JP2004125228A - Water heater - Google Patents

Water heater Download PDF

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Publication number
JP2004125228A
JP2004125228A JP2002287322A JP2002287322A JP2004125228A JP 2004125228 A JP2004125228 A JP 2004125228A JP 2002287322 A JP2002287322 A JP 2002287322A JP 2002287322 A JP2002287322 A JP 2002287322A JP 2004125228 A JP2004125228 A JP 2004125228A
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JP
Japan
Prior art keywords
water
hot water
pipe
heater
switching valve
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.)
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Application number
JP2002287322A
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Japanese (ja)
Inventor
Tomohiro Nakamura
中村 知広
Masashi Okabe
岡部 優志
Masakatsu Sakamoto
坂本 正勝
Takamitsu Ejima
江嶋 孝光
Bunji Kamimura
上村 分二
Koichi Tanaka
田中 幸一
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sekisui Chemical Co Ltd
Sekisui Kanzai Technics KK
Original Assignee
Sekisui Chemical Co Ltd
Sekisui Kanzai Technics KK
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Priority to JP2002287322A priority Critical patent/JP2004125228A/en
Publication of JP2004125228A publication Critical patent/JP2004125228A/en
Withdrawn legal-status Critical Current

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  • Domestic Hot-Water Supply Systems And Details Of Heating Systems (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To provide a water heater for shortening waiting time until hot water of a proper temperature can be used, and reusing disposal water when starting to use at the beginning. <P>SOLUTION: A hot water faucet 3, a temperature detector 4, a pump 5, a heater 6 and a switching valve 7 are arranged in this order in a hot water appearing pipe 2 of a water heater 1 having a water flow detector M in a primary side pipe, and one pipe 9 appearing from the switching valve 7 is connected to the vicinity of the water heater 1 of the hot water appearing pipe 2, and the other pipe appearing from the switching valve 7 is formed as a drain pipe 10. <P>COPYRIGHT: (C)2004,JPO

Description

【0001】
【発明の属する技術分野】
本発明は、即湯システムが組み込まれた給湯器に関する。
【0002】
【従来の技術】
ガス等を燃料とする瞬間湯沸かし器による給湯設備では、設備湯水栓を開とすることで瞬間湯沸かし器に点火し、湯沸かし器一次側に供給される水道水が加熱されて湯となり、出湯管を通って水栓から流出し使用される。この場合、瞬間湯沸かし器と水栓との間の出湯管内に滞留している水は低温であり、湯水栓から流出する水はその滞留水がなくなるまでは低温のままであるために、通常は使用されずに排水として廃棄されることが多く、水が無駄になっている。
【0003】
これを防ぐために、即湯システムが組み込まれた給湯設備が提案されている。即ち、加熱された湯が流入する入湯部と出湯端末につながる出湯部とを結ぶ給湯管と、入湯管から分岐して他方端末が出湯端末につながる戻り管と、給湯管と戻り管との間で湯を循環させるための循環駆動手段と、給湯管と戻り管との間を循環する湯を加熱するための保温手段とを備え、入湯側を熱源部に接続して使用される即湯ユニットが提案されている。この即湯ユニットは、循環駆動手段により給湯管と戻り管の間で湯を循環させ保温手段により加熱する即湯運転中に、熱源器側から出湯端末使用検出信号を受け取ると循環駆動手段を停止させる制御手段を有するものである。(例えば、特許文献1参照。)
【0004】
この即湯ユニットの保温手段には電気ヒーターを使用しており、即湯スイッチONとともに循環及び加熱を開始して、循環配管内の滞留水を加熱して適温としている。この即湯ユニットは、出湯端末で湯を使用中、一時的に湯の使用を停止し再び使用する場合に、給湯管内の滞留水が保温されていて出湯端末開栓とほぼ同時に所望の温度の湯が使用可能となる。即ち、使用中には、出湯水栓開栓後、適温水が出てくる迄の待ち時間がほとんどない。
【0005】
【特許文献1】特開平2000−18625号公報
【0006】
【発明が解決しようとする課題】
しかしながら、この即湯ユニットでは、最初に湯を使用する場合には、循環配管内の水は加熱されておらず、即湯スイッチをONにしても、循環水の加熱が電気ヒーターであってこのヒーターの目的が滞留水の保温であり、従って循環配管中の滞留水を所望の温度まで加熱するには多くの時間が掛かっていた。従って、この即湯ユニットの場合は、最初に湯を使う場合は、給湯器から供給される湯は十分に高温の湯であるが、循環配管に残留している水が冷水のままであるために、初流は適温になるまでに時間が多く掛かり、しかもその間の適温以下の水は廃棄されていた。
【0007】
本発明は、上記従来の給湯設備における、最初に使用し始める時に、適温の湯が使用可能になるまでの待ち時間が短く、更に、廃棄する水を再利用する給湯装置を提供する目的で行われたものである。
【0008】
【課題を解決するための手段】
上記目的を達成するための本発明の給湯装置は、1次側管に水流検知器を備えた湯沸かし器の出湯管に、湯水栓、温度検知器、ポンプ、加熱器、切替弁がこの順に設けられ、切替弁から出る一方の管が出湯管の湯沸かし器近傍に接続され、切替弁から出る他方の管が排水管とされていることを特徴とする給湯装置である。
【0009】
この給湯装置は、水流検知器で水流がないと検知された時に、温度検知器で検出された水温が所定温度未満であると温度検知器から出力信号が発信されたら、その信号により加熱器とポンプとがいずれも作動せず、同時に切替弁が排水管側となる。水温が所定温度以上であると出力信号が発信されたら、その信号により加熱器とポンプとがいずれも作動し、同時に切替弁が戻し管側となる。また、水流検知器で水流があると検知された時に、温度検知器で検出された水温が所定温度未満であると温度検知器から出力信号が発信されたら、その信号により加熱器は作動せずポンプが作動し、同時に切替弁が排水管側となる。水温が所定温度以上であると出力信号が発信されたら、その信号により加熱器とポンプとがいずれも作動せず、切替弁が戻し管側に切り替わるようにされている。即ち、いわゆる即湯システムを備えたものである。
【0010】
本発明に用いられる湯沸かし器は、通常の上水道を1次側水とする、都市ガス等を燃料とする先止め式瞬間湯沸かし器である。又、出湯管等配管は、通常の温水用配管がそのまま適用され、材料や工法は特に限定されない。
【0011】
湯沸かし器には、その1次側配管に水流検知器として流量計又は圧力計が設けられ、湯水栓が解放されて水が流れたことを検知し、その検知信号により湯沸かし器のガスバーナーに点火し湯を沸かすものである。
【0012】
温度検知器は、通常の電気信号発信型温度検出装置であればよく、特に限定されないが、例えば熱電対を検出端子とし電位差を信号として出力可能な形式のものなどが挙げられる。
【0013】
加熱器は、滞留水を保温可能な熱量を発生可能であれば特に限定されないが、発熱量が小さすぎると寒冷時期には保温が不十分となったり、大きすぎても過剰設備となるだけであるから、滞留水の容量や設置地域によって適宜選択して決められればよい。通常は、使い易さとメンテナンスの容易さから、電気発熱ヒーターが多用される。
【0014】
ポンプは熱水使用に耐えられるものであり、かつキャビテーションを起こしにくいものであれば特に限定されないが、錆びにくいのものが望ましい。例えば、通常のステンレススチール製カスケードポンプ、渦巻きポンプ等が適している。
【0015】
逆止弁が使用される場合は、その逆止弁は、湯沸かし器出湯管の吐出圧に耐えて、水又は湯が戻し管に逆流することを防止する役割を有する。従って、その形式は、熱水使用に耐え錆びにくいものであれば特に限定されない。
【0016】
切替弁は、熱水使用に耐えて、1方向から流入し2方向に流出するいわゆる三方弁であれば特に限定されず、どのような流路切替手段を有する弁であっても構わない。又流路の切り替えは、温度計の信号により流路が切り替わる自動切り替え型であることが好ましいが、故障の発生に備えて手動切り替えも可能であることが望ましい。
【0017】
出湯管の湯沸かし器近傍に接続される、切替弁から出ている一方の管には、戻り管と出湯管との接続部と切替弁との間に、逆止弁が取り付けられても良い。この逆止弁は、出湯管を流れる加熱水が、必ず湯水栓側に流れるように用いられる。
【0018】
排水管は、低温の貯留水を中水として利用するために、別に用意されたタンク等に配管される。中水を使うことがなければ、排水として捨てても構わない。
【0019】
(作用)
本発明の給湯装置は、1次側管に水流検知器を備えた湯沸かし器の出湯管に、湯水栓、温度検知器、ポンプ、加熱器、切替弁がこの順に設けられ、切替弁から出る一方の管が出湯管の湯沸かし器近傍に接続されて戻し管とされ、切替弁から出る他方の管が排水管とされているので、切替弁を切り替えることにより、出湯管から戻し管までの管中に滞留している水を、排水管の方に排出することができる。
【0020】
この給湯装置は、水流検知器で水流がないと検知された時に、温度検知器で検出された水温が所定温度未満であると温度検知器から出力信号が発信されたら、その信号により加熱器とポンプとはいずれも停止し、同時に切替弁が排水管側となる。所定温度以上であると出力信号が発信されたら、その信号により加熱器とポンプとがいずれも作動し、切替弁は戻し管側となる。従って、即湯システムを起動した時には、切替弁が排水管側とされて、出湯管中には湯沸かし器で加熱された水が充満されて滞留するので、湯水栓で適温の湯が出るまでの時間が短縮される。この滞留水の温度が高くなったら、切替弁が戻し管側とされて、滞留水は加熱器で冷めないように保温されつつ、戻し管を通って出湯管に戻されてポンプで循環される。従って貯留水は冷めないので、湯水栓開栓後直ちに適温の湯が使用できる。
【0021】
水流検知器で水流があると検知された時に、温度検知器で検出された水温が所定温度未満であると温度検知器から出力信号が発信されたら、その信号により加熱器は作動せずポンプが作動し同時に切替弁が排水管側となり、所定温度以上であると出力信号が発信されたら、その信号により加熱器及びポンプはいずれも作動せず切替弁が戻し管側に切り替わるようにされているので、使用中は湯沸かし器で加熱された水が湯水栓から出、使用中に一時使用を中止し再び使用するまでの出湯待機段階では、出湯管中の滞留水を加熱器によって加熱を行うので、湯水栓で適温の湯が出るまでの時間が短縮される。
【0022】
【発明の実施の形態】
次に本発明を図面を参照して説明する。図1は本発明の給湯装置の一例の配管図である。但し、本例では、戻り管9と出湯管1との接続部と切替弁7との間に、逆止弁8が取り付けられているものの一例を示す。
【0023】
給湯装置には、1次側に上水道である先止め式ガス瞬間湯沸かし器1の内面耐熱塩化ビニルライニング鋼管製出湯管2に、湯使用箇所である湯水栓等3、熱電対型温度センサー付き温度検出器4、ステンレススチール製渦巻きポンプ5、電気ヒーター式加熱器6、ステンレススチール製電動三方切替弁7がこの順に設けられ、切替弁7から出る一方の管にステンレススチール製逆止弁8が設けられて出湯管2の湯沸かし器1近傍に接続される戻し管9とされ、切替弁7から出る他方の管が排水管10とされている。排水管10は中水用貯留タンク(図示せず)に接続されている。
【0024】
1次側の上水道配管には水流検知器Mが設けられている。本例の場合は、この検知器Mは水圧計とされおり、湯水栓3が解放されて水が使用状態となった時に圧力が下がるので、これを検知して信号を発信し、瞬間湯沸かし器1のガスバーナーを点火して湯を沸かす機構とされている。勿論、水流検知器Mとしては、水流の有無を検知して信号を発信するものであれば特に限定されず、例えば、本例のような水圧計でなく、流量計等であっても構わないことは言うまでもない。
【0025】
温度検出器4は、熱電対型温度センサーからの信号を受けて温度を指示すると共に、所望の温度で電気ヒーター式加熱器6及びポンプ5を起動、停止させるためのリレーを作動する信号、並びに流路を切り替えるための電動三方切替弁7を作動するリレーを作動させる信号を出力する。この温度検出器4は、リレー回路、電源スイッチ等と共に即湯ユニットSに格納されている。即湯ユニットの作動状態は、以下に記載する実施の各種場合で説明する。
【0026】
なお、即湯ユニットの電源スイッチ(以下、即湯スイッチという。)をOFFとしてある場合は、水流の有無に関わらず、加熱器6とポンプ5とはOFF、切替弁7は戻し管9側の状態とされている。
【0027】
次に本発明の給湯装置の使用状態を、各種場合毎に説明する。図2は湯水栓3が閉、即ち水流がない状態で、かつ貯留水が所定温度未満の場合に、即湯スイッチをONとした場合の使用状態を示す説明図である。
【0028】
この状態は、最初に給湯装置を使う際に即湯スイッチをONにした場合等である。即湯スイッチをONにすると、電気ヒーター式加熱器6とポンプ5とはいずれもOFFとなり、同時に切替弁7が排水管10側となる。従ってこの状態で、湯沸かし器1の一次側に接続された上水道の水圧により、水は出湯管2を通り、切替弁7から排水管10に流れる。従って上水道の水は湯沸かし器により加熱され、管路内の貯留水が湯に置き換わり、その温度が極めて早く上昇し、湯待ち時間が少なくなる。又ガス等で加熱するので、燃料コストが安価となる。
【0029】
図3は湯水栓3が閉とされかつ貯留水が所定温度以上の場合に、即湯スイッチをONとした場合の使用状態を示す説明図である。
【0030】
上述の使用開始時の状態で貯留水の温度が上昇した場合や、使用中に一時的に湯水栓3を閉とした場合である。加熱器4とポンプ5とがいずれもONとなり、切替弁7は戻し管9側となる。従って、貯留水は電気ヒーター5により加熱保温されて、ポンプ5により出湯管2と戻し管9との間を循環している。従って、いつ湯水栓3が開とされても待ち時間なしに所望の温度の湯が出る。
【0031】
図4は湯水栓3が開、即ち水流がある状態で、かつ貯留水が所定温度未満の場合に、即湯スイッチをONとした場合の使用状態を示す説明図である。
【0032】
湯を使用するために、即湯スイッチをONとして直後に湯水栓3を開とした場合である。加熱器6がOFF、ポンプ5がON、切替弁7が排水管10側となる。出湯管2内の貯留水の水温が低いので、湯水栓3からは所定温度以下の水が出るが、湯水栓3以降の管中の貯留水が排水管10側に排出されるので、比較的速やかに出湯管2中の水は湯に置き換わり、待ち時間が少なくなる。
【0033】
図5は湯水栓3が開とされかつ貯留水が所定温度以上の場合に、即湯スイッチをONとした場合の使用状態を示す説明図である。
【0034】
通常に連続して湯を使用している状態である。加熱器6とポンプ5とがいずれも作動せず切替弁7が戻し管10側に切り替わるようにされている。即ち、通常の湯沸かし器による給湯と同じ状態である。
【0035】
【発明の効果】
以上の通りであるから、本発明の給湯装置は、最初に使用し始める時に、適温の湯が使用可能になるまでの待ち時間が短く、更に、廃棄する水を再利用する給湯装置となるのである。
【0036】
加えて、出湯待機状態までの時間が長くシステムの稼働時間が長いために即湯スイッチのON−OFFが不適当であり、それ故に即湯スイッチを入れっぱなしとしていた従来の方式と比較して、本給湯装置は、出湯待機時間が短くて済むので、即湯スイッチを頻繁にON−OFFすることが可能となり、エネルギー消費量を更に減少させることが可能である。
【図面の簡単な説明】
【図1】本発明の給湯装置の一例の配管図である。
【図2】湯水栓が閉、貯留水温度が低の場合の使用状態を示す説明図である。
【図3】湯水栓が閉、貯留水温度が高の場合の使用状態を示す説明図である。
【図4】湯水栓が開、貯留水温度が低の場合の使用状態を示す説明図である。
【図5】湯水栓が開、貯留水温度が高の場合の使用状態を示す説明図である。
【符号の説明】
1 先止め式ガス瞬間湯沸かし器
2 出湯管
3 湯水栓
4 温度検出器
5 ポンプ
6 加熱器
7 切替弁
8 逆止弁
9 戻し管
10 排水管
S 即湯ユニット
M 水流検知器
[0001]
TECHNICAL FIELD OF THE INVENTION
TECHNICAL FIELD The present invention relates to a water heater in which a hot water system is incorporated.
[0002]
[Prior art]
In a hot water supply system using an instantaneous water heater that uses gas or the like as fuel, the instantaneous water heater is ignited by opening the facility water faucet, the tap water supplied to the water heater primary side is heated to become hot water, and the water passes through the tap water pipe. Used from the stopper. In this case, the water staying in the tapping pipe between the instantaneous water heater and the faucet is at a low temperature, and the water flowing out of the faucet stays at a low temperature until the remaining water is exhausted. Instead, they are often discarded as wastewater, wasting water.
[0003]
In order to prevent this, hot water supply equipment incorporating a hot water system has been proposed. That is, a hot water supply pipe connecting a hot water supply section into which a heated hot water flows and a hot water supply section connected to a hot water supply terminal, a return pipe branched from the hot water supply pipe and the other terminal connected to the hot water supply terminal, and between the hot water supply pipe and the return pipe. A hot water unit that is provided with a circulation driving means for circulating hot water and a heat retaining means for heating hot water circulating between the hot water supply pipe and the return pipe, wherein the hot water side is connected to a heat source part and used Has been proposed. This hot water unit stops the circulation driving means when receiving a hot water terminal use detection signal from the heat source unit during the hot water operation in which hot water is circulated between the hot water supply pipe and the return pipe by the circulation driving means and heated by the heat retaining means. Control means for causing the (For example, refer to Patent Document 1.)
[0004]
An electric heater is used as a heat retaining means of the hot water unit, and circulation and heating are started when the hot water switch is turned on, and the water retained in the circulation pipe is heated to an appropriate temperature. This hot water unit, when using hot water at the hot water supply terminal, temporarily stops using hot water and uses it again when the hot water stays in the hot water supply pipe is kept warm and the desired temperature is almost at the same time as the hot water supply terminal is opened. Hot water can be used. That is, during use, there is almost no waiting time until the appropriate temperature water comes out after the tap water tap is opened.
[0005]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2000-18625
[Problems to be solved by the invention]
However, in this instant hot water unit, when hot water is used for the first time, the water in the circulation pipe is not heated, and even if the instant hot water switch is turned on, the heating of the circulating water is performed by the electric heater. The purpose of the heater was to keep the retained water warm, and it took a lot of time to heat the retained water in the circulation pipe to a desired temperature. Therefore, in the case of this hot water unit, when hot water is used for the first time, the hot water supplied from the water heater is sufficiently hot water, but the water remaining in the circulation pipe remains cold water. In addition, it took a long time for the first stream to reach an appropriate temperature, and water below the appropriate temperature during that time was discarded.
[0007]
SUMMARY OF THE INVENTION The present invention has been made to provide a hot water supply apparatus in the above-described conventional hot water supply equipment, in which when waiting for the first use, a waiting time until hot water of an appropriate temperature becomes usable is short, and further, waste water is reused. It has been done.
[0008]
[Means for Solving the Problems]
In order to achieve the above object, the hot water supply apparatus of the present invention is provided with a water faucet, a temperature detector, a pump, a heater, and a switching valve in this order on a tapping pipe of a water heater provided with a water flow detector on a primary side pipe. The water supply apparatus is characterized in that one pipe coming out of the switching valve is connected near the water heater of the tapping pipe, and the other pipe coming out of the switching valve is a drain pipe.
[0009]
This water heater is configured such that when an output signal is transmitted from the temperature detector when the water temperature detected by the temperature detector is lower than a predetermined temperature when the water flow detector detects that there is no water flow, the heater and the heater are operated by the signal. Neither the pump nor the pump operates, and at the same time the switching valve is on the drain pipe side. When an output signal is transmitted when the water temperature is equal to or higher than the predetermined temperature, both the heater and the pump are operated by the signal, and at the same time, the switching valve is on the return pipe side. When an output signal is transmitted from the temperature detector when the water temperature detected by the temperature detector is lower than a predetermined temperature when the water flow detector detects that there is a water flow, the heater is not operated by the signal. The pump operates, and at the same time, the switching valve is on the drain pipe side. When an output signal is transmitted when the water temperature is equal to or higher than the predetermined temperature, neither the heater nor the pump is operated by the signal, and the switching valve is switched to the return pipe side. That is, a so-called instant hot water system is provided.
[0010]
The water heater used in the present invention is a stop-on instant water heater using city water or the like as fuel and using ordinary water supply as primary water. In addition, ordinary piping for hot water is directly applied to the piping such as a tapping pipe, and the material and the construction method are not particularly limited.
[0011]
The water heater is provided with a flow meter or a pressure gauge as a water flow detector on a primary side pipe thereof, detects that the water faucet is opened and that water flows, and ignites a gas burner of the water heater by a detection signal thereof. Is to boil.
[0012]
The temperature detector is not particularly limited as long as it is a normal electric signal transmission type temperature detection device, and examples thereof include a type in which a thermocouple is used as a detection terminal and a potential difference can be output as a signal.
[0013]
The heater is not particularly limited as long as it can generate heat that can keep the retained water warm, but if the calorific value is too small, the heat retention becomes insufficient during the cold season, or it becomes just too large even if it is too large. Therefore, it may be appropriately selected and determined depending on the capacity of the retained water and the installation area. Normally, electric heaters are frequently used because of ease of use and maintenance.
[0014]
The pump is not particularly limited as long as it can withstand the use of hot water and does not easily cause cavitation. For example, an ordinary stainless steel cascade pump, spiral pump, or the like is suitable.
[0015]
When a non-return valve is used, the non-return valve has the role of withstanding the discharge pressure of the water heater discharge pipe and preventing water or hot water from flowing back to the return pipe. Therefore, the type is not particularly limited as long as it is resistant to hot water and resistant to rust.
[0016]
The switching valve is not particularly limited as long as it is a so-called three-way valve that withstands the use of hot water and flows in from one direction and flows out in two directions, and may be a valve having any flow path switching means. The switching of the flow path is preferably an automatic switching type in which the flow path is switched by a signal from a thermometer, but it is desirable that manual switching can be performed in preparation for occurrence of a failure.
[0017]
A check valve may be attached to one of the pipes connected to the water heater near the water heater and coming out of the switching valve, between the connection between the return pipe and the hot water pipe and the switching valve. This check valve is used so that the heated water flowing through the tapping pipe always flows to the hot water tap side.
[0018]
The drain pipe is piped to a separately prepared tank or the like in order to use low-temperature stored water as middle water. If you do not use middle water, you can throw it away as wastewater.
[0019]
(Action)
The hot water supply device of the present invention is provided with a water faucet, a temperature detector, a pump, a heater, and a switching valve in this order on a tapping pipe of a water heater provided with a water flow detector on a primary side pipe, and one of the outlets from the switching valve. The pipe is connected near the water heater of the tapping pipe to form a return pipe, and the other pipe coming out of the switching valve is used as a drain pipe.By switching the switching valve, the pipe stays in the pipe from the tapping pipe to the return pipe. The draining water can be discharged to the drain.
[0020]
This water heater is configured such that when an output signal is transmitted from the temperature detector when the water temperature detected by the temperature detector is lower than a predetermined temperature when the water flow detector detects that there is no water flow, the heater and the heater are operated by the signal. Both of the pumps are stopped, and at the same time, the switching valve is on the drain pipe side. When an output signal is transmitted when the temperature is equal to or higher than the predetermined temperature, both the heater and the pump are operated by the signal, and the switching valve is set on the return pipe side. Therefore, when the hot water system is started, the switching valve is set to the drain pipe side, and the water heated by the water heater is filled and stays in the tapping pipe. Is shortened. When the temperature of the stagnant water increases, the switching valve is set to the return pipe side, and the stagnant water is returned to the tapping pipe through the return pipe and circulated by the pump while keeping the temperature of the stagnant water so as not to be cooled by the heater. . Therefore, since the stored water is not cooled, hot water of an appropriate temperature can be used immediately after the hot water tap is opened.
[0021]
When an output signal is sent from the temperature detector when the water temperature detected by the temperature detector is lower than a predetermined temperature when the water flow detector detects that there is a water flow, the heater is not activated by the signal and the pump is not operated. At the same time, when the switching valve is on the drain pipe side and the output signal is transmitted when the temperature is equal to or higher than the predetermined temperature, neither the heater nor the pump is operated by the signal, and the switching valve is switched to the return pipe side. So, during use, the water heated by the water heater comes out of the water tap, and during the hot water standby stage until temporarily stopped during use and used again, the water remaining in the hot water pipe is heated by the heater, The time required for hot water at the hot water tap to flow is reduced.
[0022]
BEST MODE FOR CARRYING OUT THE INVENTION
Next, the present invention will be described with reference to the drawings. FIG. 1 is a piping diagram of an example of the hot water supply device of the present invention. However, in this example, an example is shown in which a check valve 8 is attached between a connection portion between the return pipe 9 and the tapping pipe 1 and the switching valve 7.
[0023]
In the hot water supply system, the inside of a gas-fired water heater 1 with a front end, which is a water supply system on the primary side, a hot water pipe 2 made of heat-resistant vinyl chloride lining steel pipe, a hot-water tap 3 where hot water is used, and temperature detection with a thermocouple type temperature sensor A vessel 4, a stainless steel centrifugal pump 5, an electric heater type heater 6, and a stainless steel electric three-way switching valve 7 are provided in this order, and a stainless steel check valve 8 is provided in one pipe coming out of the switching valve 7. The return pipe 9 is connected to the tapping pipe 2 in the vicinity of the water heater 1, and the other pipe coming out of the switching valve 7 is a drain pipe 10. The drain pipe 10 is connected to a storage tank for middle water (not shown).
[0024]
A water flow detector M is provided in the primary water supply pipe. In the case of this example, the detector M is a water pressure gauge, and the pressure drops when the water tap 3 is released and the water is used, so that this is detected and a signal is transmitted, and the instantaneous water heater 1 is turned on. Is a mechanism that ignites a gas burner to boil hot water. Of course, the water flow detector M is not particularly limited as long as it detects the presence or absence of the water flow and transmits a signal. For example, the water flow detector M may be a flow meter instead of the water pressure gauge as in the present embodiment. Needless to say.
[0025]
The temperature detector 4 receives a signal from the thermocouple type temperature sensor, indicates a temperature, and activates a relay for starting and stopping the electric heater type heater 6 and the pump 5 at a desired temperature; and A signal for operating a relay for operating the electric three-way switching valve 7 for switching the flow path is output. The temperature detector 4 is stored in the hot water unit S together with a relay circuit, a power switch, and the like. The operating state of the hot water unit will be described in various cases of the embodiments described below.
[0026]
When the power switch of the hot water unit (hereinafter referred to as a hot water switch) is turned off, the heater 6 and the pump 5 are turned off, and the switching valve 7 is connected to the return pipe 9 regardless of the presence or absence of water flow. It is in a state.
[0027]
Next, the use state of the hot water supply device of the present invention will be described for each case. FIG. 2 is an explanatory diagram showing a usage state when the hot water switch is turned on when the hot water tap 3 is closed, that is, when there is no water flow and the stored water is lower than a predetermined temperature.
[0028]
This state is, for example, when the hot water switch is turned on when using the hot water supply device for the first time. When the hot water switch is turned on, both the electric heater type heater 6 and the pump 5 are turned off, and at the same time, the switching valve 7 is on the drain pipe 10 side. Therefore, in this state, the water flows from the switching valve 7 to the drain pipe 10 through the tapping pipe 2 due to the water pressure of the water supply connected to the primary side of the water heater 1. Therefore, the tap water is heated by the water heater, and the stored water in the pipeline is replaced by hot water, the temperature of which rises extremely quickly, and the hot water waiting time is reduced. In addition, since heating is performed using gas or the like, fuel costs are reduced.
[0029]
FIG. 3 is an explanatory diagram showing a use state when the hot water switch is turned on when the hot water tap 3 is closed and the stored water is at or above a predetermined temperature.
[0030]
This is the case where the temperature of the stored water has risen in the state at the start of use described above, or the case where the water tap 3 is temporarily closed during use. Both the heater 4 and the pump 5 are turned on, and the switching valve 7 is on the return pipe 9 side. Therefore, the stored water is heated and maintained by the electric heater 5 and circulated between the tapping pipe 2 and the return pipe 9 by the pump 5. Accordingly, hot water of a desired temperature is discharged without waiting time, regardless of when the hot water tap 3 is opened.
[0031]
FIG. 4 is an explanatory diagram showing a use state when the hot water switch is turned ON when the hot water tap 3 is open, that is, when there is a water flow and the stored water is lower than a predetermined temperature.
[0032]
In this case, in order to use hot water, the hot water switch 3 is turned on and the hot water tap 3 is opened immediately thereafter. The heater 6 is OFF, the pump 5 is ON, and the switching valve 7 is on the drain pipe 10 side. Since the temperature of the stored water in the tapping water pipe 2 is low, water having a predetermined temperature or less flows out of the hot water tap 3. However, since the stored water in the pipe after the hot water tap 3 is discharged to the drain pipe 10 side, it is relatively low. The water in the tapping pipe 2 is quickly replaced with hot water, and the waiting time is reduced.
[0033]
FIG. 5 is an explanatory diagram showing a use state when the hot water switch is turned on when the hot water tap 3 is opened and the stored water is at a predetermined temperature or higher.
[0034]
This is a state in which hot water is normally used continuously. Neither the heater 6 nor the pump 5 is operated, and the switching valve 7 is switched to the return pipe 10 side. That is, it is in the same state as hot water supply by a normal water heater.
[0035]
【The invention's effect】
As described above, when the hot water supply device of the present invention is first used, the waiting time until the hot water of an appropriate temperature becomes usable is short, and further, the hot water supply device reuses waste water. is there.
[0036]
In addition, the ON / OFF of the hot water switch is inappropriate because the time until the hot water standby state is long and the operation time of the system is long, and therefore, compared to the conventional method in which the hot water switch is kept on. Since the hot water supply apparatus requires only a short hot water standby time, the hot water switch can be frequently turned on and off, and the energy consumption can be further reduced.
[Brief description of the drawings]
FIG. 1 is a piping diagram of an example of a hot water supply device of the present invention.
FIG. 2 is an explanatory diagram showing a use state when a hot water tap is closed and a stored water temperature is low.
FIG. 3 is an explanatory diagram showing a use state when a hot water tap is closed and a stored water temperature is high.
FIG. 4 is an explanatory diagram showing a use state when a hot water tap is opened and a stored water temperature is low.
FIG. 5 is an explanatory view showing a use state when a hot water tap is opened and a stored water temperature is high.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Pre-stop type gas instantaneous water heater 2 Tapping pipe 3 Hot water tap 4 Temperature detector 5 Pump 6 Heater 7 Switching valve 8 Check valve 9 Return pipe 10 Drain pipe S Hot water unit M Water flow detector

Claims (1)

1次側管に水流検知器を備えた湯沸かし器の出湯管に、湯水栓、温度検知器、ポンプ、加熱器、切替弁がこの順に設けられ、切替弁から出る一方の管が出湯管の湯沸かし器近傍に接続され、切替弁から出る他方の管が排水管とされていることを特徴とする給湯装置。A water tap, a temperature detector, a pump, a heater, and a switching valve are provided in this order on a tapping pipe of a water heater having a water flow detector on the primary side pipe, and one pipe coming out of the switching valve is in the vicinity of the tapping water heater. A hot water supply apparatus, wherein the other pipe coming out of the switching valve is a drain pipe.
JP2002287322A 2002-09-30 2002-09-30 Water heater Withdrawn JP2004125228A (en)

Priority Applications (1)

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Family

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Country Status (1)

Country Link
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014016117A (en) * 2012-07-10 2014-01-30 Osaka Gas Co Ltd Instantaneous hot water supply system
JP2015031456A (en) * 2013-08-02 2015-02-16 酒井医療株式会社 Hot water supply device
JP2019196881A (en) * 2018-05-11 2019-11-14 アール・ビー・コントロールズ株式会社 Hot water supply device
JP2020008217A (en) * 2018-07-06 2020-01-16 株式会社パロマ Water heater with instantaneous hot water function
SE2051338A1 (en) * 2020-11-16 2022-05-17 Energybooster Ab Hot water circulation system and method for operating the same

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2014016117A (en) * 2012-07-10 2014-01-30 Osaka Gas Co Ltd Instantaneous hot water supply system
JP2015031456A (en) * 2013-08-02 2015-02-16 酒井医療株式会社 Hot water supply device
JP2019196881A (en) * 2018-05-11 2019-11-14 アール・ビー・コントロールズ株式会社 Hot water supply device
JP2020008217A (en) * 2018-07-06 2020-01-16 株式会社パロマ Water heater with instantaneous hot water function
JP7117765B2 (en) 2018-07-06 2022-08-15 株式会社パロマ Water heater with instant hot water function
SE2051338A1 (en) * 2020-11-16 2022-05-17 Energybooster Ab Hot water circulation system and method for operating the same
WO2022103323A1 (en) * 2020-11-16 2022-05-19 Energybooster Ab Hot water circulation system and method for operating the same
SE544546C2 (en) * 2020-11-16 2022-07-12 Energybooster Ab Hot water circulation system and method for operating the same

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