JP6670145B2 - Consolidated hot water supply system - Google Patents

Consolidated hot water supply system Download PDF

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JP6670145B2
JP6670145B2 JP2016061583A JP2016061583A JP6670145B2 JP 6670145 B2 JP6670145 B2 JP 6670145B2 JP 2016061583 A JP2016061583 A JP 2016061583A JP 2016061583 A JP2016061583 A JP 2016061583A JP 6670145 B2 JP6670145 B2 JP 6670145B2
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heat exchanger
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幸哲 木村
幸哲 木村
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リンナイ株式会社
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本発明は、複数の給湯ユニットが連結された連結給湯システムに関する。特に、本発明は、連結給湯システムを構成する各給湯ユニットの漏水の検知に関する。   The present invention relates to a connected hot water supply system in which a plurality of hot water supply units are connected. In particular, the present invention relates to the detection of water leakage from each hot water supply unit that constitutes a combined hot water supply system.
従来、複数の給湯器を連結して用いる連結給湯システムが知られている。この種の連結給湯システムによれば、専用設計でコストが高い大型の給湯器を設置することなく、比較的小型の給湯器を複数、連結して設置すればよいため、製造コストを低減できる。また、要求される給湯負荷に応じて稼動させる給湯器の台数を増減させるため、広範囲の給湯量に対応できる(特許文献1)。   Conventionally, a connected hot water supply system using a plurality of hot water heaters connected to each other has been known. According to this type of connected hot water supply system, a plurality of relatively small water heaters may be connected and installed without installing a large-sized hot water heater that is specially designed and expensive, so that manufacturing costs can be reduced. Further, since the number of hot water heaters to be operated is increased or decreased according to a required hot water supply load, it is possible to cope with a wide range of hot water supply amount (Patent Document 1).
ところで、連結給湯システムは大型の装置であるため、建物の地下や屋上などに設置される場合が多い。そのため、給湯器内の配管から漏水が生じても、漏水が発見され難い。また、連結給湯システムでは、一部の給湯器で漏水が生じても、他の給湯器から出湯が可能であるため、ある程度以上の出湯量の低下が生じるまで、漏水が認識されず、被害が大きくなるという問題がある。   By the way, since a connected hot water supply system is a large-sized device, it is often installed in a basement of a building, a rooftop, or the like. Therefore, even if water leaks from the piping in the water heater, the water leak is hard to be found. In addition, in the concatenated hot water supply system, even if water leakage occurs in some water heaters, water can be discharged from other water heaters. There is a problem that it becomes larger.
漏水を検知するために、例えば、バーナで発生させた燃焼ガスによって加熱される二次熱交換器及び一次熱交換器を備え、二次熱交換器及び一次熱交換器の順に水が通水される単一の給湯器において、二次熱交換器への通水を停止して、一次熱交換器のみに通水する切替弁と、ドレン配管に二次熱交換器からの漏水を検知する漏水検知手段とを設け、給湯運転時に通常以上の流量が漏水検知手段で検知されるかどうかから、二次熱交換器の漏水を判定することが提案されている(特許文献2)。また、例えば、熱媒循環路と給湯回路との間に液々熱交換器を設けた単一の給湯器においては、給湯回路の給湯側を開閉する開閉手段と、給湯回路の水流を検知する水流検知手段とを設け、開閉手段が閉じられたときに、水流検知手段で水流が検知されるかどうかから、漏水の有無を判定することが提案されている(特許文献3)。   In order to detect water leakage, for example, a secondary heat exchanger and a primary heat exchanger that are heated by the combustion gas generated by the burner are provided, and water is passed in the order of the secondary heat exchanger and the primary heat exchanger. In a single water heater, a switch valve that stops water flow to the secondary heat exchanger and allows water to flow only to the primary heat exchanger, and a water leak that detects water leakage from the secondary heat exchanger to the drain pipe It has been proposed to provide a detecting means and determine whether or not the secondary heat exchanger has leaked from whether or not a flow rate higher than normal is detected by the water leak detecting means during hot water supply operation (Patent Document 2). Further, for example, in a single water heater provided with a liquid heat exchanger between the heat medium circulation path and the hot water supply circuit, an opening / closing means for opening and closing the hot water supply side of the hot water supply circuit and a water flow of the hot water supply circuit are detected. It has been proposed to provide a water flow detecting means and determine whether or not water leakage has occurred, based on whether or not a water flow is detected by the water flow detecting means when the opening / closing means is closed (Patent Document 3).
特開2007−292383号公報JP 2007-292383 A 特開2004−293917号公報JP 2004-293917 A 特開2003−114055号公報JP 2003-114055 A
しかしながら、特許文献2の給湯器で二次熱交換器への通水を停止させるためには、切替弁として高コストの三方弁を必要とするという問題や、高温の燃焼ガスで加熱されて経年劣化の大きな一次熱交換器からの漏水をチェックできないという問題がある。   However, in order to stop the flow of water to the secondary heat exchanger in the water heater of Patent Literature 2, there is a problem that a high-cost three-way valve is required as a switching valve, and there is a problem that the hot water is heated by high-temperature combustion gas. There is a problem that it is not possible to check for water leakage from the primary heat exchanger, which is greatly deteriorated.
また、特許文献3の給湯器では、所定の時刻が到来すると、開閉手段により給湯回路を閉じて漏水チェックが行われるため、給湯運転と漏水チェックとが重複した場合、湯水の出湯が停止されてしまうという問題がある。特に、連結給湯システムは、単一の給湯器と異なり、多数の給湯先と繋がっており、給湯需要は不定期で発生するため、漏水チェックの実行時期を固定することが難しい。   Further, in the water heater of Patent Document 3, when a predetermined time has arrived, the hot water supply circuit is closed by the opening / closing means and the water leak check is performed. Therefore, when the hot water supply operation and the water leak check overlap, the tapping of hot water is stopped. Problem. In particular, unlike a single hot water supply system, a connected hot water supply system is connected to a number of hot water supply destinations, and hot water supply demand is generated irregularly, so that it is difficult to fix the execution time of a water leak check.
一方、連結給湯システムにおいても、全ての給湯先で給湯需要が生じていなければ、開閉手段で給湯回路を閉じることにより、漏水チェックを行うこともできると考えられる。   On the other hand, in the connected hot water supply system, if hot water supply demand does not occur at all hot water supply destinations, it is considered that a water leak check can be performed by closing the hot water supply circuit by the opening / closing means.
しかしながら、連結給湯システムが、特許文献3のような熱媒循環路と給湯回路とを別々に設けた給湯器と異なり、特許文献2のようなバーナで発生する燃焼ガスで熱交換器を直接加熱し、湯水を出湯させる給湯器で構成されている場合、少なくとも1箇所の給湯先を開栓して最低作動水量以上の給水量が検知されるとバーナを点火させ、全ての給湯先を閉栓して最低作動水量未満の給水量が検知されるとバーナを消火させる点消火制御が行われる。それゆえ、このような給水量により点消火制御が行われる先止め式の給湯器では、各給湯器が正常に稼動可能な状態であったとしても、開閉手段により給湯回路を閉じて漏水チェックが開始されると給水量が検知されなくなるため、給湯需要が生じたときに給湯運転が開始されないという問題がある。   However, unlike a hot water supply system in which a heating medium circulation path and a hot water supply circuit are separately provided as in Patent Literature 3, the connected hot water supply system directly heats the heat exchanger with combustion gas generated by a burner as in Patent Literature 2. In the case of a water heater for supplying hot and cold water, at least one hot water supply destination is opened and a burner is ignited when a water supply amount equal to or more than the minimum working water amount is detected, and all the hot water supply destinations are closed. When a water supply amount less than the minimum operation water amount is detected, a point fire extinguishing control for extinguishing the burner is performed. Therefore, in the water heater of the stop-stop type in which the point fire extinguishing control is performed by such a water supply amount, even if each water heater is normally operable, the hot water supply circuit is closed by the opening / closing means to check for water leakage. When started, the amount of water supply is no longer detected, so that there is a problem that hot water supply operation is not started when hot water supply demand occurs.
本発明は上記課題を解決するものであり、本発明の目的は、複数の給湯ユニットが連結された連結給湯システムにおいて、システム全体の給湯運転を妨げることなく、低コストで、各給湯ユニットの漏水を判定することにある。   An object of the present invention is to solve the above-described problems, and an object of the present invention is to provide a connected hot water supply system in which a plurality of hot water supply units are connected, without disturbing the hot water supply operation of the entire system, at a low cost, and by preventing water leakage of each hot water supply unit. Is to judge.
本発明によれば、バーナ、熱交換器、熱交換器に水を供給する給水管、熱交換器から湯水を出湯する出湯管、給水管を流れる水の給水量を検知する給水量検知手段、及び出湯管を開閉する出湯側開閉弁を各別に有する複数台の給湯ユニットと、
各給湯ユニットの漏水を検知する制御ユニットとを備える連結給湯システムであって、
制御ユニットは、全ての給湯ユニットが非稼動状態にある場合、各給湯ユニットの稼動情報に基づき少なくとも最低台数の給湯ユニットは出湯側開閉弁を開弁状態で待機させ、
出湯側開閉弁を開弁状態で待機させる給湯ユニット以外の少なくとも1台の給湯ユニットであって継続運転時間が所定の判定時間以上である給湯ユニットの出湯側開閉弁を閉弁状態で待機させて、出湯側開閉弁が閉弁状態にある給湯ユニットの給水量検知手段からの出力に基づき漏水を判定する連結給湯システムが提供される。
According to the present invention, a burner, a heat exchanger, a water supply pipe for supplying water to the heat exchanger, a water supply pipe for supplying hot water from the heat exchanger, a water supply amount detection unit for detecting a water supply amount of water flowing through the water supply pipe, And a plurality of hot water supply units each having a tapping-side on-off valve for opening and closing the tapping pipe,
A hot water supply system comprising a control unit for detecting water leakage of each hot water supply unit,
The control unit, when all the hot water supply units are in the non-operation state, at least the minimum number of the hot water supply units , based on the operation information of each hot water supply unit, causes the tapping side opening / closing valve to be in a standby state in an open state,
At least one hot water supply unit other than the hot water supply unit that causes the hot water supply side opening / closing valve to wait in the open state, wherein the hot water supply side opening / closing valve of the hot water supply unit in which the continuous operation time is equal to or longer than the predetermined determination time is caused to wait in the closed state. Thus, there is provided a coupled hot water supply system for determining water leakage based on an output from a water supply amount detecting means of a hot water supply unit in which a tapping side opening / closing valve is in a closed state.
上記連結給湯システムによれば、全ての給湯ユニットが非稼動状態にある場合、すなわち、給湯運転が行われていないときに、少なくとも最低台数の給湯ユニットは出湯側開閉弁を開弁状態で待機させるから、給水管及び出湯管を含む通水回路は通水可能状態となっている。従って、少なくとも1箇所の給湯先を開栓すれば、出湯側開閉弁を開弁状態で待機させている給湯ユニットを直ちに稼動させて、給湯運転を開始させることができる。
また、上記連結給湯システムによれば、各給湯ユニットの稼動情報に基づき、給湯運転の停止中、出湯側開閉弁を開弁状態で待機させる最低台数の給湯ユニットを設定するから、給湯先が開栓されて給湯需要が生じたときに最初に稼動させる給湯ユニットは固定されない。それゆえ、出湯側開閉弁を閉弁状態で待機させる給湯ユニットも固定されないから、全ての給湯ユニットの漏水を判定できる。
また、上記連結給湯システムによれば、全ての給湯ユニットが非稼動状態にある場合、出湯側開閉弁を開弁状態で待機させる給湯ユニット以外の少なくとも1台の給湯ユニットであって継続運転時間が所定の判定時間以上である給湯ユニットの出湯側開閉弁を閉弁状態で待機させるから、給水管及び出湯管を含む通水回路は漏水がなければ止水状態となっている。従って、出湯側開閉弁を閉弁状態で待機させている給湯ユニットの給水量検知手段からの出力により漏水を判定できる。
According to the above-described combined hot water supply system, when all the hot water supply units are in the non-operation state, that is, when the hot water supply operation is not being performed, at least the minimum number of hot water supply units have the tapping-side open / close valve in an open state and wait. Therefore, the water flow circuit including the water supply pipe and the hot water pipe is in a water-permeable state. Therefore, if at least one hot water supply destination is opened, the hot water supply unit that has the hot water outlet opening / closing valve on standby in the open state can be immediately operated to start the hot water supply operation.
In addition, according to the above-described combined hot water supply system, the minimum number of hot water supply units that set the tapping side opening / closing valve to be in the open state while the hot water supply operation is stopped is set based on the operation information of each hot water supply unit. The hot water supply unit which is first operated when hot water demand is generated by being plugged is not fixed. Therefore, the hot water supply unit that makes the hot water side opening / closing valve stand by in the closed state is not fixed, so that it is possible to determine the water leakage of all the hot water supply units.
In addition, according to the above-described combined hot water supply system, when all the hot water supply units are in the non-operation state, at least one hot water supply unit other than the hot water supply unit that causes the tapping-side opening / closing valve to be in an open state and has a continuous operation time Is kept in a closed state with the tapping-side opening / closing valve of the hot water supply unit being longer than the predetermined determination time. Therefore, the water passage circuit including the water supply pipe and the tapping pipe is in a water stop state if there is no leakage. Therefore, it is possible to determine the water leakage based on the output from the water supply amount detecting means of the hot water supply unit in which the tapping-side opening / closing valve is kept on standby in the closed state.
以上のように、本発明によれば、複数の給湯ユニットが連結された連結給湯システムにおいて、円滑な給湯運転を確保しつつ、低コストで、各給湯ユニットの漏水を判定できる。   As described above, according to the present invention, in a connected hot water supply system in which a plurality of hot water supply units are connected, it is possible to determine the water leakage of each hot water supply unit at low cost while ensuring a smooth hot water supply operation.
図1は、本発明の実施の形態に係る連結給湯システムの一例を示す概略模式図である。FIG. 1 is a schematic diagram showing an example of a connected hot water supply system according to an embodiment of the present invention. 図2は、本発明の実施の形態に係る連結給湯システムを構成する給湯ユニットの一例を示す概略構成図である。FIG. 2 is a schematic configuration diagram illustrating an example of a hot water supply unit included in the coupled hot water supply system according to the embodiment of the present invention. 図3は、本発明の実施の形態に係る連結給湯システムの漏水チェックにおける制御動作の一例を示すフローチャートである。FIG. 3 is a flowchart illustrating an example of a control operation in the water leak check of the connected hot water supply system according to the embodiment of the present invention.
以下、本実施の形態の連結給湯システムを、図面を参照しながら説明する。
図1に示すように、本実施の形態の連結給湯システムは、ケーシング内に2台の給湯ユニット1aが並列に連結された給湯装置1と、給湯装置1と接続された複数の蛇口6と、給湯温度等を設定するリモコン8とを備える。各給湯ユニット1aの給水管3は、図示しない給水源と繋がり、所定の給水圧が作用する給水主配管300から分岐接続されており、各給湯ユニット1aの出湯管4は、給湯先の複数の蛇口6と接続された出湯主配管400から分岐接続されている。また、各給湯ユニット1aのガス供給管5は、ガス主配管500から分岐接続されている。連結させる給湯ユニット1aの台数は、必要とされる給湯能力に応じて適宜、設定される。なお、本実施の形態では、1つのケーシング内で2台の給湯ユニット1aが連結された給湯装置1が用いられているが、1つのケーシングに1台の給湯ユニット1aが収容されたものを複数、連結させてもよい。
Hereinafter, the connected hot water supply system of the present embodiment will be described with reference to the drawings.
As shown in FIG. 1, the connected hot water supply system of the present embodiment includes a hot water supply device 1 in which two hot water supply units 1 a are connected in parallel in a casing, a plurality of faucets 6 connected to the hot water supply device 1, A remote controller 8 for setting hot water supply temperature and the like. The water supply pipe 3 of each hot water supply unit 1a is connected to a water supply source (not shown) and is branched and connected from a main water supply pipe 300 on which a predetermined water supply pressure is applied. The hot water supply pipe 4 of each hot water supply unit 1a has a plurality of hot water supply destinations. A branch connection is made from a tapping main pipe 400 connected to the faucet 6. The gas supply pipe 5 of each hot water supply unit 1a is branched from the gas main pipe 500. The number of hot water supply units 1a to be connected is appropriately set according to required hot water supply capacity. In the present embodiment, hot water supply apparatus 1 in which two hot water supply units 1a are connected in one casing is used, but a plurality of units in which one hot water supply unit 1a is accommodated in one casing are used. , May be connected.
給湯装置1には、リモコン8と接続された連結制御ユニット2が設けられており、連結制御ユニット2は各給湯ユニット1aに設けられた後述する個別制御ユニット7と接続されている。なお、複数の給湯装置1を連結させる場合、1つの給湯装置1に親機としての連結制御ユニット2を設け、他の給湯装置に連結制御ユニット2と通信接続するための子機制御ユニットを設けてもよい。   The hot water supply device 1 is provided with a connection control unit 2 connected to a remote controller 8, and the connection control unit 2 is connected to an individual control unit 7 described later provided in each hot water supply unit 1a. When a plurality of hot water heaters 1 are connected, one hot water heater 1 is provided with a connection control unit 2 as a parent machine, and another hot water heater is provided with a slave unit control unit for communication connection with the connection control unit 2. You may.
図2は、給湯装置1の構造を示す概略構成図であり、2台の給湯ユニット1aが並列に連結されている。各給湯ユニット1aは、同一の構成を有するため、同一の部材については、同一の引用番号を付して説明を省略する。   FIG. 2 is a schematic configuration diagram showing the structure of the hot water supply apparatus 1, in which two hot water supply units 1a are connected in parallel. Since each hot water supply unit 1a has the same configuration, the same members are denoted by the same reference numerals and description thereof is omitted.
給湯ユニット1aは、缶体9内に、ガス供給管5から供給された燃料ガスを燃焼させて燃焼ガスを生成するガスバーナ11と、熱交換器10と、ガスバーナ11に点火するための点火プラグ12と、点火プラグ12に高電圧を印加するイグナイタ13と、ガスバーナ11の燃焼炎の有無を検知するフレームロッド14と、ガスバーナ11に燃焼用空気を供給する燃焼ファン15と、給湯ユニット1aの稼動を制御する個別制御ユニット7とを備える。   The hot water supply unit 1a includes a gas burner 11 that burns fuel gas supplied from the gas supply pipe 5 to generate a combustion gas, a heat exchanger 10, and a spark plug 12 for igniting the gas burner 11 in the can body 9. And an igniter 13 for applying a high voltage to the ignition plug 12, a frame rod 14 for detecting the presence or absence of a combustion flame of the gas burner 11, a combustion fan 15 for supplying combustion air to the gas burner 11, and an operation of the hot water supply unit 1a. And an individual control unit 7 for controlling.
ガスバーナ11は、第1から第3の3つのバーナブロック11a,11b,11cにより構成されている。ガス供給管5には、燃料ガスが供給されるガス供給管5を開閉する元電磁弁41と、ガス供給管5の開度を調節するガス比例弁43とが介設されている。ガス供給管5の下流部分は、第1〜第3の3つのバーナブロック11a〜11cに向かって三又に分岐する分岐路となっている。   The gas burner 11 includes first to third burner blocks 11a, 11b, and 11c. The gas supply pipe 5 is provided with a main solenoid valve 41 for opening and closing the gas supply pipe 5 to which the fuel gas is supplied, and a gas proportional valve 43 for adjusting the opening of the gas supply pipe 5. The downstream portion of the gas supply pipe 5 is a branch path that branches into three branches toward the first to third three burner blocks 11a to 11c.
第1バーナブロック11aに接続される分岐路には、第1バーナブロック11aへの燃料ガスの供給と遮断を切換える第1切換電磁弁44aが介設されている。第2バーナブロック11bに接続される分岐路には、第2バーナブロック11bへの燃料ガスの供給と遮断を切換える第2切換電磁弁44bが介設されている。第3バーナブロック11cに接続される分岐路には、第3バーナブロック11cへの燃料ガスの供給と遮断を切換える第3切換電磁弁44cが介設されている。   A first switching solenoid valve 44a for switching between supply and cutoff of the fuel gas to the first burner block 11a is provided on a branch path connected to the first burner block 11a. A second switching solenoid valve 44b for switching between supply and cutoff of the fuel gas to the second burner block 11b is provided on the branch path connected to the second burner block 11b. A third switching electromagnetic valve 44c for switching between supply and cutoff of the fuel gas to the third burner block 11c is provided on the branch path connected to the third burner block 11c.
熱交換器10は、ガスバーナ11の直上位置に配設された顕熱熱交換器101と、顕熱熱交換器101の上方に配設された潜熱熱交換器102とを有する。また、顕熱熱交換器101の上方位置で、潜熱熱交換器102の下方位置には、給湯ユニット1aの稼動時に潜熱熱交換器102から滴下したドレンを集めるためのドレン受皿50が配設され、ドレン受皿50に滴下したドレンは、ドレン導出管51を介して中和器52に排出される。   The heat exchanger 10 has a sensible heat exchanger 101 disposed immediately above the gas burner 11 and a latent heat exchanger 102 disposed above the sensible heat exchanger 101. In addition, a drain tray 50 for collecting drain dropped from the latent heat exchanger 102 when the hot water supply unit 1a is operating is disposed above the sensible heat exchanger 101 and below the latent heat exchanger 102. The drain dropped onto the drain tray 50 is discharged to the neutralizer 52 via the drain outlet pipe 51.
給湯ユニット1aは、給湯用水が流れる通水回路を備えており、既述した熱交換器10に水を供給する給水管3、及び熱交換器10から湯水を出湯する出湯管4は、通水回路の一部を構成している。また、顕熱熱交換器101と潜熱熱交換器102とは、潜熱熱交換器102が通水回路の上流側に位置するように通水回路の一部に直列に接続されている。顕熱熱交換器101及び潜熱熱交換器102はそれぞれ、燃焼ガスから顕熱及び潜熱を回収して、通水回路を流れる水を加熱する。   The hot water supply unit 1a includes a water supply circuit through which hot water flows, and the water supply pipe 3 that supplies water to the heat exchanger 10 and the tap water pipe 4 that supplies hot water from the heat exchanger 10 include a water supply circuit. It forms part of the circuit. The sensible heat exchanger 101 and the latent heat exchanger 102 are connected in series to a part of the water flow circuit so that the latent heat exchanger 102 is located on the upstream side of the water flow circuit. The sensible heat exchanger 101 and the latent heat exchanger 102 respectively recover the sensible heat and the latent heat from the combustion gas and heat the water flowing through the water flow circuit.
給水管3には、給水管3を流れる水の給水量を検知する給水量センサ(給水量検知手段)20と給水管3から供給される水の温度を検知する給水温度センサ21とが備えられている。出湯管4における顕熱熱交換器101の出口近傍には、顕熱熱交換器101による加熱直後の湯水の出湯温度を検知する熱交温度センサ16が設けられている。また、給水管3と出湯管4との間には、給水管3に供給される水の一部を熱交換器10を通過させることなく、出湯管4に混入させるバイパス管30と、バイパス管30の開度を調節するバイパスサーボ弁22が介設されている。さらに、出湯管4には、出湯管4とバイパス管30との合流部よりも下流側に、過圧逃がし弁33と、出湯管4から蛇口6に供給される湯水の温度を検知する出湯温度センサ32と、出湯管4を流れる湯水の出湯量を調整する湯量サーボ弁(出湯側開閉弁)31とが設けられている。   The water supply pipe 3 includes a water supply amount sensor (water supply amount detection means) 20 for detecting a water supply amount of water flowing through the water supply pipe 3 and a water supply temperature sensor 21 for detecting a temperature of water supplied from the water supply pipe 3. ing. In the vicinity of the outlet of the sensible heat exchanger 101 in the tapping pipe 4, a heat exchange temperature sensor 16 for detecting tapping temperature of tap water immediately after heating by the sensible heat exchanger 101 is provided. Further, between the water supply pipe 3 and the tapping pipe 4, a bypass pipe 30 for mixing a part of the water supplied to the water supply pipe 3 into the tapping pipe 4 without passing through the heat exchanger 10, A bypass servo valve 22 for adjusting the opening of the valve 30 is provided. Further, the tapping pipe 4 has an overpressure relief valve 33 downstream of the junction of the tapping pipe 4 and the bypass pipe 30 and a tapping temperature for detecting the temperature of hot water supplied from the tapping pipe 4 to the faucet 6. A sensor 32 and a hot water volume servo valve (a hot water opening / closing valve) 31 for adjusting the hot water volume flowing through the hot water pipe 4 are provided.
個別制御ユニット7は、マイクロコンピュータ等により構成される電子ユニットである。個別制御ユニット7には、連結制御ユニット2から給湯ユニット1aの運転/停止や運転条件の設定等を指示する信号が入力され、また、フレームロッド14、熱交温度センサ16、給水量センサ20、給水温度センサ21、出湯温度センサ32等からの検知信号が入力される。   The individual control unit 7 is an electronic unit including a microcomputer and the like. The individual control unit 7 receives a signal from the connection control unit 2 for instructing operation / stop of the hot water supply unit 1a and setting of operation conditions, and the like. The individual control unit 7 also includes a frame rod 14, a heat exchange temperature sensor 16, a water supply amount sensor 20, Detection signals from the water supply temperature sensor 21, the hot water temperature sensor 32, and the like are input.
また、個別制御ユニット7から出力される制御信号によって、イグナイタ13、燃焼ファン15、バイパスサーボ弁22、湯量サーボ弁31、元電磁弁41、ガス比例弁43、第1切換電磁弁44a、第2切換電磁弁44b、及び第3切換電磁弁44cの作動が制御される。そして、個別制御ユニット7は、第1切換電磁弁44a、第2切換電磁弁44b、及び第3切換電磁弁44cの開閉作動状況と、ガス比例弁43の開度からガスバーナ11の燃焼量を検知する。   In addition, the igniter 13, the combustion fan 15, the bypass servo valve 22, the hot water quantity servo valve 31, the original solenoid valve 41, the gas proportional valve 43, the first switching solenoid valve 44a, the second switching solenoid valve are controlled by the control signal output from the individual control unit 7. The operations of the switching solenoid valve 44b and the third switching solenoid valve 44c are controlled. The individual control unit 7 detects the amount of combustion of the gas burner 11 from the opening / closing operation status of the first switching solenoid valve 44a, the second switching solenoid valve 44b, and the third switching solenoid valve 44c, and the opening degree of the gas proportional valve 43. I do.
個別制御ユニット7は、マイクロコンピュータにより予めメモリに記憶されたプログラムを実行する。より詳細には、個別制御ユニット7は、湯量サーボ弁31が開弁状態にあり、通水回路が通水可能状態にある給湯ユニット1aで、給水量センサ20により検知される水の流量が予め設定された最低作動水量以上となると、燃焼ファン15によりガスバーナ11に燃焼用空気を供給し、イグナイタ13により点火プラグ12に高電圧を印加して火花放電を生じさせた状態で、元電磁弁41及び第1〜第3切換電磁弁44a〜44cを開弁して、ガスバーナ11に点火する。   The individual control unit 7 executes a program stored in a memory in advance by a microcomputer. More specifically, the individual control unit 7 controls the flow rate of water detected by the water supply amount sensor 20 in advance in the hot water supply unit 1a in which the hot water amount servo valve 31 is in the open state and the water supply circuit is in a water permeable state. When the amount becomes equal to or more than the set minimum working water amount, the combustion fan 15 supplies combustion air to the gas burner 11, and the igniter 13 applies a high voltage to the ignition plug 12 to generate spark discharge. Then, the first to third switching electromagnetic valves 44a to 44c are opened to ignite the gas burner 11.
そして、個別制御ユニット7は、出湯温度センサ22により検知される出湯管4を流れる湯水の温度が、リモコン8で設定された給湯温度となるように、第1〜第3切換電磁弁44a〜44cの開閉とガス比例弁43の開度の調節と燃焼ファン15の回転数の調節を行って、ガスバーナ11の燃焼量を制御する。また、個別制御ユニット7は、給水量センサ20により検知される給水管3を流れる水の給水量が最低作動水量よりも少なくなると、元電磁弁41、ガス比例弁43、第1切換電磁弁44a、第2切換電磁弁44b、及び第3切換電磁弁44cを閉弁してガスバーナ11の燃焼を停止する。   Then, the individual control unit 7 controls the first to third switching solenoid valves 44 a to 44 c so that the temperature of the hot water flowing through the hot water pipe 4 detected by the hot water temperature sensor 22 becomes the hot water supply temperature set by the remote controller 8. , The opening of the gas proportional valve 43 and the rotation speed of the combustion fan 15 are adjusted to control the amount of combustion of the gas burner 11. When the amount of water flowing through the water supply pipe 3 detected by the water supply amount sensor 20 is smaller than the minimum operating water amount, the individual control unit 7 sets the original solenoid valve 41, the gas proportional valve 43, and the first switching solenoid valve 44a. The second switching electromagnetic valve 44b and the third switching electromagnetic valve 44c are closed to stop the combustion of the gas burner 11.
連結制御ユニット2は、各給湯ユニット1aの個別制御ユニット7と通信自在に接続され、各給湯ユニット1aを制御する。図1においていずれかの蛇口6が開けられ、湯量サーボ弁31が開弁状態にあり、通水回路が通水可能状態となっている給水管3内を水が流れると、その給湯ユニット1aの個別制御ユニット7は、連結制御ユニット2に対して、給水量センサ20によって検知された水の給水量を示す給水量データを送信する。給水量データは、給水管3から各給湯ユニット1aに供給される水の給水量の範囲によって、例えば「低」、「中」、及び「高」の3段階のうちいずれかが設定される。   The connection control unit 2 is communicably connected to the individual control unit 7 of each hot water supply unit 1a and controls each hot water supply unit 1a. In FIG. 1, when one of the faucets 6 is opened, the hot water volume servo valve 31 is in an open state, and water flows through the water supply pipe 3 in a water flowable state, the water supply unit 1a of the water supply unit 1a is opened. The individual control unit 7 transmits water supply amount data indicating the water supply amount detected by the water supply amount sensor 20 to the connection control unit 2. The water supply amount data is set to, for example, one of three levels of “low”, “medium”, and “high” according to the range of the amount of water supplied from the water supply pipe 3 to each of the hot water supply units 1a.
本実施の形態の連結給湯システムにおいては、例えば、2台の給湯ユニット1aのうち、一方の給湯ユニット1aの湯量サーボ弁31が開弁状態で通水回路が通水可能状態にあり、他方の給湯ユニット1aの湯量サーボ弁31が閉弁状態で通水回路が止水状態にあるとき、湯量サーボ弁31が開弁状態にある給湯ユニット1aから稼動が開始される。   In the coupled hot water supply system of the present embodiment, for example, of the two hot water supply units 1a, the hot water volume servo valve 31 of one of the hot water supply units 1a is in an open state, the water passage circuit is in a water permeable state, and the other is. When the hot water level servo valve 31 of the hot water supply unit 1a is closed and the water passage circuit is in the water stop state, the operation starts from the hot water supply unit 1a in which the hot water level servo valve 31 is in the open state.
そして、稼動を開始した1台の給湯ユニット1aにおける給水量センサ20で検知される給水量が「中」の範囲内であるときは、連結制御ユニット2は、1台の給湯ユニット1aのみが稼動している状態で給湯運転を維持する。また、1台の給湯ユニット1aが稼動状態で、稼動中の給湯ユニット1aの給水量センサ20で検知される給水量が「高」に増加すると、連結制御ユニット2は、非稼動状態の給湯ユニット1aの個別制御ユニット7に湯量サーボ弁31を開弁させて、その給湯ユニット1aの稼動を開始させる。   When the water supply amount detected by the water supply amount sensor 20 in one of the hot water supply units 1a started to operate is within the range of "medium", the connection control unit 2 operates only one of the hot water supply units 1a. Maintain the hot water supply operation. When one hot water supply unit 1a is operating and the water supply amount detected by the water supply amount sensor 20 of the active hot water supply unit 1a increases to “high”, the connection control unit 2 sets the non-operational hot water supply unit The hot water supply servo valve 31 is opened by the individual control unit 7a to start the operation of the hot water supply unit 1a.
一方、蛇口6からの出湯量が減少し、2台の給湯ユニット1aの給水量のいずれかが減少して「低」の範囲に入ると、連結制御ユニット2は、最初に点火させた給湯ユニット1aの個別制御ユニット7に湯量サーボ弁31を閉弁させ、後から点火させた給湯ユニット1aのみが稼動している状態で給湯運転を維持する。また、全ての蛇口6が閉栓され、稼動中の1台の給湯ユニット1aの給水量センサ20で検知される給水量が最低作動水量未満になると、ガスバーナ11への燃料ガスの供給を停止して、給湯運転を停止させる。従って、各給湯ユニット1aの湯量サーボ弁31は、給湯運転開始前と逆の開閉状態となるが、給湯運転が停止され、全ての給湯ユニット1aが非稼動状態になると、連結制御ユニット2は、各給湯ユニット1aの継続稼動時間が所定の判定時間以上かどうかに基づき、待機状態における湯量サーボ弁31の開閉状態を設定する。上記判定時間は、給湯ユニット1aの経年劣化を考慮して、適宜、設定される。   On the other hand, when the amount of hot water from faucet 6 decreases and any of the amounts of water supplied from two hot water supply units 1a decreases and enters a range of “low”, connection control unit 2 causes first hot water supply unit to be ignited. The hot water supply servo valve 31 is closed by the individual control unit 7a, and the hot water supply operation is maintained in a state where only the hot water supply unit 1a that is ignited later is operating. Further, when all the faucets 6 are closed and the water supply amount detected by the water supply amount sensor 20 of one hot water supply unit 1a being operated becomes less than the minimum operation water amount, the supply of the fuel gas to the gas burner 11 is stopped. , Stop the hot water supply operation. Therefore, although the hot water level servo valve 31 of each hot water supply unit 1a is in the open / close state opposite to that before the start of the hot water supply operation, when the hot water supply operation is stopped and all the hot water supply units 1a are in the non-operation state, the connection control unit 2 The open / close state of the hot water volume servo valve 31 in the standby state is set based on whether the continuous operation time of each hot water supply unit 1a is equal to or longer than a predetermined determination time. The determination time is appropriately set in consideration of aging of the hot water supply unit 1a.
なお、本実施の形態では、連結制御ユニット2及び個別制御ユニット7が漏水を判定する制御ユニットとして機能するが、連結制御ユニット2は、いずれかの給湯ユニット1aの個別制御ユニット7がその機能を担うように構成することもできる。   In the present embodiment, the connection control unit 2 and the individual control unit 7 function as a control unit for determining water leakage, but the connection control unit 2 has the function of the individual control unit 7 of any of the hot water supply units 1a. It can also be configured to carry.
各個別制御ユニット7は、異常状態を検知すると異常状態情報を連結制御ユニット2に送信する。異常状態情報を受信した連結制御ユニット2は、異常状態のため稼動できない給湯ユニット1aと、正常に稼動可能な給湯ユニット1aとを区別してメモリ等の記憶装置に記録する。また、連結制御ユニット2は、各種の異常状態情報に対応するエラーコードが複数記憶されたデータテーブルを備えている。   When detecting an abnormal state, each individual control unit 7 transmits abnormal state information to the connection control unit 2. Upon receiving the abnormal state information, the connection control unit 2 distinguishes the hot water supply unit 1a that cannot be operated due to the abnormal state from the hot water supply unit 1a that can be normally operated and records them in a storage device such as a memory. Further, the connection control unit 2 includes a data table in which a plurality of error codes corresponding to various types of abnormal state information are stored.
リモコン8には、給湯温度が表示される液晶表示部8aが設けられている。連結制御ユニット2は、各給湯ユニット1aの個別制御ユニット7から異常状態情報が送信された場合には、給湯温度に代えて異常状態情報に対応するエラーコードを液晶表示部8aに表示させる。   The remote control 8 is provided with a liquid crystal display section 8a for displaying the hot water supply temperature. When abnormal state information is transmitted from individual control unit 7 of each hot water supply unit 1a, connection control unit 2 causes liquid crystal display unit 8a to display an error code corresponding to the abnormal state information instead of hot water supply temperature.
次に、本実施の形態の連結給湯システムにおける給湯ユニット1aの漏水チェックの制御動作について図3のフローチャートを参照して説明する。なお、本実施の形態の連結給湯システムでは、給湯運転が停止するごとに漏水チェックが実行されるようにプログラムされている。   Next, a control operation of a water leak check of hot water supply unit 1a in the coupled hot water supply system of the present embodiment will be described with reference to a flowchart of FIG. In addition, in the coupled hot water supply system of the present embodiment, it is programmed such that a water leak check is performed each time the hot water supply operation is stopped.
給湯運転が停止して、各個別制御ユニット7から連結制御ユニット2への出力により全ての給湯ユニット1aが非稼動状態にある場合、各個別制御ユニット7は、連結制御ユニット2から湯量サーボ弁31の閉弁信号が出力されているかどうかを確認し、閉弁信号が出力されていない場合(ステップST1で、No)、メモリに記憶された各給湯ユニット1aの継続稼動時間を確認する(ステップST2)。そして、1台の給湯ユニット1aの継続稼動時間が所定の判定時間(例えば、100時間)以上である場合、その給湯ユニット1aの個別制御ユニット7に湯量サーボ弁31を閉弁させる(ステップST3)。なお、図示しないが、給湯運転停止時に湯量サーボ弁31が閉弁状態の給湯ユニット1aの稼働時間も判定時間以上である場合、漏水チェック終了後に、最も短い継続稼働時間の給湯ユニット1aの湯量サーボ弁31を開弁させる。   When the hot water supply operation is stopped and all the hot water supply units 1a are in the non-operation state by the output from each individual control unit 7 to the connection control unit 2, each individual control unit 7 It is confirmed whether or not the valve closing signal is output. If the valve closing signal is not output (No in step ST1), the continuous operation time of each hot water supply unit 1a stored in the memory is confirmed (step ST2). ). When the continuous operation time of one hot water supply unit 1a is equal to or longer than a predetermined determination time (for example, 100 hours), the individual control unit 7 of the hot water supply unit 1a closes the hot water volume servo valve 31 (step ST3). . Although not shown, when the operation time of the hot water supply unit 1a with the hot water level servo valve 31 closed when the hot water supply operation is stopped is also equal to or longer than the determination time, after the water leakage check is completed, the hot water supply servo of the hot water supply unit 1a with the shortest continuous operation time is completed. The valve 31 is opened.
次いで、湯量サーボ弁31が閉弁状態の給湯ユニット1aの個別制御ユニット7は、給水量センサ20からの出力をモニタし、所定の漏水判定給水量以上(例えば、2L/分以上)の給水量が、所定の漏水判定時間以上(例えば、100秒以上)継続するかどうか判定する(ステップST4)。湯量サーボ弁31が閉弁状態であるにも関わらず、給水量センサ20からの出力により漏水が検知されると(ステップST4で、Yes)、個別制御ユニット7は、連結制御ユニット2に漏水エラーコードを出力する。漏水エラーコードを受信した連結制御ユニット2は、リモコン8の液晶表示部8aに、漏水エラーコードを表示させる(ステップST5)。   Next, the individual control unit 7 of the hot water supply unit 1a with the hot water volume servo valve 31 closed is monitoring the output from the water supply amount sensor 20, and the water supply amount is equal to or more than a predetermined water leakage determination water supply amount (for example, 2 L / min or more). Is determined to continue for a predetermined water leakage determination time (for example, 100 seconds or more) (step ST4). If water leakage is detected by the output from the water supply amount sensor 20 in spite of the fact that the hot water amount servo valve 31 is in the closed state (Yes in step ST4), the individual control unit 7 sends a water leakage error to the connection control unit 2. Output the code. The connection control unit 2 that has received the water leakage error code causes the liquid crystal display unit 8a of the remote controller 8 to display the water leakage error code (step ST5).
以上詳細に説明したように、本実施の形態の連結給湯システムによれば、連結給湯システムで給湯運転が行われておらず、全ての給湯ユニット1aが非稼動状態にある場合、少なくとも1台の給湯ユニット1aは、通水回路が通水可能状態となるように湯量サーボ弁31を開弁状態で待機させるから、蛇口6を開栓させれば、直ちに給湯ユニット1aの稼動を開始させることができる。   As described in detail above, according to the coupled hot water supply system of the present embodiment, when the hot water supply operation is not performed in the coupled hot water supply system and all the hot water supply units 1a are in the non-operation state, at least one The hot water supply unit 1a allows the hot water supply servo valve 31 to be on standby in the open state so that the water supply circuit is in a water permeable state. Therefore, if the faucet 6 is opened, the operation of the hot water supply unit 1a can be started immediately. it can.
また、全ての給湯ユニット1aが非稼動状態にある場合、少なくとも1台の給湯ユニット1aは、通水回路が止水状態となるように湯量サーボ弁31を閉弁状態で待機させているから、給水量センサ20で所定以上の給水量が検知されれば、給湯ユニット1aの通水回路で漏水が生じていると判定できる。   In addition, when all the hot water supply units 1a are in the non-operation state, at least one hot water supply unit 1a keeps the hot water volume servo valve 31 in a closed state so that the water passage circuit is in a water shutoff state. If the water supply amount sensor 20 detects a water supply amount equal to or more than a predetermined amount, it can be determined that water leakage has occurred in the water supply circuit of the hot water supply unit 1a.
さらに、本実施の形態の連結給湯システムによれば、全ての給湯ユニット1aが非稼動状態にある場合、各給湯ユニット1aの稼動時間に基づき、湯量サーボ弁31を開弁状態で待機させる給湯ユニット1aを設定するから、いずれの給湯ユニット1aも一定の間隔で漏水を判定できる。   Furthermore, according to the coupled hot water supply system of the present embodiment, when all the hot water supply units 1a are in the non-operation state, the hot water supply unit that causes the hot water quantity servo valve 31 to be in the open state based on the operation time of each hot water supply unit 1a. Since 1a is set, any of the hot water supply units 1a can determine the water leakage at regular intervals.
従って、本実施の形態の連結給湯システムによれば、給湯先の開閉を判定するための判定手段を別途設けることなく、蛇口6を開栓することにより、給湯運転を直ちに開始できる。また、漏水の判定を行うために、通水回路に三方弁などの高価な開閉手段を設ける必要もない。これにより、円滑な給湯運転を確保しつつ、低コストで、各給湯ユニット1aの漏水を確実に判定できる。   Therefore, according to the coupled hot water supply system of the present embodiment, the hot water supply operation can be started immediately by opening the faucet 6 without separately providing a determination means for determining whether the hot water supply destination is open or closed. Further, it is not necessary to provide an expensive opening / closing means such as a three-way valve in the water passage circuit in order to determine the water leakage. Thereby, it is possible to reliably determine the water leakage of each hot water supply unit 1a at a low cost while ensuring a smooth hot water supply operation.
(その他の実施の形態)
(1)上記実施の形態では、各給湯ユニットの稼動情報として継続稼動時間を利用したが、稼動順序、稼動出湯量や稼動熱量などの他の稼働情報を利用してもよい。
(2)上記実施の形態では、給湯ユニット2台が連結された基本的な連結給湯システムについて説明したが、3台以上の給湯ユニットが連結された連結給湯システムの場合、必要とされる給湯能力に応じて出湯側開閉弁を閉弁状態とする最低台数の給湯ユニットは複数台としてもよい。
(Other embodiments)
(1) In the above embodiment, the continuous operation time is used as the operation information of each hot water supply unit. However, other operation information such as the operation order, the operation hot water supply amount, and the operation heat amount may be used.
(2) In the above embodiment, a basic connected hot water supply system in which two hot water supply units are connected has been described, but in the case of a connected hot water supply system in which three or more hot water supply units are connected, required hot water supply capacity The number of hot water supply units of the minimum number of which the tapping side opening / closing valve is closed may be plural.
1a 給湯ユニット
2 連結制御ユニット
3 給水管
4 出湯管
7 個別制御ユニット
10 熱交換器
11 バーナ
20 給水量センサ(給水量検知手段)
31 湯量サーボ弁(出湯側開閉弁)
1a Hot water supply unit 2 Connection control unit 3 Water supply pipe 4 Hot water supply pipe 7 Individual control unit 10 Heat exchanger 11 Burner 20 Water supply amount sensor (water supply amount detection means)
31 Hot water volume servo valve (opening side opening / closing valve)

Claims (1)

  1. バーナ、熱交換器、熱交換器に水を供給する給水管、熱交換器から湯水を出湯する出湯管、給水管を流れる水の給水量を検知する給水量検知手段、及び出湯管を開閉する出湯側開閉弁を各別に有する複数台の給湯ユニットと、
    各給湯ユニットの漏水を検知する制御ユニットとを備える連結給湯システムであって、
    制御ユニットは、全ての給湯ユニットが非稼動状態にある場合、各給湯ユニットの稼動情報に基づき少なくとも最低台数の給湯ユニットは出湯側開閉弁を開弁状態で待機させ、
    出湯側開閉弁を開弁状態で待機させる給湯ユニット以外の少なくとも1台の給湯ユニットであって継続運転時間が所定の判定時間以上である給湯ユニットの出湯側開閉弁を閉弁状態で待機させて、出湯側開閉弁が閉弁状態にある給湯ユニットの給水量検知手段からの出力に基づき漏水を判定する連結給湯システム。
    A burner, a heat exchanger, a water supply pipe for supplying water to the heat exchanger, a water supply pipe for supplying hot water from the heat exchanger, a water supply amount detecting means for detecting a water supply amount of water flowing through the water supply pipe, and a water supply pipe. A plurality of hot water supply units each having a tapping side opening / closing valve separately,
    A hot water supply system comprising a control unit for detecting water leakage of each hot water supply unit,
    The control unit, when all the hot water supply units are in the non-operation state, at least the minimum number of the hot water supply units , based on the operation information of each hot water supply unit, causes the tapping side opening / closing valve to be in a standby state in an open state,
    At least one hot water supply unit other than the hot water supply unit that causes the hot water supply side opening / closing valve to wait in the open state, wherein the hot water supply side opening / closing valve of the hot water supply unit in which the continuous operation time is equal to or longer than the predetermined determination time is caused to wait in the closed state. And a hot water supply system in which the hot water supply side on-off valve is in a closed state, and a water leak is determined based on an output from a water supply amount detection means of the hot water supply unit.
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