JP2004184015A

JP2004184015A - Electric water heater

Info

Publication number: JP2004184015A
Application number: JP2002353554A
Authority: JP
Inventors: Michihiro Uozumi; 亨広魚住; Mitsuru Kawaguchi; 満川口; Hiroyuki Tsuboi; 裕幸坪井
Original assignee: Toto Ltd
Current assignee: Toto Ltd
Priority date: 2002-12-05
Filing date: 2002-12-05
Publication date: 2004-07-02
Anticipated expiration: 2022-12-05
Also published as: JP4001002B2

Abstract

<P>PROBLEM TO BE SOLVED: To solve the problem on a conventional instantaneous hot water unit that extra hot water in a hot water tank and hot water from a collective hot water supply heat source are mixed together to cause the temperature rise of the hot water flowing out of the instantaneous hot water unit when the amount of remaining water in a hot water supply pipe is extremely less than the capacity of the hot water tank. <P>SOLUTION: The electric water heater has a hot water port 8a and a hot water port 8b for supplying hot water from the hot water tank 6. Either the hot water port 8a or the hot water port 8b can be selected by a selector valve 20. Thus, the temperature rise of the hot water flowing out of the instantaneous hot water unit is prevented when the amount of remaining water in the hot water supply pipe 12 is extremely less than the capacity of the hot water tank 6. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

【０００１】
【発明の属する技術分野】
本発明は、集中給湯熱源からの給湯配管末端の蛇口の近傍に設置される電気温水器に関するものである。
【０００２】
【従来の技術】
従来、この種の電気温水器は即湯ユニットと呼ぶので以下即湯ユニットと呼ぶ。さて即湯ユニットは、集中給湯熱源から給湯配管によって接続された末端の蛇口までの配管距離が長く、蛇口を開けても湯が到達するまでに待ち時間を生じるような場合に、給湯配管末端の蛇口近傍に設けられるもので、図２に示すような構造が知られている（例えば、特許文献１参照。）。温水タンク６内に供給された湯は温度調節器１９によって制御される加熱ヒータ７によって約６０℃から８０℃程度に加熱、保温される。蛇口１１が開くと給水圧によって給湯配管１２内で冷えた湯が冷水となって即湯ユニット１に流入するとともに、集中給湯熱源（図示せず）で加熱された湯が給湯配管１２に供給され始める。即湯ユニット１に流入した冷水は温水タンク６下部に供給され温水タンク６内の湯を押し上げるとともに、その一部がバイパス路９に流入し、温水タンク６上部から押し出された湯と出湯口８内部で混合し、約４０℃から６０℃で蛇口１１に供給される。温水タンク６内の湯は冷水が供給されることにより温度が低下し、蛇口１１へ供給される湯温も低下するが、やがて集中給湯熱源（図示せず）で加熱された湯が即湯ユニット１に流入し、最終的には、集中給湯熱源（図示せず）で設定された温度の湯が蛇口１１に供給される。
【０００３】
【特許文献１】
特開２００１−１２４４１７号公報（第１図、第３図）
【０００４】
【発明が解決しようとする課題】
従来の即湯ユニット１では、温水タンク６の容量が一定であるため、温水タンク６内の湯を消費してしまうのに最適な給湯配管１２内の残水量は温水タンク６の容量とほぼ同等量の範囲であるが、給湯配管１２内の残水量が例えば温水タンク６の容量の１／２以下程度といったように、温水タンク６の容量に対して給湯配管１２内の残水量が極端に少ない場合には、温水タンク６内の湯が余剰となり、集中給湯熱源（図示せず）から供給された湯と温水タンク６内の余剰の湯とが出湯口８で混合し、即湯ユニット１から蛇口１１に供給する湯の温度が上昇してしまう。本発明は上記課題を解決するためになされたもので、給湯配管１２内の残水量が即湯ユニット１の温水タンク６の容量に対して極端に少ない場合でも、蛇口１１に供給する湯温を上昇させないことを目的としている。
【０００５】
【課題を解決するための手段及びその作用・効果】
上記目的を達成するために請求項１は、集中給湯熱源からの給湯配管末端の蛇口の近傍に設置される、温水タンクと、温水タンクの底壁に設けた給水口と、温水タンク内の湯を加熱、保温するための加熱ヒータと、加熱ヒータを制御する温度調節器と、温水タンクの天壁に設けた出湯口と、即湯ユニットと集中給湯熱源からの給湯配管とを接続する給水継手と、温水タンクに湯を給水する給水管と、即湯ユニットと蛇口とを接続する出湯継手と、給水管からの給水を出湯口にバイパスさせるバイパス路より成る即湯ユニットにおいて、温水タンク内の湯を取出す採湯口を複数設け、使用する採湯管を選択可能としたので、即湯ユニットに接続された給湯配管の残水量に適した量の温水を供給可能な採湯口を選択でき、温水タンク内の余剰の湯が集中給湯熱源から供給される湯と混合することが無く、即湯ユニットからの蛇口に供給する湯の温度を上昇させずにすむ。
【０００６】
【発明の実施の形態】
以下、本発明の実施の形態を、図面により詳細に説明する。
図１は、本発明の一実施例を表わす即湯ユニットの構造を示す。
図１に示すように、集中給湯熱源（図示せず）から供給される湯は、給湯配管１２の途中に配置された給湯止水栓２を経由し、即湯ユニット１の給水継手３に供給され、給水管４、給水口５を通じて温水タンク６に至り、温度調節器１９によって制御される加熱ヒータ７によって加熱され、約６０℃から８０℃に保温された温水タンク６内部の湯を採湯口８ａ又は８ｂを通じ切替弁２０を介して出湯口８に押し出すと共に、その一部がバイパス路９を通じて出湯口８に分配され、温水タンク６から押し出された湯と混合し、出湯継手１０を通じて蛇口１１に供給される。蛇口１１からの出湯初期において、給湯配管１２内の湯は外気によって冷却されており、バイパス路９には給湯配管１２内の低温の冷水が供給され、出湯口８で温水タンク６内の高温の湯と混合して蛇口１１からは適温の湯が供給される。同時に、給湯配管１２内の低温の冷水は、給水口５から温水タンク６内に供給され、温水タンク６内の湯を押し出しながら、温水タンク６内の湯温を低下させる。
給湯配管１２内の低温の冷水が消費され、集中給湯熱源（図示せず）で加熱された湯が即湯ユニット１に供給され始めると、温水タンク６及びバイパス路９共に集中給湯熱源（図示せず）で設定された温度の湯が供給され、出湯口８では温水タンク６内から出湯初期よりも低温になった湯と、バイパス路９から分配された集中給湯熱源（図示せず）で設定された温度の湯が混合し、蛇口１１に供給される。
【０００７】
温水タンク６内の湯が集中給湯熱源（図示せず）で設定された温度の湯に置換されると、蛇口１１には集中給湯熱源（図示せず）で設定された温度の湯が供給される。
この過程において、切替弁２０によって採湯口８ｂ側を選択した場合、採湯口８ｂは温水タンク６の内部に開口しており、採湯口８ｂから給湯口８に供給される温水タンク６内の湯量は、採湯口８ｂより下部の範囲に制限される。よって、給湯配管１２内の低温の冷水の量が温水タンク６の容量に対し、極端に少ない場合においても、その残水量に見合った量の温水タンク６内の湯を供給することが出来るため、即湯ユニット１から蛇口１１に供給される湯の温度が上昇することがない。
【図面の簡単な説明】
【図１】本発明の一実施例を表わす即湯ユニットの構造図
【図２】従来の例の即湯ユニットの構造図
【符号の説明】
１…即湯ユニット
２…給湯止水栓
３…給水継手
４…給水管
５…給水口
６…温水タンク
７…加熱ヒータ
８…出湯口
８ａ…採湯口
８ｂ…採湯口
９…バイパス路
１０…出湯継手
１１…蛇口
１２…給湯配管
１９…温度調節器
２０…切替弁[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electric water heater installed near a faucet at the end of a hot water supply pipe from a centralized hot water supply heat source.
[0002]
[Prior art]
Conventionally, this type of electric water heater is called an instant hot water unit, and is hereinafter referred to as an instant hot water unit. By the way, the hot water supply unit has a long piping distance from the centralized hot water supply heat source to the terminal faucet connected by the hot water supply pipe, and if there is a waiting time until the hot water reaches even if the faucet is opened, A structure as shown in FIG. 2 which is provided near a faucet is known (for example, see Patent Document 1). The hot water supplied into the hot water tank 6 is heated and maintained at a temperature of about 60 ° C. to 80 ° C. by the heater 7 controlled by the temperature controller 19. When the faucet 11 is opened, the hot water cooled in the hot water supply pipe 12 by the feed water pressure becomes cold water and flows into the hot water supply unit 1, and the hot water heated by the central hot water supply heat source (not shown) is supplied to the hot water supply pipe 12. start. The cold water flowing into the hot water unit 1 is supplied to the lower portion of the hot water tank 6 to push up the hot water in the hot water tank 6, and a part of the cold water flows into the bypass 9 and the hot water pushed out from the upper portion of the hot water tank 6 and the tap 8. It is mixed inside and supplied to the faucet 11 at about 40 ° C to 60 ° C. The temperature of the hot water in the hot water tank 6 is reduced by the supply of cold water, and the temperature of the hot water supplied to the faucet 11 is also reduced. However, the hot water heated by the central hot water supply heat source (not shown) is soon used. 1 and finally hot water at a temperature set by a central hot water supply heat source (not shown) is supplied to the faucet 11.
[0003]
[Patent Document 1]
JP 2001-124417 A (FIGS. 1 and 3)
[0004]
[Problems to be solved by the invention]
In the conventional hot water unit 1, since the capacity of the hot water tank 6 is constant, the amount of residual water in the hot water supply pipe 12, which is optimal for consuming hot water in the hot water tank 6, is almost equal to the capacity of the hot water tank 6. The amount of water remaining in the hot water supply pipe 12 is extremely small with respect to the capacity of the hot water tank 6 such that the amount of remaining water in the hot water supply pipe 12 is, for example, about 以下 or less of the capacity of the hot water tank 6. In this case, the hot water in the hot water tank 6 becomes excessive, and the hot water supplied from the central hot water supply heat source (not shown) and the excess hot water in the hot water tank 6 are mixed at the tap 8 and the hot water unit 1 The temperature of the hot water supplied to the faucet 11 rises. The present invention has been made in order to solve the above-mentioned problem. Even when the amount of remaining water in the hot water supply pipe 12 is extremely small with respect to the capacity of the hot water tank 6 of the hot water supply unit 1, the temperature of the hot water supplied to the faucet 11 is reduced. The purpose is not to raise.
[0005]
[Means for Solving the Problems and Their Functions and Effects]
In order to achieve the above object, the present invention provides a hot water tank, a water supply port provided on a bottom wall of the hot water tank, and a hot water tank installed near the faucet at the end of a hot water supply pipe from a centralized hot water supply heat source. Heater for heating and maintaining the temperature, a temperature controller for controlling the heater, a tap hole provided on the top wall of the hot water tank, and a water supply joint for connecting a hot water unit and a hot water supply pipe from a central hot water supply heat source. And a hot water supply unit for supplying hot water to the hot water tank, a hot water supply joint for connecting the hot water supply unit and the faucet, and a hot water supply unit comprising a bypass passage for bypassing the water supply from the water supply pipe to the hot water outlet. Since multiple hot water outlets are provided to select hot water pipes to be used, hot water can be supplied to the hot water supply pipe connected to the hot water supply unit. Excess hot water in the tank Central water without being mixed with hot water supplied from the heat source, it is not necessary to increase the temperature of the hot water supplied to the faucet from immediate hot water unit.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows the structure of a hot water unit representing one embodiment of the present invention.
As shown in FIG. 1, hot water supplied from a centralized hot water supply heat source (not shown) is supplied to a water supply fitting 3 of the instant hot water unit 1 via a hot water stop cock 2 arranged in the middle of a hot water supply pipe 12. Then, the hot water is supplied to the hot water tank 6 through the water supply pipe 4 and the water supply port 5, heated by the heater 7 controlled by the temperature controller 19, and the hot water inside the hot water tank 6 kept at about 60 ° C. to 80 ° C. 8a or 8b is pushed out to the tap 8 via the switching valve 20 and a part thereof is distributed to the tap 8 through the bypass 9 and mixed with the hot water pushed out from the hot water tank 6, and the tap 11 is fed through the tapping joint 10. Supplied to In the initial stage of hot water supply from the faucet 11, the hot water in the hot water supply pipe 12 is cooled by the outside air, the low-temperature cold water in the hot water supply pipe 12 is supplied to the bypass 9, and the high-temperature hot water in the hot water tank 6 is supplied through the hot water outlet 8. Mixing with the hot water, the faucet 11 supplies an appropriate temperature hot water. At the same time, the low-temperature cold water in the hot water supply pipe 12 is supplied from the water supply port 5 into the hot water tank 6 and pushes out the hot water in the hot water tank 6 to lower the temperature of the hot water in the hot water tank 6.
When the low-temperature cold water in the hot water supply pipe 12 is consumed and the hot water heated by the central hot water supply heat source (not shown) starts to be supplied to the hot water unit 1, both the hot water tank 6 and the bypass 9 are connected to the central hot water supply heat source (not shown). The hot water at the temperature set in the hot water tank 6 is supplied from the hot water tank 6 at the outlet 8 and the hot water supplied from the bypass 9 to the central hot water supply source (not shown). The hot water at the set temperature is mixed and supplied to the faucet 11.
[0007]
When the hot water in the hot water tank 6 is replaced with hot water of a temperature set by a central hot water supply heat source (not shown), the faucet 11 is supplied with hot water of a temperature set by a central hot water supply heat source (not shown). You.
In this process, when the hot water port 8b side is selected by the switching valve 20, the hot water port 8b is opened inside the hot water tank 6, and the amount of hot water in the hot water tank 6 supplied from the hot water port 8b to the hot water port 8 is Is limited to a range below the hot water outlet 8b. Therefore, even when the amount of low-temperature cold water in the hot water supply pipe 12 is extremely small with respect to the capacity of the hot water tank 6, it is possible to supply hot water in the hot water tank 6 in an amount corresponding to the remaining water amount. The temperature of the hot water supplied from the hot water unit 1 to the faucet 11 does not rise.
[Brief description of the drawings]
FIG. 1 is a structural diagram of a hot water unit representing one embodiment of the present invention. FIG. 2 is a structural diagram of a hot water unit of a conventional example.
DESCRIPTION OF SYMBOLS 1 ... Hot water unit 2 ... Hot-water supply stopcock 3 ... Water supply joint 4 ... Water supply pipe 5 ... Water supply port 6 ... Hot water tank 7 ... Heater 8 ... Hot-water outlet 8a ... Hot-water outlet 8b ... Hot-water outlet 9 ... By-pass passage 10 ... Hot-water outlet Joint 11: faucet 12: hot water supply pipe 19: temperature controller 20: switching valve

Claims

A hot water tank installed near the faucet at the end of the hot water supply pipe from the central hot water supply heat source, a water supply port provided on the bottom wall of the hot water tank, a heater for heating and keeping the hot water in the hot water tank, and heating. A temperature controller for controlling the heater, a tap provided on the top wall of the hot water tank, a water supply joint for connecting an electric water heater and a hot water supply pipe from a central hot water supply heat source, and a water supply pipe for supplying hot water to the hot water tank. In an electric water heater comprising a tap joint for connecting an electric water heater and a faucet, and a bypass for bypassing water supplied from a water supply pipe to the tap, a plurality of taps for extracting hot water from a hot water tank are provided and used. An electric water heater characterized in that a gate can be selected.