JP4001002B2

JP4001002B2 - Electric water heater

Info

Publication number: JP4001002B2
Application number: JP2002353554A
Authority: JP
Inventors: 亨広魚住; 満川口; 裕幸坪井
Original assignee: Toto Ltd
Current assignee: Toto Ltd
Priority date: 2002-12-05
Filing date: 2002-12-05
Publication date: 2007-10-31
Anticipated expiration: 2022-12-05
Also published as: JP2004184015A

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、前記温水タンクの底壁に設けた給水口と、前記温水タンク内の湯を加熱、保温するための加熱ヒータと、この加熱ヒータを制御する温度調節器と、前記温水タンクの天壁に設けた出湯口と、前記集中給湯熱源からの給湯配管と接続される給水継手と、この給水継手から前記給水口に給水する給水管と、前記出湯口から押し出された湯を前記蛇口へ向けて流出させる出湯継手と、前記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と、から成る電気温水器において、前記温水タンク内の湯を前記出湯口に向けて取出す採湯口を複数設け、前記集中給湯熱源から前記給水継手に至る給湯配管の残水量に見合うように、使用する採湯口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]
BACKGROUND 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 central hot water supply heat source.
[0002]
[Prior art]
Conventionally, this type of electric water heater is referred to as an immediate hot water unit, and hence referred to as an immediate hot water unit. The immediate hot water unit has a long piping distance from the central hot water source to the end faucet connected by the hot water supply pipe, and when there is a waiting time for hot water to reach even if the faucet is opened, It is provided in the vicinity of the faucet, and a structure as shown in FIG. 2 is known (for example, refer to Patent Document 1). The hot water supplied into the hot water tank 6 is heated and kept at about 60 ° C. to about 80 ° C. by the heater 7 controlled by the temperature controller 19. When the faucet 11 is opened, hot water cooled in the hot water supply pipe 12 by the supply water pressure becomes cold water and flows into the immediate hot water unit 1, and hot water heated by a concentrated hot water 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 part of the hot water tank 6 and pushes up the hot water in the hot water tank 6, and part of it flows into the bypass 9, and the hot water and hot water outlet 8 pushed out of the hot water tank 6. It mixes inside and is supplied to the faucet 11 at about 40 to 60 ° C. The temperature of the hot water in the hot water tank 6 is lowered by the supply of cold water, and the temperature of the hot water supplied to the faucet 11 is also lowered, but the hot water heated by a concentrated hot water supply heat source (not shown) is eventually turned into an instant hot water unit. 1, and finally, hot water having 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 instant hot water unit 1, since the capacity of the hot water tank 6 is constant, the amount of remaining water in the hot water supply pipe 12 that 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 remaining water 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 residual water in the hot water supply pipe 12 is about ½ or less of the capacity of the hot water tank 6. In this case, the hot water in the hot water tank 6 becomes surplus, and the hot water supplied from a central hot water supply heat source (not shown) and the surplus hot water in the hot water tank 6 are mixed at the hot water outlet 8, and from the immediate hot water unit 1. The temperature of the hot water supplied to the faucet 11 will rise. The present invention has been made to solve the above problems, and even when the amount of remaining water in the hot water supply pipe 12 is extremely small relative to the capacity of the hot water tank 6 of the immediate hot water unit 1, the hot water temperature supplied to the faucet 11 can be reduced. The purpose is not to raise.
[0005]
[Means for solving the problems and their functions and effects]
Claim in order to achieve the above object 1, and the hot water tank that will be installed in the vicinity of the hot water supply pipe end of the faucet from the central water heat source, a water supply port formed in a bottom wall of the hot water tank, the hot water tank heating the hot water, and a heater for heat retention, water supply to the temperature controller for controlling the heater, and a tap hole provided in the ceiling wall of the hot water tank is connected to the hot water supply pipe from the central water heat source a joint, a water supply pipe for supplying water to the water inlet from the water supply joint, the bypass for bypassing the hot water pushed out from the tap hole and tapping fitting to flow out toward the faucet, the sprue out of the water supply from the water supply pipe in electric water heater consisting of a road, it said providing a plurality of adopting sprue taken out toward the tap hole of the hot water in the hot water tank, to meet the residual water content of the hot water supply pipe leading to the water supply fitting from the central water heat source, use The hot water outlet that can supply hot water in an amount suitable for the amount of remaining water in the hot water supply pipe connected to the immediate hot water unit can be selected, and excess hot water in the hot water tank can be removed from the central hot water source. There is no mixing with the hot water supplied, and it is not necessary to raise the temperature of the hot water supplied to the faucet from the immediate hot water unit.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 shows the structure of an instant hot water unit representing an embodiment of the present invention.
As shown in FIG. 1, hot water supplied from a central hot water supply heat source (not shown) is supplied to a water supply joint 3 of an immediate hot water unit 1 via a hot water stop cock 2 arranged in the middle of a hot water supply pipe 12. The hot water tank 6 reaches the hot water tank 6 through the water supply pipe 4 and the water supply port 5 and is heated by the heater 7 controlled by the temperature controller 19, and the hot water in the hot water tank 6 kept at about 60 ° C. to 80 ° C. While being pushed out to the hot water outlet 8 through the switching valve 20 through 8a or 8b, a part thereof is distributed to the hot water outlet 8 through the bypass 9 and mixed with hot water pushed out from the hot water tank 6, and through the hot water joint 10 to the faucet 11 To be supplied. The hot water in the hot water supply pipe 12 is cooled by the outside air at the initial stage of the hot water supply from the faucet 11, and cold cold water in the hot water supply pipe 12 is supplied to the bypass passage 9, and the hot water in the hot water tank 6 is heated at the hot water outlet 8. Mixing with hot water, hot water of appropriate temperature is supplied from the tap 11. 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 while lowering the hot water temperature in the hot water tank 6.
When low-temperature cold water in the hot water supply pipe 12 is consumed and hot water heated by a central hot water supply source (not shown) starts to be supplied to the instant hot water unit 1, both the hot water tank 6 and the bypass channel 9 have a central hot water supply heat source (not shown). Hot water having a temperature set in (1)) is supplied, and the hot water outlet 8 is set with hot water having a temperature lower than that of the initial hot water from the hot water tank 6 and a central hot water source (not shown) distributed from the bypass 9. The hot water having the above 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 having a temperature set by a central hot water supply heat source (not shown), hot water having a temperature set by a central hot water supply heat source (not shown) is supplied to the faucet 11. The
In this process, when the hot water outlet 8b side is selected by the switching valve 20, the hot water inlet 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 outlet 8b to the hot water outlet 8 is as follows. The temperature 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 relative to the capacity of the hot water tank 6, the amount of hot water in the hot water tank 6 corresponding to the amount of remaining water can be supplied. The temperature of hot water supplied from the immediate hot water unit 1 to the faucet 11 does not increase.
[Brief description of the drawings]
FIG. 1 is a structural view of an instant hot water unit representing an embodiment of the present invention. FIG. 2 is a structural view of an instant hot water unit of a conventional example.
DESCRIPTION OF SYMBOLS 1 ... Instant hot water unit 2 ... Hot water stop cock 3 ... Water supply joint 4 ... Water supply pipe 5 ... Water supply port 6 ... Hot water tank 7 ... Heating heater 8 ... Hot water outlet 8a ... Hot water outlet 8b ... Hot water outlet 9 ... Bypass passage 10 ... Hot water outlet Joint 11 ... Faucet 12 ... Hot water supply pipe 19 ... Temperature controller 20 ... Switching valve

Claims

And the hot water tank that will be installed in the vicinity of the faucet hot water supply pipe ends from central water heat source, a water supply port formed in a bottom wall of the hot water tank, heating the hot water in the hot water tank, a heater for heat insulation a temperature controller for controlling the heater, and a tap hole provided in the ceiling wall of the hot water tank, a water supply joint connected to the hot water supply pipe from the central water heat source, the water supply from the water supply fitting to said water inlet to the water supply pipe, a hot water fitting to flow out the hot water pushed out from the tap hole toward the faucet, a bypass passage for bypassing the sprue out of the water supply from the water supply pipe, the electric water heater made of, the hot water a plurality of hot water sprue adopting taken out toward the tap hole of the tank, to meet the residual water content of the hot water supply pipe leading to the water supply fitting from the central water heat source, characterized in that a selectable adopt sprue use Electric water heater to be.