JP2017116210A

JP2017116210A - Storage type hot water supply device

Info

Publication number: JP2017116210A
Application number: JP2015253868A
Authority: JP
Inventors: 常子今川; Tsuneko Imagawa; 由樹山岡; Yoshiki Yamaoka
Original assignee: Panasonic Intellectual Property Management Co Ltd
Current assignee: Panasonic Intellectual Property Management Co Ltd
Priority date: 2015-12-25
Filing date: 2015-12-25
Publication date: 2017-06-29

Abstract

PROBLEM TO BE SOLVED: To provide a hot water supply device superior in energy saving performance by suppressing increase of heat radiation loss in a constitution utilizing hot water of a hot water storage tank.SOLUTION: A storage type hot water supply device includes a hot water storage tank 1, a first tapping pipe 3 connected to an upper portion of the hot water storage tank 1, a water supply pipe 5 connected to a lower portion of the hot water storage tank 1, and a second tapping pipe 4 connected between a position where the first tapping pipe 3 is connected and a position where the water supply pipe 5 is connected in a vertical direction of the hot water storage tank 1, and a position in a vertical direction, of a first mixing valve 6 for mixing hot water from the second tapping pipe 4 and water from a water supply branch pipe 10, is lower than a connecting position of the second tapping pipe 4 and the hot water storage tank 1.SELECTED DRAWING: Figure 1

Description

本発明は、ヒートポンプ方式の加熱手段で加熱した水を貯湯槽へ貯湯して利用する貯湯式給湯装置に関するものである。 The present invention relates to a hot water storage type hot water supply apparatus that stores water heated by a heat pump type heating means in a hot water storage tank.

この種の貯湯式給湯装置は、加熱手段によって貯湯槽の底部から供給される水を高温に加熱し、断熱材で被覆された貯湯槽の上部へ貯留する一連のサイクルを繰り返すことにより、貯湯槽の全体または一部に高温の湯を蓄える。使用者が湯を使用する給湯時には、加熱されていない水と混合することで所定温度にして給湯端末で使用する。 This kind of hot water storage type hot water supply apparatus is a hot water storage tank by repeating a series of cycles in which water supplied from the bottom of the hot water storage tank is heated to a high temperature by a heating means and stored in the upper part of the hot water storage tank covered with a heat insulating material. Store hot water in whole or in part. When the user uses hot water to supply hot water, the user mixes it with unheated water so as to obtain a predetermined temperature and use the hot water supply terminal.

ここで用いるヒートポンプ式加熱手段の運転効率は、外気温と沸き上げ温度と加熱手段に供給される水の温度である入水温度とに依存し、外気温が高い場合や沸き上げ温度が低い場合、入水温度が低い場合に運転効率が向上する。外気温は季節や稼動時刻によって変動し、それに加えて入水温度は貯湯槽の温度状態によっても変動する。 The operating efficiency of the heat pump heating means used here depends on the outside air temperature, the boiling temperature, and the incoming water temperature, which is the temperature of the water supplied to the heating means, and when the outside air temperature is high or the boiling temperature is low, Operation efficiency is improved when the incoming water temperature is low. The outside air temperature varies depending on the season and operation time, and in addition, the incoming water temperature also varies depending on the temperature state of the hot water tank.

特に、風呂追い焚きやラジエター等の貯湯槽内の熱を利用する端末を使用する場合は、熱利用端末内の湯と貯湯槽の湯を熱交換器によって熱交換した後の湯を貯湯槽下部へ戻す構成となっている。 In particular, when using a terminal that uses the heat in the hot water tank such as a bath chase or a radiator, the hot water in the heat using terminal and the hot water in the hot water tank are exchanged with a heat exchanger. It is configured to return to.

本来は、貯湯槽の底部には給水温度と同程度の温度の水が存在しているが、熱利用端末の利用が発生する場合は、熱交換器からの湯が下部の低い水と混合されるため、給水温度よりも高い中間的な温度となった中温水が貯湯槽の下部に生じる。その中温水が、沸き上げの際に加熱手段へ供給されるため、入水の温度が上昇することになり効率は著しく低下する。 Originally, there is water at the bottom of the hot water tank at a temperature that is about the same as the water supply temperature. However, when the use of a heat terminal occurs, the hot water from the heat exchanger is mixed with the low water at the bottom. Therefore, intermediate temperature water having an intermediate temperature higher than the feed water temperature is generated in the lower part of the hot water tank. Since the medium-temperature water is supplied to the heating means at the time of boiling, the temperature of the incoming water rises and the efficiency is significantly reduced.

従来、熱利用端末によって生じる中温水を取り除くために、貯湯槽の上下方向の中間的な位置に第２の出湯口を設け、中間位置に存在する湯を優先的に使用する構成としていた（例えば、特許文献１参照）。 Conventionally, in order to remove the medium temperature water generated by the heat utilization terminal, a second hot water outlet is provided at an intermediate position in the vertical direction of the hot water tank, and the hot water existing at the intermediate position is preferentially used (for example, , See Patent Document 1).

図１５は、特許文献１に記載された従来の貯湯式給湯装置を示すものである。 FIG. 15 shows a conventional hot water storage type hot water supply apparatus described in Patent Document 1. As shown in FIG.

図１５に示すように、貯湯槽１と、この貯湯槽１の湯水を加熱する加熱手段２と、貯湯槽１の上部に接続された第１の出湯管３と、貯湯槽１の中間部分に接続された第２の出湯管４と、貯湯槽１の第２の出湯管４からの湯と給水分岐管１０の給水を混合させる第１の混合弁６と、第２の出湯管４が接続された位置での貯湯槽１内の湯温を検知する湯温検知手段１２と、給湯温度を設定する給湯温度設定手段３０を設け、湯温検知手段１２により検知された湯温が給湯温度設定手段３０で設定された給湯設定温度未満であれば第２の出湯管４から出湯し、給湯設定温度以上であれば第１の出湯管３から出湯するように、第１の混合弁６の流路を切り換える。 As shown in FIG. 15, a hot water tank 1, a heating means 2 for heating the hot water in the hot water tank 1, a first outlet pipe 3 connected to the upper part of the hot water tank 1, and an intermediate portion of the hot water tank 1 Connected are the second hot water discharge pipe 4, the first mixing valve 6 for mixing the hot water from the second hot water discharge pipe 4 of the hot water storage tank 1 and the feed water of the water supply branch pipe 10, and the second hot water discharge pipe 4. The hot water temperature detecting means 12 for detecting the hot water temperature in the hot water storage tank 1 at the position and the hot water temperature setting means 30 for setting the hot water temperature are provided, and the hot water temperature detected by the hot water temperature detecting means 12 is set for the hot water temperature. The flow of the first mixing valve 6 is such that if it is lower than the hot water supply set temperature set by the means 30, the hot water is discharged from the second hot water discharge pipe 4, and if it is higher than the hot water supply set temperature, the hot water is discharged from the first hot water discharge pipe 3. Switch the path.

また、熱利用端末２３と、貯湯槽１の熱と熱利用端末２３内の熱を交換する熱交換器２０と、貯湯槽１の上部に接続された熱利用出湯管２１と、熱交換器２０と貯湯槽１の下部に接続された熱利用戻り管２２と、貯湯槽１から熱交換器２０へ湯を搬送するためのポンプ２５と、熱利用端末２３での利用熱温度を検知する熱利用温度検知手段２４と、熱利用端末２３での利用温度を設定する熱利用温度設定手段３１を設け、熱利用端末２３による熱の利用が発生する場合は、熱利用温度検知手段２４の検知する温度と熱利用温度設定手段３１で設定された温度に従ってポンプ２５を制御して流量を制御する。熱利用戻り管２
２から戻る中温水は、貯湯槽１の下部から入水され、湯の利用に従って上昇し、第２の出湯管４から出湯して利用される。 Moreover, the heat utilization terminal 23, the heat exchanger 20 that exchanges the heat of the hot water storage tank 1 and the heat in the heat utilization terminal 23, the heat utilization hot water discharge pipe 21 connected to the upper part of the hot water storage tank 1, And a heat utilization return pipe 22 connected to the lower part of the hot water tank 1, a pump 25 for conveying hot water from the hot water tank 1 to the heat exchanger 20, and heat utilization for detecting the heat utilization temperature at the heat utilization terminal 23. The temperature detection means 24 and the heat use temperature setting means 31 for setting the use temperature at the heat use terminal 23 are provided, and when the heat use by the heat use terminal 23 occurs, the temperature detected by the heat use temperature detection means 24 The flow rate is controlled by controlling the pump 25 according to the temperature set by the heat utilization temperature setting means 31. Heat utilization return pipe 2
The intermediate warm water returning from 2 enters from the lower part of the hot water tank 1, rises according to the use of the hot water, is discharged from the second hot water discharge pipe 4 and used.

特願２０１０−２３９２４４Japanese Patent Application No. 2010-239244

しかしながら、第１の混合弁６の上下高さ方向における位置が、貯湯槽１と第２の出湯管４とが接続している位置と同じになっているため、配管内で発生する放熱により貯湯槽１の湯からの放熱ロスが増大する。図１６にその原理を示す。すなわち、第２の出湯管４と接続位置の貯湯槽１の温度が第２の出湯管４、および、出湯管合流管８よりも高い場合、第２の出湯管４、および、出湯管合流管８の配管内壁近傍の高温の湯が周囲空気に冷やされて温度が低下すると、比重が大きくなるために下方向に流動して貯湯槽１内へと移動する流れＦ１が発生する。 However, since the position of the first mixing valve 6 in the vertical height direction is the same as the position where the hot water storage tank 1 and the second hot water discharge pipe 4 are connected, the hot water storage is caused by heat generated in the piping. The heat loss from the hot water in the tank 1 increases. FIG. 16 shows the principle. That is, when the temperature of the hot water storage tank 1 at the connection position with the second hot water discharge pipe 4 is higher than that of the second hot water discharge pipe 4 and the hot water discharge pipe merging pipe 8, the second hot water discharge pipe 4 and the hot water discharge pipe merging pipe. When the hot water in the vicinity of the inner wall of the pipe 8 is cooled by the ambient air and the temperature decreases, the specific gravity increases, so that a flow F1 that flows downward and moves into the hot water tank 1 is generated.

この時、貯湯槽１内の高温の湯が、入れ替わるように第２の出湯管４、および、出湯管合流管８の管内を上方向へと移動流れＦ２が発生する。この対流により貯湯槽１の熱が奪われ、放熱ロスが増大するために効率の低下を招くという課題があった。 At this time, a moving flow F2 is generated in the upward direction in the second hot water discharge pipe 4 and the hot water discharge pipe merging pipe 8 so that the hot water in the hot water tank 1 is replaced. Due to this convection, the heat of the hot water tank 1 is deprived and the heat dissipation loss increases, so that there is a problem that the efficiency is lowered.

本発明は、前記従来の課題を解決するもので、貯湯槽の湯を利用する構成において、放熱ロスの増大を抑制することで、省エネルギー性に優れた給湯装置を提供することを目的とする。 This invention solves the said conventional subject, and it aims at providing the hot water supply apparatus excellent in energy saving property by suppressing the increase in heat dissipation loss in the structure using the hot water of a hot water storage tank.

前記従来の課題を解決するために、本発明の貯湯式給湯装置は、貯湯槽と、前記貯湯槽の上部に接続された第１の出湯管と、前記貯湯槽の下部に接続された給水管と、前記貯湯槽の上下方向において、前記第１の出湯管が接続された位置と前記給水管が接続された位置との間に接続された第２の出湯管と、前記給水管から分岐された給水分岐管と、前記第２の出湯管と前記給水分岐管とが入口側に接続された第１の混合弁と、前記第１の混合弁の出口側に接続された出湯管合流管と、前記第1の出湯管と前記出湯管合流管とが入口側に接続された第２の混合弁と、前記第２の混合弁の出口側に接続された混合水管と、前記貯湯槽の上部に接続された熱利用出湯管と、前記熱利用出湯管に接続された熱交換器と、前記熱交換器と前記貯湯槽に接続された熱利用戻り管と、を備え、前記熱利用戻り管は、前記貯湯槽の上下方向において、前記第２の出湯管の前記貯湯槽の接続位置よりも高い位置で、前記貯湯槽に接続されており、前記第１の混合弁は、前記貯湯槽の上下方向において、前記第２の出湯管の前記貯湯槽の接続位置よりも低い位置で、前記貯湯槽と接続されていることを特徴とするものである。 In order to solve the conventional problems, a hot water storage type hot water supply apparatus of the present invention includes a hot water storage tank, a first hot water pipe connected to the upper part of the hot water tank, and a water supply pipe connected to the lower part of the hot water tank. And in the vertical direction of the hot water storage tank, a second hot water discharge pipe connected between the position where the first hot water discharge pipe is connected and the position where the water supply pipe is connected, and a branch from the water supply pipe. A first water supply branch pipe connected to the inlet side of the second hot water pipe and the water supply branch pipe, and a hot water pipe merge pipe connected to the outlet side of the first mixing valve; A second mixing valve in which the first outlet pipe and the outlet pipe merging pipe are connected to the inlet side, a mixing water pipe connected to the outlet side of the second mixing valve, and an upper portion of the hot water storage tank Connected to the heat utilization hot water pipe, connected to the heat utilization hot water pipe, connected to the heat exchanger and the hot water storage tank And the heat utilization return pipe is connected to the hot water storage tank at a position higher than the connection position of the hot water storage tank of the second hot water discharge pipe in the vertical direction of the hot water storage tank. The first mixing valve is connected to the hot water storage tank at a position lower than a connection position of the hot water storage tank of the second hot water discharge pipe in the vertical direction of the hot water storage tank. It is what.

これにより、第２の出湯管の貯湯槽の接続位置の温度が高い場合でも、密度差により湯が上方へ流動することがないため、対流が発生することを防止することができ、放熱ロスの増大による運転効率の低下を防止することができる。 Thereby, even when the temperature of the connection position of the hot water storage tank of the second hot water discharge pipe is high, hot water does not flow upward due to the density difference, so that it is possible to prevent the occurrence of convection and to reduce the heat dissipation loss. A reduction in operating efficiency due to the increase can be prevented.

本発明によれば、貯湯槽の湯を利用する構成において、放熱ロスの増大を抑制でき、省エネルギー性に優れた給湯装置を提供できる。 ADVANTAGE OF THE INVENTION According to this invention, in the structure using the hot water of a hot water storage tank, the increase in heat dissipation loss can be suppressed and the hot water supply apparatus excellent in energy saving property can be provided.

本発明の実施の形態１における貯湯式給湯装置の構成図The block diagram of the hot water storage type hot water supply apparatus in Embodiment 1 of this invention 同給湯が発生する場合の制御ブロックを示す図The figure which shows the control block when the hot water supply occurs 同給湯が発生する場合の制御のフローチャートを示す図The figure which shows the flowchart of control when the hot water supply generate | occur | produces 同貯湯槽内の温度分布の変化を示す図The figure which shows the change of the temperature distribution in the same hot water tank 同熱利用端末での熱利用が発生する場合の制御ブロックを示す図The figure which shows the control block when the heat utilization with the same heat utilization terminal occurs 同熱利用端末での熱利用が発生する場合の制御のフローチャートを示す図The figure which shows the flowchart of control when the heat utilization in the heat utilization terminal generate | occur | produces （ａ）同熱利用端末での熱利用が発生する前の温度分布を示す図（ｂ）同熱利用端末での熱利用が発生した直後の温度分布を示す図（ｃ）同熱利用端末での熱利用が発生した後、給湯が発生した後の温度分布を示す図(A) The figure showing the temperature distribution before the heat utilization at the same heat utilization terminal (b) The figure showing the temperature distribution immediately after the heat utilization at the same heat utilization terminal (c) At the same heat utilization terminal Figure showing the temperature distribution after hot water is used and hot water is generated 本発明の実施の形態１における貯湯式給湯装置の混合弁の他の接続構成を示す図The figure which shows the other connection structure of the mixing valve of the hot water storage type hot-water supply apparatus in Embodiment 1 of this invention. （ａ）図１の混合弁の接続構成における第２の出湯管の温度と出湯流量の関係を示す図（ｂ）図８の混合弁の接続構成における第２の出湯管の温度と出湯流量の関係を示す図(A) The figure which shows the relationship between the temperature of the 2nd tap pipe in the connection structure of the mixing valve of FIG. 1, and a tapping flow rate. (B) The temperature of the 2nd tap water pipe and the tapping flow rate in the connection structure of the mixing valve of FIG. Diagram showing relationship （ａ）図１の混合弁の接続構成において給湯が発生した後の温度分布を示す図（ｂ）図８に混合弁の接続構成において給湯が発生した後の温度分布を示す図(A) Diagram showing temperature distribution after hot water is generated in the connection configuration of the mixing valve in FIG. 1 (b) Diagram showing temperature distribution after hot water is generated in the connection configuration of the mixing valve in FIG. 本発明の実施の形態１における放熱防止の概念図Conceptual diagram of heat dissipation prevention in Embodiment 1 of the present invention 本発明の実施の形態２における貯湯式給湯装置の構成図The block diagram of the hot water storage type hot water supply apparatus in Embodiment 2 of this invention 同給湯が発生する場合の制御ブロックを示す図The figure which shows the control block when the hot water supply occurs 同給湯が発生する場合の制御のフローチャートを示す図The figure which shows the flowchart of control when the hot water supply generate | occur | produces 従来の貯湯式給湯装置の構成図Configuration diagram of a conventional hot water storage hot water supply system 従来の貯湯式給湯装置において配管と貯湯槽との間で発生する対流の概念図Conceptual diagram of convection generated between piping and hot water tank in a conventional hot water storage hot water supply system

第１の発明は、貯湯槽と、前記貯湯槽の上部に接続された第１の出湯管と、前記貯湯槽の下部に接続された給水管と、前記貯湯槽の上下方向において、前記第１の出湯管が接続された位置と前記給水管が接続された位置との間に接続された第２の出湯管と、前記給水管から分岐された給水分岐管と、前記第２の出湯管と前記給水分岐管とが入口側に接続された第１の混合弁と、前記第１の混合弁の出口側に接続された出湯管合流管と、前記第1の出湯管と前記出湯管合流管とが入口側に接続された第２の混合弁と、前記第２の混合弁の出口側に接続された混合水管と、前記貯湯槽の上部に接続された熱利用出湯管と、前記熱利用出湯管に接続された熱交換器と、前記熱交換器と前記貯湯槽に接続された熱利用戻り管と、を備え、前記熱利用戻り管は、前記貯湯槽の上下方向において、前記第２の出湯管の前記貯湯槽の接続位置よりも高い位置で、前記貯湯槽に接続されており、前記第１の混合弁は、前記貯湯槽の上下方向において、前記第２の出湯管の前記貯湯槽の接続位置よりも低い位置で、前記貯湯槽と接続されていることを特徴とする貯湯式給湯装置である。
これにより、熱交換器から貯湯槽に戻る湯により発生した中温水を第２の出湯管を通じて有効に利用することにより、貯湯された湯の熱量を最大限有効に利用し、かつ沸き上げ効率の低下を防ぐことができるので、良好な使い勝手と高い省エネルギー性とを実現することができる。 In a first aspect of the invention, in the hot water storage tank, the first hot water pipe connected to the upper part of the hot water tank, the water supply pipe connected to the lower part of the hot water tank, and the vertical direction of the hot water tank, A second hot water pipe connected between a position where the hot water pipe is connected and a position where the water supply pipe is connected; a water supply branch pipe branched from the water supply pipe; and the second hot water pipe; A first mixing valve connected to the inlet side of the water supply branch pipe; a hot water pipe joining pipe connected to the outlet side of the first mixing valve; the first hot water pipe and the hot water pipe joining pipe; A second mixing valve connected to the inlet side, a mixed water pipe connected to the outlet side of the second mixing valve, a heat utilization hot water discharge pipe connected to the upper part of the hot water storage tank, and the heat utilization A heat exchanger connected to a tapping pipe; and a heat return pipe connected to the heat exchanger and the hot water storage tank. The pipe is connected to the hot water storage tank at a position higher than the connection position of the hot water storage tank of the second hot water discharge pipe in the vertical direction of the hot water storage tank, and the first mixing valve is connected to the hot water storage tank. The hot water storage hot water supply apparatus is connected to the hot water storage tank at a position lower than the connection position of the hot water storage tank of the second hot water discharge pipe in the vertical direction.
As a result, the hot water generated by the hot water returning from the heat exchanger to the hot water tank is effectively utilized through the second hot water discharge pipe, so that the amount of heat of the hot water is effectively utilized and the boiling efficiency is improved. Since the decrease can be prevented, good usability and high energy saving can be realized.

さらに、給水分岐管の水と第２の出湯管を混合した後に、第１の出湯管からの湯を混合する接続方法により、低い温度の中温水をより多く利用することにより、比較的高い温度の湯の利用を抑えることとなり、熱利用端末で利用する湯量を増加することができる。 Furthermore, after mixing the water of the feed water branch pipe and the second hot water discharge pipe, the connection method of mixing the hot water from the first hot water discharge pipe makes it possible to use a relatively high temperature by using more low-temperature medium-temperature water. Therefore, the amount of hot water used at the heat utilization terminal can be increased.

第２の発明は、特に第１の発明において、前記第１の出湯管から分岐された注湯用第１の出湯管と、前記出湯管合流管から分岐された注湯用出湯管合流管と、を備え、前記注湯用第１の出湯管と前記注湯用出湯管合流管とが入口側に接続され、出口側には注湯用混合水管が接続されている第３の混合弁を、有することを特徴とする貯湯式給湯装置である。 The second invention is the first invention, in particular, in the first invention, a first pouring pipe for pouring branched from the first pouring pipe, and a pouring pipe joining pipe for pouring branched from the pouring pipe joining pipe. A third mixing valve in which the first pouring pipe for pouring and the joining pipe for pouring hot water are connected to the inlet side, and a mixed water pipe for pouring is connected to the outlet side. A hot water storage type hot water supply apparatus characterized by comprising:

これにより、浴槽へ湯張りを行う等の給湯の際にも、中温水を優先的に利用することで、さらに沸き上げ時の効率低下を防ぐことができるため、より良好な使い勝手と高い省エネルギー性とを実現できる。 This makes it possible to prevent lowering of efficiency during boiling by preferentially using medium temperature water even when hot water is supplied to the bathtub, etc. Can be realized.

以下、本発明の実施の形態について、図面を参照しながら説明する。なお、この実施の形態によって本発明が限定されるものではない。 Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

（実施の形態１）
図１は本発明の第１の実施の形態における貯湯式給湯装置の構成を示す図である。 (Embodiment 1)
FIG. 1 is a diagram showing a configuration of a hot water storage type hot water supply apparatus in a first embodiment of the present invention.

図１において、貯湯式給湯装置は、貯湯槽１と、この貯湯槽１の水を加熱する加熱手段２であるヒートポンプ装置と、貯湯槽１の上部に接続された第１の出湯管３と、貯湯槽１の下部に接続された給水管５と、第１の出湯管３と給水管５とが接続された位置の間、すなわち、高さ方向において貯湯槽１の胴部略中央部に接続された第２の出湯管４と、給水管５から分岐された給水分岐管１０と、第２の出湯管４と給水分岐管１０とが入口側に接続された第１の混合弁６と、この第１の混合弁６の出口側に接続された出湯管合流管８と第１の出湯管３とが入口側に接続された第２の混合弁７と、この第２の混合弁７の出口側に接続された混合水管９とを備えている。 In FIG. 1, a hot water storage type hot water supply apparatus includes a hot water storage tank 1, a heat pump device that is a heating means 2 that heats the water in the hot water storage tank 1, a first hot water discharge pipe 3 connected to the upper part of the hot water storage tank 1, Connected between the water supply pipe 5 connected to the lower part of the hot water tank 1 and the position where the first hot water discharge pipe 3 and the water supply pipe 5 are connected, that is, in the height direction to the substantially central part of the trunk of the hot water tank 1. The second hot water outlet pipe 4, the water supply branch pipe 10 branched from the water supply pipe 5, the first mixing valve 6 in which the second hot water outlet pipe 4 and the water supply branch pipe 10 are connected to the inlet side, A second mixing valve 7 in which the outlet hot water joining pipe 8 and the first outlet hot water pipe 3 connected to the outlet side of the first mixing valve 6 are connected to the inlet side, and the second mixing valve 7 And a mixed water pipe 9 connected to the outlet side.

さらに、この混合水管９に接続された給湯口１１と、第２の出湯管４を流れる湯温を検知する中温検知手段１２と、出湯管合流管８を流れる湯温を検知する合流温検知手段１３と、混合水管９を流れる湯温を検知する給湯温度検知手段１４と、貯湯槽１の上部に接続された熱利用出湯管２１と、熱利用出湯管２１に接続された熱交換器２０と、貯湯槽１上部と貯湯槽１と第２の出湯管４とが接続された位置の間に接続された熱利用戻り管２２と、熱交換器２０に接続された熱利用端末２３と、熱利用戻り管２２に流れる湯量を調整するポンプ２５と、熱利用端末２３に流れる湯温を検知する熱利用温度検知手段２４とを備えている。 Furthermore, a hot water supply port 11 connected to the mixed water pipe 9, a medium temperature detection means 12 for detecting the hot water temperature flowing through the second hot water discharge pipe 4, and a combined temperature detection means for detecting the hot water temperature flowing through the hot water discharge pipe merging pipe 8. 13, a hot water supply temperature detection means 14 for detecting the temperature of hot water flowing through the mixed water pipe 9, a heat utilization hot water discharge pipe 21 connected to the upper part of the hot water storage tank 1, and a heat exchanger 20 connected to the heat utilization hot water supply pipe 21 , A heat utilization return pipe 22 connected between the upper part of the hot water tank 1, a position where the hot water tank 1 and the second hot water discharge pipe 4 are connected, a heat utilization terminal 23 connected to the heat exchanger 20, A pump 25 for adjusting the amount of hot water flowing through the use return pipe 22 and a heat use temperature detecting means 24 for detecting the temperature of hot water flowing through the heat use terminal 23 are provided.

さらに、給湯口１１の給湯温度を設定する給湯温度設定手段３０と、熱利用端末２３の熱利用温度を設定する熱利用温度設定手段３１と、中温検知手段１２と合流温検知手段１３と給湯温度検知手段１４の出力ならびに給湯温度設定手段３０の設定に基づいて第１の混合弁６と第２の混合弁７とを制御し、熱利用温度設定手段３１と熱利用温度検知手段２４の出力、ならびに熱利用温度設定手段３１の設定に基づいてポンプ２５を制御する制御手段３２をと有する制御装置３３とを備えている。 Furthermore, the hot water supply temperature setting means 30 for setting the hot water supply temperature of the hot water supply port 11, the heat use temperature setting means 31 for setting the heat use temperature of the heat use terminal 23, the intermediate temperature detection means 12, the combined temperature detection means 13, and the hot water supply temperature. The first mixing valve 6 and the second mixing valve 7 are controlled based on the output of the detection means 14 and the setting of the hot water supply temperature setting means 30, and the outputs of the heat use temperature setting means 31 and the heat use temperature detection means 24, And a control device 33 having control means 32 for controlling the pump 25 based on the setting of the heat utilization temperature setting means 31.

図２は制御のブロック図を示し、中温検知手段１２と、合流温検知手段１３、および給湯温度検知手段１４の出力と給湯温度設定手段３０の設定に基づいて、第１の混合弁６と第２の混合弁７の制御を行う制御手段３２からなる。 FIG. 2 is a block diagram of the control, and the first mixing valve 6 and the first mixing valve 6 are connected to each other based on the output of the intermediate temperature detecting means 12, the combined temperature detecting means 13, and the hot water temperature detecting means 14 and the setting of the hot water temperature setting means 30. It comprises control means 32 for controlling the two mixing valves 7.

以上のように構成された貯湯式給湯装置について、以下その動作、作用を説明する。 The operation and action of the hot water storage type hot water supply apparatus configured as described above will be described below.

基本的な動作としては、沸き上げ前は貯湯槽１に低温の水が多く満たされており、運転を開始すると、貯湯槽１の水がヒートポンプ装置２に送出され、そこで加熱されて高温の湯が貯湯槽１に戻される。これによって貯湯槽１には高温の湯が貯えられていく。 As a basic operation, the hot water tank 1 is filled with a lot of low-temperature water before boiling, and when the operation is started, the water in the hot water tank 1 is sent to the heat pump device 2 where it is heated and heated to hot water. Is returned to the hot water tank 1. As a result, hot water is stored in the hot water tank 1.

沸き上げ後の給湯利用の際には、給水分岐管１０からの給水と第２の出湯管４を通じて出湯される貯湯槽１の湯を第１の混合弁６によって混合された出湯管合流管８内の湯と、第１の出湯管３からの貯湯槽１の湯とが、第２の混合弁７によって給湯設定温度に混合されて給湯口１１へ供給される。また、給湯に使用された湯量相当の水が給水管５を通じて貯湯槽１下部から流入する。 When using the hot water supply after boiling, the hot water from the hot water storage tank 1 discharged from the water supply branch pipe 10 and the hot water from the second hot water pipe 4 is mixed by the first mixing valve 6. The hot water in the hot water storage tank 1 from the first outlet pipe 3 is mixed with the hot water set temperature by the second mixing valve 7 and supplied to the hot water outlet 11. Further, water corresponding to the amount of hot water used for hot water supply flows from the lower part of the hot water tank 1 through the water supply pipe 5.

ここで、この給湯利用時の動作と熱利用端末利用時の動作を図３〜図７を用いて詳細に説明する。給湯温度は給湯温度設定手段３０で給湯設定温度として設定され、ｔｓを給湯口１１の給湯設定温度とし、ｔｓ２を例えば−５℃といった給湯設定温度から所定温度低い温度とし、ｔｍを中温検知手段１２で検知した温度とする。また、ｔｅを熱利用温度検知手段２４で検出する温度とし、ｔｓ３を熱利用設定温度手段で設定される温度とする。 Here, the operation when using the hot water supply and the operation when using the heat utilization terminal will be described in detail with reference to FIGS. The hot water supply temperature is set as the hot water supply set temperature by the hot water supply temperature setting means 30, ts is set as the hot water supply set temperature of the hot water supply port 11, ts2 is set to a temperature lower than the hot water supply set temperature, for example, -5 ° C., and tm is the medium temperature detection means 12. The temperature detected in step 1. Further, te is a temperature detected by the heat use temperature detecting means 24, and ts3 is a temperature set by the heat use set temperature means.

図３は、給湯が発生した場合の制御のフローチャートである。給湯が開始されると、ｔｍとｔｓ２の大小関係を判断し（ステップ１）、ｔｍがｔｓ２より高い場合は、合流温検知手段１３で検知する湯温に基づいて、合流温検知手段１３がｔｓになるように第１の混合弁６の開度を調整する（ステップ２）。また、第１の混合弁６は、出湯管合流管８からのみ混合水管９へ出湯するように出湯管合流管８側に全開にする（ステップ３）。 FIG. 3 is a flowchart of control when hot water is generated. When hot water supply is started, the magnitude relationship between tm and ts2 is determined (step 1). If tm is higher than ts2, the combined temperature detecting means 13 is based on the hot water temperature detected by the combined temperature detecting means 13. The opening degree of the first mixing valve 6 is adjusted so as to become (step 2). Further, the first mixing valve 6 is fully opened to the side of the tapping pipe merging pipe 8 so as to pour hot water only from the tapping pipe merging pipe 8 to the mixed water pipe 9 (step 3).

ｔｍがｔｓ２以下である場合は、第２の混合弁７は、第２の出湯管４からのみ出湯管合流管８へ出湯するように、第２の出湯管４側に全開にする（ステップ４）。その後、給湯温度検知手段１４からの出力がｔｓになるように、第１の混合弁６によって第１の出湯管３の湯と出湯管合流管８の湯を混合する（ステップ５）。設定温度ｔｓに調整された湯は、混合水管９を通じて給湯口１１から給湯される。 When tm is equal to or less than ts2, the second mixing valve 7 is fully opened to the second tapping pipe 4 side so as to pour hot water only from the second tapping pipe 4 to the tapping pipe joining pipe 8 (step 4). ). Thereafter, the first mixing valve 6 mixes the hot water in the first outlet pipe 3 and the hot water in the outlet pipe merging pipe 8 so that the output from the hot water supply temperature detection means 14 becomes ts (step 5). Hot water adjusted to the set temperature ts is supplied from the hot water supply port 11 through the mixed water pipe 9.

図４は、貯湯槽１内の温度分布の変化を示した図である。横軸に温度、縦軸に貯湯槽１の高さを示し、４５の温度分布は、中間的な温度帯である中温層の上端が第２の出湯管４の貯湯槽１との接続位置にある場合、つまり、中温層の給湯利用が開始される直前の様子である。第１の出湯管３と第２の出湯管４の両方から出湯される間、中温層は縮小しながら貯湯槽１の上方へ移動する。 FIG. 4 is a diagram showing changes in the temperature distribution in the hot water tank 1. The horizontal axis indicates the temperature, and the vertical axis indicates the height of the hot water tank 1. The temperature distribution of 45 indicates that the upper end of the intermediate temperature layer, which is an intermediate temperature zone, is at the position where the second hot water pipe 4 is connected to the hot water tank 1. In some cases, that is, just before the hot water supply in the middle temperature zone is started. While the hot water is discharged from both the first hot water discharge pipe 3 and the second hot water discharge pipe 4, the intermediate temperature layer moves upward of the hot water storage tank 1 while being reduced.

両方から出湯したときの出湯管合流管８での湯温がｔｓ以下になると、第２の出湯管４からの出湯は停止し、中温層はそのまま貯湯槽１の上方へ移動する。この結果、中温層の大きさは当初は１５ｆであったものが１５ｇまで縮小する。４６は、中温層１５ｇが第２の出湯管４の接続位置を通過した時点の温度分布である。 When the hot water temperature at the hot water joining pipe 8 when the hot water is discharged from both becomes ts or less, the hot water from the second hot water pipe 4 is stopped, and the intermediate temperature layer is moved as it is above the hot water tank 1. As a result, the size of the intermediate temperature layer is initially 15 f but is reduced to 15 g. 46 is a temperature distribution at the time when the intermediate temperature layer 15g passes through the connection position of the second hot water discharge pipe 4.

図５は、熱利用端末２３での熱利用があった場合の制御のブロック図を示し、熱利用温度検知手段２４の出力と、熱利用温度設定手段３１の設定に基づいて、ポンプ２５の制御を行う制御手段３２からなる。 FIG. 5 shows a block diagram of control when heat is used at the heat use terminal 23, and the control of the pump 25 is based on the output of the heat use temperature detecting means 24 and the setting of the heat use temperature setting means 31. It consists of the control means 32 which performs.

図６は、熱利用端末２３での熱利用があった場合の制御のフローチャートである。熱利用端末での利用が開始されると、熱利用温度検知手段２４で熱利用端末の温度ｔｅを検知し、ｔｅと熱利用端末設定温度ｔｓ３との比較を行う（ステップ６）。ｔｅがｔｓ３よりも低い場合は、ポンプの駆動を開始し（ステップ７）、高い場合は、ポンプの駆動を停止する（ステップ８）。 FIG. 6 is a flowchart of control when heat is used at the heat use terminal 23. When the use at the heat utilization terminal is started, the heat utilization temperature detection means 24 detects the temperature te of the heat utilization terminal, and compares te with the heat utilization terminal set temperature ts3 (step 6). When te is lower than ts3, the driving of the pump is started (step 7), and when it is higher, the driving of the pump is stopped (step 8).

図７は、貯湯槽１内の熱利用戻り管２２からの湯による温度変化と、給湯が発生した場合の温度変化について説明したものであり、横軸に温度、縦軸に貯湯槽１高さをとって温度分布を示す。Ｔ１は給水温度であり、Ｔ３は貯湯槽１上部の温度、Ｔ２は熱利用戻り管２２からの湯の流入により生じた中温水の温度である。 FIG. 7 illustrates the temperature change caused by the hot water from the heat utilization return pipe 22 in the hot water tank 1 and the temperature change when hot water is generated. The horizontal axis indicates the temperature, and the vertical axis indicates the hot water tank 1 height. The temperature distribution is shown. T1 is the feed water temperature, T3 is the temperature of the upper part of the hot water storage tank 1, and T2 is the temperature of the medium temperature water generated by the inflow of hot water from the heat utilization return pipe 22.

図７（ａ）の６１は初期の温度分布であり、その状態から貯湯槽１の上部に熱利用戻り管２２からの湯が流入した場合、図７（ｂ）の６２に示すような温度分布となる。Ｔ２は、熱利用戻り管２２から流入する温度とＴ３によって変化するが、必ず、貯湯槽１の熱利用戻り管２２が接続されている位置より下の湯が中温水となる。 Reference numeral 61 in FIG. 7A denotes an initial temperature distribution. When hot water from the heat utilization return pipe 22 flows into the upper part of the hot water tank 1 from that state, the temperature distribution as indicated by 62 in FIG. It becomes. Although T2 changes with the temperature which flows in from the heat | fever utilization return pipe | tube 22, and T3, the hot water below the position where the heat | fever utilization return pipe | tube 22 of the hot water storage tank 1 is connected is always medium temperature water.

その後、給湯が発生した場合、第２の出湯管４が熱利用戻り管よりも下の位置に接続されているため、熱利用戻り管２２により生じた中温水が、優先的に利用され、熱利用戻り管２２による温度分布変化の影響を取り除くことができる。 Thereafter, when hot water is generated, the second hot water discharge pipe 4 is connected to a position below the heat-use return pipe, so that the medium-temperature water generated by the heat-use return pipe 22 is preferentially used, The influence of the temperature distribution change by the utilization return pipe 22 can be removed.

また、熱利用戻り管２２は貯湯槽１の上部に接続されており、貯湯槽１下部の温度が給水温度Ｔ１に保たれているため、沸き上げ時に加熱装置に中温水が循環して効率が低下することは無くなる。 In addition, since the heat return pipe 22 is connected to the upper part of the hot water tank 1 and the temperature of the lower part of the hot water tank 1 is maintained at the feed water temperature T1, the medium temperature water circulates in the heating device at the time of boiling and the efficiency is increased. It will never drop.

次に、給湯温度ｔｓを生成するために、図１に示す第１の混合弁６と第２の混合弁７の接続構成によって、第１の出湯管３と第２の出湯管４と給水管５の湯水を混合する際の作用について述べる。 Next, in order to generate the hot water supply temperature ts, the first hot water discharge pipe 3, the second hot water discharge pipe 4, and the water supply pipe are connected by the connection configuration of the first mixing valve 6 and the second mixing valve 7 shown in FIG. The action at the time of mixing 5 hot water will be described.

図１に示す第１の混合弁６と第２の混合弁７の接続構成とすることで、貯湯槽１上部の湯の利用を抑えることができることについて説明する。 It will be described that the use of hot water in the upper part of the hot water tank 1 can be suppressed by adopting the connection configuration of the first mixing valve 6 and the second mixing valve 7 shown in FIG.

ここで、第１の混合弁６と第２の混合弁７の他の接続構成として、図８に示すように、まず、第１の出湯管３の湯と第２の出湯管４の湯を給湯温度ｔｓより所定温度高い温度ｔｓ４に混合した後に、給水分岐管１０の水と混合して給湯温度ｔｓとすることが考えられる。 Here, as another connection configuration of the first mixing valve 6 and the second mixing valve 7, as shown in FIG. 8, first, the hot water of the first hot water discharge pipe 3 and the hot water of the second hot water discharge pipe 4 are used. It is conceivable that after mixing at a temperature ts4 higher than the hot water supply temperature ts by a predetermined temperature, it is mixed with water in the water supply branch pipe 10 to obtain the hot water supply temperature ts.

本実施の形態で第１の混合弁６での混合温度は、給湯温度より所定温度低い温度とするが、この接続構成の場合は、第１の混合弁６での混合温度は、給湯温度より所定温度高い温度とする。一般的に、温度制御を行う場合は、貯湯槽１内の温度分布や、温度検知手段の精度のばらつきを考慮して、目標温度に対して温度幅を持たすことが通常用いられる方法であるが、混合弁の接続構成によって、前述のように温度幅に違いが発生し、これが第２の出湯管４から取り出す湯の温度によって、貯湯槽１上部の湯の利用量が変化する。 In the present embodiment, the mixing temperature at the first mixing valve 6 is a predetermined temperature lower than the hot water supply temperature. In this connection configuration, the mixing temperature at the first mixing valve 6 is higher than the hot water supply temperature. The temperature is a predetermined temperature higher. In general, when temperature control is performed, it is a commonly used method to provide a temperature range with respect to a target temperature in consideration of temperature distribution in the hot water tank 1 and variations in accuracy of temperature detection means. Depending on the connection configuration of the mixing valve, a difference occurs in the temperature range as described above, and the amount of hot water used in the upper part of the hot water tank 1 varies depending on the temperature of the hot water taken out from the second hot water discharge pipe 4.

図９（a）および（ｂ）は、図１および図８それぞれの混合弁の接続構成において、第１の出湯管３の出湯温度を６５℃、給湯温度ｔｓを４０℃、給水管５内の給水の温度を９℃で、第２の出湯管４から給水温度以上、給湯温度以下の湯を取り出す場合の各出湯管の出湯流量を示したものである。 9 (a) and 9 (b) are diagrams showing the connection configuration of the mixing valves in FIGS. 1 and 8, respectively, wherein the temperature of the first hot water discharge pipe 3 is 65 ° C., the hot water supply temperature ts is 40 ° C., The temperature of the feed water is 9 ° C., and the tapping flow rate of each tapping pipe when hot water having a temperature not less than the feed water temperature and not more than the hot water temperature is taken out from the second tapping pipe 4 is shown.

これにより、図１に示す混合弁の接続構成において、第２の出湯管４から給水温度以上、給湯温度以下の湯が多く利用され、貯湯槽１上部の湯の利用が抑えられていることが分かる。 Thereby, in the connection configuration of the mixing valve shown in FIG. 1, a lot of hot water having a temperature equal to or higher than the water supply temperature and lower than or equal to the hot water temperature is used from the second hot water outlet pipe 4, and the use of the hot water in the upper part of the hot water tank 1 is suppressed. I understand.

次に、貯湯槽１上部の湯の利用を抑えることによって、熱利用端末２３での熱利用の効率を向上する効果について説明する。 Next, the effect of improving the efficiency of heat utilization at the heat utilization terminal 23 by suppressing the use of hot water at the upper part of the hot water tank 1 will be described.

熱利用戻り管２２の接続位置が、貯湯槽１上部と貯湯槽１と第２の出湯管４とが接続された位置の間であると、熱利用端末２３での熱利用が発生した場合に、熱利用戻り管２２からの湯の流入により生じた中温水が生じ、貯湯槽１上部の湯が急激に減少する為、次の熱利用端末２３での熱利用に備えることができない場合がある。 When the heat utilization return pipe 22 is located between the upper part of the hot water tank 1 and the position where the hot water tank 1 and the second hot water discharge pipe 4 are connected, heat utilization at the heat utilization terminal 23 occurs. Since the hot water generated by the inflow of hot water from the heat utilization return pipe 22 is generated and the hot water in the upper part of the hot water storage tank 1 is rapidly reduced, it may not be possible to prepare for the heat utilization in the next heat utilization terminal 23. .

図１０は、熱利用端末２３の例として、風呂追い焚きが発生した後、給湯が発生した場合の図１および図８それぞれの混合弁の接続構成についての温度変化について説明したものであり、横軸に温度、縦軸に貯湯槽１高さをとって温度分布を示す。Ｔ４は給水温度であり、Ｔ６は貯湯槽１上部の温度、Ｔ５は熱利用戻り管２２からの湯の流入により生じた中温水の温度である。 FIG. 10 illustrates, as an example of the heat utilization terminal 23, temperature changes with respect to the connection configurations of the mixing valves in FIGS. 1 and 8 when hot water supply occurs after bath reheating occurs. The temperature distribution is shown with the temperature on the axis and the height of the hot water tank 1 on the vertical axis. T4 is the feed water temperature, T6 is the temperature of the upper part of the hot water tank 1, and T5 is the temperature of the medium temperature water generated by the inflow of hot water from the heat utilization return pipe 22.

図１０(a)の８１は風呂追い焚きが発生した直後の温度分布であり、その状態から給湯が発生し、その給湯温度が熱利用戻り管２２からの湯の流入により生じた中温水の温度Ｔ５よりも高い場合、図８に示す混合弁の接続構成では、第２の出湯管４からの湯に対して第１の出湯管３からの湯を多く混合して、給湯温度より所定温度高い温度としてから給湯温度とするため、貯湯槽１上部の湯を多く利用しなければならず、図１０(ｂ)の８３のような温度分布となる。 Reference numeral 81 in FIG. 10 (a) denotes a temperature distribution immediately after the bath reheating occurs, hot water is generated from this state, and the hot water temperature is the temperature of the intermediate temperature water generated by the inflow of hot water from the heat utilization return pipe 22. When the temperature is higher than T5, in the connection configuration of the mixing valve shown in FIG. 8, a large amount of hot water from the first tapping pipe 3 is mixed with hot water from the second tapping pipe 4, and a predetermined temperature higher than the hot water supply temperature. In order to set the hot water supply temperature after the temperature, a large amount of hot water in the upper part of the hot water tank 1 must be used, resulting in a temperature distribution as indicated by 83 in FIG.

しかし、図１に示す混合弁の接続構成であれば、第１の混合弁６からの給湯温度より所定温度低い温度の湯と、第１の出湯管３からの湯により給湯温度とするので、給湯温度を超えることがなく、図８に示す混合弁の接続構成に比べ貯湯槽１上部の湯の利用を抑えることができるので、図１０（ｂ）の８２のように、８３の温度分布と比べて斜線部８４だけ貯湯槽１上部の湯の残量が多くなるような温度分布となる。 However, in the connection configuration of the mixing valve shown in FIG. 1, since the hot water temperature is a predetermined temperature lower than the hot water temperature from the first mixing valve 6 and the hot water from the first tapping pipe 3, Since the use of hot water in the upper part of the hot water tank 1 can be suppressed as compared with the connection configuration of the mixing valve shown in FIG. 8 without exceeding the hot water supply temperature, as indicated by 82 in FIG. Compared with the shaded portion 84, the temperature distribution is such that the remaining amount of hot water in the upper part of the hot water tank 1 is increased.

ここで例えば、貯湯槽１の上部の温度Ｔ６が６５℃、給水温度Ｔ４が１０℃、熱利用戻り管２２からの湯の流入により生じた中温水の温度Ｔ５が３５℃とした場合に、図１０(a)の温度分布の状態から、シャワー等の給湯が設定温度４０℃で８０Ｌ発生すると、図８に示す混合弁の接続構成では、第２の出湯管４からの湯を４６Ｌ、貯湯槽１上部の湯を２３Ｌと、給水分岐管１０からの給水を１１Ｌ利用しなければならない。 Here, for example, when the temperature T6 of the upper part of the hot water tank 1 is 65 ° C., the feed water temperature T 4 is 10 ° C., and the temperature T 5 of medium temperature water generated by the inflow of hot water from the heat utilization return pipe 22 is 35 ° C. When 80 L of hot water such as a shower is generated at a set temperature of 40 ° C. from the state of the temperature distribution of 10 (a), 46 L of hot water from the second tapping pipe 4 is used in the connection configuration of the mixing valve shown in FIG. 1 23L of hot water in the upper part and 11L of water supplied from the water supply branch pipe 10 must be used.

しかし、図１に示す混合弁の接続構成であれば、第２の出湯管４からの湯を６７Ｌと、貯湯槽１上部の湯を１３Ｌの利用で済むので、貯湯槽１上部の湯を１０Ｌ多く利用することができる。 However, with the connection configuration of the mixing valve shown in FIG. 1, 67 L of hot water from the second tapping pipe 4 and 13 L of hot water in the upper part of the hot water tank 1 can be used, so 10 L of hot water in the upper part of the hot water tank 1 can be used. Many can be used.

したがってその後に、設定温度４０℃で１８０Ｌの湯が張られている風呂の温度が約１℃低下して、風呂追い焚きを行う時に、図８に示す混合弁の接続構成では行えない場合でも、図１に示す混合弁の接続構成であれば、再び設定温度まで昇温することができる。 Therefore, after that, when the temperature of the bath in which 180 L of hot water is stretched at a set temperature of 40 ° C. is lowered by about 1 ° C. and the bath is reheated, even when the connection configuration of the mixing valve shown in FIG. If it is the connection structure of the mixing valve shown in FIG. 1, it can heat up to preset temperature again.

図１１は第２の出湯管４、および、出湯管合流管８と貯湯槽１の対流の状態を示す図である。従来技術の図１５に対して、第１の混合弁が貯湯槽１と第２の出湯管４の接続位置よりも低い位置に接続されているため、出湯管合流管８の配管内で冷えた湯は、比重が重いため第２の出湯管４を遡って貯湯槽１へ流れ込むことはない。 FIG. 11 is a diagram showing a convection state of the second hot water discharge pipe 4 and the hot water discharge pipe joining pipe 8 and the hot water storage tank 1. Compared with FIG. 15 of the prior art, the first mixing valve is connected to a position lower than the connection position of the hot water storage tank 1 and the second hot water discharge pipe 4, so that it is cooled in the pipe of the hot water discharge pipe joining pipe 8. Since hot water has a high specific gravity, the hot water does not flow back into the hot water tank 1 through the second hot water outlet pipe 4.

また、冷えた湯が貯湯槽１へ流れ込まないため、貯湯槽１から高温の湯が出湯管合流管８へ供給されることもなく、配管の放熱による対流の発生を防止することができる。 In addition, since the cold water does not flow into the hot water storage tank 1, high temperature hot water is not supplied from the hot water storage tank 1 to the hot water discharge pipe joining pipe 8, and the occurrence of convection due to heat radiation of the pipe can be prevented.

このように、本発明の第一の実施の形態によれば、第１の混合弁６を第２の出湯管４と貯湯槽１の接続位置よりも低い位置に配置する構成により、第２の出湯管４、および、出湯管合流管８と貯湯槽１との間の対流による放熱ロスを低減することができるため、熱利用戻り管２２によって生じる中温水の影響を取り除き、沸き上げ時の効率低下を防ぐことができるので、良好な使い勝手と高い省エネルギー性とを実現できる。 As described above, according to the first embodiment of the present invention, the first mixing valve 6 is arranged at a position lower than the connection position between the second hot water discharge pipe 4 and the hot water storage tank 1, so that the second The heat loss due to the convection between the hot water pipe 4 and the hot water pipe merging pipe 8 and the hot water storage tank 1 can be reduced, so that the influence of the medium temperature water generated by the heat utilization return pipe 22 is removed, and the efficiency at the time of boiling is increased. Since deterioration can be prevented, good usability and high energy saving can be realized.

さらに、ヒートポンプ装置２の冷凍サイクルは冷媒として二酸化炭素を用い、臨界圧を越える圧力で運転することが好ましい。二酸化炭素を冷媒として用いることで沸き上げ温度を高温にできるので、貯湯槽１内の湯温を自在に制御できる。 Furthermore, the refrigeration cycle of the heat pump device 2 preferably uses carbon dioxide as a refrigerant and is operated at a pressure exceeding the critical pressure. Since the boiling temperature can be increased by using carbon dioxide as a refrigerant, the hot water temperature in the hot water tank 1 can be freely controlled.

（実施の形態２）
図１２は、本発明の第２の実施の形態における貯湯式給湯装置の構成を示す図である。 (Embodiment 2)
FIG. 12 is a diagram showing a configuration of a hot water storage type hot water supply apparatus according to the second embodiment of the present invention.

第１の実施の形態の構成に加えて、第１の出湯管３の途中から分岐する注湯用第１の出湯管４６と出湯管合流管８の途中から分岐する注湯用出湯管合流管４７とが入口側に接続
された第３の混合弁４２と、第３の混合弁４２の出口側に接続された注湯用混合水管４３を備えている。 In addition to the configuration of the first embodiment, the first pouring pipe 46 for pouring branched from the middle of the first tap pipe 3 and the pouring pipe joining pipe for branching from the middle of the tap pipe merging pipe 8. 47 is provided with a third mixing valve 42 connected to the inlet side and a pouring mixed water pipe 43 connected to the outlet side of the third mixing valve 42.

さらに、注湯用混合水管４３に接続される注湯口４４と、注湯用混合水管４３を流れる湯温を検知する注湯温度検知手段４５とを備えている。 Further, a pouring port 44 connected to the pouring mixed water pipe 43 and a pouring temperature detecting means 45 for detecting the temperature of the hot water flowing through the pouring mixed water pipe 43 are provided.

図１３は、第３の実施の形態における制御のブロック図を示し、中温検知手段１２と、合流温検知手段１３、給湯温度検知手段１４、および注湯温度検知手段４５の出力と、給湯温度設定手段３０、および、熱利用温度設定手段３１の設定に基づいて、第１の混合弁６と第２の混合弁７と第３の混合弁４２の制御を行う二温度制御手段３４からなる。 FIG. 13 shows a block diagram of the control in the third embodiment. The outputs of the intermediate temperature detecting means 12, the combined temperature detecting means 13, the hot water temperature detecting means 14, the hot water temperature detecting means 45, and the hot water temperature setting. Based on the setting of the means 30 and the heat utilization temperature setting means 31, the first mixing valve 6, the second mixing valve 7, and the third mixing valve 42 are controlled.

以下、注湯が開始される場合の動作を、図１４の制御のフローチャートを用いて説明する。ここで、ｔｓ４を熱利用温度設定手段３１で設定される温度ｔｓ３よりも例えばー５℃といった所定温度低い温度とする。 Hereinafter, the operation when pouring is started will be described with reference to the control flowchart of FIG. Here, ts4 is set to a temperature lower than the temperature ts3 set by the heat utilization temperature setting means 31, for example, by a predetermined temperature such as −5 ° C.

注湯が開始されると、ｔｍとｔｓ４の大小関係を判断し（ステップ１１）、ｔｍがｔｓ４より高い場合は、合流温検知手段１３で検知する湯温に基づいて、合流温検知手段１３がｔｓ３になるように第２の混合弁７の開度を調整する（ステップ１２）。また、第３の混合弁４２は、注湯用出湯管合流管４７からのみ注湯用混合水管４３へ出湯するように注湯用出湯管合流管４７側に全開にする（ステップ１３）。 When pouring is started, the magnitude relationship between tm and ts4 is determined (step 11). If tm is higher than ts4, the merging temperature detecting means 13 is based on the hot water temperature detected by the merging temperature detecting means 13. The opening degree of the second mixing valve 7 is adjusted to be ts3 (step 12). Further, the third mixing valve 42 is fully opened to the pouring hot water discharge pipe merging pipe 47 side so as to be discharged from the pouring hot water discharge pipe merging pipe 47 only to the pouring hot water mixing pipe 43 (step 13).

ｔｍがｔｓ４以下である場合は、第２の混合弁７は、第２の出湯管４からのみ出湯管合流管８へ出湯するように、第２の出湯管４側に全開にする（ステップ１４）。その後、注湯温度検知手段４５からの出力がｔｓ３になるように、第３の混合弁４２によって注湯用出湯管合流管４７の湯と注湯用第１の出湯管４６の湯を混合する（ステップ１５）。設定温度ｔｓ３に調整された湯は、注湯用混合水管４３を通じて注湯口４４から給湯される。 When tm is equal to or less than ts4, the second mixing valve 7 is fully opened to the second tapping pipe 4 side so as to pour hot water only from the second tapping pipe 4 to the tapping pipe joining pipe 8 (step 14). ). Thereafter, the third mixing valve 42 mixes the hot water in the pouring hot water discharge pipe merging pipe 47 and the hot water in the first hot pouring pipe 46 for pouring so that the output from the pouring temperature detecting means 45 becomes ts3. (Step 15). The hot water adjusted to the set temperature ts3 is supplied from the pouring port 44 through the pouring mixed water pipe 43.

なお、給湯が発生した場合は、図３で示すフローチャートと同様の処理を行い、熱利用端末２３で注湯以外の熱利用があった場合は、図５、図６に示すフローチャートと同様の処理を行う。 In addition, when hot water supply generate | occur | produces, the process similar to the flowchart shown in FIG. 3 is performed, and when there exists heat utilization other than pouring in the heat | fever utilization terminal 23, the process similar to the flowchart shown to FIG. 5, FIG. I do.

このように、本発明の第２の実施の形態によれば、浴槽へ湯張りを行う注湯の際にも中温水を優先的に利用することで、さらに沸き上げ時の効率低下を防ぐことができるため、より良好な使い勝手と高い省エネルギー性とを実現できる。 As described above, according to the second embodiment of the present invention, it is possible to prevent lowering of efficiency at the time of boiling by preferentially using medium-temperature water even when pouring hot water into a bathtub. Therefore, it is possible to achieve better usability and higher energy savings.

以上のように、本発明にかかる貯湯式給湯装置は、貯湯槽内の湯の熱を利用する場合において熱利用端末利用による効率の低下を減少させるので、家庭用の貯湯式給湯装置に適用できるほか、熱源と貯湯槽を有するシステムにおいて業務用などの規模の大きい用途にも適用し、優れた省エネルギー性を提供できる。 As described above, the hot water storage type hot water supply apparatus according to the present invention reduces the decrease in efficiency due to the use of the heat utilization terminal when using the heat of hot water in the hot water storage tank, and therefore can be applied to a domestic hot water storage type hot water supply apparatus. In addition, the system having a heat source and a hot water storage tank can be applied to large-scale applications such as for business use and can provide excellent energy saving.

１貯湯槽
２加熱手段（ヒートポンプ装置）
３第１の出湯管
４第２の出湯管
５給水管
６第１の混合弁
７第２の混合弁
８出湯管合流管
９混合水管
１０給水分岐管
１１給湯口
１２中温検知手段
１３合流温検知手段
１４給湯温度検知手段
１６沸き上げ管
２０熱交換器
２１熱利用出湯管
２２熱利用戻り管
２３熱利用端末
２４熱利用温度検知手段
２５ポンプ
３０給湯温度設定手段
３１熱利用温度設定手段
３２制御手段
３３制御装置
３４二温度制御手段
４２第３の混合弁
４３注湯用混合水管
４４注湯口
４５注湯温度検知手段
４６注湯用第１の出湯管
４７注湯用出湯管合流管 1 Hot water tank 2 Heating means (heat pump device)
DESCRIPTION OF SYMBOLS 3 1st hot water pipe 4 2nd hot water pipe 5 Water supply pipe 6 1st mixing valve 7 2nd mixing valve 8 Hot water discharge pipe merge pipe 9 Mixed water pipe 10 Feed water branch pipe 11 Hot water outlet 12 Middle temperature detection means 13 Combined temperature detection Means 14 Hot water supply temperature detection means 16 Boiling pipe 20 Heat exchanger 21 Heat utilization hot water discharge pipe 22 Heat utilization return pipe 23 Heat utilization terminal 24 Heat utilization temperature detection means 25 Pump 30 Hot water supply temperature setting means 31 Heat utilization temperature setting means 32 Control means 33 Controller 34 Two-temperature control means 42 Third mixing valve 43 Mixing water pipe for pouring 44 Pouring port 45 Pouring temperature detecting means 46 First tapping pipe for pouring 47 First tapping pipe for pouring 47

Claims

貯湯槽と、
前記貯湯槽の上部に接続された第１の出湯管と、
前記貯湯槽の下部に接続された給水管と、
前記貯湯槽の上下方向において、
前記第１の出湯管が接続された位置と前記給水管が接続された位置との間に接続された第２の出湯管と、
前記給水管から分岐された給水分岐管と、
前記第２の出湯管と前記給水分岐管とが入口側に接続された第１の混合弁と、
前記第１の混合弁の出口側に接続された出湯管合流管と、
前記第1の出湯管と前記出湯管合流管とが入口側に接続された第２の混合弁と、
前記第２の混合弁の出口側に接続された混合水管と、
前記貯湯槽の上部に接続された熱利用出湯管と、
前記熱利用出湯管に接続された熱交換器と、
前記熱交換器と前記貯湯槽に接続された熱利用戻り管と、
を備え、
前記熱利用戻り管は、前記貯湯槽の上下方向において、
前記第２の出湯管の前記貯湯槽の接続位置よりも高い位置で、前記貯湯槽に接続されており、
前記第１の混合弁は、前記貯湯槽の上下方向において、
前記第２の出湯管の前記貯湯槽の接続位置よりも低い位置で、前記貯湯槽と接続されていることを特徴とする貯湯式給湯装置。 A hot water tank,
A first hot water pipe connected to the upper part of the hot water storage tank;
A water supply pipe connected to the lower part of the hot water tank;
In the vertical direction of the hot water tank,
A second hot water pipe connected between a position where the first hot water pipe is connected and a position where the water supply pipe is connected;
A water supply branch pipe branched from the water supply pipe;
A first mixing valve in which the second hot water discharge pipe and the feed water branch pipe are connected to the inlet side;
A tapping pipe joining pipe connected to the outlet side of the first mixing valve;
A second mixing valve in which the first tapping pipe and the tapping pipe merging pipe are connected to the inlet side;
A mixing water pipe connected to the outlet side of the second mixing valve;
A heat utilization hot water pipe connected to the upper part of the hot water storage tank;
A heat exchanger connected to the heat-utilizing hot water outlet pipe;
A heat return pipe connected to the heat exchanger and the hot water storage tank;
With
The heat return pipe is in the vertical direction of the hot water tank,
Connected to the hot water storage tank at a position higher than the connection position of the hot water storage tank of the second hot water discharge pipe,
In the vertical direction of the hot water tank, the first mixing valve is
A hot water storage type hot water supply apparatus connected to the hot water storage tank at a position lower than a connection position of the hot water storage tank of the second hot water discharge pipe.

前記第１の出湯管から分岐された注湯用第１の出湯管と、
前記出湯管合流管から分岐された注湯用出湯管合流管と、
を備え、
前記注湯用第１の出湯管と前記注湯用出湯管合流管とが入口側に接続され、
出口側には注湯用混合水管が接続されている第３の混合弁を、
有することを特徴とする前記請求項１に記載の貯湯式給湯装置。 A first pouring pipe for pouring branched from the first pouring pipe;
A hot water outlet pipe junction pipe branched from the hot water outlet joint pipe;
With
The first pouring pipe for pouring and the pouring pipe joining pipe for pouring are connected to the inlet side,
On the outlet side, a third mixing valve to which a mixing water pipe for pouring is connected,
The hot water storage type hot water supply apparatus according to claim 1, wherein the hot water storage type hot water supply apparatus is provided.