JP2590660B2 - Parallel water heater - Google Patents

Parallel water heater

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Publication number
JP2590660B2
JP2590660B2 JP4019543A JP1954392A JP2590660B2 JP 2590660 B2 JP2590660 B2 JP 2590660B2 JP 4019543 A JP4019543 A JP 4019543A JP 1954392 A JP1954392 A JP 1954392A JP 2590660 B2 JP2590660 B2 JP 2590660B2
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JP
Japan
Prior art keywords
water
flow rate
water heater
hot water
heaters
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
JP4019543A
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Japanese (ja)
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JPH06281249A (en
Inventor
忠彦 大塩
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Noritz Corp
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Noritz Corp
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Priority to JP4019543A priority Critical patent/JP2590660B2/en
Publication of JPH06281249A publication Critical patent/JPH06281249A/en
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Publication of JP2590660B2 publication Critical patent/JP2590660B2/en
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  • Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【０００１】[0001]

【産業上の利用分野】本発明は並列型給湯装置に関す
る。詳しくは、複数台の給湯器を並列に配置することに
より給湯能力を大能力にした並列型給湯装置に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parallel type hot water supply apparatus. More specifically, the present invention relates to a parallel-type hot water supply apparatus in which hot water supply capacity is increased by arranging a plurality of hot water heaters in parallel.

【０００２】[0002]

【従来の技術】並列型給湯装置の従来例としては、特開
昭６３−２７３７５７号公報に開示されたものがある
（図示せず）。この並列型給湯装置は、流量によって台
数切替え判定を行なっている。すなわち、入水管と出湯
管との間に２台の給湯器を並列に接続してあり、入水管
に設けられた総水量測定センサによって測定している総
水量が１台の給湯器の最低作動水量を越えると１号給湯
器のバーナを点火し、この１号給湯器から給湯する。こ
の時、２号給湯器は、過流出防止弁を閉止され、２号給
湯器側へ水が流れないようにしている。2. Description of the Related Art As a conventional example of a parallel type hot water supply apparatus, there is one disclosed in Japanese Patent Application Laid-Open No. 63-273775 (not shown). In this parallel hot water supply apparatus, the number switching determination is performed based on the flow rate. That is, two water heaters are connected in parallel between the inlet pipe and the outlet pipe, and the total amount of water measured by the total water amount measurement sensor provided on the inlet pipe is the minimum operation of one water heater. When the amount of water is exceeded, the burner of the first water heater is ignited and hot water is supplied from the first water heater. At this time, the overflow prevention valve of the No. 2 water heater is closed to prevent water from flowing to the No. 2 water heater.

【０００３】さらに、総水量が２台の最低作動水量の和
を越えると、２号給湯器の過流出防止弁が開かれて２号
給湯器に水が流れ、２号給湯器のバーナが点火される。
この結果、１号給湯器と２号給湯器によって大能力給湯
が可能になる。Further, when the total water amount exceeds the sum of the minimum operating water amounts of the two water heaters, the overflow prevention valve of the second water heater is opened and water flows into the second water heater, and the burner of the second water heater is ignited. Is done.
As a result, large-capacity hot water can be supplied by the first and second water heaters.

【０００４】また、総流量が給湯器２台分の範囲内にあ
る水量の下限以下になる時には、２号給湯器の過流出防
止弁を閉じ、１号給湯器のみによる給湯に切替わる。When the total flow rate becomes equal to or lower than the lower limit of the amount of water within the range of two hot water heaters, the overflow prevention valve of the second hot water heater is closed, and the hot water supply is switched to the first hot water heater alone.

【０００５】しかしながら、このように流量（総流量）
によって給湯器の台数を切替える方式の並列型給湯装置
にあっては、総流量が２台の最低作動水量の和よりも若
干多く、しかも、入水温が設定温度に近い温度である
と、２台共に最小能力で燃焼しても出湯温度が設定温度
以上になってしまう場合がある（この場合、１台のみで
加熱していれば、設定温度以上にはならない）。また、
この方式では、運転台数の切替えが頻繁になり易く、台
数切替え時は出湯特性が悪化するため、使用勝手が悪い
という欠点があった。However, the flow rate (total flow rate)
In the case of a parallel type hot water supply system in which the number of hot water heaters is switched according to the total water flow, the total flow rate is slightly larger than the sum of the minimum operating water amounts of the two water heaters, and if the incoming water temperature is close to the set temperature, the two Even when both are burned with the minimum capacity, the tap water temperature may become higher than the set temperature (in this case, if only one unit is heated, the temperature does not become higher than the set temperature). Also,
In this method, switching of the number of operating units tends to be frequent, and when the number of units is switched, the tapping characteristics deteriorate, so that there is a disadvantage that the usability is poor.

【０００６】そのため、入水量に対して設定温度まで加
熱するのに必要な燃焼量に応じて給湯器の台数を切替え
るようにした並列型給湯装置も提案されている。このよ
うに燃焼量に応じて台数切替え制御するようにした並列
型給湯装置５１の概略図を図３に示す。この給湯装置５
１においては、入水管５２と出湯管５３の間に２本の分
岐管５４ａ、５４ｂを並列に挿入し、各分岐管５４ａ、
５４ｂに給湯器５５ａ、５５ｂを設けてある。また、入
水管５２には入水温度Ｔｃを検出するための入水温度セ
ンサ５６を設け、各分岐管５４ａ、５４ｂの給湯器入口
側に各分岐管５４ａ、５４ｂの流量ＱＫ１，ＱＫ２を検
出するための流量センサ５７ａ、５７ｂを設けると共に
給湯器出口側に過流出防止弁を５８ａ、５８ｂ設けてい
る。[0006] Therefore, there has been proposed a parallel-type hot water supply apparatus in which the number of hot water heaters is switched in accordance with the amount of combustion required to heat the incoming water amount to a set temperature. FIG. 3 is a schematic diagram of the parallel hot water supply device 51 in which the number of units is controlled to be switched in accordance with the amount of combustion. This water heater 5
In FIG. 1, two branch pipes 54a and 54b are inserted in parallel between the water inlet pipe 52 and the tapping pipe 53, and each branch pipe 54a,
Water heaters 55a and 55b are provided at 54b. Further, the water inlet pipe 52 is provided with a water inlet temperature sensor 56 for detecting the water inlet temperature Tc, and for detecting the flow rates QK1 and QK2 of the branch pipes 54a and 54b on the water heater inlet side of the branch pipes 54a and 54b. Flow rate sensors 57a and 57b are provided, and overflow prevention valves 58a and 58b are provided on the outlet side of the water heater.

【０００７】しかして、待機状態においては、１号給湯
器５５ａの過流出防止弁５８ａを開成し、２号給湯器５
５ｂの過流出防止弁５８ｂを閉成してあり、出湯管５３
の管端に設けられたカラン５９を開くと、１号給湯器５
５ａ側の分岐管５４ａに水が流れ、流量センサ５７ａで
検知している流量ＱＫ１が１号給湯器５５ａの最低作動
水量ＭＯＱ以上になると、１号給湯器５５ａのバーナを
点火する。そして、例えば、入水温度Ｔｃ及び１号給湯
器５５ａの通過流量ＱＫ１から１号給湯器５５ａをフィ
ードフォワード制御（以下、ＦＦ制御という）して１号
給湯器５５ａから設定温度Ｔｓの湯を出湯する。In the standby state, however, the overflow prevention valve 58a of the first water heater 55a is opened, and the second water heater 5a is opened.
5b is closed, and the tapping pipe 53 is closed.
When the curran 59 provided at the end of the pipe is opened, the first water heater 5
When water flows into the branch pipe 54a on the 5a side and the flow rate QK1 detected by the flow rate sensor 57a becomes equal to or more than the minimum working water amount MOQ of the first water heater 55a, the burner of the first water heater 55a is ignited. Then, for example, feed water temperature control (hereinafter referred to as FF control) is performed on the first water heater 55a from the incoming water temperature Tc and the flow rate QK1 of the first water heater 55a, and hot water at the set temperature Ts is discharged from the first water heater 55a. .

【０００８】さらに、１号給湯器５５ａの燃焼量がその
最大燃焼量Ｇmaxを超えると、２号給湯器５５ｂ側の過
流出防止弁５８ｂを開き、２号給湯器５５ｂにも水を流
すと共に２号給湯器５５ｂのバーナを点火し、１号給湯
器及び２号給湯器をそれぞれＦＦ制御することによって
設定温度Ｔｓの湯を給湯し、大量出湯に対処している。Further, when the combustion amount of the first water heater 55a exceeds the maximum combustion amount Gmax, the excessive outflow prevention valve 58b on the second water heater 55b side is opened, and water is also supplied to the second water heater 55b. Hot water of the set temperature Ts is supplied by igniting the burner of the hot water heater 55b and performing FF control of the first hot water heater and the second hot water heater, respectively, to cope with a large amount of hot water.

【０００９】また、１号給湯器５５ａの燃焼量が最大燃
焼量Ｇmaxの７０％以下になると、２号給湯器５５ｂ側
の過流出防止弁５８ｂを閉成し、１号給湯器５５ａ単独
で給湯する。When the combustion amount of the first water heater 55a becomes 70% or less of the maximum combustion amount Gmax, the overflow prevention valve 58b on the second water heater 55b side is closed, and the first water heater 55a alone supplies hot water. I do.

【００１０】一方、各分岐管５４ａ、５４ｂに設けられ
ている過流出防止弁５８ａ、５８ｂは、給湯器５５ａ，
５５ｂの最大燃焼量をＧmax、設定温度をＴｓとしたと
き、各分岐管５４ａ、５４ｂに流れる流量ＱＫ１，ＱＫ
２が Ｑmax＝Ｇmax／（Ｔｓ−Ｔｃ） … を超過しないように流量制御し、過流出（流量が過大で
あると、給湯器が最大燃焼量に達しても出湯温度が設定
温度よりも低下する現象）を防止している。しかし、Ｑ
maxによる制限のみであると、入水温度Ｔｃが設定温度
Ｔｓに近い場合にＱmaxの計算値が極めて大きくなるた
め大流量の水を流すことが可能になる。このため、大流
量の水が分岐管５４ａ、５４ｂに流れると、流速の極め
て大きな水が分岐管５４ａ、５４ｂを流れ、分岐管５４
ａ、５４ｂが浸食（エロージョン）される恐れがあるの
で、各分岐管５４ａ、５４ｂの流量ＱＫ１，ＱＫ２に上
限流量Ｑlimを定めている。On the other hand, overflow prevention valves 58a, 58b provided in each of the branch pipes 54a, 54b are provided with hot water heaters 55a,
Assuming that the maximum combustion amount of Gb 55b is Gmax and the set temperature is Ts, the flow rates QK1, QK flowing through the respective branch pipes 54a, 54b.
2 is controlled so as not to exceed Qmax = Gmax / (Ts-Tc)... Overflow (If the flow rate is excessive, the tapping temperature falls below the set temperature even if the water heater reaches the maximum combustion amount. Phenomenon). But Q
If only the limit by max is set, the calculated value of Qmax becomes extremely large when the incoming water temperature Tc is close to the set temperature Ts, so that a large flow rate of water can be made to flow. For this reason, when a large amount of water flows through the branch pipes 54a and 54b, water with a very high flow velocity flows through the branch pipes 54a and 54b, and
Since there is a possibility that a and 54b may be eroded, the upper limit flow rate Qlim is set for the flow rates QK1 and QK2 of the branch pipes 54a and 54b.

【００１１】この結果、入水温度Ｔｃが設定温度Ｔｓに
近くてＱmax＞Ｑlimとなっている場合には、エロージョ
ン防止のため過流出防止弁５８ａが絞られ、分岐管５４
ａの流量ＱＫ１は上限流量Ｑlimによって制限され、大
量出湯した場合には分岐管５４ａの流量ＱＫ１＝Ｑlim
となる。この場合には、入水温度Ｔｃが設定温度Ｔｓに
近く、流量ＱＫ１が上限流量Ｑlimに制限されているた
め、１号給湯器５５ａの燃焼量が最大燃焼量Ｇmaxにな
らず、２号給湯器５５ｂが稼働しない。このため、入水
温度Ｔｃが設定温度Ｔｓに近い場合には、大量出湯を要
求しても１台分の上限流量Ｑlimでしか出湯できないと
いう欠点があった。As a result, when the inlet water temperature Tc is close to the set temperature Ts and Qmax> Qlim, the overflow prevention valve 58a is throttled to prevent erosion, and the branch pipe 54 is closed.
a is limited by the upper limit flow rate Qlim, and when a large amount of hot water is discharged, the flow rate QK1 of the branch pipe 54a = Qlim.
Becomes In this case, since the incoming water temperature Tc is close to the set temperature Ts, and the flow rate QK1 is limited to the upper limit flow rate Qlim, the combustion amount of the first water heater 55a does not reach the maximum combustion amount Gmax, and the second water heater 55b does not. Does not work. Therefore, when the incoming water temperature Tc is close to the set temperature Ts, there is a drawback that even if a large amount of hot water is requested, the hot water can only be discharged at the upper limit flow rate Qlim for one vehicle.

【００１２】また、入水温度Ｔｃが低温で２台の給湯器
５５ａ、５５ｂが大きな燃焼量で燃焼している場合に
は、流量ＱＫ１，ＱＫ２が減少すると、１号給湯器５５
ａ単独に切替わる前に流量ＱＫ１，ＱＫ２が最低作動水
量ＭＯＱ以下に低下して両給湯器５５ａ及び５５ｂが消
火することが考えられる。このため、給湯器の燃焼量の
みで台数切替えを行なっている並列型給湯装置５１で
は、給湯器減数の場合の判定燃焼量を大きくとってお
り、この結果、給湯器増数及び減数判定のヒステリシス
が小さくなってしまい、ハンチングを起こし易くなって
いた。When the two water heaters 55a and 55b are burning with a large amount of combustion when the incoming water temperature Tc is low and the flow rates QK1 and QK2 decrease, the first water heater 55
Before switching to a alone, it is conceivable that the flow rates QK1 and QK2 drop below the minimum operating water amount MOQ and both water heaters 55a and 55b extinguish. For this reason, in the parallel type hot water supply device 51 in which the number of units is switched only by the amount of combustion of the water heater, the determination combustion amount in the case of water heater reduction is large, and as a result, the hysteresis of water heater increase and reduction determination is determined. Had become smaller and hunting was more likely to occur.

【００１３】[0013]

【発明が解決しようとする課題】本発明は叙上の従来例
の欠点に鑑みてなされたものであり、その目的とすると
ころは、増数の場合には給湯器の流量がエロージョン防
止のための上限流量によって制限される前に増数できる
ようにし、入水温度が高い場合にも大量出湯に応じられ
るようにし、また、減数の場合には、給湯器の流量が最
低作動水量以下になる前に減数させてハンチングを防止
することにある。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned drawbacks of the prior art, and has as its object to reduce the flow rate of the water heater in order to prevent erosion when the number of water heaters is increased. Before being limited by the upper limit flow rate, so that a large amount of hot water can be used even when the incoming water temperature is high. To prevent hunting.

【００１４】[0014]

【課題を解決するための手段】本発明の並列型給湯装置
は、２以上の給湯器を並列にして配置し、水源から送ら
れてくる水を各給湯器に分岐して供給することにより、
それら各給湯器で沸かされた湯の合計を使用することが
できるようにした並列型給湯装置において、着火してい
る給湯器について、いずれかの給湯器の燃焼量と所定の
最大燃焼量との差が所定値以下になるか、あるいは、い
ずれかの給湯器の流量と所定の最大流量との差が所定値
以下になった場合に給湯器の着火台数を増加させ、着火
している給湯器について、いずれかの給湯器の燃焼量と
所定の最低燃焼量との差が所定値以下になるか、あるい
は、いずれかの給湯器の流量と所定の最低作動流量との
差が所定値以下になった場合に給湯器の着火台数を減少
させるコントローラを備えたことを特徴としている。The parallel type hot water supply apparatus of the present invention comprises two or more water heaters arranged in parallel, and water supplied from a water source is branched and supplied to each water heater.
In parallel hot water supply apparatus which can be used the sum of them was boiled in the water heater hot water, it has been ignited
Water heater, the combustion amount of one of the
The difference from the maximum combustion amount is less than the specified value, or
The difference between the flow rate of the water heater and the specified maximum flow rate is the specified value
Increase the number of water heaters ignited when
For the hot water heater that is being used,
The difference from the predetermined minimum combustion amount is less than or equal to a predetermined value, or
Between the flow rate of one of the water heaters and the predetermined minimum operating flow rate
Reduce the number of water heaters ignited when the difference falls below a specified value
The controller is provided with a controller for causing the controller to operate .

【００１５】[0015]

【作用】本発明にあっては、着火しているいずれかの給
湯器の燃焼量と所定の最大燃焼量との差が所定値以下に
なるか、あるいは、いずれかの給湯器の流量と所定の最
大流量との差が所定値以下になった場合に給湯器の着火
台数を増加させるようにしているので、設定温度に近い
水温の水が例えば２台の最低作動水量の和よりも少し多
い流量で流入してきた場合には１台の給湯器で加熱給湯
する。従って、総流量のみによって給湯器台数を切替え
る方式の従来例のように比較的水温の高い水が流入して
きた場合に、給湯器が最小能力で燃焼しても設定温度以
上の湯が出湯されるといった不都合がない。また、給湯
器台数の切替えが繁雑に行なわれることも解消される。According to the present invention, any of the ignited
The difference between the amount of water burned by the water heater and the predetermined maximum amount of combustion falls below a predetermined value.
Or the flow rate of one of the water heaters
Ignition of water heater when difference from large flow rate is less than specified value
Since the number is increased, when water having a water temperature close to the set temperature flows in at a flow rate slightly larger than, for example, the sum of the two minimum operating water volumes, heating water is supplied by one water heater. Therefore, when water having a relatively high water temperature flows in as in the conventional example in which the number of water heaters is switched only by the total flow rate, even if the water heater burns with the minimum capacity, hot water at or above the set temperature is discharged. There is no such inconvenience. In addition, troublesome switching of the number of water heaters is also eliminated.

【００１６】しかも、燃焼中の給湯器の流量が最大流量
に達する前に増数させるようにしており、また、燃焼量
が最大燃焼量に達する前に増数させるようにしているの
で、燃焼量を最大燃焼量のみと比較して台数切替えを行
なっている従来例のように、流量が過流出防止弁によっ
て抑えられる結果、燃焼量が最大燃焼量に達せず、給湯
器台数の増数が行なわれず、入水温度が設定温度に近い
場合には、大量出湯を要求しても例えば１台分の上限流
量でしか出湯できなかった欠点が解消され、このような
場合にも速やかに増数して２台の給湯器によって大量出
湯できるようになる。In addition, since the flow rate of the hot water heater during combustion is increased before reaching the maximum flow rate, and the combustion quantity is increased before reaching the maximum combustion quantity, the combustion quantity is increased. As in the conventional example in which the number is switched by comparing only with the maximum combustion amount, as a result of the flow rate being suppressed by the overflow prevention valve, the combustion amount does not reach the maximum combustion amount, and the number of water heaters is increased. However, when the incoming water temperature is close to the set temperature, even if a large amount of hot water is requested, the drawback that the hot water could only be discharged at the upper limit flow rate of one unit, for example, is eliminated. A large amount of hot water can be supplied by two water heaters.

【００１７】また、着火しているいずれかの給湯器の燃
焼量と所定の最低燃焼量との差が所定値以下になるか、
あるいは、いずれかの給湯器の流量と所定の最低作動流
量との差が所定値以下になった場合に、給湯器の着火台
数を減少させるようにしているので、給湯器の通過流量
が最低作動水量以下に低下して給湯器が消火する以前に
給湯器を減数させることができるため、給湯器の増加、
減少の判定のヒステリシスを大きくでき、給湯器がハン
チングを起こしにくくなる。Also, the fuel of any of the ignited water heaters
Whether the difference between the burning amount and the predetermined minimum combustion amount is equal to or less than a predetermined value,
Alternatively, the flow rate of one of the water heaters and the predetermined minimum operating flow
When the difference from the amount becomes less than the specified value, the water heater
The number of water heaters can be reduced before the water heaters extinguish due to a decrease in the flow rate of the water heaters below the minimum operating water volume because the number of water heaters is reduced.
The hysteresis for determining the decrease can be increased, and the water heater is less likely to cause hunting.

【００１８】[0018]

【実施例】図１は本発明の一実施例による並列型給湯装
置を示す概略構成図である。この並列型給湯装置１にあ
っては、管端を市水等に接続された入水管２と管端にカ
ラン４を設けられた出湯管３との間に２本の分岐管５
ａ、５ｂが並列に接続されており、各分岐管５ａ、５ｂ
には給湯器（１号給湯器及び２号給湯器）６ａ、６ｂが
設けられている。すなわち、各分岐管５ａ，５ｂの途中
に熱交換器７ａ、７ｂが設けられており、バーナ８ａ，
８ｂによって熱交換器７ａ，７ｂを加熱するようになっ
ており、バーナ８ａ、８ｂの燃焼量は比例制御弁９ａ，
９ｂによって制御される。また、各分岐管５ａ，５ｂに
は給湯器６ａ，６ｂをバイパスするようにして給湯器入
口側と給湯器出口側との間にバイパス管１０ａ，１０ｂ
が配管されている。入水管２には入水温度Ｔｃを検出す
るための入水温度センサ１１が設けられている。バイパ
ス管１０ａ、１０ｂにはバイパス開閉弁１２ａ、１２ｂ
及びバイパス側流量ＱＢ１，ＱＢ２を検出するためのバ
イパス流量センサ１３ａ、１３ｂが設けられている。分
岐管５ａ、５ｂのバイパス管１０ａ、１０ｂとの分岐点
及び給湯器入口側の間には給湯器側流量ＱＫ１，ＱＫ２
を検出するための給湯器側流量センサ１４ａ、１４ｂが
設けられており、分岐管５ａ、５ｂの給湯器出口側及び
バイパス管１０ａ、１０ｂとの合流点の間には過流出防
止弁１５ａ、１５ｂと給湯器６ａ，６ｂからの出湯温度
Ｔｈ１，Ｔｈ２を検出するための出湯温度センサ１６
ａ，１６ｂが設けられている。また、分岐管５ａ、５ｂ
のバイパス管１０ａ、１０ｂとの合流点よりも下流側に
は分岐管開閉弁１７ａ、１７ｂと各分岐管５ａ、５ｂに
おけるミキシング温度ＴＭ１，ＴＭ２を検出するための
ミキシング温度センサ１８ａ、１８ｂが設けられてお
り、待機状態においては、１号給湯器６ａ側の分岐管開
閉弁１７ａは開かれており、２号給湯器６ｂ側の分岐管
開閉弁１７ｂは閉じられている。また、カラン４からの
希望出湯温度（設定温度Ｔｓ）は、湯温設定器１９によ
って入力される。FIG. 1 is a schematic diagram showing a parallel type hot water supply apparatus according to one embodiment of the present invention. In this parallel type hot water supply apparatus 1, two branch pipes 5 are provided between a water inlet pipe 2 having a pipe end connected to city water or the like and a hot water pipe 3 provided with a curan 4 at the pipe end.
a, 5b are connected in parallel, and each branch pipe 5a, 5b
Are provided with water heaters (first and second water heaters) 6a and 6b. That is, the heat exchangers 7a and 7b are provided in the middle of the branch pipes 5a and 5b, and the burners 8a and 7b are provided.
8b heats the heat exchangers 7a and 7b, and the combustion amount of the burners 8a and 8b is controlled by the proportional control valves 9a and 9b.
9b. Each of the branch pipes 5a and 5b bypasses the water heaters 6a and 6b so that bypass pipes 10a and 10b are provided between the water heater inlet side and the water heater outlet side.
Is plumbed. The water inlet pipe 2 is provided with a water inlet temperature sensor 11 for detecting the water inlet temperature Tc. The bypass pipes 10a and 10b have bypass on-off valves 12a and 12b, respectively.
Further, bypass flow rate sensors 13a and 13b for detecting the bypass side flow rates QB1 and QB2 are provided. Between the branch points of the branch pipes 5a, 5b with the bypass pipes 10a, 10b and the water heater inlet side, water heater side flow rates QK1, QK2 are provided.
Water heater-side flow sensors 14a and 14b for detecting the flow of water are provided. And hot water temperature sensors 16 for detecting hot water temperatures Th1 and Th2 from water heaters 6a and 6b, respectively.
a and 16b are provided. Also, the branch pipes 5a, 5b
The branch pipe opening / closing valves 17a, 17b and the mixing temperature sensors 18a, 18b for detecting the mixing temperatures TM1, TM2 in the respective branch pipes 5a, 5b are provided downstream of the junction with the bypass pipes 10a, 10b. In the standby state, the branch pipe opening / closing valve 17a on the first water heater 6a side is opened, and the branch pipe opening / closing valve 17b on the second water heater 6b side is closed. Also, the desired hot water temperature (set temperature Ts) from curran 4 is input by hot water temperature setting device 19.

【００１９】上記並列型給湯装置１においては、マイク
ロコンピュータを内蔵したコントローラ２０によって給
湯温度制御や給湯器６ａ，６ｂの使用台数の切替え制御
が行なわれている。そのため、各種センサ１１、１３
ａ，１３ｂ、１４ａ，１４ｂ、１６ａ，１６ｂ、１８
ａ，１８ｂの検出値や湯温設定器１９で設定された設定
温度Ｔｓがコントローラ２０に入力されており、コント
ローラ２０は予め設定されている処理手順に従って比例
制御弁９ａ，９ｂやバイパス開閉弁１２ａ，１２ｂ、過
流出防止弁１５ａ，１５ｂ、分岐管開閉弁１７ａ，１７
ｂ等を制御し、給湯温度制御や給湯器６ａ，６ｂの台数
切替え制御を行なっている。In the above-mentioned parallel type hot water supply apparatus 1, hot water temperature control and switching control of the number of hot water heaters 6a and 6b are performed by a controller 20 incorporating a microcomputer. Therefore, various sensors 11 and 13
a, 13b, 14a, 14b, 16a, 16b, 18
The detected values of a and 18b and the set temperature Ts set by the hot water temperature setting device 19 are input to the controller 20, and the controller 20 operates the proportional control valves 9a and 9b and the bypass opening / closing valve 12a according to a preset processing procedure. , 12b, overflow prevention valves 15a, 15b, branch pipe opening / closing valves 17a, 17
b, etc., to control the hot water temperature and to control the number of hot water heaters 6a and 6b.

【００２０】各分岐管５ａ，５ｂにおいては、互いに独
立して給湯温度制御が行なわれており、しかも、設定温
度Ｔｓによって異なった給湯温度制御が行なわれてい
る。すなわち、湯温設定器１９より入力されている設定
温度Ｔｓが一定値Ｔｏ（例えば、５０℃）以上の場合に
は、バイパス開閉弁１２ａ，１２ｂを閉じて給湯器６
ａ，６ｂ側からのみ出湯される。また、設定温度Ｔｓ＜
Ｔｏの場合には、バイパス開閉弁１２ａ，１２ｂを開
き、給湯器６ａ，６ｂから出湯された高温の湯とバイパ
ス管１０ａ，１０ｂを通過した水を混合して設定温度Ｔ
ｓの湯を出湯している。In each of the branch pipes 5a and 5b, hot water temperature control is performed independently of each other, and different hot water temperature controls are performed depending on the set temperature Ts. That is, when the set temperature Ts input from the hot water temperature setting device 19 is equal to or higher than the fixed value To (for example, 50 ° C.), the bypass on-off valves 12a and 12b are closed and the water heater 6 is turned off.
Hot water is supplied only from a and 6b sides. Also, the set temperature Ts <
In the case of To, the bypass opening / closing valves 12a and 12b are opened, and the hot water discharged from the water heaters 6a and 6b is mixed with the water passed through the bypass pipes 10a and 10b to set the temperature T.
The hot water of s is running out.

【００２１】（Ｔｓ＜Ｔｏの場合の湯温制御）コントロ
ーラ２０は、バイパス側流量ＱＢ１，ＱＢ２と給湯器側
流量ＱＫ１，ＱＫ２の比 ＱＢ１／ＱＫ１ ＱＢ２／ＱＫ２ の各固定値として予め与えられている値（標準分配比）
ｋと設定温度Ｔｓ及び入水温度Ｔｃに基づき、給湯器６
ａ，６ｂから出湯すべき湯温（以下、これを疑似設定温
度という） Ｔｇｓ＝（１＋ｋ）Ｔｓ−ｋＴｃ を演算する。そして、入水温度センサ１１によって検出
している入水温度Ｔｃ及び給湯器側流量センサ１４ａ，
１４ｂによって検出している給湯器側流量ＱＫ１，ＱＫ
２に基づき給湯器６ａ，６ｂから疑似設定温度Ｔｇｓの
湯を出湯するよう比例制御弁９ａ，９ｂをフィードフォ
ワード制御（以下、ＦＦ制御という）する。こうして、
給湯器６ａ，６ｂから出湯された疑似設定温度Ｔｇｓの
湯とバイパス管１０ａ，１０ｂを通過した水温Ｔｃの湯
が混合されると設定温度Ｔｓの湯がカラン４から出湯さ
れる。なお、ミキシング温度センサ１８ａ，１８ｂによ
って検出しているミキシング温度ＴＭ１，ＴＭ２と設定
温度Ｔｓとの偏差（ＴＭ１−Ｔｓ）または（ＴＭ２−Ｔ
ｓ）に基づき、ＦＦ制御に加えて比例制御弁９ａ，９ｂ
をフィードバック制御することもある。(Hot water temperature control when Ts <To) The controller 20 is provided in advance as fixed values of the ratios QB1 / QK1 QB2 / QK2 of the bypass-side flow rates QB1, QB2 and the water heater-side flow rates QK1, QK2. Value (standard distribution ratio)
k, the set temperature Ts, and the incoming water temperature Tc,
The hot water temperature to be discharged from a and 6b (hereinafter referred to as a pseudo set temperature) Tgs = (1 + k) Ts-kTc is calculated. Then, the incoming water temperature Tc detected by the incoming water temperature sensor 11 and the water heater side flow sensor 14a,
Water heater-side flow rates QK1, QK detected by 14b
2, the proportional control valves 9a and 9b are feed-forward controlled (hereinafter referred to as FF control) so that hot water at the pseudo set temperature Tgs is supplied from the water heaters 6a and 6b. Thus,
When hot water of the pseudo set temperature Tgs discharged from the water heaters 6a and 6b and hot water of the water temperature Tc passed through the bypass pipes 10a and 10b are mixed, hot water of the set temperature Ts is discharged from the curran 4. The deviation (TM1-Ts) between the mixing temperatures TM1 and TM2 detected by the mixing temperature sensors 18a and 18b and the set temperature Ts or (TM2-Ts).
s), the proportional control valves 9a, 9b in addition to the FF control
May be feedback controlled.

【００２２】なお、バイパス管１０ａ、１０ｂにはバイ
パス開閉弁１２ａ，１２ｂに代えてそれぞれバイパス流
量制御弁を設けてもよい。その場合には、熱交換器７
ａ，７ｂからの出湯温度Ｔｈ１，Ｔｈ２が疑似設定温度
Ｔｇｓと等しくなるように比例制御弁９ａ，９ｂをＦＦ
制御した後、さらに、ミキシング温度センサ１８ａ，１
８ｂによって検出しているミキシング温度ＴＭ１，ＴＭ
２がそれぞれ設定温度Ｔｓと等しくなるようバイパス流
量制御弁によってバイパス流量ＱＢ１，ＱＢ２をフィー
ドバック制御することができる。The bypass pipes 10a and 10b may be provided with bypass flow rate control valves instead of the bypass on-off valves 12a and 12b. In that case, the heat exchanger 7
The proportional control valves 9a and 9b are set to FF so that the hot water temperatures Th1 and Th2 from the a and 7b become equal to the pseudo set temperature Tgs.
After the control, the mixing temperature sensors 18a, 18
8b detected at the mixing temperatures TM1 and TM
The bypass flow rates QB1 and QB2 can be feedback-controlled by the bypass flow rate control valve so that each of the pressures 2 becomes equal to the set temperature Ts.

【００２３】（Ｔｓ≧Ｔｏの場合の湯温制御）この場合
には、疑似設定温度Ｔｇｓの代わりに設定温度Ｔｓの値
を用いて比例制御弁９ａ，９ｂがＦＦ制御される。従っ
て、給湯器６ａ，６ｂから設定温度Ｔｓの湯が出湯され
る。(Hot water temperature control when Ts ≧ To) In this case, the proportional control valves 9a and 9b are FF-controlled using the value of the set temperature Ts instead of the pseudo set temperature Tgs. Therefore, hot water of the set temperature Ts is discharged from the water heaters 6a and 6b.

【００２４】（最低作動水量ＭＯＱについて）バイパス
開閉弁１２ａ，１２ｂが開いている場合には、給湯器側
流量ＱＫ１，ＱＫ２についての最低作動水量ＭＯＱ
K（例えば、１.８リットル／分）のほかに、総流量ＱＫ１＋
ＱＢ１，ＱＫ２＋ＱＢ２についても最低作動水量ＭＯＱ
T（例えば、３.２リットル／分）を定めている。この総流量
ＱＢ１＋ＱＫ１，ＱＫ２＋ＱＢ２についてのＭＯＱ
Tは、バイパス開閉弁１２ａ，１２ｂの動きによって給
湯器６ａ，６ｂが点火、消火を繰り返してハンチングを
起こすことを防止するためであり、バイパス開閉弁１２
ａ，１２ｂが全開でも給湯器側流量ＱＫ１，ＱＫ２がＭ
ＯＱK以下にならないよう定めてある。しかして、給湯
器６ａ，６ｂは、総流量ＱＫ１＋ＱＢ１、ＱＫ２＋ＱＢ
２がＭＯＱT以上となり、かつ、給湯器側流量ＱＫ１，
ＱＫ２がＭＯＱK以上となった時に給湯器６ａ，６ｂを
点火する。なお、バイパス開閉弁１２ａ，１２ｂが閉じ
ている場合には、給湯器側流量ＱＫ１，ＱＫ２と総流量
ＱＢ１＋ＱＫ１，ＱＫ２＋ＱＢ２とはそれぞれ等しいか
ら給湯器６ａ，６ｂ側のＭＯＱのみを監視する。(About the minimum operating water amount MOQ) When the bypass on-off valves 12a and 12b are open, the minimum operating water amount MOQ for the water heater side flow rates QK1 and QK2 is set.
K (for example, 1.8 liter / min), total flow QK1 +
Minimum working water volume MOQ for QB1, QK2 + QB2
T (eg, 3.2 liters / minute). MOQ for the total flow rate QB1 + QK1, QK2 + QB2
T is for preventing the water heaters 6a, 6b from repeatedly igniting and extinguishing to cause hunting due to the movement of the bypass on-off valves 12a, 12b.
Even when a and 12b are fully open, water heater side flow rates QK1 and QK2 are M
OQ K are determined so as not to below. Thus, the water heaters 6a, 6b have the total flow rates QK1 + QB1, QK2 + QB
2 is greater than MOQ T , and the water heater side flow rate QK1,
QK2 ignites water heater 6a, and 6b when it becomes equal to or greater than MOQ K. When the bypass on-off valves 12a and 12b are closed, the water heater-side flow rates QK1 and QK2 are equal to the total flow rates QB1 + QK1 and QK2 + QB2, respectively, so that only the MOQs on the water heaters 6a and 6b are monitored.

【００２５】（最大流量について）バイパス開閉弁１２
ａ，１２ｂが開いている場合の最大流量には、総流量Ｑ
Ｋ１＋ＱＢ１，ＱＫ２＋ＱＫ２についての最大流量ＱＭ
Ｔと給湯器側流量ＱＫ１，ＱＫ２についての最大流量Ｑ
ＭＫとがある。総流量ＱＢ１＋ＱＫ１，ＱＫ２＋ＱＢ２
についての最大流量ＱＭＴは、過流出防止のために定め
られている上限流量ＱmaxTとエロージョン防止のための
上限流量ＱlimTとのうちいずれか小さな方で決まる。す
なわち、 ＱＭＴ＝mini（ＱmaxT，ＱlimT） となる。ここで、過流出防止のための上限流量Ｑmax
Tは、給湯器６ａ，６ｂの最大燃焼量をＧmaxとすると、 ＱmaxT＝Ｇmax／（Ｔｓ−Ｔｃ） となるように決められており、エロージョン防止のため
の上限流量ＱlimTは予め決められた一定値である。(Maximum flow rate) Bypass valve 12
The maximum flow rate when a and 12b are open includes the total flow rate Q
Maximum flow rate QM for K1 + QB1, QK2 + QK2
Maximum flow rate Q for T and water heater side flow rate QK1, QK2
There is MK. Total flow QB1 + QK1, QK2 + QB2
Is determined by the smaller one of the upper limit flow rate Qmax T defined for preventing overflow and the upper limit flow rate Qlim T for preventing erosion. That is, QMT = mini (Qmax T , Qlim T ). Here, the upper limit flow rate Qmax for preventing over-spill
T, when water heater 6a, the maximum combustion amount of 6b and Gmax, Qmax T = Gmax / ( Ts-Tc) and are determined in such that the upper limit flow rate QLIM T for preventing erosion predetermined It is a constant value.

【００２６】また、給湯器側流量ＱＫ１，ＱＫ２につい
ての最大流量ＱＭＫは、過流出防止のために定められて
いる上限流量ＱmaxKで決まる。すなわち、 ＱＭＫ＝ＱmaxK となる。ここで、過流出防止のための上限流量Ｑmax
Kは、疑似設定温度Ｔｇｓを用いて、 ＱmaxK＝Ｇmax／（Ｔｇｓ−Ｔｃ） となるように決められている。なお、給湯器側流量ＱＫ
１，ＱＫ２についての最大流量ＱＭＫについてもエロー
ジョン防止のための上限流量ＱlimKを考慮し、ＱmaxKと
ＱlimKのうちいずれか小さな方と等しくなるように定め
ても差し支えない。しかして、各分岐管５ａ，５ｂの過
流出防止弁１５ａ，１５ｂは、総流量ＱＫ１＋ＱＢ１，
ＱＫ２＋ＱＢ２が最大流量ＱＭＴを超えず、給湯器側流
量ＱＫ１，ＱＫ２が最大流量ＱＭＫを超えないよう流量
制限する。Further, the maximum flow rate QMK for water heater side flow QK1, Qk2 is determined by the upper limit flow rate Qmax K which is defined for the excessive outflow prevention. In other words, the QMK = Qmax K. Here, the upper limit flow rate Qmax for preventing over-spill
K is determined using the pseudo set temperature Tgs so that Qmax K = Gmax / (Tgs-Tc). The water heater side flow rate QK
The maximum flow rate QMK for 1 and QK2 may be set to be equal to the smaller one of Qmax K and Qlim K in consideration of the upper limit flow rate Qlim K for preventing erosion. Thus, the overflow prevention valves 15a, 15b of the respective branch pipes 5a, 5b are provided with the total flow rate QK1 + QB1,
The flow rate is limited so that QK2 + QB2 does not exceed the maximum flow rate QMT and the water heater side flow rates QK1 and QK2 do not exceed the maximum flow rate QMK.

【００２７】また、バイパス開閉弁１２ａ，１２ｂが閉
じている場合には、疑似設定温度Ｔｇｓと設定温度Ｔｓ
とが一致するため、ＱmaxT＝ＱmaxK、したがってＱＭＴ
≦ＱＭＫとなるので、過流出防止弁１５ａ，１５ｂは総
流量ＱＫ１＋ＱＢ１，ＱＫ２＋ＱＢ２が最大流量ＱＭＴ
を超えないよう流量制限する。When the bypass valves 12a and 12b are closed, the pseudo set temperature Tgs and the set temperature Ts
Qmax T = Qmax K and therefore QMT
≦ QMK, the overflow prevention valves 15a and 15b have the total flow rate QK1 + QB1, QK2 + QB2 as the maximum flow rate QMT.
Limit the flow rate so as not to exceed.

【００２８】（使用する給湯器台数を増加させる場合の
処理）つぎに、コントローラ２０による給湯器６ａ，６
ｂの台数切替え処理を増数の場合と減数の場合に分けて
説明する。まず、１号給湯器６ａが燃焼している状態か
ら、１号給湯器６ａ及び２号給湯器６ｂが燃焼する状態
へ増数する場合の条件及び処理について説明する。給湯
器を増数して２号給湯器６ｂを点火させるための条件
は、１号給湯器６ａについて、 条件Ａ１： ＱＭＴ×α≦（ＱＫ１＋ＱＢ１） 条件Ａ２： ＱＭＫ×α≦ＱＫ１ かつ、｜Ｔｇｓ−Ｔｈ１｜≦δ かつ、｜Ｔｓ−ＴＭ１｜≦δ 条件Ａ３： （Ｇmax×α）／（ＴＭ１−Ｔｃ）≦（Ｑ
Ｋ１＋ＱＢ１） の３つの条件のうち、少なくともいずれか１つの条件を
満たすことである。ここで、αは１よりも小さく、か
つ、１に近い定数であって、例えばα＝０.９とするこ
とができる。δは小さな温度であって、例えばδ＝２℃
とすることができる。上記条件Ａ１は、総流量ＱＫ１＋
ＱＢ１が最大流量ＱＭＴに近づいたときに増数すること
を意味し、条件Ａ２の第１式は給湯器側流量ＱＫ１が最
大流量ＱＭＫに近づいたときに増数することを意味し、
条件Ａ３は１号給湯器６ａの燃焼量（ＴＭ１−Ｔｃ）
（ＱＫ１＋ＱＢ１）が最大燃焼量Ｇmaxに近づいたとき
に増数することを意味している。なお、条件Ａ２の第２
式及び第３式は、湯温制御による過渡期状態を除外する
ものである。図２（ａ）は給湯器を増数して２号給湯器
６ｂを点火させるか、否かの判断処理を示すフローチャ
ートであって、Ｓ３１は条件Ａ１に、Ｓ３２〜Ｓ３４は
条件Ａ２に、Ｓ３５は条件Ａ３に相当し、条件Ａ１〜Ａ
３のうちいずれかの条件を満たす場合には分岐管開閉弁
１７ｂを開いて（Ｓ３６）２号給湯器６ｂを点火し、２
号給湯器６ｂ側からも出湯する。(Process for Increasing the Number of Water Heaters Used) Next, the water heaters 6a and 6
The process of switching the number of units b will be described separately for the case of increasing the number and the case of decreasing the number. First, conditions and processing in a case where the number is increased from a state where the first water heater 6a is burning to a state where the first water heater 6a and the second water heater 6b are burning will be described. Conditions for increasing the number of water heaters and igniting No. 2 water heater 6b are as follows for No. 1 water heater 6a: Condition A1: QMT × α ≦ (QK1 + QB1) Condition A2: QMK × α ≦ QK1 and | Tgs− Th1 | ≦ δ and | Ts−TM1 | ≦ δ Condition A3: (Gmax × α) / (TM1-Tc) ≦ (Q
K1 + QB1) that at least one of the three conditions is satisfied. Here, α is a constant smaller than 1 and close to 1, for example, α = 0.9. δ is a small temperature, for example, δ = 2 ° C.
It can be. The condition A1 is the total flow rate QK1 +
QB1 means increasing when approaching the maximum flow rate QMT, and the first expression of the condition A2 means increasing when the water heater side flow rate QK1 approaches the maximum flow rate QMK,
Condition A3 is the combustion amount of the first water heater 6a (TM1-Tc)
This means that the number increases when (QK1 + QB1) approaches the maximum combustion amount Gmax. Note that the second of the conditions A2
The equations and the third equation exclude the transitional state due to the hot water temperature control. FIG. 2A is a flowchart showing a process of determining whether or not to increase the number of water heaters and ignite the second water heater 6b. S31 is in the condition A1, S32 to S34 are in the condition A2, and S35. Corresponds to the condition A3, and the conditions A1 to A
If any one of the conditions 3 is satisfied, the branch pipe opening / closing valve 17b is opened (S36), and the No. 2 water heater 6b is ignited.
Hot water is also supplied from the hot water heater 6b.

【００２９】しかして、上記のような条件によれば、条
件Ａ３において給湯器６ａの燃焼量を最大燃焼量Ｇmax
と比較して給湯器台数を切替えるようにしているので、
設定温度Ｔｓに近い水温の水が２台の最低作動水量の和
よりも少し多い流量で流入してきた場合には１台の給湯
器６ａで加熱給湯することになる。従って、総流量のみ
によって給湯器台数を切替える方式の従来例のように比
較的水温の高い水が流入してきた場合に、給湯器が最小
能力で燃焼しても設定温度以上の湯が出湯されるといっ
た不都合がない。また、給湯器台数の切替えが繁雑に行
なわれることもない。しかも、条件Ａ１及びＡ３によ
り、１号給湯器６ａの流量が最大流量ＱＭＴ，ＱＭＫに
達する前に増数させるようにしており、また、条件Ａ２
でも１号給湯器６ａの燃焼量が最大燃焼量Ｇmaxに達す
る前に増数させるようにしているので、燃焼量を最大燃
焼量のみと比較して台数切替えを行なっている従来例の
ように、流量が過流出防止弁によって抑えられる結果、
燃焼量が最大燃焼量に達せず、給湯器台数の増数が行な
われず、入水温度が設定温度に近い場合には、大量出湯
を要求しても１台分の上限流量Ｑlimでしか出湯できな
かった欠点が解消され、このような場合にも速やかに増
数して２台の給湯器６ａ、６ｂによって大量出湯できる
ようになる。According to the above conditions, the combustion amount of the water heater 6a is reduced to the maximum combustion amount Gmax under the condition A3.
Since the number of water heaters is switched compared to
When water having a water temperature close to the set temperature Ts flows in at a flow rate slightly larger than the sum of the two minimum operating water volumes, the hot water is supplied by one water heater 6a. Therefore, when water having a relatively high water temperature flows in as in the conventional example in which the number of water heaters is switched only by the total flow rate, even if the water heater burns with the minimum capacity, hot water at or above the set temperature is discharged. There is no such inconvenience. In addition, switching of the number of hot water heaters is not complicated. In addition, according to the conditions A1 and A3, the flow rate of the first water heater 6a is increased before reaching the maximum flow rates QMT and QMK.
However, since the combustion amount of the first water heater 6a is increased before reaching the maximum combustion amount Gmax, the number of units is switched by comparing the combustion amount with only the maximum combustion amount, as in the conventional example. As a result of the flow rate being suppressed by the overflow prevention valve,
If the combustion amount does not reach the maximum combustion amount, the number of hot water heaters is not increased, and the incoming water temperature is close to the set temperature, even if a large amount of hot water is requested, only the upper limit flow rate Qlim for one unit can be supplied. In such a case, the number of hot water can be quickly increased and the large amount of hot water can be supplied by the two hot water heaters 6a and 6b.

【００３０】（使用する給湯器台数を減少させる場合の
処理）つぎに、１号給湯器６ａ及び２号給湯器６ｂが燃
焼している状態から、２号給湯器６ｂを消火して給湯器
台数を減数する場合の条件及び処理について説明する。
給湯器を減数して２号給湯器６ｂを休止させるための条
件は、２号給湯器６ｂについて、 条件Ｂ１： ＭＯＱK＋β≧ＱＫ２ 条件Ｂ２： Ｇmini／（ＴＭ２−Ｔｃ）＋β≧（ＱＫ２
＋ＱＢ２） 条件Ｂ３： ＭＯＱT＋β≧（ＱＫ２＋ＱＢ２） の３つの条件のうち、少なくともいずれか１つの条件を
満たすことである。ここで、Ｇminiは２号給湯器６ｂの
最小燃焼量、βは流量を表わす正の小さな定数である。
上記条件Ｂ１は、給湯器側流量ＱＫ２が最低作動水量Ｍ
ＯＱKに近づいたときに減数することを意味し、条件Ｂ
２は２号給湯器６ｂの燃焼量（ＴＭ２−Ｔｃ）（ＱＫ２
＋ＱＢ２）が最小燃焼量Ｇminiに近づいたときに減数す
ることを意味し、条件Ｂ３は総流量ＱＫ２＋ＱＢ２が最
低作動水量ＭＯＱTに近づいたときに減数することを意
味している。図２（ｂ）は給湯器を減数して２号給湯器
６ｂを休止させるか、否かの判断処理を示すフローチャ
ートであって、Ｓ４１は条件Ｂ１に、Ｓ４２は条件Ｂ２
に、Ｓ４３は条件Ｂ３に相当し、条件Ｂ１〜Ｂ３のうち
いずれかの条件を満たす場合には分岐管開閉弁１７ｂを
閉じて（Ｓ４４）２号給湯器６ｂを消火し、２号給湯器
６ｂからの給湯を停止する。(Process for reducing the number of hot water heaters to be used) Next, in a state where the first hot water heater 6a and the second hot water heater 6b are burning, the second hot water heater 6b is extinguished and the number of hot water heaters is reduced. The conditions and processing for reducing the number will be described.
The condition for reducing the number of water heaters and suspending the second water heater 6b is as follows for the second water heater 6b: Condition B1: MOQ K + β ≧ QK2 Condition B2: Gmini / (TM2-Tc) + β ≧ (QK2
+ QB2) Condition B3: At least one of the three conditions of MOQ T + β ≧ (QK2 + QB2) is satisfied. Here, Gmini is the minimum combustion amount of the second water heater 6b, and β is a small positive constant representing the flow rate.
The condition B1 is that the water heater side flow rate QK2 is equal to the minimum operating water amount M.
Condition B means decrement when approaching OQ K
2 is the combustion amount (TM2-Tc) (QK2
+ QB2) is meant to subtrahend when approaching the minimum combustion amount Gmini, condition B3 is meant to subtrahend when the total flow Qk2 + QB2 approaches the minimum operating water MOQ T. FIG. 2B is a flowchart showing a process for determining whether or not to reduce the number of water heaters and to suspend the second water heater 6b. S41 is a condition B1 and S42 is a condition B2.
Meanwhile, S43 corresponds to the condition B3, and when any one of the conditions B1 to B3 is satisfied, the branch pipe opening / closing valve 17b is closed (S44), the No. 2 water heater 6b is extinguished, and the No. 2 water heater 6b To stop hot water supply.

【００３１】しかして、上記のように流量が最低作動水
量ＭＯＱT，ＭＯＱKに接近したときに給湯器台数を減数
させるようにすれば、給湯器の通過流量が最低作動水量
以下に低下して給湯器が消火する以前に給湯器を減数さ
せることができるため、流量の低下によって給湯器が減
数する前に消火してしまうことがなくなる。この結果、
燃焼量についての判定基準も最低燃焼量Ｇminiのような
小さな値を用いることができ、給湯器の増加、減少の判
定のヒステリシス（Ｇmini，Ｇmax）が大きくなり、ハ
ンチングを起こしにくくなる。However, if the number of water heaters is reduced when the flow rate approaches the minimum working water flow rates MOQ T and MOQ K as described above, the flow rate passing through the water heater drops below the minimum working water flow rate. Since the number of water heaters can be reduced before the water heater extinguishes, it is not possible to extinguish the fire before the water heater decrements due to a decrease in flow rate. As a result,
As a criterion for determining the combustion amount, a small value such as the minimum combustion amount Gmini can be used, and the hysteresis (Gmini, Gmax) for determining the increase or decrease in the number of water heaters increases, and hunting hardly occurs.

【００３２】上記説明は、バイパス開閉弁１２ａ，１２
ｂが開かれている場合の台数切替え制御方法であるが、
バイパス開閉弁１２ａ，１２ｂが閉じられている場合に
は、図２（ａ）（ｂ）のステップＳ３２、Ｓ３４、Ｓ４
２はスキップさせて省略しても良い。また、バイパス開
閉弁に代えてバイパス流量制御弁を用いている場合に
は、図２（ａ）（ｂ）そのままの台数切替え制御方法の
みでよい。The above description is based on the bypass on-off valves 12a, 12
This is a control method for switching the number of units when b is open.
When the bypass on-off valves 12a and 12b are closed, steps S32, S34, and S4 in FIGS.
2 may be skipped and omitted. When a bypass flow control valve is used instead of the bypass opening / closing valve, only the unit number switching control method shown in FIGS. 2A and 2B may be used.

【００３３】なお、本発明は上記実施例以外にも種々設
計変更可能である。例えば、条件Ａ１及び条件Ａ２では
１号給湯器６ａの総流量ＱＫ１＋ＱＢ１と給湯器側流量
ＱＫ１とのそれぞれについて最大流量の近傍値αＱＭ
Ｔ、αＱＭＫと比較しているが、いずれか一方のみの条
件を用いてもよい。つまり、条件Ａ１か、条件Ａ２のい
ずれか一方だけを省略しても差し支えない。The present invention can be variously modified in addition to the above embodiment. For example, in the conditions A1 and A2, the vicinity value αQM of the maximum flow rate for each of the total flow rate QK1 + QB1 of the first water heater 6a and the water heater side flow rate QK1.
Although it is compared with T and αQMK, only one of the conditions may be used. That is, only one of the condition A1 and the condition A2 may be omitted.

【００３４】また、条件Ｂ１及び条件Ｂ３では２号給湯
器６ｂの給湯器側流量ＱＫ２と総流量ＱＫ２＋ＱＢ２と
のそれぞれについて最低作動水量の近傍値ＭＯＱK＋
β、ＭＯＱT＋βと比較しているが、いずれか一方のみ
の条件を用いてもよい。つまり、条件Ｂ１か、条件Ｂ３
２のいずれか一方だけを省略しても差し支えない。In the conditions B1 and B3, each of the water heater side flow rate QK2 of the No. 2 water heater 6b and the total flow rate QK2 + QB2 has a value close to the minimum operating water amount MOQ K +.
Although β and MOQ T + β are compared, conditions for only one of them may be used. That is, the condition B1 or the condition B3
Only one of the two may be omitted.

【００３５】また、減数の場合、２号給湯器６ｂのみに
ついて条件Ｂ１〜Ｂ３を適用したが、１号給湯器６ａに
ついて条件Ｂ１〜Ｂ３と同様な条件を適用して、あるい
は１号給湯器６ａ及び２号給湯器６ｂについて条件Ｂ１
〜Ｂ３のような条件を適用して、２号給湯器６ｂを休止
させるか否かの判断を行なわせても差し支えない。In the case of reduction, the conditions B1 to B3 are applied only to the second water heater 6b, but the same conditions as the conditions B1 to B3 are applied to the first water heater 6a or the first water heater 6a. And condition B1 for No. 2 water heater 6b
The determination as to whether or not to suspend the No. 2 water heater 6b may be performed by applying conditions such as B3.

【００３６】[0036]

【発明の効果】本発明の並列型給湯装置によれば、比較
的水温の高い水が流入してきた場合にも最適な台数の給
湯器で給湯して設定温度の湯を出湯させることができ
る。また、給湯器台数の切替えが繁雑に行なわれること
もない。しかも、過流出防止機能が働く前に給湯器を増
数させることができるので、入水温度が設定温度に近い
場合に増数不能になり、大量出湯に応じられなくなる欠
点が解消され、このような場合にも速やかに増数して設
定温度の湯を大量出湯できるようになる。According to the parallel type hot water supply apparatus of the present invention, even when water having a relatively high water temperature flows in, it is possible to supply hot water at an appropriate number of hot water heaters and to discharge hot water at a set temperature. In addition, switching of the number of hot water heaters is not complicated. In addition, since the number of hot water heaters can be increased before the overflow prevention function is activated, it is impossible to increase the number of water heaters when the incoming water temperature is close to the set temperature. Also in this case, the number of hot water at the set temperature can be increased quickly and a large amount of hot water can be discharged.

【００３７】また、給湯器の通過流量が最低作動水量以
下に低下して給湯器が消火する以前に給湯器を減数させ
るので、給湯器の増加、減少の判定のヒステリシスを大
きくでき、給湯器がハンチングを起こしにくくなる。Since the number of hot water heaters is reduced before the hot water heater extinguishes due to the flow rate of the water heater falling below the minimum operating water volume, the hysteresis for determining whether to increase or decrease the number of water heaters can be increased. Hunting is less likely to occur.

【図面の簡単な説明】[Brief description of the drawings]

【図１】本発明の一実施例による並列型給湯装置を示す
概略構成図である。FIG. 1 is a schematic configuration diagram showing a parallel-type hot water supply apparatus according to one embodiment of the present invention.

【図２】（ａ）（ｂ）は同上の並列型給湯装置における
給湯器増数及び減数のための処理を表わすフローチャー
トである。FIGS. 2 (a) and 2 (b) are flowcharts showing processes for increasing and decreasing the number of water heaters in the parallel type hot water supply device.

【図３】従来例の並列型給湯装置を示す概略構成図であ
る。FIG. 3 is a schematic configuration diagram showing a conventional parallel-type hot water supply apparatus.

【符号の説明】[Explanation of symbols]

２ 入水管 ３ 出湯管 ５ａ、５ｂ 分岐管 ６ａ （１号）給湯器 ６ｂ （２号）給湯器 １０ａ、１０ｂ バイパス管 １２ａ、１２ｂ バイパス開閉弁 １５ａ、１５ｂ 過流出防止弁 １７ａ、１７ｂ 分岐管開閉弁 2 Inlet pipe 3 Outlet pipe 5a, 5b Branch pipe 6a (No. 1) Hot water supply 6b (No. 2) Hot water supply 10a, 10b Bypass pipe 12a, 12b Bypass open / close valve 15a, 15b Overflow prevention valve 17a, 17b Branch pipe open / close valve

Claims (1)

(57)【特許請求の範囲】(57) [Claims] 【請求項１】 ２以上の給湯器を並列にして配置し、水
源から送られてくる水を各給湯器に分岐して供給するこ
とにより、それら各給湯器で沸かされた湯の合計を使用
することができるようにした並列型給湯装置において、着火している給湯器について、いずれかの給湯器の燃焼
量と所定の最大燃焼量との差が所定値以下になるか、あ
るいは、いずれかの給湯器の流量と所定の最大流量との
差が所定値以下になった場合に給湯器の着火台数を増加
させ、 着火している給湯器について、いずれかの給湯器の燃焼
量と所定の最低燃焼量との差が所定値以下になるか、あ
るいは、いずれかの給湯器の流量と所定の最低作動流量
との差が所定値以下になった場合に給湯器の着火台数を
減少させるコントローラを備えた、 並列型給湯装置。1. A system in which two or more water heaters are arranged in parallel, and water sent from a water source is branched and supplied to each of the water heaters, so that the sum of the hot water boiled by each of the water heaters is used. In a parallel-type hot water supply device that is capable of performing
Whether the difference between the amount and the predetermined maximum combustion amount is
Alternatively, the flow rate of one of the water heaters and the predetermined maximum flow rate
Increase the number of water heaters ignited when the difference falls below a specified value
Is, for water heater that ignited, either water heater combustion
Whether the difference between the amount and the specified minimum combustion amount is
Or the flow rate of one of the water heaters and the specified minimum operating flow rate
If the difference between the water heater and the
A parallel water heater with a controller to reduce .
JP4019543A 1992-01-07 1992-01-07 Parallel water heater Expired - Fee Related JP2590660B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP4019543A JP2590660B2 (en) 1992-01-07 1992-01-07 Parallel water heater

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP4019543A JP2590660B2 (en) 1992-01-07 1992-01-07 Parallel water heater

Publications (2)

Publication Number Publication Date
JPH06281249A JPH06281249A (en) 1994-10-07
JP2590660B2 true JP2590660B2 (en) 1997-03-12

Family

ID=12002231

Family Applications (1)

Application Number Title Priority Date Filing Date
JP4019543A Expired - Fee Related JP2590660B2 (en) 1992-01-07 1992-01-07 Parallel water heater

Country Status (1)

Country Link
JP (1) JP2590660B2 (en)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP3883800B2 (en) * 2000-10-19 2007-02-21 川重冷熱工業株式会社 Number control method of boiler
JP5418824B2 (en) * 2009-07-31 2014-02-19 株式会社ノーリツ Water heater
RU2497050C1 (en) * 2010-10-21 2013-10-27 Кюндон Уан Корпорейшн Control method of parallel operation of multiple-unit water heater

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63273757A (en) * 1987-05-01 1988-11-10 Noritsu Co Ltd Large capacity hot water maker of parallel type
JPS6463748A (en) * 1987-09-02 1989-03-09 Noritz Corp Hot water supply apparatus with plural hot water suppliers in parallel
JPH0240447A (en) * 1988-07-29 1990-02-09 Rinnai Corp Flow controller for multi-unit type hot water supply apparatus

Also Published As

Publication number Publication date
JPH06281249A (en) 1994-10-07

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