17)の上記給湯路(15)の出口の水温を計測する給湯温度センサ(52)と、上記加熱部(14,17)の上記温水循環路(16)の出口の水温を計測する循環水温度センサ(53)と、上記循環ポンプ(35)の作動中に、上記給湯温度センサ(52)および上記循環水温度センサ(53)の計測値に基づいて上記給湯路(15)における漏水の発生を判定する漏水判定部(63)とをさらに備えていることを特徴とする。   And the hot water supply device (10) according to the present invention includes a flow detection unit (51) for detecting whether or not the flow rate of water in the hot water supply channel (15) is in a flow state equal to or higher than a reference flow rate, and the flow detection unit ( 51) prohibits the operation of the circulation pump (35) while the flow state is detected, and operates the circulation pump (35) while the flow detection unit (51) does not detect the flow state. While the permitting pump control unit (61) and the flow detection unit (51) detect the flow state or the circulation pump (35) is operating, the heating unit (14, 17) is operated. A heating control unit (62) that does not operate the heating unit (14, 17) while the flow detection unit (51) does not detect the flow state and the circulation pump (35) is stopped; A hot water supply temperature sensor (52) for measuring the water temperature at the outlet of the hot water supply path (15) of the heating unit (14, 17), and the heating unit 14, 17) the circulating water temperature sensor (53) for measuring the water temperature at the outlet of the hot water circuit (16), and the hot water supply temperature sensor (52) and the circulating water during the operation of the circulating pump (35). A water leakage determination unit (63) for determining the occurrence of water leakage in the hot water supply channel (15) based on the measured value of the temperature sensor (53) is further provided.

第1の発明では、給湯温度センサ(52)および循環水温度センサ(53)の計測値に基づいて給湯路(15)における漏水の発生を判定する。具体的に、給湯を行わずに温水利用機器(34)の運転のみを行うときには、循環ポンプ(35)および加熱部(14,17)が作動する。このため、加熱部(14,17)では、温水循環路(16)の水だけでなく給湯路(15)の水も同時に加熱される。このとき、温水循環路(16)および温水回路(30)では水が循環しながら加熱されるので、温水循環路(16)の出口の水温、すなわち循環水温度センサ(53)の計測値は上昇する。一方、給湯路(15)では漏水が発生していない限り水が流れないので、給湯路(15)の出口の水温、すなわち給湯温度センサ(52)の計測値は安定している。しかし、給湯路(15)において漏水が発生している場合には、給湯路(15)から加熱された水が少量ずつ流れ出すので、給湯温度センサ(52)の計測値が上昇する。このように、漏水が生じている場合は、両センサ(52,53)の計測値に関連性があるので、これを利用して給湯路(15)における漏水の発生を判定することが可能である。なお、当該関連性は、加熱部(14,17)による加熱の強弱によらず存在するので、給湯装置(10)の運転条件によらず漏水の発生を検出することができる。   In 1st invention, generation | occurrence | production of the water leak in a hot water supply channel (15) is determined based on the measured value of the hot water supply temperature sensor (52) and a circulating water temperature sensor (53). Specifically, when only the hot water utilization device (34) is operated without supplying hot water, the circulation pump (35) and the heating unit (14, 17) are operated. For this reason, in a heating part (14,17), not only the water of a warm water circulation path (16) but the water of a hot water supply path (15) is heated simultaneously. At this time, since water is heated while circulating in the hot water circuit (16) and the hot water circuit (30), the water temperature at the outlet of the hot water circuit (16), that is, the measured value of the circulating water temperature sensor (53) increases. To do. On the other hand, since water does not flow in the hot water supply channel (15) unless water leaks, the water temperature at the outlet of the hot water supply channel (15), that is, the measured value of the hot water temperature sensor (52) is stable. However, when water leakage occurs in the hot water supply channel (15), the heated water flows out from the hot water supply channel (15) little by little, and the measured value of the hot water supply temperature sensor (52) increases. In this way, when water leakage occurs, the measured values of both sensors (52, 53) are related, and this can be used to determine the occurrence of water leakage in the hot water supply channel (15). is there. In addition, since the said relationship exists irrespective of the strength of the heating by a heating part (14,17), generation | occurrence | production of water leak is detectable irrespective of the operating condition of a hot water supply apparatus (10).

第2の発明は、上記第1の発明において、上記漏水判定部(63)は、上記給湯温度センサ(52)の計測値の変動傾向と上記循環水温度センサ(53)の計測値の変動傾向とが一致する状態が所定の基準時間に亘って継続すると、上記給湯路(15)における漏水が発生していると判定することを特徴とする。   In a second aspect based on the first aspect, the water leakage determination unit (63) is configured such that the measured value of the hot water supply temperature sensor (52) varies and the measured value of the circulating water temperature sensor (53) varies. When a state in which the two coincide with each other continues for a predetermined reference time, it is determined that water leakage has occurred in the hot water supply channel (15).

第2の発明では、給湯路(15)で漏水が発生している場合に、給湯路(15)の出口の水温の変動傾向と温水循環路(16)の出口の水温の変動傾向とが一致することを利用して、給湯路(15)における漏水の発生を検出する。すなわち、例えば、給湯温度センサ(52)および循環水温度センサ(53)の計測値が同様に上昇し、または同様に下降するといった状態が所定の基準時間に亘って継続した場合には、給湯路(15)と温水循環路(16)の両方において水が流れていると推定できる。そこで、この場合、漏水判定部(63)は、給湯路(15)における漏水が発生していると判定する。かかる変動傾向の一致は、給湯路(15)で漏水が発生していれば、加熱部(14,17)による加熱の強弱によらず生じるので、給湯装置(10)の運転条件によらず漏水の発生を検出することができる。   In the second invention, when water leakage occurs in the hot water supply passage (15), the fluctuation tendency of the water temperature at the outlet of the hot water supply passage (15) coincides with the fluctuation tendency of the water temperature at the outlet of the hot water circulation passage (16). The occurrence of water leakage in the hot water supply channel (15) is detected using this. That is, for example, when a state in which the measured values of the hot water temperature sensor (52) and the circulating water temperature sensor (53) rise or fall similarly continues for a predetermined reference time, It can be estimated that water flows in both (15) and the hot water circuit (16). Therefore, in this case, the water leakage determination unit (63) determines that water leakage has occurred in the hot water supply channel (15). This coincidence of fluctuation trends occurs regardless of the strength of heating by the heating section (14, 17) if water leakage occurs in the hot water supply channel (15). Can be detected.

第3の発明は、上記第2の発明において、上記漏水判定部(63)は、上記基準時間よりも短い所定の判定用時間における上記給湯温度センサ(52)の計測値の変動量と上記循環水温度センサ(53)の計測値の変動量との差が所定値以下である状態が上記基準時間に亘って継続すると、上記給湯路(15)における漏水が発生していると判定することを特徴とする。   In a third aspect based on the second aspect, the water leakage determination section (63) is configured such that the fluctuation amount of the measured value of the hot water supply temperature sensor (52) and the circulation in a predetermined determination time shorter than the reference time. When the state where the difference between the measured value of the water temperature sensor (53) and the fluctuation amount is not more than a predetermined value continues for the reference time, it is determined that water leakage has occurred in the hot water supply channel (15). Features.

第3の発明では、給湯路(15)で漏水が発生している場合に、給湯路(15)の出口の水温の単位時間当たりの変動量と温水循環路(16)の出口の水温の単位時間当たりの変動量とが近似することを利用して、給湯路(15)における漏水の発生を検出する。すなわち、両センサ(52,53)の計測値が所定の判定用時間中に略同じだけ変動する状態が所定の基準時間に亘って継続した場合に、給湯路(15)における漏水が発生していると判定する。   In the third invention, when water leakage occurs in the hot water supply passage (15), the fluctuation amount per unit time of the water temperature at the outlet of the hot water supply passage (15) and the unit of the water temperature at the outlet of the hot water circulation passage (16) The occurrence of water leakage in the hot water supply channel (15) is detected by utilizing the approximation of the fluctuation amount per hour. That is, when a state where the measured values of both sensors (52, 53) fluctuate by substantially the same during a predetermined determination time continues for a predetermined reference time, water leakage occurs in the hot water supply channel (15). It is determined that

第4の発明は、上記第1の発明において、上記漏水判定部(63)は、上記給湯温度センサ(52)の計測値が上記循環水温度センサ(53)の計測値よりも高い状態が所定の基準時間に亘って継続すると、上記給湯路(15)における漏水が発生していると判定することを特徴とする。   In a fourth aspect based on the first aspect, the water leakage determination unit (63) is configured such that the measured value of the hot water supply temperature sensor (52) is higher than the measured value of the circulating water temperature sensor (53). If it continues over this reference time, it will determine with the water leak in the said hot-water supply path (15) having generate | occur | produced.

第4の発明では、給湯路(15)で漏水が発生していると、給湯路(15)の出口の水温と温水循環路(16)の出口の水温よりも高くなることを利用して、給湯路(15)における漏水の発生を検出する。すなわち、給湯路(15)で漏水が発生しているときは、給湯路(15)における水の流量が温水循環路(16)における水の流量よりも少ない。このため、加熱部(14,17)が給湯路(15)および温水循環路(16)の水を同時に加熱すると、給湯路(15)の出口の水温が温水循環路(16)の出口の水温よりも高くなる。そこで、漏水判定部(63)は、この現象を利用して漏水の発生を検出する。かかる現象は、給湯路(15)で漏水が発生していれば、加熱部(14,17)による加熱の強弱によらず生じるので、給湯装置(10)の運転条件によらず漏水の発生を検出することができる。   In 4th invention, when water leakage has generate | occur | produced in the hot water supply path (15), using the fact that the water temperature at the outlet of the hot water supply path (15) and the water temperature at the outlet of the hot water circulation path (16) become higher, Detects the occurrence of water leakage in the hot water supply channel (15). That is, when water leakage occurs in the hot water supply channel (15), the flow rate of water in the hot water supply channel (15) is smaller than the flow rate of water in the hot water circulation channel (16). For this reason, when the heating unit (14, 17) simultaneously heats the water in the hot water supply passage (15) and the hot water circulation passage (16), the water temperature at the outlet of the hot water supply passage (15) becomes the water temperature at the outlet of the hot water circulation passage (16). Higher than. Therefore, the water leakage determination unit (63) detects the occurrence of water leakage using this phenomenon. This phenomenon occurs regardless of the intensity of heating by the heating section (14, 17) if water leakage occurs in the hot water supply channel (15). Therefore, the occurrence of water leakage occurs regardless of the operating conditions of the water heater (10). Can be detected.

第5の発明は、上記第1の発明において、上記漏水判定部(63)は、上記加熱部(14,17)の上記給湯路(15)の出口の水温の目標値が上記加熱部(14,17)の上記温水循環路(16)の出口の水温の目標値よりも低く、かつ上記給湯温度センサ(52)の計測値が上記循環水温度センサ(53)の計測値よりも高い状態が所定の基準時間に亘って継続すると、上記給湯路(15)における漏水が発生していると判定することを特徴とする。   In a fifth aspect based on the first aspect, the water leakage determination unit (63) is configured such that the target value of the water temperature at the outlet of the hot water supply path (15) of the heating unit (14, 17) is the heating unit (14 17) is lower than the target value of the water temperature at the outlet of the hot water circuit (16), and the measured value of the hot water temperature sensor (52) is higher than the measured value of the circulating water temperature sensor (53). If it continues over a predetermined reference time, it is determined that water leakage has occurred in the hot water supply channel (15).

第5の発明では、給湯路(15)で漏水が発生していると、給湯路(15)の出口の水温と温水循環路(16)の出口の水温よりも高くなることを利用して、給湯路(15)における漏水の発生を検出する。さらに、給湯路(15)の出口および温水循環路(16)の出口の水温の目標値を考慮することで、給湯路(15)における漏水発生の誤検出を防止する。すなわち、給湯路(15)の出口の水温の目標値が温水循環路(16)の出口の水温の目標値よりも高い場合には、給湯が終了してからしばらくの間は、給湯中に加熱された水が給湯路(15)の出口付近に滞留しているため、たとえ給湯路(15)で漏水が発生していなくても、給湯温度センサ(52)の計測値は循環水温度センサ(53)の計測値よりも高くなる。一方、給湯路(15)の出口の水温の目標値が温水循環路(16)の出口の水温の目標値よりも低い場合には、給湯路(15)で漏水が発生しない限り、給湯温度センサ(52)の計測値が循環水温度センサ(53)の計測値よりも高くなることはない。よって、後者の場合に限って、両センサ(52,53)の計測値に基づいて漏水発生を判定することにより、漏水発生の誤検出を確実に防止することができる。   In 5th invention, when water leakage has occurred in the hot water supply passage (15), the water temperature at the outlet of the hot water supply passage (15) and the water temperature at the outlet of the hot water circulation passage (16) become higher. Detects the occurrence of water leakage in the hot water supply channel (15). Further, by taking into account the target values of the water temperature at the outlet of the hot water supply passage (15) and the outlet of the hot water circulation passage (16), erroneous detection of occurrence of water leakage in the hot water supply passage (15) is prevented. In other words, if the target water temperature at the outlet of the hot water supply passage (15) is higher than the target water temperature at the outlet of the hot water circulation passage (16), the water is heated for a while after the hot water supply ends. Since the water collected is near the outlet of the hot water supply channel (15), the measured value of the hot water temperature sensor (52) is measured even if there is no water leakage in the hot water supply channel (15). 53) higher than the measured value. On the other hand, if the target value of the water temperature at the outlet of the hot water supply passage (15) is lower than the target value of the water temperature at the outlet of the hot water circulation passage (16), a hot water supply temperature sensor is used as long as no water leakage occurs in the hot water supply passage (15). The measured value of (52) does not become higher than the measured value of the circulating water temperature sensor (53). Therefore, only in the latter case, it is possible to reliably prevent erroneous detection of the occurrence of water leakage by determining the occurrence of water leakage based on the measured values of both sensors (52, 53).

第6の発明は、上記第1〜第5の発明のいずれか1つにおいて、上記漏水判定部(63)が給湯路(15)における漏水の発生を判定すると、ユーザに漏水の発生を報知する報知部(19,64)をさらに備えていることを特徴とする。   In a sixth aspect of the present invention, in any one of the first to fifth aspects, when the water leakage determination unit (63) determines the occurrence of water leakage in the hot water supply channel (15), the user is notified of the occurrence of water leakage. It is further provided with a notification unit (19, 64).

第6の発明では、給湯路(15)で漏水が発生すると、報知部(19,64)によりユーザに漏水の発生が報知される。これにより、ユーザは、漏水に対して素早く対処することができる。   In the sixth invention, when water leakage occurs in the hot water supply channel (15), the notification unit (19, 64) notifies the user of the occurrence of water leakage. Thereby, the user can cope with water leakage quickly.

本発明によれば、給湯路(15)で漏水が発生している場合、給湯温度センサ(52)の計測値と循環水温度センサ(53)の計測値とに関連性があることを利用して、給湯路(15)における漏水の発生を判定することができる。当該関連性は、加熱部(14,17)による加熱の強弱によらず存在するので、給湯装置(10)の運転条件によらず漏水の発生を検出することができる。   According to the present invention, when water leakage has occurred in the hot water supply channel (15), the measured value of the hot water temperature sensor (52) and the measured value of the circulating water temperature sensor (53) are related. Thus, occurrence of water leakage in the hot water supply channel (15) can be determined. Since the relationship exists irrespective of the strength of heating by the heating unit (14, 17), the occurrence of water leakage can be detected regardless of the operating conditions of the hot water supply device (10).

また、上記第2および第3の発明によれば、給湯路(15)で漏水が発生している場合、給湯路(15)の出口の水温の変動傾向と温水循環路(16)の出口の水温の変動傾向とが一致することを利用して、給湯路(15)における漏水の発生を判定することができる。かかる変動傾向の一致は、加熱部(14,17)による加熱の強弱によらず生じるので、給湯装置(10)の運転条件によらず漏水の発生を検出することができる。   Further, according to the second and third aspects of the present invention, when water leaks in the hot water supply passage (15), the fluctuation tendency of the water temperature at the outlet of the hot water supply passage (15) and the outlet of the hot water circulation passage (16). The occurrence of water leakage in the hot water supply channel (15) can be determined using the fact that the fluctuation tendency of the water temperature matches. Since the coincidence of such fluctuation trends occurs regardless of the intensity of heating by the heating section (14, 17), the occurrence of water leakage can be detected regardless of the operating conditions of the hot water supply device (10).

また、上記第4および第5の発明によれば、給湯路(15)で漏水が発生している場合、給湯路(15)の出口の水温が温水循環路(16)の出口の水温よりも高くなる現象を利用して、給湯路(15)における漏水の発生を検出できる。かかる現象は、加熱部(14,17)による加熱の強弱によらず生じるので、給湯装置(10)の運転条件によらず漏水の発生を検出することができる。また、第5の発明によれば、給湯路(15)における漏水発生の誤検出を確実に防止することができる。   According to the fourth and fifth inventions described above, when water leakage occurs in the hot water supply passage (15), the water temperature at the outlet of the hot water supply passage (15) is higher than the water temperature at the outlet of the hot water circulation passage (16). Using the phenomenon of increasing, it is possible to detect the occurrence of water leakage in the hot water supply channel (15). Since such a phenomenon occurs regardless of the strength of heating by the heating unit (14, 17), the occurrence of water leakage can be detected regardless of the operating conditions of the hot water supply device (10). Moreover, according to 5th invention, the misdetection of water leak generation | occurrence | production in a hot water supply channel (15) can be prevented reliably.

また、上記第6の発明によれば、給湯路(15)における漏水の発生を報知部(19,64)がユーザに報知するので、ユーザは、漏水に対して素早く対処することができる。このため、給湯装置(10)の安全性を向上させることができる。   Moreover, according to the said 6th invention, since a alerting | reporting part (19,64) alert | reports generation | occurrence | production of the water leak in a hot water supply path (15) to a user, the user can cope with a water leak quickly. For this reason, the safety of the hot water supply device (10) can be improved.

図1は、本発明の実施形態に係る給湯装置の概略構成図である。FIG. 1 is a schematic configuration diagram of a hot water supply apparatus according to an embodiment of the present invention. 図2は、給湯装置のシステム構成を示す図である。FIG. 2 is a diagram illustrating a system configuration of the hot water supply apparatus. 図3は、給湯動作における水の流れを示す給湯装置の概略構成図である。FIG. 3 is a schematic configuration diagram of a hot water supply apparatus showing a flow of water in the hot water supply operation. 図4は、暖房動作における水の流れを示す給湯装置の概略構成図である。FIG. 4 is a schematic configuration diagram of a hot water supply device showing the flow of water in the heating operation.

本発明の実施形態を図面に基づいて詳細に説明する。なお、以下の実施形態は、本質的に好ましい例示であって、本発明、その適用物、あるいはその用途の範囲を制限することを意図するものではない。   Embodiments of the present invention will be described in detail with reference to the drawings. The following embodiments are essentially preferable examples, and are not intended to limit the scope of the present invention, its application, or its use.

《発明の実施形態1》
図1は、本発明の実施形態1に係る給湯装置(10)の概略を示す図である。同図に示すように、給湯装置(10)は、筐体(11)と、この筐体(11)の内部に設けられた熱交換器(14)と、この熱交換器(14)の近傍に設けられたバーナ(17)と、熱交換器(14)が接続される給湯通路(20)および温水回路(30)と、循環ポンプ(35)と、流量センサ(51)と、給湯温度センサ(52)と、循環水温度センサ(53)と、コントローラ(60)とを備えている。熱交換器(14)およびバーナ(17)は、加熱部を構成している。
Embodiment 1 of the Invention
FIG. 1 is a diagram showing an outline of a hot water supply device (10) according to Embodiment 1 of the present invention. As shown in the figure, the hot water supply device (10) includes a housing (11), a heat exchanger (14) provided in the housing (11), and the vicinity of the heat exchanger (14). , A hot water supply passage (20) and a hot water circuit (30) to which a heat exchanger (14) is connected, a circulation pump (35), a flow rate sensor (51), and a hot water supply temperature sensor (52), a circulating water temperature sensor (53), and a controller (60). The heat exchanger (14) and the burner (17) constitute a heating unit.

筐体(11)は箱体に形成されていて、その外面部に、第1および第4給湯接続部(12a,12d)と、第1および第4循環接続部(13a,13d)とを有している。   The housing (11) is formed in a box and has first and fourth hot water supply connection portions (12a, 12d) and first and fourth circulation connection portions (13a, 13d) on its outer surface. doing.

熱交換器(14)は、第2および第3給湯接続部(12b,12c)と、第2および第3循環接続部(13b,13c)とを有している。また、熱交換器(14)は、給湯路(15)と温水循環路(16)とを有している。給湯路(15)は、一端が第2給湯接続部(12b)に接続されかつ他端が第3給湯接続部(12c)に接続されて、熱交換器(14)の内部を蛇行して延びている。給湯路(15)は、第2および第3給湯接続部(12b,12c)を介して給湯通路(20)に接続されている。温水循環路(16)は、一端が第2循環接続部(13b)に接続されかつ他端が第3循環接続部(13c)に接続されて、熱交換器(14)の内部を蛇行して延びている。温水循環路(16)は、第2および第3循環接続部(13b,13c)を介して温水回路(30)に接続されている。   The heat exchanger (14) has second and third hot water supply connections (12b, 12c) and second and third circulation connections (13b, 13c). Moreover, the heat exchanger (14) has a hot water supply channel (15) and a hot water circulation channel (16). The hot water supply path (15) has one end connected to the second hot water supply connection part (12b) and the other end connected to the third hot water supply connection part (12c), and extends in a meandering manner inside the heat exchanger (14). ing. The hot water supply passage (15) is connected to the hot water supply passage (20) via the second and third hot water supply connection portions (12b, 12c). One end of the hot water circulation path (16) is connected to the second circulation connection portion (13b) and the other end is connected to the third circulation connection portion (13c), and the inside of the heat exchanger (14) is meandered. It extends. The hot water circuit (16) is connected to the hot water circuit (30) via the second and third circulation connections (13b, 13c).

バーナ(17)は、外部から供給された天然ガス等の燃料ガスを燃焼させることにより、熱交換器(14)の給湯路(15)および温水循環路(16)を流れる水を同時に加熱するためのものである。バーナ(17)に対する燃料ガスの供給量は、ガス流量制御弁(18)により調節される。   The burner (17) simultaneously heats the water flowing through the hot water supply passage (15) and the hot water circulation passage (16) of the heat exchanger (14) by burning fuel gas such as natural gas supplied from the outside. belongs to. The amount of fuel gas supplied to the burner (17) is adjusted by the gas flow control valve (18).

給湯通路(20)は、図示しない上水道から後述する給湯栓(25)まで水を流すためのものであって、外部給水管(21)および内部給水管(22)と、内部給湯管(23)および外部給湯管(24)とを有している。   The hot water supply passage (20) is for flowing water from a water supply (not shown) to a hot water tap (25) to be described later, and includes an external water supply pipe (21), an internal water supply pipe (22), and an internal hot water supply pipe (23). And an external hot water supply pipe (24).

外部給水管(21)は、筐体(11)の外部に設けられていて、一端が第1給湯接続部(12a)に接続されかつ他端が上水道に接続されている。また、内部給水管(22)は、筐体(11)の内部に設けられていて、一端が第1給湯接続部(12a)に接続されかつ他端が第2給湯接続部(12b)に接続されている。つまり、外部給水管(21)、内部給水管(22)および給湯路(15)は、第1および第2給湯接続部(12a,12b)を介して互いに連通している。なお、外部給水管(21)の他端は井戸に接続されていてもよい。   The external water supply pipe (21) is provided outside the housing (11), and has one end connected to the first hot water supply connection part (12a) and the other end connected to the water supply. The internal water supply pipe (22) is provided inside the housing (11), and one end is connected to the first hot water supply connection part (12a) and the other end is connected to the second hot water supply connection part (12b). Has been. That is, the external water supply pipe (21), the internal water supply pipe (22), and the hot water supply passage (15) communicate with each other via the first and second hot water supply connection parts (12a, 12b). The other end of the external water supply pipe (21) may be connected to a well.

内部給湯管(23)は、筐体(11)の内部に設けられていて、一端が第3給湯接続部(12c)に接続されかつ他端が第4給湯接続部(12d)に接続されている。また、外部給湯管(24)は、筐体(11)の外部に設けられていて、一端が第4給湯接続部(12d)に接続されている。つまり、給湯路(15)、内部給湯管(23)および外部給湯管(24)は、第3および第4給湯接続部(12c,12d)を介して互いに連通している。また、外部給湯管(24)の他端には給湯栓(25)が取り付けられている。つまり、給湯路(15)は、内部給湯管(23)および外部給湯管(24)を介して給湯栓(25)に接続されている。   The internal hot water pipe (23) is provided inside the housing (11), and has one end connected to the third hot water supply connection part (12c) and the other end connected to the fourth hot water supply connection part (12d). Yes. The external hot water supply pipe (24) is provided outside the housing (11), and one end thereof is connected to the fourth hot water supply connection part (12d). That is, the hot water supply passage (15), the internal hot water supply pipe (23), and the external hot water supply pipe (24) communicate with each other via the third and fourth hot water supply connection portions (12c, 12d). A hot water tap (25) is attached to the other end of the external hot water pipe (24). That is, the hot water supply channel (15) is connected to the hot water tap (25) via the internal hot water supply pipe (23) and the external hot water supply pipe (24).

温水回路(30)は、熱交換器(14)と後述する床暖房ユニット(34)との間で水を循環させるためのものであって、外部循環路(31)と、第1および第2内部循環路(32,33)とを有している。   The hot water circuit (30) is for circulating water between the heat exchanger (14) and a floor heating unit (34) to be described later, and includes an external circulation path (31), first and second circuits. And an internal circulation path (32, 33).

外部循環路(31)は、筐体(11)の外部に設けられていて、一端が第1循環接続部(13a)に接続されかつ他端が第4循環接続部(13d)に接続されている。一方、第1内部循環路(32)は、筐体(11)の内部に設けられていて、一端が第1循環接続部(13a)に接続されかつ他端が第2循環接続部(13b)に接続されている。第2内部循環路(33)は、筐体(11)の内部に設けられていて、一端が第3循環接続部(13c)に接続されかつ他端が第4循環接続部(13d)に接続されている。つまり、外部循環路(31)、第1内部循環路(32)および第2内部循環路(33)は、第1および第4循環接続部(13a,13d)を介して互いに連通しており、これらを有する温水回路(30)は、第2および第3循環接続部(13b,13c)を介して熱交換器(14)の温水循環路(16)に接続されている。   The external circulation path (31) is provided outside the housing (11), and has one end connected to the first circulation connection part (13a) and the other end connected to the fourth circulation connection part (13d). Yes. On the other hand, the first internal circulation path (32) is provided in the housing (11), one end is connected to the first circulation connection part (13a) and the other end is the second circulation connection part (13b). It is connected to the. The second internal circulation path (33) is provided inside the housing (11), and has one end connected to the third circulation connection part (13c) and the other end connected to the fourth circulation connection part (13d). Has been. That is, the external circulation path (31), the first internal circulation path (32), and the second internal circulation path (33) communicate with each other via the first and fourth circulation connection portions (13a, 13d), The hot water circuit (30) having these is connected to the hot water circulation path (16) of the heat exchanger (14) via the second and third circulation connection portions (13b, 13c).

外部循環路(31)には、床暖房ユニット(34)が設けられている。この床暖房ユニット(34)は、内部を流通する温水の熱を利用して室内を暖めるためのものである。床暖房ユニット(34)は、温水利用機器を構成している。   A floor heating unit (34) is provided in the external circulation path (31). The floor heating unit (34) is for warming the room using the heat of hot water flowing through the inside. The floor heating unit (34) constitutes hot water use equipment.

循環ポンプ(35)は、上記第1内部循環路(32)に設けられている。この循環ポンプ(35)は、床暖房ユニット(34)の運転中に温水回路(30)の水を循環させるためのものである。   The circulation pump (35) is provided in the first internal circulation path (32). The circulation pump (35) is for circulating water in the hot water circuit (30) during operation of the floor heating unit (34).

流量センサ(51)は、上記内部給水管(22)に設けられている。この流量センサ(51)は、内部給水管(22)における水の流量、すなわち給湯路(15)における水の流量が基準流量(例えば、2L/min)以上である流動状態か否かを検知できるように構成されている。流量センサ(51)の検知結果はコントローラ(60)に送られる。流量センサ(51)は、流動検知部を構成している。   The flow sensor (51) is provided in the internal water supply pipe (22). The flow rate sensor (51) can detect whether or not the flow rate of water in the internal water supply pipe (22), that is, the flow rate of water in the hot water supply channel (15) is in a flow state that is equal to or higher than a reference flow rate (for example, 2 L / min). It is configured as follows. The detection result of the flow sensor (51) is sent to the controller (60). The flow sensor (51) constitutes a flow detection unit.

給湯温度センサ(52)は、内部給湯管(23)の第3給湯接続部(12c)寄り(図1で上寄り)、すなわち給湯路(15)の出口近傍に設けられていて、この給湯路(15)の出口の水温を計測できるように構成されている。給湯温度センサ(52)は、給湯路(15)の出口の水温を所定の判定用時間(例えば、5秒)毎に計測する。給湯温度センサ(52)の計測値はコントローラ(60)に送られる。なお、給湯温度センサ(52)は、給湯路(15)の出口の水温を計測できるのであれば、その他の位置に設けられていてもよい。   The hot water supply temperature sensor (52) is provided near the third hot water supply connection part (12c) (upward in FIG. 1) of the internal hot water supply pipe (23), that is, in the vicinity of the outlet of the hot water supply path (15). It is configured to measure the water temperature at the outlet of (15). The hot water supply temperature sensor (52) measures the water temperature at the outlet of the hot water supply passage (15) every predetermined time for determination (for example, 5 seconds). The measured value of the hot water temperature sensor (52) is sent to the controller (60). The hot water supply temperature sensor (52) may be provided at other positions as long as the water temperature at the outlet of the hot water supply passage (15) can be measured.

循環水温度センサ(53)は、第2内部循環路(33)の第3循環接続部(13c)寄り(図1で上寄り)、すなわち温水循環路(16)の出口近傍に設けられていて、この温水循環路(16)の出口の水温を計測できるように構成されている。循環水温度センサ(53)は、温水循環路(16)の出口の水温を所定の判定用時間(例えば、5秒)毎に計測する。循環水温度センサ(53)の計測値はコントローラ(60)に送られる。なお、循環水温度センサ(53)は、温水循環路(16)の出口の水温を計測できるのであれば、その他の位置に設けられていてもよい。   The circulating water temperature sensor (53) is provided near the third circulation connecting portion (13c) of the second internal circulation path (33) (upward in FIG. 1), that is, near the outlet of the hot water circulation path (16). The water temperature at the outlet of the hot water circuit (16) can be measured. The circulating water temperature sensor (53) measures the water temperature at the outlet of the hot water circuit (16) every predetermined time for determination (for example, 5 seconds). The measured value of the circulating water temperature sensor (53) is sent to the controller (60). The circulating water temperature sensor (53) may be provided at other positions as long as it can measure the water temperature at the outlet of the hot water circuit (16).

コントローラ(60)は、給湯装置(10)の動作を制御するためのものである。このコントローラ(60)は、図2に示すように、ポンプ制御部(61)と、加熱制御部(62)と、漏水判定部(63)と、警報発生部(64)と、強制停止部(65)とを有している。   The controller (60) is for controlling the operation of the hot water supply device (10). As shown in FIG. 2, the controller (60) includes a pump control unit (61), a heating control unit (62), a water leakage determination unit (63), an alarm generation unit (64), a forced stop unit ( 65).

ポンプ制御部(61)は、流量センサ(51)の検知結果等に基づいて循環ポンプ(35)の動作を制御する。すなわち、ポンプ制御部(61)は、流量センサ(51)が流動状態を検知している間は循環ポンプ(35)の作動を禁止し、流量センサ(51)が流動状態を検知していない間は循環ポンプ(35)の作動を許可する。また、ポンプ制御部(61)は、室内の暖房要求に応じて床暖房ユニット(34)を運転するとき、温水回路(30)の水を循環させるために循環ポンプ(35)を作動させる。つまり、ポンプ制御部(61)は、循環ポンプ(35)の作動が許可されており、かつ床暖房ユニット(34)の運転要求があるときに、循環ポンプ(35)を作動させる。   The pump control unit (61) controls the operation of the circulation pump (35) based on the detection result of the flow sensor (51) and the like. That is, the pump control unit (61) prohibits the operation of the circulation pump (35) while the flow sensor (51) is detecting the flow state, while the flow sensor (51) is not detecting the flow state. Allows the operation of the circulation pump (35). The pump control unit (61) operates the circulation pump (35) to circulate the water in the hot water circuit (30) when operating the floor heating unit (34) in response to a room heating request. That is, the pump control unit (61) operates the circulation pump (35) when the operation of the circulation pump (35) is permitted and there is an operation request for the floor heating unit (34).

加熱制御部(62)は、流量センサ(51)の検知結果と、循環ポンプ(35)の動作状態と、給湯温度センサ(52)および循環水温度センサ(53)の計測値とに基づいてガス流量制御弁(18)の開度を調節する。すなわち、加熱制御部(62)は、流量センサ(51)が流動状態を検知しているかまたは循環ポンプ(35)が作動している間は、ガス流量制御弁(18)を開いてバーナ(17)で燃料ガスを燃焼させる。ここで、加熱制御部(62)は、流量センサ(51)が流動状態を検知している場合、給湯温度センサ(52)の計測値が予め設定された目標値となるように、バーナ(17)に対する燃料ガスの供給量を調節する。また、加熱制御部(62)は、循環ポンプ(35)が作動している場合、循環水温度センサ(53)の計測値が予め設定された目標値となるように、バーナ(17)に対する燃料ガスの供給量を調節する。一方、加熱制御部(62)は、流量センサ(51)が流動状態を検知しておらずかつ循環ポンプ(35)が停止している間は、ガス流量制御弁(18)を閉じてバーナ(17)を燃焼させない。   The heating control unit (62) generates gas based on the detection result of the flow sensor (51), the operating state of the circulation pump (35), and the measured values of the hot water supply temperature sensor (52) and the circulating water temperature sensor (53). Adjust the opening of the flow control valve (18). That is, the heating control section (62) opens the gas flow control valve (18) and opens the burner (17) while the flow sensor (51) detects the flow state or the circulation pump (35) is operating. ) To burn the fuel gas. Here, when the flow rate sensor (51) detects the flow state, the heating control unit (62) allows the burner (17) so that the measured value of the hot water supply temperature sensor (52) becomes a preset target value. ) To adjust the fuel gas supply. The heating control unit (62) also controls the fuel for the burner (17) so that the measured value of the circulating water temperature sensor (53) becomes a preset target value when the circulation pump (35) is operating. Adjust the gas supply. On the other hand, the heating control unit (62) closes the gas flow control valve (18) and burner (50) while the flow sensor (51) does not detect the flow state and the circulation pump (35) is stopped. 17) Do not burn.

漏水判定部(63)は、循環ポンプ(35)の作動中に、給湯温度センサ(52)および循環水温度センサ(53)の計測値に基づいて給湯路(15)における漏水の発生を判定する。   The water leakage determination unit (63) determines the occurrence of water leakage in the hot water supply channel (15) based on the measured values of the hot water temperature sensor (52) and the circulating water temperature sensor (53) during the operation of the circulation pump (35). .

警報発生部(64)は、漏水判定部(63)が給湯路(15)における漏水の発生を判定すると、ユーザに対する警報を発生する。具体的に、警報発生部(64)は、漏水発生の判定がされると、漏水の発生をユーザに報知するための警報をブザー(19)により発生させる。警報発生部(64)およびブザー(19)は、報知部を構成している。なお、警報発生部(64)は、漏水発生をユーザに知らせるためのメッセージを図示しない表示パネルに表示してもよいし、図示しないランプを点滅させることにより漏水発生をユーザに知らせてもよい。   The alarm generation unit (64) generates an alarm to the user when the water leakage determination unit (63) determines the occurrence of water leakage in the hot water supply channel (15). Specifically, when the occurrence of water leakage is determined, the alarm generation unit (64) causes the buzzer (19) to generate an alarm for notifying the user of the occurrence of water leakage. The alarm generation unit (64) and the buzzer (19) constitute a notification unit. The alarm generation unit (64) may display a message for notifying the user of the occurrence of water leakage on a display panel (not shown), or may notify the user of the occurrence of water leakage by blinking a lamp (not shown).

強制停止部(65)は、上記警報発生部(64)によりユーザに漏水発生を知らせた後に所定の待機時間が経過しても漏水が止まらない場合に、給湯装置(10)の運転を強制停止させる。具体的に、強制停止部(65)は、ブザー(19)から警報を発生させた後、所定の待機時間(例えば、5分)が経過しても給湯路(15)における漏水が続いているならば、ガス流量制御弁(18)を閉じてバーナ(17)における燃焼を中止させると共に、循環ポンプ(35)を停止させる。   The forced stop unit (65) forcibly stops the operation of the hot water supply device (10) if the leak does not stop even after a specified waiting time has elapsed after the alarm generation unit (64) has notified the user of the occurrence of water leak Let Specifically, after the forced stop unit (65) generates an alarm from the buzzer (19), water leakage in the hot water supply channel (15) continues even after a predetermined waiting time (for example, 5 minutes) has elapsed. If so, the gas flow control valve (18) is closed to stop the combustion in the burner (17), and the circulation pump (35) is stopped.

−運転動作−
次に、本実施形態に係る給湯装置(10)の運転動作について説明する。この給湯装置(10)では、ユーザの要求に応じて、給湯動作および暖房動作のいずれかが行われる。
-Driving action-
Next, the operation of the hot water supply device (10) according to this embodiment will be described. In the hot water supply device (10), either a hot water supply operation or a heating operation is performed according to a user's request.

〈給湯動作〉
給湯動作は、上水道から流入した水を、加熱した後にユーザに供給するものである。図3に示すように、この動作では、ユーザが給湯栓(25)を開けることにより、上水道から外部給水管(21)を流れて内部給水管(22)に水が流入する。このとき、流量センサ(51)が流動状態を検知し、当該検知結果を受けた加熱制御部(62)によりガス流量制御弁(18)が開かれ、バーナ(17)が燃焼する。内部給水管(22)から給湯路(15)に流入した水はバーナ(17)により加熱される。このとき、加熱制御部(62)は、給湯温度センサ(52)の計測値が所定の目標値(例えば、60℃)となるように、バーナ(17)に対する燃料ガスの供給量を調節する。そして、加熱された水は、内部給湯管(23)および外部給湯管(24)を流れて給湯栓(25)からユーザに供給される。
<Hot-water supply operation>
In the hot water supply operation, the water flowing in from the water supply is heated and then supplied to the user. As shown in FIG. 3, in this operation, when the user opens the hot-water tap (25), water flows from the water supply through the external water supply pipe (21) to the internal water supply pipe (22). At this time, the flow rate sensor (51) detects the flow state, the heating control unit (62) receiving the detection result opens the gas flow rate control valve (18), and the burner (17) burns. Water flowing into the hot water supply channel (15) from the internal water supply pipe (22) is heated by the burner (17). At this time, the heating control unit (62) adjusts the amount of fuel gas supplied to the burner (17) so that the measured value of the hot water supply temperature sensor (52) becomes a predetermined target value (for example, 60 ° C.). Then, the heated water flows through the internal hot water supply pipe (23) and the external hot water supply pipe (24) and is supplied to the user from the hot water tap (25).

なお、給湯動作を行っている間、すなわち流量センサ(51)が流動状態を検知している間は、ポンプ制御部(61)により循環ポンプ(35)の作動が禁止される。   During the hot water supply operation, that is, while the flow rate sensor (51) detects the flow state, the pump controller (61) prohibits the operation of the circulation pump (35).

〈暖房動作〉
暖房動作は、温水回路(30)で水を加熱しながら循環させることにより、床暖房ユニット(34)で室内の暖房を行うものである。また、暖房動作は、給湯動作を行っていないとき、すなわち流量センサ(51)が流動状態を検知しておらず、ポンプ制御部(61)により循環ポンプ(35)の作動が許可されているときに限り行うことができる。図4に示すように、この動作では、室内の暖房要求に応じて、ポンプ制御部(61)により循環ポンプ(35)が作動し、温水回路(30)および温水循環路(16)を水が循環する。また、循環ポンプ(35)が作動している間は、加熱制御部(62)によりガス流量制御弁(18)が開かれ、バーナ(17)が燃焼する。このとき、加熱制御部(62)は、循環水温度センサ(53)の計測値が所定の目標値(例えば、80℃)となるように、バーナ(17)に対する燃料ガスの供給量を調節する。これにより、温水循環路(16)において水が加熱されると共に、温水回路(30)および温水循環路(16)を加熱された水が循環する。そして、床暖房ユニット(34)は、内部を流通する温水の熱を利用して室内を暖める。
<Heating operation>
In the heating operation, the floor heating unit (34) heats the room by circulating water while heating it in the hot water circuit (30). In addition, the heating operation is performed when the hot water supply operation is not performed, that is, when the flow rate sensor (51) does not detect the flow state and the operation of the circulation pump (35) is permitted by the pump control unit (61). Can only be done. As shown in FIG. 4, in this operation, the circulation pump (35) is operated by the pump control unit (61) in response to a request for heating in the room, and water flows through the hot water circuit (30) and the hot water circuit (16). Circulate. Further, while the circulation pump (35) is in operation, the gas flow control valve (18) is opened by the heating controller (62), and the burner (17) is burned. At this time, the heating controller (62) adjusts the amount of fuel gas supplied to the burner (17) so that the measured value of the circulating water temperature sensor (53) becomes a predetermined target value (for example, 80 ° C.). . Thereby, water is heated in the hot water circuit (16), and the heated water circulates in the hot water circuit (30) and the hot water circuit (16). Then, the floor heating unit (34) warms the room using the heat of the hot water circulating inside.

ここで、暖房動作中に、給湯路(15)において漏水が発生していると、上述のとおり、給湯装置(10)の運転条件によらず、漏水判定部(63)により当該漏水の発生が検出される。漏水の発生が検出されると、警報発生部(64)により、漏水発生をユーザに知らせるための警報がブザー(19)から発生する。そして、ユーザの対処により警報発生から所定の待機時間が経過するまでに漏水が止まると、ブザー(19)が止まって暖房動作が継続して行われる。一方、警報発生から所定の待機時間が経過しても漏水が続いていれば、強制停止部(65)により、バーナ(17)における燃焼が中止されると共に、循環ポンプ(35)が停止される。   Here, if water leakage occurs in the hot water supply channel (15) during the heating operation, the water leakage determination unit (63) generates the water leakage regardless of the operating conditions of the hot water supply device (10) as described above. Detected. When the occurrence of water leakage is detected, an alarm for informing the user of the occurrence of water leakage is generated from the buzzer (19) by the alarm generation unit (64). Then, when the leakage of water stops by the user's response until the predetermined waiting time elapses after the alarm is generated, the buzzer (19) is stopped and the heating operation is continued. On the other hand, if water leakage continues even after a predetermined waiting time has elapsed since the alarm was generated, the forced stop unit (65) stops combustion in the burner (17) and stops the circulation pump (35). .

−漏水の判定動作−
次に、本実施形態における漏水の判定動作について説明する。具体的には、漏水判定部(63)が給湯路(15)における漏水の発生を判定する動作について説明する。
-Leakage judgment operation-
Next, the operation for determining water leakage in this embodiment will be described. Specifically, an operation in which the water leakage determination unit (63) determines the occurrence of water leakage in the hot water supply channel (15) will be described.

〈暖房動作中における判定〉
暖房動作中において、漏水判定部(63)は、給湯路(15)における漏水の発生を次のようにして判定する。すなわち、循環ポンプ(35)が作動するのは、上述のとおり、流量センサ(51)が流動状態を検知しておらずかつ床暖房ユニット(34)を運転するときである。このとき、循環水温度センサ(53)の計測値が所定の目標値となるように、バーナ(17)における燃焼により温水循環路(16)および温水回路(30)の水が加熱され、循環水温度センサ(53)の計測値が変動する。また、バーナ(17)における燃焼により給湯路(15)の水も同時に加熱される。
<Judgment during heating operation>
During the heating operation, the water leakage determination unit (63) determines the occurrence of water leakage in the hot water supply channel (15) as follows. That is, as described above, the circulation pump (35) operates when the flow rate sensor (51) does not detect the flow state and operates the floor heating unit (34). At this time, the water in the hot water circulation path (16) and the hot water circuit (30) is heated by the combustion in the burner (17) so that the measured value of the circulating water temperature sensor (53) becomes a predetermined target value. The measured value of the temperature sensor (53) varies. Further, the water in the hot water supply passage (15) is simultaneously heated by the combustion in the burner (17).

ここで、給湯栓(25)がきちんと閉まって給湯路(15)から水が漏れていなければ、給湯温度センサ(52)の計測値は略一定に保たれる。そして、漏水判定部(63)は、循環水温度センサ(53)の計測値が変動している一方、給湯温度センサ(52)の計測値が変動しないことに基づいて、給湯路(15)における漏水が発生していないと判定する。   Here, if the hot-water tap (25) is properly closed and water does not leak from the hot-water supply channel (15), the measured value of the hot-water supply temperature sensor (52) is kept substantially constant. And the water leak determination part (63) is based on the fact that the measured value of the circulating water temperature sensor (53) fluctuates, while the measured value of the hot water temperature sensor (52) does not fluctuate. It is determined that there is no water leakage.

一方、給湯栓(25)が閉まりきっていない、または給湯通路(20)を構成する配管の破損等の原因によって給湯路(15)から水が漏れていると、給湯路(15)で加熱された水が内部給湯管(23)を流れて給湯温度センサ(52)の計測値が変動する。このような原因で漏水が生じている場合、給湯路(15)における水の流量はわずかなので、流量センサ(51)では漏水の発生を検出できない場合が多い。   On the other hand, if water is leaking from the hot water supply passage (15) due to the water supply tap (25) not being fully closed or the piping constituting the hot water supply passage (20) being damaged, the hot water supply passage (15) is heated. Water flowing through the internal hot water supply pipe (23) changes the measurement value of the hot water supply temperature sensor (52). When water leaks due to such a cause, the flow rate of water in the hot water supply passage (15) is very small, and therefore, the flow sensor (51) often cannot detect the occurrence of water leak.

そこで、漏水判定部(63)は、給湯温度センサ(52)の計測値の変動傾向と循環水温度センサ(53)の計測値の変動傾向とが一致することを利用して、両者が一致する状態が所定の基準時間(例えば、5分)に亘って継続すると、給湯路(15)における漏水が発生していると判定する。当該判定に要する基準時間は、上記判定用時間(本実施形態では5秒)よりも十分に長く設定されている。   Therefore, the water leakage determination unit (63) uses the fact that the fluctuation tendency of the measurement value of the hot water supply temperature sensor (52) and the fluctuation tendency of the measurement value of the circulating water temperature sensor (53) match, so that they match. If the state continues for a predetermined reference time (for example, 5 minutes), it is determined that water leakage has occurred in the hot water supply channel (15). The reference time required for the determination is set sufficiently longer than the determination time (5 seconds in the present embodiment).

給湯温度センサ(52)の計測値の変動傾向と循環水温度センサ(53)の計測値の変動傾向とが一致する状態とは、|(T1−T1’)−(T2−T2’)|≦THで表される条件が満たされる状態をいう。ここで、T1およびT2は、それぞれ、ある時刻における給湯温度センサ(52)および循環水温度センサ(53)の計測値である。T1’およびT2’は、それぞれ、当該時刻から上記判定用時間が経過した後の給湯温度センサ(52)および循環水温度センサ(53)の計測値である。また、T1−T1’は、判定用時間における給湯温度センサ(52)の計測値の変動量であり、T2−T2’は、判定用時間における循環水温度センサ(53)の計測値の変動量である。そして、THは所定値であって、例えば2℃に設定される。漏水判定部(63)は、上記条件を満たす状態が所定の基準時間に亘って継続すると、給湯路(15)における漏水が発生していると判定する。   The state in which the fluctuation tendency of the measurement value of the hot water supply temperature sensor (52) and the fluctuation tendency of the measurement value of the circulating water temperature sensor (53) coincide with each other is | (T1-T1 ′) − (T2-T2 ′) | ≦ A state in which the condition represented by TH is satisfied. Here, T1 and T2 are measured values of the hot water supply temperature sensor (52) and the circulating water temperature sensor (53) at a certain time, respectively. T1 'and T2' are measured values of the hot water supply temperature sensor (52) and the circulating water temperature sensor (53) after the determination time has elapsed from that time, respectively. T1-T1 ′ is the amount of change in the measured value of the hot water temperature sensor (52) during the determination time, and T2-T2 ′ is the amount of change in the measured value of the circulating water temperature sensor (53) during the determination time. It is. TH is a predetermined value, and is set to 2 ° C., for example. When the state satisfying the above condition continues for a predetermined reference time, the water leakage determination unit (63) determines that water leakage has occurred in the hot water supply channel (15).

給湯温度センサ(52)の計測値の変動傾向と循環水温度センサ(53)の計測値の変動傾向とは、給湯路(15)における漏水が発生していれば、バーナ(17)による加熱の強弱によらず一致する。このため、本実施形態の給湯装置(10)は、当該給湯装置(10)の運転条件によらず漏水の発生を検出することができる。   The trend of fluctuation in the measured value of the hot water temperature sensor (52) and the trend of fluctuation in the measured value of the circulating water temperature sensor (53) are the results of the heating by the burner (17) if water leaks in the hot water path (15). It matches regardless of strength. For this reason, the hot water supply device (10) of the present embodiment can detect the occurrence of water leakage regardless of the operating conditions of the hot water supply device (10).

なお、漏水判定部(63)は、循環ポンプ(35)の動作中のみならず、循環ポンプ(35)の停止中にも給湯路(15)における漏水の発生を判定するように構成されていてもよい。つまり、漏水判定部(63)は、循環ポンプ(35)の作動状態にかかわらず、|(T1−T1’)−(T2−T2’)|≦THの成否を常に判断するように構成されていてもよい。ここで、循環ポンプ(35)の停止中は、給湯路(15)で漏水が発生していなければ両センサ(52,53)の計測値の変動傾向は一致しない。このため、循環ポンプ(35)の停止中に漏水の発生を判定するようにしても、実際に漏水が発生していないときに漏水判定部(63)が漏水の発生を誤検出する可能性は低い。   The water leakage determination unit (63) is configured to determine the occurrence of water leakage in the hot water supply channel (15) not only during operation of the circulation pump (35) but also when the circulation pump (35) is stopped. Also good. That is, the water leakage determination unit (63) is configured to always determine whether or not | (T1-T1 ′) − (T2-T2 ′) | ≦ TH regardless of the operating state of the circulation pump (35). May be. Here, during the stop of the circulation pump (35), the fluctuation tendency of the measured values of both sensors (52, 53) does not coincide unless water leakage occurs in the hot water supply passage (15). Therefore, even if the occurrence of water leakage is determined while the circulation pump (35) is stopped, there is a possibility that the water leakage determination unit (63) erroneously detects the occurrence of water leakage when no water leakage actually occurs. Low.

〈給湯動作から暖房動作への切替え直後における判定〉
次に、給湯動作から暖房動作へ切り替えた直後における漏水判定について説明する。具体的には、室内の暖房要求が存在するものの、給湯動作を行うために循環ポンプ(35)の作動が禁止されている状態から、ユーザが給湯栓(25)を閉めたことで給湯動作が終了して暖房動作が開始した直後における漏水判定について説明する。
<Judgment immediately after switching from hot water operation to heating operation>
Next, the water leakage determination immediately after switching from the hot water supply operation to the heating operation will be described. Specifically, although there is a request for heating in the room, the hot water supply operation is performed when the user closes the hot water tap (25) from the state where the operation of the circulation pump (35) is prohibited to perform the hot water supply operation. The water leakage determination immediately after the end and the heating operation starts will be described.

まず、室内の暖房要求がある状態で給湯動作を行っている場合、上述のとおり、流量センサ(51)が流動状態を検知しており、当該検知結果を受けた加熱制御部(62)によりバーナ(17)が作動すると共に、当該検知結果を受けたポンプ制御部(61)により循環ポンプ(35)の作動が禁止される。そして、加熱制御部(62)がバーナ(17)に対する燃料ガスの供給量を調節することで、給湯温度センサ(52)の計測値が所定の目標値(例えば、60℃)と略一致している。   First, when the hot water supply operation is performed in a state where there is a request for heating in the room, as described above, the flow sensor (51) detects the flow state, and the heating control unit (62) receiving the detection result burns the burner. (17) is activated, and the pump control unit (61) receiving the detection result prohibits the operation of the circulation pump (35). The heating control unit (62) adjusts the amount of fuel gas supplied to the burner (17), so that the measured value of the hot water supply temperature sensor (52) substantially coincides with a predetermined target value (for example, 60 ° C.). Yes.

かかる状態でユーザが給湯栓(25)を閉めると、流量センサ(51)が流動状態を検知しなくなり、ポンプ制御部(61)により循環ポンプ(35)の作動が許可される。そして、室内の暖房要求があるので、すぐに循環ポンプ(35)が作動して暖房動作が開始される。   When the user closes the hot water tap (25) in such a state, the flow rate sensor (51) does not detect the flow state, and the pump controller (61) permits the operation of the circulation pump (35). Since there is a request for heating in the room, the circulation pump (35) is immediately activated to start the heating operation.

暖房動作が開始された直後は、給湯動作中に加熱された水が給湯路(15)の出口付近に滞留しているため、給湯温度センサ(52)の計測値は所定の目標値のままである。そして、給湯路(15)における漏水が発生していなければ、暖房動作の開始後に加熱された水が当該給湯路(15)の出口まで流れてこないので、給湯温度センサ(52)の計測値は徐々に低下していく。一方、給湯路(15)における漏水が発生していると、暖房動作の開始後に加熱された水が当該給湯路(15)の出口から給湯栓(25)まで流れる。この場合、給湯路(15)の水と温水循環路(16)の水とが同時に加熱されるため、給湯温度センサ(52)の計測値の変動傾向と循環水温度センサ(53)の計測値の変動傾向とが一致する。よって、漏水判定部(63)は、上記と同様の判定方法により、給湯路(15)における漏水の発生を検出することができる。   Immediately after the heating operation is started, water heated during the hot water supply operation stays in the vicinity of the outlet of the hot water supply passage (15), so the measured value of the hot water temperature sensor (52) remains at the predetermined target value. is there. And if there is no water leakage in the hot water supply passage (15), the heated water will not flow to the outlet of the hot water supply passage (15) after the start of the heating operation, so the measured value of the hot water supply temperature sensor (52) is It gradually decreases. On the other hand, if water leaks in the hot water supply channel (15), the heated water flows after the heating operation starts from the outlet of the hot water supply channel (15) to the hot water tap (25). In this case, since the water in the hot water supply channel (15) and the water in the hot water circuit (16) are heated at the same time, the fluctuation tendency of the measured value of the hot water temperature sensor (52) and the measured value of the circulating water temperature sensor (53) This agrees with the trend of fluctuation. Therefore, the water leakage determination unit (63) can detect the occurrence of water leakage in the hot water supply channel (15) by the same determination method as described above.

ここで、仮に、給湯温度センサ(52)の計測値のみに基づいて給湯路(15)における漏水の発生を判定しようとすれば、暖房動作開始後のある程度の時間は誤判定をしてしまうおそれがある。すなわち、給湯温度センサ(52)の計測値のみを判定に用いる場合には、当該計測値が所定の閾値を上回った場合に漏水の発生を判定することが考えられる。しかし、暖房動作の開始直後には、それまで給湯動作を行っていたために給湯温度センサ(52)の計測値が比較的高く、当該閾値を上回っていることがある。このため、給湯路(15)における漏水は発生していなくても、ある程度の時間が経過して給湯温度センサ(52)の計測値が十分に低下するまでの間は、給湯路(15)で漏水が発生していると誤判定するおそれがある。   Here, if it is attempted to determine the occurrence of water leakage in the hot water supply passage (15) based only on the measured value of the hot water supply temperature sensor (52), there is a risk that a certain amount of time after the start of the heating operation will be erroneously determined. There is. That is, when only the measured value of the hot water supply temperature sensor (52) is used for the determination, it can be considered that the occurrence of water leakage is determined when the measured value exceeds a predetermined threshold. However, immediately after the start of the heating operation, the hot water supply operation has been performed so far, so the measured value of the hot water supply temperature sensor (52) is relatively high and may exceed the threshold value. For this reason, even if there is no water leakage in the hot water supply channel (15), the hot water supply channel (15) is used until a certain amount of time passes and the measured value of the hot water temperature sensor (52) decreases sufficiently. There is a risk of misjudgment that water leakage has occurred.

一方、本実施形態の給湯装置(10)のように、給湯温度センサ(52)および循環水温度センサ(53)の双方の計測値に基づいて判定を行うのであれば、上記誤判定の問題は発生しない。すなわち、給湯動作から暖房動作に切り替わった直後において、給湯路(15)で漏水が発生していなければ、給湯温度センサ(52)の計測値が低下するのに対して循環水温度センサ(53)の計測値は上昇する。つまり、給湯路(15)で漏水が発生していなければ、給湯温度センサ(52)の計測値の変動傾向と循環水温度センサ(53)の計測値の変動傾向とが所定の基準時間に亘って一致することはないので、本実施形態の漏水判定部(63)が漏水の発生を誤判定するおそれがない。よって、本実施形態の給湯装置(10)によれば、給湯動作から暖房動作に切り替わった直後でも、給湯路(15)における漏水の発生を正しく判定することができる。   On the other hand, if the determination is made based on the measured values of both the hot water temperature sensor (52) and the circulating water temperature sensor (53) as in the hot water supply device (10) of the present embodiment, the problem of the erroneous determination is as follows. Does not occur. That is, immediately after switching from the hot water supply operation to the heating operation, if there is no water leakage in the hot water supply passage (15), the measured value of the hot water supply temperature sensor (52) is reduced, whereas the circulating water temperature sensor (53) The measured value increases. In other words, if there is no water leakage in the hot water supply passage (15), the fluctuation tendency of the measurement value of the hot water temperature sensor (52) and the fluctuation tendency of the measurement value of the circulating water temperature sensor (53) are over a predetermined reference time. Therefore, there is no possibility that the water leakage determination unit (63) of the present embodiment erroneously determines the occurrence of water leakage. Therefore, according to the hot water supply device (10) of the present embodiment, it is possible to correctly determine the occurrence of water leakage in the hot water supply passage (15) even immediately after switching from the hot water supply operation to the heating operation.

−実施形態1の効果−
本実施形態の給湯装置(10)では、給湯路(15)で漏水が発生している場合に、給湯路(15)の出口の水温の変動傾向と温水循環路(16)の出口の水温の変動傾向とが一致することを利用して、給湯路(15)における漏水の発生を判定することができる。かかる変動傾向の一致は、バーナ(17)による加熱の強弱によらず生じるので、給湯装置(10)の運転条件によらず漏水の発生を検出することができる。
-Effect of Embodiment 1-
In the hot water supply device (10) of this embodiment, when water leakage occurs in the hot water supply channel (15), the fluctuation of the water temperature at the outlet of the hot water supply channel (15) and the water temperature at the outlet of the hot water circulation channel (16) The occurrence of water leakage in the hot water supply channel (15) can be determined by utilizing the fact that the fluctuation tendency matches. Since the coincidence of such fluctuation trends occurs regardless of the strength of heating by the burner (17), the occurrence of water leakage can be detected regardless of the operating conditions of the hot water supply device (10).

また、給湯温度センサ(52)の計測値の変動傾向と循環水温度センサ(53)の計測値の変動傾向とが所定の基準時間に亘って一致することを、給湯路(15)における漏水が発生していると判定する条件としている。このため、給湯動作から暖房動作に切り替わった直後でも、給湯路(15)における漏水の発生を正しく判定することができる。   Further, the fact that the fluctuation trend of the measurement value of the hot water supply temperature sensor (52) and the fluctuation tendency of the measurement value of the circulating water temperature sensor (53) coincide with each other over a predetermined reference time indicates that water leakage in the hot water supply channel (15) It is a condition for determining that it has occurred. For this reason, even immediately after switching from the hot water supply operation to the heating operation, it is possible to correctly determine the occurrence of water leakage in the hot water supply passage (15).

また、給湯路(15)における漏水の発生を警報発生部(64)がユーザに報知するので、ユーザは、漏水に対して素早く対処することができる。このため、給湯装置(10)の安全性を向上させることができる。   Moreover, since the alarm generation unit (64) notifies the user of the occurrence of water leakage in the hot water supply channel (15), the user can quickly cope with the water leakage. For this reason, the safety of the hot water supply device (10) can be improved.

また、漏水発生の判定に用いる給湯温度センサ(52)および循環水温度センサ(53)は、いずれも当該判定以外に用途がある。すなわち、給湯温度センサ(52)は、給湯動作において給湯栓(25)から供給される湯水の温度を制御するために用いられ、循環水温度センサ(53)は、暖房動作において床暖房ユニット(34)で利用される温水の温度を制御するために用いられる。つまり、給湯装置(10)の主な機能を実現するために用いられるセンサ(52,53)を、給湯路(15)における漏水の発生を判定するのにも用いている。このため、当該判定のためだけに新たなセンサを追加する必要がなく、給湯装置(10)を低コストに製造することができる。   Further, the hot water supply temperature sensor (52) and the circulating water temperature sensor (53) used for the determination of the occurrence of water leakage have applications other than the determination. That is, the hot water supply temperature sensor (52) is used to control the temperature of hot water supplied from the hot water tap (25) in the hot water supply operation, and the circulating water temperature sensor (53) is used in the heating operation. ) Used to control the temperature of the hot water used. That is, the sensors (52, 53) used for realizing the main functions of the hot water supply device (10) are also used to determine the occurrence of water leakage in the hot water supply passage (15). For this reason, it is not necessary to add a new sensor only for the determination, and the hot water supply device (10) can be manufactured at low cost.

《発明の実施形態2》
本発明の実施形態2について説明する。本実施形態は、上記実施形態1において、漏水判定部(63)の構成を変更したものである。ここでは、本実施形態の漏水判定部(63)について説明する。
<< Embodiment 2 of the Invention >>
A second embodiment of the present invention will be described. This embodiment is obtained by changing the configuration of the water leakage determination unit (63) in the first embodiment. Here, the water leakage determination part (63) of this embodiment is demonstrated.

−漏水判定部−
本実施形態の漏水判定部(63)は、給湯温度センサ(52)の計測値が循環水温度センサ(53)の計測値よりも高いか否かに基づいて給湯路(15)における漏水の発生を判定する。具体的に、漏水判定部(63)は、以下のようにして、給湯路(15)における漏水の発生を判定する。
-Water leakage judgment part-
The water leakage determination unit (63) of the present embodiment generates water leakage in the hot water supply channel (15) based on whether the measured value of the hot water temperature sensor (52) is higher than the measured value of the circulating water temperature sensor (53). Determine. Specifically, the water leakage determination unit (63) determines the occurrence of water leakage in the hot water supply channel (15) as follows.

すなわち、暖房動作では、循環水温度センサ(53)の計測値が所定の目標値となるように、バーナ(17)における燃焼により温水循環路(16)および温水回路(30)の水が加熱され、循環水温度センサ(53)の計測値が上昇する。また、バーナ(17)における燃焼により給湯路(15)の水も同時に加熱される。   That is, in the heating operation, the water in the hot water circuit (16) and the hot water circuit (30) is heated by the combustion in the burner (17) so that the measured value of the circulating water temperature sensor (53) becomes a predetermined target value. The measured value of the circulating water temperature sensor (53) increases. Further, the water in the hot water supply passage (15) is simultaneously heated by the combustion in the burner (17).

ここで、給湯栓(25)がきちんと閉まって給湯路(15)から水が漏れていなければ、加熱された水は給湯路(15)から流出してこないので、給湯温度センサ(52)の計測値は上昇しない。そこで、漏水判定部(63)は、循環水温度センサ(53)の計測値が給湯温度センサ(52)の計測値よりも高いことに基づいて、給湯路(15)における漏水が発生していないと判定する。   Here, if the hot water tap (25) is closed properly and water does not leak from the hot water supply channel (15), the heated water will not flow out of the hot water supply channel (15). The value does not rise. Therefore, the water leakage determination unit (63) has no leakage in the hot water supply channel (15) based on the measured value of the circulating water temperature sensor (53) being higher than the measured value of the hot water temperature sensor (52). Is determined.

一方、給湯栓(25)が閉まりきっていない、または給湯通路(20)を構成する配管の破損等の原因によって給湯路(15)から水が漏れていると、給湯路(15)で加熱された水が内部給湯管(23)を流れて給湯温度センサ(52)の計測値が上昇する。ここで、給湯路(15)における水の流量はわずかであるので、給湯路(15)を流れる水は、温水回路(30)を流れる水よりも高い温度まで加熱される。そして、漏水判定部(63)は、給湯温度センサ(52)の計測値が循環水温度センサ(53)の計測値よりも高い状態が所定の基準時間(例えば、5分)に亘って継続すると、給湯路(15)における漏水が発生していると判定する。   On the other hand, if water is leaking from the hot water supply passage (15) due to the water supply tap (25) not being fully closed or the piping constituting the hot water supply passage (20) being damaged, the hot water supply passage (15) is heated. Water flowing through the internal hot water supply pipe (23) increases the measurement value of the hot water supply temperature sensor (52). Here, since the flow rate of the water in the hot water supply channel (15) is small, the water flowing through the hot water supply channel (15) is heated to a temperature higher than that of the water flowing through the hot water circuit (30). And when the state where the measured value of the hot water supply temperature sensor (52) is higher than the measured value of the circulating water temperature sensor (53) continues for a predetermined reference time (for example, 5 minutes) It is determined that water leakage has occurred in the hot water supply channel (15).

ここで、漏水判定部(63)は、給湯路(15)の出口の水温の目標値が温水循環路(16)の出口の水温の目標値よりも低い場合に限って、給湯路(15)における漏水が発生していると判定するように構成されている。   Here, the water leakage determination unit (63) is configured so that the hot water supply channel (15) is provided only when the target water temperature at the outlet of the hot water supply channel (15) is lower than the target water temperature at the outlet of the hot water circulation channel (16). It is comprised so that it may determine with the water leak in.

すなわち、給湯路(15)の出口の水温の目標値が温水循環路(16)の出口の水温の目標値よりも高い場合、例えば給湯動作から暖房動作に切り替わった直後には、給湯温度センサ(52)の計測値が循環水温度センサ(53)の計測値よりも高くなっている。このため、給湯温度センサ(52)の計測値が循環水温度センサ(53)の計測値よりも高いことのみを判定の条件とすると、給湯路(15)で漏水が発生していると誤判定するおそれがある。   That is, when the target value of the water temperature at the outlet of the hot water supply passage (15) is higher than the target value of the water temperature at the outlet of the hot water circulation passage (16), for example, immediately after switching from the hot water supply operation to the heating operation, The measured value of 52) is higher than the measured value of the circulating water temperature sensor (53). For this reason, assuming that the measured value of the hot water supply temperature sensor (52) is higher than the measured value of the circulating water temperature sensor (53), it is erroneously determined that water leakage has occurred in the hot water supply channel (15). There is a risk.

一方、給湯路(15)の出口の水温の目標値が温水循環路(16)の出口の水温の目標値よりも低いのであれば、給湯温度センサ(52)の計測値が循環水温度センサ(53)の計測値よりも高くなるのは、給湯路(15)で漏水が発生したときに限られる。このため、本実施形態の給湯装置(10)によれば、給湯路(15)における漏水の発生を正しく判定することができる。   On the other hand, if the target value of the water temperature at the outlet of the hot water supply channel (15) is lower than the target value of the water temperature at the outlet of the hot water circuit (16), the measured value of the hot water temperature sensor (52) Only when water leaks in the hot water supply channel (15), the measured value is higher than the value measured in 53). For this reason, according to the hot water supply device (10) of the present embodiment, it is possible to correctly determine the occurrence of water leakage in the hot water supply channel (15).

また、給湯路(15)における漏水が発生していれば、バーナ(17)による加熱の強弱によらず、給湯温度センサ(52)の計測値は循環水温度センサ(53)の計測値よりも高くなる。このため、本実施形態の給湯装置(10)は、当該給湯装置(10)の運転条件によらず漏水の発生を検出することができる。   In addition, if water leakage occurs in the hot water supply channel (15), the measured value of the hot water temperature sensor (52) is higher than the measured value of the circulating water temperature sensor (53), regardless of the intensity of heating by the burner (17). Get higher. For this reason, the hot water supply device (10) of the present embodiment can detect the occurrence of water leakage regardless of the operating conditions of the hot water supply device (10).

−実施形態2の効果−
本実施形態の給湯装置(10)では、給湯路(15)で漏水が発生している場合、給湯路(15)の出口の水温が温水循環路(16)の出口の水温よりも高くなる現象を利用して、給湯路(15)における漏水の発生を検出できる。かかる現象は、バーナ(17)による加熱の強弱によらず生じるので、給湯装置(10)の運転条件によらず漏水の発生を検出することができる。
-Effect of Embodiment 2-
In the hot water supply device (10) of the present embodiment, when water leakage occurs in the hot water supply passage (15), the water temperature at the outlet of the hot water supply passage (15) becomes higher than the water temperature at the outlet of the hot water circulation passage (16). Can be used to detect the occurrence of water leakage in the hot water supply channel (15). Since such a phenomenon occurs regardless of the strength of heating by the burner (17), the occurrence of water leakage can be detected regardless of the operating conditions of the hot water supply device (10).

また、漏水判定部(63)は、給湯路(15)の出口の水温の目標値が温水循環路(16)の出口の水温の目標値よりも低い場合に限って、給湯路(15)における漏水が発生していると判定するように構成されている。このため、給湯路(15)における漏水発生の誤検出を確実に防止することができる。   In addition, the water leakage determination unit (63) is configured to provide a water supply path (15) in the hot water supply path (15) only when the target water temperature at the outlet of the hot water supply path (15) is lower than the target value of the water temperature at the outlet of the hot water circulation path (16). It is configured to determine that water leakage has occurred. For this reason, it is possible to reliably prevent erroneous detection of water leakage in the hot water supply passage (15).

−実施形態2の変形例−
実施形態2の給湯装置(10)では、給湯路(15)の出口の水温の目標値と温水循環路(16)の出口の水温の目標値との関係によらず、給湯温度センサ(52)の計測値が循環水温度センサ(53)の計測値よりも高い状態が所定の基準時間に亘って継続したときに、給湯路(15)で漏水が発生していると判定してもよい。この場合、給湯動作から暖房動作に切り替わった直後における誤判定を避けるために、暖房動作が開始してから給湯路(15)の出口の水温が十分に低下するまでの間は漏水判定部(63)による判定を禁止することが好ましい。
-Modification of Embodiment 2-
In the hot water supply device (10) of the second embodiment, the hot water supply temperature sensor (52) regardless of the relationship between the target water temperature at the outlet of the hot water supply passage (15) and the target water temperature at the outlet of the hot water circulation passage (16). When a state in which the measured value is higher than the measured value of the circulating water temperature sensor (53) continues for a predetermined reference time, it may be determined that water leakage has occurred in the hot water supply channel (15). In this case, in order to avoid an erroneous determination immediately after switching from the hot water supply operation to the heating operation, the water leakage determination unit (63) until the water temperature at the outlet of the hot water supply passage (15) sufficiently decreases after the heating operation is started. ) Is preferably prohibited.

《その他の実施形態》
上記各実施形態では、熱交換器(14)およびバーナ(17)が加熱部を構成しているが、これに限らず、例えば、給湯路(15)および温水循環路(16)にそれぞれ導電性部材を設けると共に、当該導電性部材に交番磁界を印加するためのコイルを設けてもよい。この場合、導電性部材およびコイルが加熱部を構成する。
<< Other Embodiments >>
In each said embodiment, although a heat exchanger (14) and a burner (17) comprise a heating part, it is not restricted to this, For example, it is electrically conductive to a hot water supply path (15) and a warm water circulation path (16), respectively. While providing a member, you may provide the coil for applying an alternating magnetic field to the said electroconductive member. In this case, the conductive member and the coil constitute the heating unit.

また、上記各実施形態では、床暖房ユニット(34)が温水利用機器を構成しているが、これに限らず、例えば、風呂追焚き装置が温水利用機器を構成していてもよい。   Moreover, in each said embodiment, although the floor heating unit (34) comprises the warm water utilization apparatus, it is not restricted to this, For example, the bath chase apparatus may comprise the warm water utilization apparatus.

以上説明したように、本発明は、給湯装置について有用である。   As described above, the present invention is useful for a hot water supply apparatus.

10 給湯装置
14 熱交換器(加熱部)
15 給湯路
16 温水循環路
17 バーナ(加熱部)
19 ブザー(報知部)
25 給湯栓
30 温水回路
34 床暖房ユニット(温水利用機器)
35 循環ポンプ
51 流量センサ(流動検知部)
52 給湯温度センサ
53 循環水温度センサ
61 ポンプ制御部
62 加熱制御部
63 漏水判定部
64 警報発生部(報知部)
10 Water heater
14 Heat exchanger (heating unit)
15 Hot water supply path
16 Hot water circuit
17 Burner (heating unit)
19 Buzzer (notification part)
25 Hot water tap
30 Hot water circuit
34 Floor heating unit (equipment using hot water)
35 Circulation pump
51 Flow sensor (flow detection part)
52 Hot water temperature sensor
53 Circulating water temperature sensor
61 Pump controller
62 Heating control unit
63 Leakage detector
64 Alarm generator (notification unit)

Claims (6)

給湯栓(25)に接続されて水が流れる給湯路(15)、および、温水利用機器(34)との間で水を循環させるための温水回路(30)に接続される温水循環路(16)が設けられ、上記給湯路(15)および上記温水循環路(16)の水を同時に加熱する加熱部(14,17)と、上記温水利用機器(34)の運転中に上記温水回路(30)の水を循環させる循環ポンプ(35)とを備える給湯装置(10)であって、
上記給湯路(15)における水の流量が基準流量以上である流動状態か否かを検知する流動検知部(51)と、
上記流動検知部(51)が流動状態を検知している間は上記循環ポンプ(35)の作動を禁止し、上記流動検知部(51)が流動状態を検知していない間は上記循環ポンプ(35)の作動を許可するポンプ制御部(61)と、
上記流動検知部(51)が流動状態を検知しているかまたは上記循環ポンプ(35)が作動している間は上記加熱部(14,17)を作動させ、上記流動検知部(51)が流動状態を検知しておらずかつ上記循環ポンプ(35)が停止している間は上記加熱部(14,17)を作動させない加熱制御部(62)と、
上記加熱部(14,17)の上記給湯路(15)の出口の水温を計測する給湯温度センサ(52)と、
上記加熱部(14,17)の上記温水循環路(16)の出口の水温を計測する循環水温度センサ(53)と、
上記循環ポンプ(35)の作動中に、上記給湯温度センサ(52)および上記循環水温度センサ(53)の計測値に基づいて上記給湯路(15)における漏水の発生を判定する漏水判定部(63)とをさらに備えている
ことを特徴とする給湯装置。
A hot water supply passage (16) connected to a hot water tap (25) and a hot water circulation passage (16) connected to a hot water circuit (30) for circulating water between the hot water supply device (34) and a hot water use device (34) ) And a heating unit (14, 17) for simultaneously heating water in the hot water supply channel (15) and the hot water circulation channel (16), and the hot water circuit (30) during operation of the hot water utilization device (34). A hot water supply device (10) comprising a circulation pump (35) for circulating water)
A flow detection unit (51) for detecting whether or not the flow rate of water in the hot water supply channel (15) is in a flow state equal to or higher than a reference flow rate;
While the flow detection unit (51) is detecting the flow state, the operation of the circulation pump (35) is prohibited, and while the flow detection unit (51) is not detecting the flow state, the circulation pump (35) A pump controller (61) that permits the operation of 35);
While the flow detection unit (51) detects the flow state or the circulation pump (35) is operating, the heating unit (14, 17) is operated and the flow detection unit (51) is flowing. A heating control unit (62) that does not operate the heating unit (14, 17) while the state is not detected and the circulation pump (35) is stopped;
A hot water supply temperature sensor (52) for measuring the water temperature at the outlet of the hot water supply passage (15) of the heating section (14, 17);
A circulating water temperature sensor (53) for measuring the water temperature at the outlet of the hot water circuit (16) of the heating unit (14, 17);
During operation of the circulation pump (35), a water leakage determination unit (determining occurrence of water leakage in the hot water supply passage (15) based on the measured values of the hot water supply temperature sensor (52) and the circulating water temperature sensor (53)) 63).
請求項1において、
上記漏水判定部(63)は、上記給湯温度センサ(52)の計測値の変動傾向と上記循環水温度センサ(53)の計測値の変動傾向とが一致する状態が所定の基準時間に亘って継続すると、上記給湯路(15)における漏水が発生していると判定する
ことを特徴とする給湯装置。
In claim 1,
The water leakage determination unit (63) has a state in which the variation tendency of the measurement value of the hot water supply temperature sensor (52) coincides with the variation tendency of the measurement value of the circulating water temperature sensor (53) over a predetermined reference time. If it continues, it will determine with the water leak in the said hot-water supply path (15) having generate | occur | produced, The hot-water supply apparatus characterized by the above-mentioned.
請求項2において、
上記漏水判定部(63)は、上記基準時間よりも短い所定の判定用時間における上記給湯温度センサ(52)の計測値の変動量と上記循環水温度センサ(53)の計測値の変動量との差が所定値以下である状態が上記基準時間に亘って継続すると、上記給湯路(15)における漏水が発生していると判定する
ことを特徴とする給湯装置。
In claim 2,
The water leakage determination unit (63) includes a variation amount of the measurement value of the hot water supply temperature sensor (52) and a variation amount of the measurement value of the circulating water temperature sensor (53) in a predetermined determination time shorter than the reference time. When the state where the difference between the two is not more than a predetermined value continues for the reference time, it is determined that water leakage has occurred in the hot water supply passage (15).
請求項1において、
上記漏水判定部(63)は、上記給湯温度センサ(52)の計測値が上記循環水温度センサ(53)の計測値よりも高い状態が所定の基準時間に亘って継続すると、上記給湯路(15)における漏水が発生していると判定する
ことを特徴とする給湯装置。
In claim 1,
When the state where the measured value of the hot water temperature sensor (52) is higher than the measured value of the circulating water temperature sensor (53) continues for a predetermined reference time, the water leakage determination unit (63) A hot water supply apparatus characterized in that it is determined that water leakage occurs in 15).
請求項1において、
上記漏水判定部(63)は、上記加熱部(14,17)の上記給湯路(15)の出口の水温の目標値が上記加熱部(14,17)の上記温水循環路(16)の出口の水温の目標値よりも低く、かつ上記給湯温度センサ(52)の計測値が上記循環水温度センサ(53)の計測値よりも高い状態が所定の基準時間に亘って継続すると、上記給湯路(15)における漏水が発生していると判定する
ことを特徴とする給湯装置。
In claim 1,
The water leakage determination unit (63) is configured such that the target water temperature at the outlet of the hot water supply passage (15) of the heating unit (14, 17) is the outlet of the hot water circulation passage (16) of the heating unit (14, 17). When the state where the measured value of the hot water temperature sensor (52) is lower than the measured value of the hot water temperature sensor (52) and higher than the measured value of the circulating water temperature sensor (53) continues for a predetermined reference time, the hot water supply path (15) A hot water supply apparatus characterized by determining that water leakage has occurred.
請求項1〜5のいずれか1項において、
上記漏水判定部(63)が給湯路(15)における漏水の発生を判定すると、ユーザに漏水の発生を報知する報知部(19,64)をさらに備えている
ことを特徴とする給湯装置。
In any one of Claims 1-5,
The hot water supply apparatus further comprising a notifying unit (19, 64) for notifying the user of the occurrence of water leakage when the water leakage determining unit (63) determines the occurrence of water leakage in the hot water supply channel (15).
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