JPH08313052A - Instantaneous water heater and control method therefor - Google Patents
Instantaneous water heater and control method thereforInfo
- Publication number
- JPH08313052A JPH08313052A JP9698396A JP9698396A JPH08313052A JP H08313052 A JPH08313052 A JP H08313052A JP 9698396 A JP9698396 A JP 9698396A JP 9698396 A JP9698396 A JP 9698396A JP H08313052 A JPH08313052 A JP H08313052A
- Authority
- JP
- Japan
- Prior art keywords
- hot water
- water
- water system
- temperature
- water temperature
- 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.)
- Pending
Links
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、湯水を混合して出湯す
る瞬間湯沸器及びその制御方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an instantaneous water heater that mixes hot water with hot water and a method for controlling the same.
【０００２】[0002]
【従来の技術】例えば、図８に示すように、従来の瞬間
湯沸器では、給水部ａから供給された水は熱交換器ｂを
経てバーナｃにより加熱された後、出湯部ｄから出湯す
る給湯機構を構成している。このような瞬間湯沸器での
出湯湯温の制御は、例えば熱交換器ｂの上流側及び下流
側に設けたサーミスタｅ1 、ｅ2 と、流量センサｆとか
らの検出信号に基づき、バーナｃに対する燃料ガスの供
給量を比例制御弁ｇにより調節して行う。即ち、サーミ
スタｅで検出した給水温度と、出湯部ｄから出湯温度
と、流量センサｆで検出した水量とから、設定湯温を実
現するに必要な熱量を発生させるガス量をバーナｃに供
給するために比例制御弁ｇの開度を調節した後、サーミ
スタｅ2 で検出された実際の出湯湯温と、前記設定湯温
とを比較し、その差がなくなるように比例制御弁ｇをフ
ィードバック制御することにより、ガス量を増減する。
なお、ｈは、設定湯温が高温の時に流量過多による湯温
低下を防止するための流量調節弁である。2. Description of the Related Art For example, as shown in FIG. 8, in a conventional instantaneous water heater, water supplied from a water supply section a is heated by a burner c through a heat exchanger b and then tapped from a hot water section d. Constitutes a hot water supply mechanism. The control of the hot water discharge temperature in such an instantaneous water heater is based on detection signals from, for example, thermistors e 1 and e 2 provided on the upstream and downstream sides of the heat exchanger b and the flow rate sensor f. The amount of fuel gas supplied to c is adjusted by the proportional control valve g. That is, from the supply water temperature detected by the thermistor e, the hot water discharge temperature from the hot water discharge part d, and the amount of water detected by the flow rate sensor f, the amount of gas that generates the amount of heat necessary to realize the set hot water temperature is supplied to the burner c. Therefore, after adjusting the opening of the proportional control valve g, the actual hot water temperature detected by the thermistor e 2 is compared with the preset hot water temperature, and the proportional control valve g is feedback-controlled to eliminate the difference. By doing so, the amount of gas is increased or decreased.
In addition, h is a flow rate control valve for preventing a decrease in the hot water temperature due to an excessive flow rate when the set hot water temperature is high.
【０００３】[0003]
【発明が解決しようとする課題】ところで、従来の瞬間
湯沸器では、バーナに対する供給ガス量が変化すること
による出湯湯温の変化が、熱交換器ｂからサーミスタｅ
2 に伝わるまでに、配管内流速に応じた時間遅れが生じ
るため、温度制御の応答性が悪く、出湯湯温が設定湯温
に移行するまで時間を要する。この応答時間の遅れは、
配管内流速を速くすれば、短くすることができるが、配
管内流速を速くすると、配管に腐食の一種である潰食、
又は摩耗腐食とよばれる現象が生じ易くなり、配管の耐
久性を損なう。しかしながら、配管内流速を遅くするた
めには、配管径を太くしなければならないが、その場合
には、時間遅れがより長くなる。By the way, in the conventional instantaneous water heater, a change in the hot water discharged from the heat exchanger b due to a change in the amount of gas supplied to the burner changes from the heat exchanger b to the thermistor e.
Since there is a time delay according to the flow velocity in the pipe before it is transmitted to 2 , the responsiveness of temperature control is poor and it takes time for the hot water temperature to shift to the set hot water temperature. This delay in response time is
If the flow velocity in the pipe is increased, it can be shortened.However, if the flow velocity in the pipe is increased, erosion, which is a type of corrosion on the pipe,
Alternatively, a phenomenon called abrasion corrosion is likely to occur, and the durability of the pipe is impaired. However, in order to reduce the flow velocity in the pipe, the pipe diameter must be increased, but in that case, the time delay becomes longer.
【０００４】そこで、本発明は、制御応答性を高め、安
定した出湯を実現した瞬間湯沸器及びその制御方法を提
供することを目的とする。SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide an instantaneous water heater which improves control response and realizes stable hot water discharge, and a control method thereof.
【０００５】[0005]
【課題を解決するための手段】本発明の瞬間湯沸器及び
その制御方法は、図１〜図７に例示するように、給水を
受ける水系統（Ｃ）と、給水を加熱して湯にする湯系統
（Ｈ）とを備えた瞬間湯沸器及びその制御方法であっ
て、水系統と湯系統との流量比率を特定比率に設定する
とともに、出湯量又は給水温度に応じて湯系統側の設定
湯温を変更することにより、設定湯温に出湯湯温を制御
している。このように湯系統及び水系統の流量比率を固
定すると、出湯量又は給水温度による出湯湯温の制御が
単純化し、制御応答性が早くなる。The instant water heater and its control method of the present invention are, as illustrated in FIGS. 1 to 7, a water system (C) for receiving water supply and heating the water supply to form hot water. An instantaneous water heater with a hot water system (H) and a control method thereof, wherein a flow rate ratio between the water system and the hot water system is set to a specific ratio, and the hot water system side is set according to the amount of hot water discharged or the supply water temperature. By changing the set hot water temperature, the outgoing hot water temperature is controlled to the set hot water temperature. If the flow rate ratio of the hot water system and the water system is fixed in this way, the control of the hot water discharge temperature or the hot water discharge temperature based on the supplied water temperature is simplified, and the control response becomes faster.
【０００６】本発明の瞬間湯沸器は、加熱すべき給水を
受ける水系統（Ｃ）と、給水を加熱する湯系統（Ｈ）と
を備えて、湯系統からの湯水と前記水系統からの水とを
混合して出湯する瞬間湯沸器であって、前記湯系統に設
置されて水を加熱する熱交換器（２）と、燃料ガスが供
給されて前記熱交換器を加熱するバーナ（７）と、前記
水系統からの水と前記湯系統からの湯とを混合する混合
手段（混合弁３）と、前記混合手段に対して前記水系統
と前記湯系統との流量比率を特定の比率に設定し、出湯
量に応じて前記湯系統側の設定湯温を変更することによ
り、設定湯温に出湯湯温を制御する制御手段（６）とを
備えたことを特徴とする。このような構成とすることに
より、出湯量により湯系統側の設定湯温を変更し、所望
の設定湯温の出湯が得られる。The instant water heater of the present invention comprises a water system (C) for receiving the feed water to be heated, and a hot water system (H) for heating the feed water. An instant water heater that mixes with water and discharges hot water, which is a heat exchanger (2) installed in the hot water system to heat water, and a burner (2) to which fuel gas is supplied to heat the heat exchanger ( 7), mixing means (mixing valve 3) for mixing water from the water system and hot water from the hot water system, and a specific flow rate ratio of the water system and the hot water system to the mixing means. It is characterized by further comprising a control means (6) for controlling the outlet hot water temperature to the set hot water temperature by setting a ratio and changing the set hot water temperature on the hot water system side according to the hot water discharge amount. With such a configuration, the set hot water temperature on the hot water system side can be changed according to the hot water discharge amount, and hot water with a desired set hot water temperature can be obtained.
【０００７】また、本発明の瞬間湯沸器は、前記混合手
段に対して前記水系統と前記湯系統との流量比率を特定
の比率に設定し、給水温度に応じて前記湯系統側の設定
湯温を変更することにより、設定湯温に出湯湯温を制御
する制御手段としたものである。このような構成とする
ことにより、給水温度により湯系統側の設定湯温を変更
し、所望の設定湯温の出湯が得られる。Further, in the instant water heater of the present invention, the flow rate ratio between the water system and the hot water system is set to a specific ratio with respect to the mixing means, and the hot water system side is set according to the feed water temperature. By changing the hot water temperature, the control means controls the discharged hot water temperature to the set hot water temperature. With such a configuration, the set hot water temperature on the hot water system side can be changed according to the feed water temperature, and hot water with a desired set hot water temperature can be obtained.
【０００８】また、本発明の瞬間湯沸器の制御方法は、
水系統から加熱すべき給水を受け、その給水を湯系統に
より加熱して得られる湯と前記給水とを混合して出湯さ
せる瞬間湯沸器の制御方法であって、前記混合手段に対
して前記水系統と前記湯系統との流量比率を特定の比率
に設定し、出湯量に応じて前記湯系統側の設定湯温を変
更することにより、設定湯温に出湯湯温を制御すること
を特徴とする。このような構成とすることにより、出湯
量により湯系統側の設定湯温を変更し、所望の設定湯温
の出湯が得られる。The method of controlling the instant water heater of the present invention is
A method for controlling an instantaneous water heater that receives supply water to be heated from a water system and mixes the hot water obtained by heating the supply water with the supply water to release hot water, wherein It is characterized in that the flow rate ratio between the water system and the hot water system is set to a specific ratio, and the hot water temperature is controlled to the set hot water temperature by changing the hot water temperature set on the hot water system side according to the hot water discharge amount. And With such a configuration, the set hot water temperature on the hot water system side can be changed according to the hot water discharge amount, and hot water with a desired set hot water temperature can be obtained.
【０００９】また、本発明の瞬間湯沸器の制御方法は、
前記混合手段に対して前記水系統と前記湯系統との流量
比率を特定の比率に設定し、給水温度に応じて前記湯系
統側の設定湯温を変更することにより、設定湯温に出湯
湯温を制御することを特徴とする。このような構成とす
ることにより、給水温度により湯系統側の設定湯温を変
更し、所望の設定湯温の出湯が得られる。Further, the control method of the instant water heater of the present invention is as follows:
By setting the flow rate ratio between the water system and the hot water system to the mixing means to a specific ratio, and changing the set hot water temperature on the hot water system side according to the feed water temperature, the hot water is discharged to the set hot water temperature. It is characterized by controlling the temperature. With such a configuration, the set hot water temperature on the hot water system side can be changed according to the feed water temperature, and hot water with a desired set hot water temperature can be obtained.
【００１０】そして、本発明の瞬間湯沸器は、前記湯系
統側の設定湯温が高温時、流量を制限する手段（流量制
御弁２１）を備えたことを特徴とする。このような構成
により、流量過多による出湯湯温の低下が防止でき、安
定した湯温の出湯が得られる。The instant water heater of the present invention is characterized by comprising means (flow control valve 21) for limiting the flow rate when the set hot water temperature on the hot water system side is high. With such a configuration, it is possible to prevent a decrease in the hot water temperature due to an excessive flow rate, and it is possible to obtain a stable hot water temperature.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施形態を図面を
参照して説明する。Embodiments of the present invention will be described below with reference to the drawings.
【００１２】図１は、本発明の瞬間湯沸器及びその制御
方法の実施形態を示している。給水部８を経て供給され
た水は、共通系統９を通って分岐部１０から湯系統Ｈ及
び水系統Ｃに分流する。湯系統Ｈに流れた水は熱交換器
２においてバーナ７により加熱され、湯となって混合手
段である混合弁３の第１のポートである湯入力側ポート
ｕ（図２）に至り、また、水系統Ｃに流れた水はそのま
ま第２のポートである水入力側ポートｖに至り、これら
が合流、混合して共通出力側ｗから共通系統１１に流れ
て出湯部１２から出湯する。制御手段６は、温度検出手
段５で検出した湯温に基づき、湯系統Ｈ側の湯温が合流
後の湯温よりも高い温度となるようにバーナ７の燃焼量
をフィードバック制御する。また、制御手段６は、温度
検出手段５で検出された湯系統Ｈ側の湯温が、湯系統Ｈ
側の設定湯温に近づけるように燃料ガスの比例制御弁１
３等を制御して燃焼量を制御する。このようなフィード
バック制御にはフィードフォワード制御を併用してもよ
い。FIG. 1 shows an embodiment of the instant water heater and its control method of the present invention. The water supplied through the water supply unit 8 is divided into the hot water system H and the water system C from the branching unit 10 through the common system 9. The water flowing into the hot water system H is heated by the burner 7 in the heat exchanger 2 and becomes hot water to reach the hot water input side port u (FIG. 2) which is the first port of the mixing valve 3 which is a mixing means. The water flowing to the water system C reaches the water input side port v which is the second port as it is, and these are combined and mixed to flow from the common output side w to the common system 11 to be discharged from the hot water outlet 12. The control means 6 feedback-controls the combustion amount of the burner 7 based on the hot water temperature detected by the temperature detection means 5 so that the hot water temperature on the hot water system H side becomes higher than the hot water temperature after the joining. Further, the control means 6 determines that the hot water temperature on the hot water system H side detected by the temperature detecting means 5 is the hot water system H.
Fuel gas proportional control valve 1 so that it approaches the set hot water temperature
3 and the like are controlled to control the combustion amount. Feedforward control may be used together with such feedback control.
【００１３】以上のフィードバック制御により、湯系統
Ｈ側の湯温は、出湯部１２から出湯される湯温よりも高
い温度とすると共に、温度検出手段４で検出した出湯湯
温を設定湯温に近づけるように混合弁３をフィードバッ
ク制御し、その流量比率を変化させて湯温を制御するこ
とができる。即ち、出湯側の設定湯温を高くした場合に
は、湯系統Ｈ側の流量比率がより高くなるように混合弁
３を制御して出湯湯温を上昇させ、また、出湯側の設定
湯温を低くした場合には、水系統Ｃ側の流量比率が湯系
統Ｈより高くなるように混合弁３を制御して出湯湯温を
低下させることができる。例えば、給水部８から供給さ
れた水の温度（給水温度）が１５℃で、湯系統Ｈ側の湯
温が６５℃となるように制御している場合において、出
湯部１２から４０℃の出湯を得るためには、湯系統Ｈと
水系統Ｃの流量比率を特定比率、即ち、１：１とするよ
うに混合弁３を調節する。また、出湯湯温を４０℃より
も高い湯温が得られるように設定すると、湯系統Ｈの流
量比率が高くなり、また、出湯湯温を４０℃よりも低い
湯温が得られるように設定すると、水系統Ｃの流量比率
が高くなる。最も使用頻度の高い出湯湯温（４０℃前
後）の設定において、湯系統Ｈと水系統Ｃとの流量比率
を特定比率、即ち、１：１程度となるようにすれば、４
０℃近傍の出湯湯温の制御を最も制御性の良い状態で行
うことができ、また、その制御を精度良くきめ細かに行
うことができる。By the above feedback control, the hot water temperature on the hot water system H side is made higher than the hot water temperature discharged from the hot water discharge section 12, and the hot water temperature detected by the temperature detecting means 4 is set to the preset hot water temperature. The mixing valve 3 can be feedback-controlled so as to approach, and the hot water temperature can be controlled by changing the flow rate ratio. That is, when the set hot water temperature on the hot water side is increased, the mixing valve 3 is controlled so that the flow rate ratio on the hot water system H side becomes higher to raise the hot water discharge temperature. When the temperature is lowered, the mixing hot water temperature can be lowered by controlling the mixing valve 3 so that the flow rate ratio on the water system C side becomes higher than that of the hot water system H. For example, when the temperature of the water supplied from the water supply unit 8 (supply water temperature) is 15 ° C. and the temperature of the hot water on the hot water system H side is controlled to 65 ° C. In order to obtain the above, the mixing valve 3 is adjusted so that the flow rate ratio between the hot water system H and the water system C becomes a specific ratio, that is, 1: 1. Further, when the hot water temperature is set to obtain a hot water temperature higher than 40 ° C., the flow rate ratio of the hot water system H becomes high, and the hot water temperature set to obtain a hot water temperature lower than 40 ° C. Then, the flow rate of the water system C increases. When setting the hot water temperature (about 40 ° C.) that is most frequently used, if the flow rate ratio between the hot water system H and the water system C is set to a specific ratio, that is, about 1: 1, 4
The hot water temperature near 0 ° C. can be controlled in the most controllable state, and the control can be performed precisely and finely.
【００１４】そして、この湯温制御において、湯系統Ｈ
側の設定湯温を給水温度に応じて変更する。例えば、出
湯湯温４０℃において、給水温度が１５℃から５℃に低
下した場合には、湯系統Ｈ側の設定湯温を６５℃から７
５℃に上昇させることにより、流量比率は、特定比率で
ある１：１に維持することができる。そして、湯系統Ｈ
側の設定湯温は、給水温度の変化に応じて漸次連続的に
変更するようにしても良いし、段階的に変更するように
しても良い。しかし、混合弁３の流量比率を広い範囲で
変化させることを許容すれば、湯系統Ｈ側の設定湯温を
給水温度にかかわらず常時一定とする制御を行うことも
できる。In this hot water temperature control, the hot water system H
Change the set hot water temperature according to the supply water temperature. For example, when the supplied water temperature is lowered from 15 ° C to 5 ° C at the hot water temperature of 40 ° C, the set hot water temperature on the hot water system H side is changed from 65 ° C to 7 ° C.
By increasing the temperature to 5 ° C., the flow rate ratio can be maintained at the specific ratio of 1: 1. And hot water system H
The set hot water temperature on the side may be gradually and continuously changed according to the change in the feed water temperature, or may be changed stepwise. However, if the flow rate ratio of the mixing valve 3 is allowed to be changed in a wide range, it is possible to perform control such that the set hot water temperature on the hot water system H side is always constant regardless of the feed water temperature.
【００１５】また、出湯湯温は、混合弁３の下流側、即
ち共通出力側ｗの近傍に設けた温度検出手段４で検出し
てフィードバック制御を行うので、制御の遅れ時間が小
さくなり、ハンチングが発生し難く、安定した湯温制御
を行うことができると共に、混合弁３は水系統Ｃと湯系
統Ｈの合計流量を変化させずに流量比率を調節すれば、
制御に際して流量が変化せず、湯温制御が容易である。
また、熱交換器２には、出湯する湯量の全てに対応する
水が流れるのではなく、その一部が熱交換器２をバイパ
スして水系統Ｃ側に流れるので、全てが熱交換器２に流
れる従来のものと比較して、同じ熱交換器を使用した同
一の出湯量であれば熱交換器２を通過する水の流速を遅
くすることができ、潰食が発生しにくくなる。また、同
じ流速条件であれば、出湯量を増大することができる。Further, since the hot water discharge temperature is detected by the temperature detecting means 4 provided on the downstream side of the mixing valve 3, that is, in the vicinity of the common output side w to perform the feedback control, the delay time of the control is reduced and the hunting is performed. Is less likely to occur, and stable hot water temperature control can be performed, and if the mixing valve 3 adjusts the flow rate without changing the total flow rate of the water system C and the hot water system H,
The flow rate does not change during the control, and the hot water temperature control is easy.
In addition, the water corresponding to the total amount of hot water discharged does not flow into the heat exchanger 2, but a part of the water bypasses the heat exchanger 2 and flows toward the water system C, so that all of the heat exchanger 2 Compared with the conventional one that flows through, the flow rate of water passing through the heat exchanger 2 can be slowed down with the same amount of hot water discharged using the same heat exchanger, and erosion is less likely to occur. Further, under the same flow rate condition, the amount of hot water discharged can be increased.
【００１６】また、所望の湯温で出湯している制御状態
において、出湯口を絞る等して出湯量を減少させると、
これに伴って湯系統Ｈ及び水系統Ｃに流れる流量も減少
する。しかしながら、湯系統Ｈ側の流量を大幅に低下さ
せた場合には、熱交換器２が突発的な沸騰等を引き起こ
す等の危険性がある。このような危険性を回避するた
め、制御手段６は、流量検出手段１４で検出した湯系統
Ｈの流量が所定流量以下になる場合には安全対策として
バーナ７の燃焼を停止させる制御を行う。この制御にお
ける流量は、少な過ぎると流量検出手段１４の検出誤差
が無視できなくなるため、ある程度以上の流量が必要で
あって、安全確保のために出湯量の最少限度を生じ、湯
系統Ｈ側の設定湯温を高く維持する制御を行うと、水が
湯系統Ｈと水系統Ｃとに分かれるため、出湯量の最少限
度が従来のものよりも大きくなってしまうという不都合
がある。Further, in a control state in which hot water is discharged at a desired hot water temperature, if the hot water outlet is reduced by, for example, narrowing the hot water outlet,
Along with this, the flow rates of the hot water system H and the water system C also decrease. However, when the flow rate on the hot water system H side is significantly reduced, there is a risk that the heat exchanger 2 may cause sudden boiling or the like. In order to avoid such a risk, the control unit 6 controls the combustion of the burner 7 as a safety measure when the flow rate of the hot water system H detected by the flow rate detection unit 14 becomes equal to or lower than a predetermined flow rate. If the flow rate in this control is too small, the detection error of the flow rate detection means 14 cannot be ignored, so a certain level or more of flow rate is required, and the minimum amount of hot water discharge occurs for ensuring safety, and the hot water system H side When the control for maintaining the set hot water temperature high is performed, the water is divided into the hot water system H and the water system C, so that there is an inconvenience that the minimum limit of the hot water discharge amount becomes larger than that of the conventional one.
【００１７】そこで、制御手段６は、少出湯量時におい
て湯系統Ｈ側の設定湯温を低下させるようにする。この
ように湯系統Ｈ側の設定湯温を低下させると、同じ出湯
湯温を得るために必要な湯系統Ｈ側の流量比率が大きく
なるので、出湯量の最少限度をより下げることができ
る。例えば、前述した条件、即ち、出湯側の設定湯温を
４０℃、給水温度を１５℃、湯系統Ｈ側の設定湯温を６
５℃とし、６リットル／分の出湯を行っている場合に
は、湯系統Ｈ及び水系統Ｃの流量は双方共に３リットル
／分となる。このとき、出湯量が３リットル／分に減少
すると、湯系統Ｈ及び水系統Ｃの流量は双方共に１．５
リットル／分となる。ここで、湯系統Ｈ側の設定湯温を
４５℃に低下させると、出湯量３リットル／分において
は、湯系統Ｈ側の流量が２．５リットル／分、水系統Ｃ
側の流量が０．５リットル／分となる。このため、バー
ナ７の燃焼を停止させる条件として安全のための制御手
順に於ける所定流量を例えば２．５リットル／分（点火
時）、２．０リットル／分（消火時）とすると、湯系統
Ｈ側の設定湯温を高く維持している場合には出湯量を６
リットル／分から３リットル／分に減少していく途上で
バーナ７が消火してしまうのに対し、湯系統Ｈ側の設定
湯温を低くすると、出湯量が３リットル／分に減少して
もバーナ７は消火しない。Therefore, the control means 6 reduces the set hot water temperature on the hot water system H side when the amount of hot water is small. When the set hot water temperature on the hot water system H side is lowered in this way, the flow rate ratio on the hot water system H side required to obtain the same hot water discharge temperature increases, so the minimum limit of the hot water discharge amount can be further lowered. For example, the above-mentioned conditions, that is, the set hot water temperature on the tap water side is 40 ° C., the supply water temperature is 15 ° C., and the set hot water temperature on the hot water system H side is 6
When the temperature is set to 5 ° C. and hot water is discharged at 6 liters / minute, the flow rates of the hot water system H and the water system C are both 3 liters / minute. At this time, if the amount of hot water discharged decreases to 3 liters / minute, the flow rates of the hot water system H and the water system C are both 1.5.
It becomes liter / minute. Here, when the set hot water temperature on the hot water system H side is lowered to 45 ° C., the flow rate on the hot water system H side is 2.5 liters / minute and the water system C is 3 liters / minute.
The flow rate on the side is 0.5 l / min. Therefore, if the predetermined flow rates in the safety control procedure are set to 2.5 liters / minute (when igniting) and 2.0 liters / minute (when extinguishing fire) as conditions for stopping the combustion of the burner 7, the hot water When the set hot water temperature on the system H side is maintained high, the hot water discharge amount is 6
While the burner 7 extinguishes while decreasing from 3 liters / minute to 3 liters / minute, if the set hot water temperature on the hot water system H side is lowered, the burner 7 will burn even if the amount of hot water discharged decreases to 3 liters / minute. 7 does not extinguish the fire.
【００１８】それ故、所望の最少限度以上の出湯量にお
いて、湯系統Ｈの流量が安全のための制御手順の所定流
量よりも多くなるように湯系統Ｈ側の設定湯温を低下さ
せればバーナ７の消火による出湯停止を防止できる。そ
して、出湯量が再び多くなった場合には湯系統Ｈ側の設
定湯温を元の状態に戻すことにより再び適切な流量比率
で制御を行うことができる。Therefore, when the amount of hot water discharged exceeds the desired minimum limit, the set hot water temperature on the hot water system H side is lowered so that the flow rate of the hot water system H becomes higher than the predetermined flow rate of the safety control procedure. It is possible to prevent the hot water from stopping due to the extinguishing of the burner 7. Then, when the amount of discharged hot water becomes large again, the set hot water temperature on the hot water system H side is returned to the original state so that the control can be performed again at an appropriate flow rate ratio.
【００１９】そして、湯系統Ｈ側の設定湯温を変化させ
るために、制御手段６は、出湯量を検出し、出湯量に応
じて設定湯温を変化させるように構成しても良いし、湯
系統Ｈの流量に応じて設定湯温を変化させるように構成
しても良い。この場合、出湯量は、湯系統Ｈの流量検出
手段１４と共に水系統Ｃに流量検出手段１５を設けて、
これらの和により検出することもできるし、共通系統
９、１１の適所に設けた流量検出手段１６により検出す
ることもできる。また、湯系統Ｈ側の設定湯温の変化
は、漸次連続的に行っても良いし、段階的に行っても良
い。In order to change the set hot water temperature on the hot water system H side, the control means 6 may be configured to detect the hot water discharge amount and change the set hot water temperature according to the hot water discharge amount. The set hot water temperature may be changed according to the flow rate of the hot water system H. In this case, the amount of hot water discharged is determined by providing the flow rate detecting means 15 in the water system C together with the flow rate detecting means 14 in the hot water system H,
It can be detected by the sum of these, or can be detected by the flow rate detecting means 16 provided at an appropriate position of the common systems 9 and 11. Further, the change of the set hot water temperature on the hot water system H side may be carried out gradually continuously or stepwise.
【００２０】次に、図４及び図５は、出湯量に応じて湯
系統Ｈ側の設定湯温を変化させる実施例を表わしたもの
である。この実施例においては、出湯量の所定流量とし
て６リットル／分を境界値とし、この境界値以下の出湯
量において、湯系統Ｈ側の設定湯温を変化させている。
また、図４及び図５は、設定湯温の変化を漸次連続的、
段階的に行うものである。図４に示すように、湯系統Ｈ
側の設定湯温を漸次連続的に変化させる方法において
は、混合弁３の流量比率の変化も漸次であるので、図６
に示すように前記境界値の前後に於ける各系統Ｈ、Ｃの
流量の大幅な流量変化がなく、また、図５に示すように
湯系統Ｈ側の設定湯温を段階的に変更する方法において
は、図７に示すように、境界値の前後に於ける混合弁３
の流量比率の変化が大きく、夫々の系統Ｈ、Ｃの流量が
大きく変化するが、制御は容易である。以上の方法にお
いて、境界値は適宜の出湯量に設定することができる
し、後者の方法においては境界値を複数箇所設定して多
段階に変化させることができ、この場合には各段階に於
ける混合弁３の流量比率の変化を小さくすることができ
る。Next, FIG. 4 and FIG. 5 show an embodiment in which the set hot water temperature on the hot water system H side is changed according to the hot water discharge amount. In this embodiment, 6 l / min is set as the boundary value as the predetermined flow rate of the hot water discharge amount, and the set hot water temperature on the hot water system H side is changed when the hot water discharge amount is less than or equal to this boundary value.
4 and 5 show that the change in the set hot water temperature is gradually and continuously
It is done in stages. As shown in FIG. 4, hot water system H
In the method of gradually and continuously changing the set hot water temperature on the side, the change of the flow rate ratio of the mixing valve 3 is also gradual.
As shown in Fig. 5, there is no significant change in the flow rate of each system H and C before and after the boundary value, and as shown in Fig. 5, the set hot water temperature on the hot water system H side is changed stepwise. In Fig. 7, the mixing valve 3 before and after the boundary value is
The change in the flow rate ratio is large, and the flow rates in the respective systems H and C also change greatly, but control is easy. In the above method, the boundary value can be set to an appropriate amount of tap water, and in the latter method, the boundary value can be set in multiple places and changed in multiple stages. The change in the flow rate of the mixing valve 3 can be reduced.
【００２１】次に、湯系統Ｈと水系統Ｃとを合流させる
混合手段である混合弁３の具体例を説明する。図２及び
図３に示すように、混合弁３は、湯入力側ポートｕ及び
水入力側ポートｖの各流路と共通出力側ｗの流路間に、
モータ１７等で回動する弁体１８を設け、この弁体１８
には水を通過させる窓部３０が形成されている。そし
て、この弁体１８は湯入力側ポートｕ又は水入力側ポー
トｖの一方側の流路を開とする回動方向が、他方向側の
流路を閉とする方向であるように配置されている。Next, a specific example of the mixing valve 3 which is a mixing means for joining the hot water system H and the water system C will be described. As shown in FIG. 2 and FIG. 3, the mixing valve 3 includes a flow path between the hot water input side port u and the water input side port v and a common output side w flow path.
A valve body 18 that is rotated by a motor 17 or the like is provided.
A window portion 30 for allowing water to pass therethrough is formed. The valve body 18 is arranged so that the direction of rotation for opening the flow passage on one side of the hot water input side port u or the water input side port v is the direction for closing the flow passage on the other direction side. ing.
【００２２】このような構成において、図３の（ａ）は
湯系統Ｈ側と水系統Ｃ側の流量が等しい状態、図３の
（ｂ）、図３の（ｃ）は夫々水系統Ｃ側、湯系統Ｈ側の
流量の方が他方系統側よりも多い状態を表わしている。
この構成においては、弁体１８及び湯入力側ポートｕ、
水入力側ポートｖの流路を適宜に設計することにより、
流量比率を変化させても合計量が変化しないように容易
に構成することができる。In such a configuration, (a) of FIG. 3 shows a state where the flow rates of the hot water system H side and the water system C side are equal, and (b) of FIG. 3 and (c) of FIG. 3 respectively show the water system C side. , Where the flow rate on the hot water system H side is higher than that on the other system side.
In this configuration, the valve body 18 and the hot water input side port u,
By properly designing the flow path of the water input side port v,
It can be easily configured such that the total amount does not change even if the flow rate ratio is changed.
【００２３】なお、１９は温度検出手段、２０は水ガバ
ナ、２１は高温設定時の流量過多による湯温の低下を防
止するための流量制限手段としての流量制御弁である。Reference numeral 19 is a temperature detecting means, 20 is a water governor, and 21 is a flow rate control valve as a flow rate limiting means for preventing a decrease in the hot water temperature due to an excessive flow rate when a high temperature is set.
【００２４】[0024]
【発明の効果】以上説明したように、本発明によれば、
次のような効果が得られる。 ａ．湯系統と水系統との流量比率を特定比率に設定し、
出湯量に応じて湯系統側の設定湯温を変更するので、出
湯湯温に応じて湯系統側の設定湯温を変更する制御に比
較し、制御応答性が良好になり、安定した湯温の出湯が
でき、より安全性を高めることができる。 ｂ．湯系統と水系統との流量比率を特定比率に設定し、
出湯量に応じて湯系統側の設定湯温を変更するので、給
水温度に応じて湯系統側の設定湯温を変更する制御に比
較し、制御応答性が良好になり、安定した湯温の出湯が
でき、より安全性を高めることができる。 ｃ．出湯湯温が高温時、流量制限を行うので、流量過多
による出湯湯温の低下を防止でき、安定した湯温の出湯
を行うことができる。As described above, according to the present invention,
The following effects can be obtained. a. Set the flow rate ratio between the hot water system and the water system to a specific ratio,
Since the set hot water temperature on the hot water system side is changed according to the amount of hot water discharged, the control response becomes better and the stable hot water temperature is better than the control that changes the set hot water temperature on the hot water system side according to the hot water discharge temperature. The hot water can be discharged and the safety can be improved. b. Set the flow rate ratio between the hot water system and the water system to a specific ratio,
Since the set hot water temperature on the hot water system side is changed according to the amount of hot water discharged, compared to the control that changes the set hot water temperature on the hot water system side according to the water supply temperature, the control response becomes better and a stable hot water temperature is maintained. The hot spring can be discharged and the safety can be improved. c. Since the flow rate is restricted when the hot water temperature is high, it is possible to prevent a decrease in the hot water temperature due to an excessive flow rate, and it is possible to perform a stable hot water discharge.
【図１】本発明の瞬間湯沸器及びその制御方法の実施形
態を示す図である。FIG. 1 is a diagram showing an embodiment of an instant water heater and a control method thereof according to the present invention.
【図２】混合弁の一例を示す断面図である。FIG. 2 is a cross-sectional view showing an example of a mixing valve.
【図３】混合弁の動作を示す図２のＸ−Ｘ線断面図であ
る。FIG. 3 is a sectional view taken along line XX of FIG. 2 showing the operation of the mixing valve.
【図４】湯温制御動作を示すグラフである。FIG. 4 is a graph showing a hot water temperature control operation.
【図５】湯温制御動作を示すグラフである。FIG. 5 is a graph showing a hot water temperature control operation.
【図６】図４の湯温制御動作による各系統の流量変化を
示すグラフである。6 is a graph showing changes in the flow rate of each system due to the hot water temperature control operation of FIG.
【図７】図５の湯温制御動作による各系統の流量変化を
示すグラフである。7 is a graph showing changes in the flow rate of each system due to the hot water temperature control operation of FIG.
【図８】従来の瞬間湯沸器を示す図である。FIG. 8 is a view showing a conventional instantaneous water heater.
Ｈ 湯系統 Ｃ 水系統 ２ 熱交換器 ３ 混合弁（混合手段） ６ 制御手段 ７ バーナ １２ 出湯部 １９ 温度検出手段 ２１ 流量制御弁（流量制限手段） H hot water system C water system 2 heat exchanger 3 mixing valve (mixing means) 6 control means 7 burner 12 hot water part 19 temperature detecting means 21 flow control valve (flow limiting means)
───────────────────────────────────────────────────── フロントページの続き (72)発明者 永田 昌 静岡県富士市西柏原新田201番地 高木産 業株式会社内 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masa Nagata 201 Nishidawarashibara, Fuji City, Shizuoka Prefecture Takagi Industrial Co., Ltd.
Claims (5)
水系統からの給水を加熱する湯系統とを備えて、湯系統
からの湯水と前記水系統からの水とを混合して出湯する
瞬間湯沸器であって、 前記湯系統に設置されて水を加熱する熱交換器と、 燃料ガスが供給されて前記熱交換器を加熱するバーナ
と、 前記水系統からの水と前記湯系統からの湯とを混合する
混合手段と、 前記混合手段に対して前記水系統と前記湯系統との流量
比率を特定の比率に設定し、出湯量に応じて前記湯系統
側の設定湯温を変更することにより、設定湯温に出湯湯
温を制御する制御手段と、 を備えたことを特徴とする瞬間湯沸器。1. A water system for receiving water to be heated and a hot water system for heating the water supplied from this water system are provided, and hot water from the hot water system and water from the water system are mixed and discharged. An instantaneous water heater, which is installed in the hot water system to heat water, a burner supplied with fuel gas to heat the heat exchanger, water from the water system and the hot water system Mixing means for mixing the hot water from the hot water, and the flow rate ratio of the water system and the hot water system to the mixing means is set to a specific ratio, and the set hot water temperature on the hot water system side is set according to the amount of hot water discharged. An instantaneous water heater comprising: control means for controlling the hot water temperature by changing the hot water temperature to a set hot water temperature.
水系統からの給水を加熱する湯系統とを備えて、湯系統
からの湯水と前記水系統からの水とを混合して出湯する
瞬間湯沸器であって、 前記湯系統に設置されて水を加熱する熱交換器と、 燃料ガスが供給されて前記熱交換器を加熱するバーナ
と、 前記水系統からの水と前記湯系統からの湯とを混合する
混合手段と、 給水温度を検出する手段と、 前記混合手段に対して前記水系統と前記湯系統との流量
比率を特定の比率に設定し、前記給水温度に応じて前記
湯系統側の設定湯温を変更することにより、設定湯温に
出湯湯温を制御する制御手段と、 を備えたことを特徴とする瞬間湯沸器。2. A water system for receiving water to be heated and a hot water system for heating the water supplied from this water system are provided, and hot water from the hot water system and water from the water system are mixed and discharged. An instantaneous water heater, which is installed in the hot water system to heat water, a burner supplied with fuel gas to heat the heat exchanger, water from the water system and the hot water system Mixing means for mixing the hot water from the, the means for detecting the water supply temperature, the flow rate ratio of the water system and the hot water system to the mixing means is set to a specific ratio, depending on the water supply temperature An instantaneous water heater comprising: a control unit that controls the hot water temperature set to the preset hot water temperature by changing the hot water temperature set on the hot water system side.
給水を湯系統により加熱して得られる湯と前記給水とを
混合して出湯させる瞬間湯沸器の制御方法であって、 混合手段に対して前記水系統と前記湯系統との流量比率
を特定の比率に設定し、出湯量に応じて前記湯系統側の
設定湯温を変更することにより、設定湯温に出湯湯温を
制御することを特徴とする瞬間湯沸器の制御方法。3. A method for controlling an instantaneous water heater which receives supply water to be heated from a water system and mixes the hot water obtained by heating the supply water with the supply water to discharge hot water. The flow rate ratio between the water system and the hot water system is set to a specific ratio, and the hot water temperature is controlled to the set hot water temperature by changing the hot water temperature set on the hot water system side according to the hot water discharge amount. A method for controlling an instantaneous water heater, comprising:
給水を湯系統により加熱して得られる湯と前記給水とを
混合して出湯させる瞬間湯沸器の制御方法であって、 混合手段に対して前記水系統と前記湯系統との流量比率
を特定の比率に設定し、給水温度に応じて前記湯系統側
の設定湯温を変更することにより、設定湯温に出湯湯温
を制御することを特徴とする瞬間湯沸器の制御方法。4. A method for controlling an instantaneous water heater which receives supply water to be heated from a water system, mixes the hot water obtained by heating the supply water with a hot water system, and discharges the hot water. In contrast to this, the flow rate ratio between the water system and the hot water system is set to a specific ratio, and the set hot water temperature on the hot water system side is changed according to the feed water temperature, thereby controlling the hot water temperature at the set hot water temperature. A method for controlling an instantaneous water heater, comprising:
を制限する手段を備えたことを特徴とする請求項１又は
請求項２記載の瞬間湯沸器。5. The instant water heater according to claim 1 or 2, further comprising means for limiting a flow rate when the hot water temperature set on the hot water system side is high.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9698396A JPH08313052A (en) | 1996-04-18 | 1996-04-18 | Instantaneous water heater and control method therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9698396A JPH08313052A (en) | 1996-04-18 | 1996-04-18 | Instantaneous water heater and control method therefor |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1006595A Division JP2547836B2 (en) | 1989-01-13 | 1989-01-13 | Hot water supply control method for instant water heater |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08313052A true JPH08313052A (en) | 1996-11-29 |
Family
ID=14179457
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP9698396A Pending JPH08313052A (en) | 1996-04-18 | 1996-04-18 | Instantaneous water heater and control method therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08313052A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2016132540A1 (en) * | 2015-02-20 | 2017-08-17 | 三菱電機株式会社 | Heat exchange device and heat pump type water heater |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5997449A (en) * | 1982-11-25 | 1984-06-05 | Matsushita Electric Ind Co Ltd | Heating control device |
-
1996
- 1996-04-18 JP JP9698396A patent/JPH08313052A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5997449A (en) * | 1982-11-25 | 1984-06-05 | Matsushita Electric Ind Co Ltd | Heating control device |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPWO2016132540A1 (en) * | 2015-02-20 | 2017-08-17 | 三菱電機株式会社 | Heat exchange device and heat pump type water heater |
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