JP5457803B2 - Hot water storage hot water supply system - Google Patents

Hot water storage hot water supply system Download PDF

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JP5457803B2
JP5457803B2 JP2009266957A JP2009266957A JP5457803B2 JP 5457803 B2 JP5457803 B2 JP 5457803B2 JP 2009266957 A JP2009266957 A JP 2009266957A JP 2009266957 A JP2009266957 A JP 2009266957A JP 5457803 B2 JP5457803 B2 JP 5457803B2
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hot water
pipe
mixed
storage tank
water supply
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慎也 澤田
信二 山脇
秀人 新保
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Panasonic Corp
Panasonic Holdings Corp
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Matsushita Electric Industrial Co Ltd
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Description

本発明は、即湯を行う貯湯式給湯システムに関する。   The present invention relates to a hot water storage type hot water supply system that performs instant hot water.

従来から、ヒートポンプによって水を沸かし、貯湯タンクに溜めた湯をカランや食洗機等の湯使用端末に供給する貯湯式給湯システムがある。貯湯タンクは、ヒートポンプと共に屋外に設置されることが多く、タンクから湯の使用端末までの配管距離が長いので、湯を使用しない時間が長くなると配管中の湯温が低下し、湯の使用開始時に配管内に残留している湯が貯湯タンクから送湯された湯に置換されるまで待たねばならない。そこで、配管中の湯温が低下すると送湯ポンプによって配管中の湯を貯湯タンクに返湯し、貯湯タンクの高温湯を配管に送湯して循環させ、配管中の湯温の低下を防ぐことにより、湯の使用開始時に直ぐに高温湯を出湯することができる即湯を行うようにした貯湯式給湯システムが知られている（例えば、特許文献１参照）。   Conventionally, there is a hot water storage type hot water supply system in which water is boiled by a heat pump and hot water stored in a hot water storage tank is supplied to a hot water use terminal such as a currant or a dishwasher. Hot water storage tanks are often installed outdoors together with a heat pump, and the piping distance from the tank to the terminal where hot water is used is long, so if the time when hot water is not used increases, the temperature of the hot water in the piping decreases and the use of hot water begins. Sometimes it is necessary to wait until the hot water remaining in the pipe is replaced with the hot water sent from the hot water storage tank. Therefore, when the hot water temperature in the pipe drops, the hot water pump returns the hot water in the pipe to the hot water storage tank, and the hot water in the hot water storage tank is sent to the pipe and circulated to prevent the hot water temperature in the pipe from dropping. Therefore, there is known a hot water storage type hot water supply system that performs hot water that allows hot water to be discharged immediately at the start of hot water use (see, for example, Patent Document 1).

このような貯湯式給湯システムの例を、図５を参照して説明する。貯湯式給湯システム１０１は、給水と加熱された湯を貯留する貯湯タンク１０２と、貯湯タンク１０２の水を加熱するヒートポンプ１０３と、ヒートポンプ１０３等の動作を制御する制御部１０４と、貯湯タンク１０２の高温湯を給湯する高温給湯管１０５と、中温の混合湯を給湯する混合給湯管１０６とを備えている。   An example of such a hot water storage type hot water supply system will be described with reference to FIG. The hot water storage hot water supply system 101 includes a hot water storage tank 102 for storing hot water and heated water, a heat pump 103 for heating water in the hot water storage tank 102, a control unit 104 for controlling the operation of the heat pump 103, and the hot water storage tank 102. A high-temperature hot water supply pipe 105 for supplying high-temperature hot water and a mixed hot-water supply pipe 106 for supplying medium-temperature mixed hot water are provided.

貯湯タンク１０２の下層部は給水を行なう給水管１７１に接続されている。また、貯湯タンク１０２の下層部は配管１７２を介してヒートポンプ１０３と接続されており、貯湯タンク１０２下層部の水がヒートポンプ１０３で加熱される。ヒートポンプ１０３は加熱した湯を貯湯タンク１０２に送るポンプ１３１を有している。ヒートポンプ１０３は貯湯タンク１０２の上層部と配管１７３を介して接続されており、加熱した湯を貯湯タンク１０２の上層部に供給する。   The lower layer of the hot water storage tank 102 is connected to a water supply pipe 171 that supplies water. Further, the lower layer portion of the hot water storage tank 102 is connected to the heat pump 103 via the pipe 172, and the water in the lower layer portion of the hot water storage tank 102 is heated by the heat pump 103. The heat pump 103 has a pump 131 that sends heated hot water to the hot water storage tank 102. The heat pump 103 is connected to the upper layer portion of the hot water storage tank 102 via a pipe 173 and supplies heated hot water to the upper layer portion of the hot water storage tank 102.

貯湯タンク１０２の上層部は高温給湯配管１０５を介して高温給湯口１５１と接続されており、高温給湯管１０５には管中の湯温を検出する温度センサ１５２が設けられている。高温給湯管１０５の高温給湯口１５１付近から、高温給湯管１０５中の湯を貯湯タンク１０２に返すための高温返湯管１５３が分岐しており、高温返湯管１５３の途中には送湯ポンプ１５４が設けられている。   The upper layer portion of the hot water storage tank 102 is connected to a high temperature hot water supply port 151 via a high temperature hot water supply pipe 105, and the high temperature hot water supply pipe 105 is provided with a temperature sensor 152 for detecting the temperature of the hot water in the pipe. A high temperature hot water return pipe 153 for returning hot water in the high temperature hot water supply pipe 105 to the hot water storage tank 102 is branched from the vicinity of the high temperature hot water supply opening 151 of the high temperature hot water supply pipe 105. 154 is provided.

混合給湯管１０６は、高温給湯管１０５から分岐した高温出湯管１６１と、貯湯タンク１０２の中層部の湯を取り出す中温出湯管１６２と、高温出湯管１６１と中温出湯管１６２とを接続する三方弁１６３と、三方弁１６３に接続されている混合弁入湯管１６４と、給水管１７１から分岐した混合弁入水管１６５と、混合弁入湯管１６４からの混合湯と混合弁入水管１６５からの給水とを混合する混合弁１６６と、混合弁１６６と混合給湯口１６７とを接続する混合湯管１６８とを有している。混合湯管１６８には管中の湯温を検出する温度センサ１６９が設けられている。   The mixed hot water pipe 106 is a three-way valve that connects a high temperature hot water pipe 161 branched from the high temperature hot water pipe 105, an intermediate temperature hot water pipe 162 that takes out hot water in the middle layer of the hot water storage tank 102, and a high temperature hot water pipe 161 and an intermediate temperature hot water pipe 162. 163, a mixing valve inlet pipe 164 connected to the three-way valve 163, a mixing valve inlet pipe 165 branched from the water supply pipe 171, a mixed hot water from the mixing valve inlet pipe 164, and a water supply from the mixing valve inlet pipe 165 And a mixing hot water pipe 168 that connects the mixing valve 166 and the mixing hot water supply port 167. The mixed hot water pipe 168 is provided with a temperature sensor 169 for detecting the hot water temperature in the pipe.

次に、貯湯式給湯システム１０１の動作について説明する。高温給湯口１５１が開かれると、給水管１７１からの給水が給水圧によって貯湯タンク１０２の下層部に入り、貯湯タンク１０２上層部の高温湯が押し上げられて高温給湯管１０５を通って高温給湯口１５１より給湯される。混合給湯管１６７が開かれると、制御部１０４は出湯する混合湯の設定温度に応じて、高温出湯管１６１からの高温湯と、中温出湯管１６２からの中温湯とのいずれかに三方弁１６３を切替え、切替えられた湯と混合弁入水管１６５からの給水とが給水圧によって混合弁１６６へ送られ、混合湯となって混合湯管１６８を通り混合給湯管１６７より給湯される。   Next, the operation of the hot water storage type hot water supply system 101 will be described. When the high temperature hot water supply port 151 is opened, the water supplied from the water supply pipe 171 enters the lower layer of the hot water storage tank 102 by the supply water pressure, the high temperature hot water in the upper layer of the hot water storage tank 102 is pushed up, and passes through the high temperature hot water supply pipe 105. Hot water is supplied from 151. When the mixed hot water supply pipe 167 is opened, the control unit 104 switches either the high temperature hot water from the high temperature hot water discharge pipe 161 or the intermediate temperature hot water from the medium temperature hot water supply pipe 162 according to the set temperature of the mixed hot water to be discharged. The hot water thus switched and the water supplied from the mixing valve inlet pipe 165 are sent to the mixing valve 166 by the feed water pressure, and mixed hot water is supplied from the mixed hot water pipe 167 through the mixed hot water pipe 168.

制御部１０４は、温度センサ１５２が検出した高温給湯管１０５中の湯温が所定の温度より低くなると送湯ポンプ１５４を駆動させる。高温給湯管１０５中の湯が高温返湯管１５３を介して貯湯タンク１０２の中層部に返され、貯湯タンク１０２の上層部の高温湯が高温給湯管１０５に送られて高温給湯管１０５及び高温返湯管１５３中の湯が循環する。温度センサ１５２が検出する湯温が所定の温度より高くなると送湯ポンプ１５４の駆動を停止する。このようにして、高温給湯管１０５内の湯温が常に所定の温度以上になるので、高温給湯口１５１を開くと直ぐに高温湯が出湯される。   The controller 104 drives the hot water supply pump 154 when the hot water temperature in the high temperature hot water supply pipe 105 detected by the temperature sensor 152 becomes lower than a predetermined temperature. Hot water in the high temperature hot water supply pipe 105 is returned to the middle layer of the hot water storage tank 102 via the high temperature hot water return pipe 153, and high temperature hot water in the upper layer of the hot water storage tank 102 is sent to the high temperature hot water supply pipe 105. Hot water in the return pipe 153 circulates. When the hot water temperature detected by the temperature sensor 152 becomes higher than a predetermined temperature, the hot water supply pump 154 is stopped. In this way, the hot water temperature in the high temperature hot water supply pipe 105 is always equal to or higher than the predetermined temperature, so that the high temperature hot water is discharged immediately when the high temperature hot water supply port 151 is opened.

しかしながら、このような貯湯式給湯システム１０１においては、混合湯管１６８中の湯は貯湯タンク１０２に返湯されないので、混合給湯口１６７が開かれても、混合湯管１６８中の湯が新たに混合された混合湯に置換されるまで待たなければならず、利便性が悪い。また、置換されるまで混合湯管１６８中の湯水を捨てなければならないので、湯水が無駄になる。   However, in such a hot water storage hot water supply system 101, the hot water in the mixed hot water pipe 168 is not returned to the hot water storage tank 102, so that the hot water in the mixed hot water pipe 168 is newly added even if the mixed hot water supply port 167 is opened. It is necessary to wait until the mixed hot water is replaced, which is inconvenient. Moreover, since the hot water in the mixed hot water pipe 168 must be thrown away until it is replaced, the hot water is wasted.

特開２００８−１５７５５１号公報JP 2008-157551 A

本発明は、上記問題を解消するものであり、湯水を無駄にすることなく中温の混合湯を直ぐに出湯することができる貯湯式給湯システムを提供することを目的とする。   An object of the present invention is to solve the above-described problem, and to provide a hot water storage type hot water supply system that can immediately discharge hot water of medium temperature without wasting hot water.

上記目的を達成するために請求項１の発明は、給水管に接続され給水と加熱された湯を貯留する貯湯タンクと、前記貯湯タンクの水を加熱する加熱源と、前記加熱源の動作を制御する制御部と、前記貯湯タンクの高温湯を給湯する高温給湯管と、前記貯湯タンクの高温湯又は中温湯と前記給水管からの給水とを混合した混合湯を給湯する混合給湯管と、即湯するために前記混合給湯管中の湯を前記貯湯タンクに戻す混合返湯管と、を備えた貯湯式給湯システムにおいて、前記混合給湯管は、前記貯湯タンクの上層部又は前記高温給湯管に接続された高温出湯管と、前記貯湯タンクの中層部に接続された中温出湯管と、前記高温出湯管と中温出湯管とを接続する三方弁と、前記三方弁に接続され送湯する混合弁入湯管と、前記給水管から分岐した混合弁入水管と、前記混合弁入湯管からの湯と混合弁入水管からの給水とを混合する混合弁と、この混合弁による混合湯を出湯する混合湯管と、を有し、前記混合返湯管は、前記混合湯管から分岐して前記貯湯タンクの中温部である中層部に接続されており、前記混合湯管中の湯を前記貯湯タンクに送湯する送湯ポンプを有しているものである。 In order to achieve the above object, the invention of claim 1 includes a hot water storage tank that is connected to a water supply pipe and stores hot water heated by water supply, a heating source that heats the water in the hot water storage tank, and an operation of the heating source. A control unit for controlling, a high temperature hot water supply pipe for supplying hot water in the hot water storage tank, a mixed hot water supply pipe for supplying hot water mixed with high temperature hot water or medium hot water in the hot water storage tank, and water supplied from the water supply pipe, A hot water storage system comprising a mixed hot water supply system for returning hot water in the mixed hot water pipe to the hot water storage tank for immediate hot water, wherein the mixed hot water pipe is an upper layer part of the hot water storage tank or the high temperature hot water pipe. A high temperature hot water pipe connected to the hot water storage tank, a medium temperature hot water pipe connected to the middle layer of the hot water storage tank, a three-way valve connecting the high temperature hot water pipe and the intermediate temperature hot water pipe, and a mixture for supplying hot water connected to the three-way valve Branch from the valve hot water pipe and the water supply pipe A mixing valve inlet pipe, a mixing valve for mixing hot water from the mixing valve inlet pipe and feed water from the mixing valve inlet pipe, and a mixing hot pipe for discharging hot water mixed by the mixing valve; The return hot water pipe is branched from the mixed hot water pipe and connected to a middle layer portion that is a middle temperature portion of the hot water storage tank, and has a hot water supply pump that supplies hot water in the mixed hot water pipe to the hot water storage tank. It is what.

請求項２の発明は、給水管に接続され給水と加熱された湯を貯留する貯湯タンクと、前記貯湯タンクの水を加熱する加熱源と、前記加熱源の動作を制御する制御部と、前記貯湯タンクの高温湯を給湯する高温給湯管と、前記貯湯タンクの高温湯又は中温湯と前記給水管からの給水とを混合した混合湯を給湯する混合給湯管と、即湯するために前記混合給湯管中の湯を前記貯湯タンクに戻す混合返湯管と、を備えた貯湯式給湯システムにおいて、前記混合給湯管は、前記貯湯タンクの上層部又は前記高温給湯管に接続された高温出湯管と、前記貯湯タンクの中層部に接続された中温出湯管と、前記高温出湯管と中温出湯管とを接続する三方弁と、前記三方弁に接続され送湯する混合弁入湯管と、前記給水管から分岐した混合弁入水管と、前記混合弁入湯管からの湯と混合弁入水管からの給水とを混合する混合弁と、この混合弁による混合湯を出湯する混合湯管と、を有し、前記混合返湯管は、前記混合湯管から分岐して前記貯湯タンクに接続されずに前記混合弁入水管に接続され、前記混合湯管中の湯を前記混合弁入水管に送湯する送湯ポンプを有しているものである。
The invention of claim 2 is a hot water storage tank that is connected to a water supply pipe and stores hot water heated by the water supply, a heating source that heats water in the hot water storage tank, a control unit that controls the operation of the heating source, A hot water supply pipe for supplying hot water in the hot water storage tank, a mixed hot water pipe for supplying hot water mixed with hot water or medium hot water in the hot water storage tank, and water supplied from the water supply pipe, and the mixing for instant hot water A hot water storage hot water system comprising a mixed return hot water pipe for returning hot water in a hot water pipe to the hot water storage tank, wherein the mixed hot water pipe is a high temperature hot water pipe connected to an upper layer portion of the hot water storage tank or the high temperature hot water pipe. A medium temperature hot water pipe connected to the middle layer of the hot water storage tank, a three-way valve connecting the high temperature hot water pipe and an intermediate temperature hot water pipe, a mixed valve hot water pipe connected to the three-way valve and feeding hot water, and the water supply A mixing valve inlet pipe branched from the pipe; A mixing valve for mixing hot water from the valve inlet hot water pipe and feed water from the mixing valve inlet water pipe, and a mixed hot water pipe for discharging the hot water mixed by the mixing valve; A hot water supply pump that branches from the pipe and is connected to the mixing valve inlet pipe without being connected to the hot water storage tank, and feeds hot water in the mixed hot water pipe to the mixing valve inlet pipe .

請求項３の発明は、給水管に接続され給水と加熱された湯を貯留する貯湯タンクと、前記貯湯タンクの水を加熱する加熱源と、前記加熱源の動作を制御する制御部と、前記貯湯タンクの高温湯を給湯する高温給湯管と、前記貯湯タンクの高温湯又は中温湯と前記給水管からの給水とを混合した混合湯を給湯する混合給湯管と、即湯するために前記混合給湯管中の湯を前記貯湯タンクに戻す混合返湯管と、を備えた貯湯式給湯システムにおいて、前記混合給湯管は、前記貯湯タンクの上層部又は前記高温給湯管に接続された高温出湯管と、前記貯湯タンクの中層部に接続された中温出湯管と、前記高温出湯管と中温出湯管とを接続する三方弁と、前記三方弁に接続され送湯する混合弁入湯管と、前記給水管から分岐した混合弁入水管と、前記混合弁入湯管からの湯と混合弁入水管からの給水とを混合する混合弁と、この混合弁による混合湯を出湯する混合湯管と、を有し、前記混合返湯管は、前記混合湯管から分岐し、混合湯の返湯先を切替える第２三方弁を介して前記貯湯タンクに繋がる返湯中温管と前記給水管に繋がる返湯低温管とに分岐し、前記混合湯管中の湯を前記返湯中温管又は返湯低温管に送湯する送湯ポンプを有し、前記返湯中温管が前記混合弁入水管に配管によって接続されているものである。   The invention of claim 3 is a hot water storage tank that is connected to a water supply pipe and stores hot water heated with water supply, a heating source that heats water in the hot water storage tank, a control unit that controls the operation of the heating source, A hot water supply pipe for supplying hot water in the hot water storage tank, a mixed hot water pipe for supplying hot water mixed with hot water or medium hot water in the hot water storage tank, and water supplied from the water supply pipe, and the mixing for instant hot water A hot water storage hot water system comprising a mixed return hot water pipe for returning hot water in a hot water pipe to the hot water storage tank, wherein the mixed hot water pipe is a high temperature hot water pipe connected to an upper layer portion of the hot water storage tank or the high temperature hot water pipe. A medium temperature hot water pipe connected to the middle layer of the hot water storage tank, a three-way valve connecting the high temperature hot water pipe and an intermediate temperature hot water pipe, a mixed valve hot water pipe connected to the three-way valve and feeding hot water, and the water supply A mixing valve inlet pipe branched from the pipe; A mixing valve for mixing hot water from the valve inlet hot water pipe and feed water from the mixing valve inlet water pipe, and a mixed hot water pipe for discharging the hot water mixed by the mixing valve; Branch from the pipe, branch to a hot water intermediate temperature pipe connected to the hot water storage tank and a hot water cold pipe connected to the water supply pipe via a second three-way valve for switching the hot water return destination of the mixed hot water, A hot water supply pump for supplying hot water to the return hot water intermediate temperature pipe or the return hot water cold pipe, and the return hot water intermediate temperature pipe connected to the mixing valve inlet pipe by piping;

請求項４の発明は、請求項１乃至請求項３のいずれか１項に記載の貯湯式給湯システムにおいて、前記混合返湯管は、湯の貯湯タンクへの返湯元を前記混合湯管又は高温給湯管から分岐した高温返湯管のいずれかに切替える第３三方弁を有したものである。   According to a fourth aspect of the present invention, in the hot water storage hot water supply system according to any one of the first to third aspects, the mixed hot water return pipe supplies the hot water return source to the hot water storage tank as the mixed hot water pipe or a high temperature. A third three-way valve for switching to any one of the hot water return pipes branched from the hot water supply pipe is provided.

請求項１の発明によれば、送湯ポンプによって温度の低下した混合湯管中の湯が貯湯タンクに返湯され、貯湯タンク中の高温湯、中温湯及び給水の混合湯が混合湯管に送湯されて混合湯管中の湯温が保持されるので、混合湯管の出湯口を開くと直ぐに中温の混合湯が出湯される。また、混合湯管と貯湯タンク中の湯水を循環させて捨てないので、湯水を無駄にすることがない。   According to the first aspect of the present invention, the hot water in the mixed hot water pipe whose temperature has been lowered by the hot water supply pump is returned to the hot water storage tank, and the hot water in the hot water storage tank, the mixed hot water in the hot water supply water, and the mixed hot water are supplied to the mixed hot water pipe. Since the hot water is supplied and the hot water temperature in the mixed hot water pipe is maintained, as soon as the outlet of the mixed hot water pipe is opened, the medium temperature mixed hot water is discharged. Moreover, since the hot water in the mixed hot water pipe and the hot water storage tank is not circulated and discarded, the hot water is not wasted.

請求項２の発明によれば、混合弁入水管を介して混合湯管中の湯を貯湯タンクに返湯するので、請求項１と同様の効果を得ることができる。また、混合返湯管が貯湯タンクに接続されずに混合弁入水管に接続されるので、混合返湯管の長さが短かくてよく、低コストにすることができる。   According to the invention of claim 2, since the hot water in the mixed hot water pipe is returned to the hot water storage tank through the mixing valve water pipe, the same effect as in the first aspect can be obtained. Moreover, since the mixed hot water pipe is connected to the mixing valve water pipe without being connected to the hot water storage tank, the length of the mixed hot water pipe may be short and the cost can be reduced.

請求項３の発明によれば、第２三方弁を介して混合湯管中の湯を貯湯タンクに返湯するので、請求項１と同様の効果を得ることができる。また、混合湯管中の混合湯の温度に応じて返湯先を貯湯タンクの中層部か給水管のいずれかに切替えることができるので、貯湯タンク中の湯温分布が乱されずに温度成層が維持され易く、高温湯、中温湯を効率良く出湯することができる。   According to the invention of claim 3, since the hot water in the mixed hot water pipe is returned to the hot water storage tank via the second three-way valve, the same effect as in claim 1 can be obtained. In addition, since the hot water return destination can be switched to either the middle layer of the hot water storage tank or the water supply pipe according to the temperature of the mixed hot water in the hot water mixing pipe, the temperature stratification is achieved without disturbing the hot water temperature distribution in the hot water storage tank. Is easily maintained, and hot and medium hot water can be discharged efficiently.

請求項４の発明によれば、高温給湯管中の高温湯と混合湯管中の混合湯の返湯を同一の配管で行うので、低コストになる。   According to the invention of claim 4, since the hot water in the hot water supply pipe and the hot water in the mixed hot water pipe are returned by the same pipe, the cost is reduced.

本発明の第１の実施形態に係る貯湯式給湯システムの構成図。The block diagram of the hot water storage type hot-water supply system which concerns on the 1st Embodiment of this invention. 同上実施形態の第１の変形例に係る貯湯式給湯システムの構成図。The block diagram of the hot water storage type hot-water supply system which concerns on the 1st modification of embodiment same as the above. 同上実施形態の第２の変形例に係る貯湯式給湯システムの構成図。The block diagram of the hot water storage type hot-water supply system which concerns on the 2nd modification of embodiment same as the above. 本発明の第２の実施形態に係る貯湯式給湯システムの構成図。The block diagram of the hot water storage type hot-water supply system which concerns on the 2nd Embodiment of this invention. 従来の貯湯式給湯システムの構成図。The block diagram of the conventional hot water storage type hot-water supply system.

（第１の実施形態）
本発明の第１の実施形態に係る貯湯式給湯システム（以下、給湯システムと記す）について、図１を参照して説明する。給湯システム１は、給水と加熱された湯を貯留する貯湯タンク２と、貯湯タンク２の水を加熱するヒートポンプ（加熱源）３と、ヒートポンプ３等の動作を制御する制御部４と、貯湯タンク２中の高温湯を給湯する高温給湯管５と、貯湯タンク２中の湯と給水との混合湯を給湯する混合給湯管６とを備えている。ここで、高温湯は概ね７５℃以上であり、混合湯は概ね３５〜４５℃である。 (First embodiment)
A hot water storage type hot water supply system (hereinafter referred to as a hot water supply system) according to a first embodiment of the present invention will be described with reference to FIG. A hot water supply system 1 includes a hot water storage tank 2 that stores hot water and heated hot water, a heat pump (heating source) 3 that heats water in the hot water storage tank 2, a control unit 4 that controls the operation of the heat pump 3, and the like, and a hot water storage tank 2 is provided with a hot water supply pipe 5 for supplying hot water in the hot water 2 and a mixed hot water pipe 6 for supplying hot water mixed with hot water in the hot water storage tank 2. Here, the hot water is approximately 75 ° C. or higher, and the mixed hot water is approximately 35 to 45 ° C.

貯湯タンク２は、側壁に上部から下部にかけて、複数の温度センサ２１を有しており、制御部４は、温度センサ２１が検出した湯温から貯湯タンク２内の湯量を検知する。貯湯タンク２の下層部は、給水を行なう給水管７１に接続されている。また、貯湯タンク２の下層部は、配管７２を介してヒートポンプ３と接続されており、貯湯タンク２の下層の水がヒートポンプ３で加熱される。ヒートポンプ３は、加熱した湯を貯湯タンク２に送るポンプ３１を有している。ヒートポンプ３は、貯湯タンク２の上層部と配管７３を介して接続されており、加熱した湯を貯湯タンク２の上層部に供給する。   The hot water storage tank 2 has a plurality of temperature sensors 21 on the side wall from the upper part to the lower part, and the control unit 4 detects the amount of hot water in the hot water storage tank 2 from the hot water temperature detected by the temperature sensor 21. The lower layer portion of the hot water storage tank 2 is connected to a water supply pipe 71 that supplies water. Further, the lower layer portion of the hot water storage tank 2 is connected to the heat pump 3 via the pipe 72, and the lower layer water of the hot water storage tank 2 is heated by the heat pump 3. The heat pump 3 has a pump 31 that sends heated hot water to the hot water storage tank 2. The heat pump 3 is connected to the upper layer portion of the hot water storage tank 2 via a pipe 73 and supplies heated hot water to the upper layer portion of the hot water storage tank 2.

貯湯タンク２の上層部は、高温給湯配管５を介して高温給湯口５１と接続されており、高温給湯管５には管中の湯温を検出する温度センサ５２が設けられている。高温給湯管５の高温給湯口５１付近から、高温給湯管５中の湯を貯湯タンク２に返湯するための高温返湯管５３が分岐しており、高温返湯管５３の途中には送湯ポンプ５４が設けられている。   The upper layer portion of the hot water storage tank 2 is connected to a high temperature hot water supply port 51 via a high temperature hot water supply pipe 5, and the high temperature hot water supply pipe 5 is provided with a temperature sensor 52 for detecting the temperature of the hot water in the pipe. A high temperature return pipe 53 for returning hot water in the high temperature hot water supply pipe 5 to the hot water storage tank 2 is branched from the vicinity of the high temperature hot water supply pipe 51 of the high temperature hot water supply pipe 5. A hot water pump 54 is provided.

混合給湯管６は、高温給湯管５から分岐した高温出湯管６１と、貯湯タンク２の中層部の湯を取り出す中温出湯管６２と、高温出湯管６１と中温出湯管６２とを接続する三方弁６３と、三方弁６３に接続されている混合弁入湯管６４と、給水管７１から分岐した混合弁入水管６５と、混合弁入湯管６４からの混合湯と混合弁入水管６５からの給水とを混合する混合弁６６と、混合弁６６と混合給湯口６７とを接続する混合湯管６８とを有している。高温出湯管６１は、高温給湯管５から分岐せずに貯湯タンク２の上層部に接続されていてもよい。混合湯管６８には管中の湯温を検出する温度センサ６９が設けられている。混合湯管６８の混合給湯口６７付近から、混合湯管６８中の湯を貯湯タンク２に返湯するための混合返湯管８１が分岐しており、混合返湯管８１の途中には送湯ポンプ８２が設けられている。送湯ポンプ５４及び送湯ポンプ８２は、停止時に管内の湯が逆流しない構成になっている。   The mixed hot water supply pipe 6 includes a high temperature hot water supply pipe 61 branched from the high temperature hot water supply pipe 5, a medium temperature hot water supply pipe 62 for taking out hot water in the middle layer of the hot water storage tank 2, and a three-way valve that connects the high temperature hot water supply pipe 61 and the intermediate temperature hot water supply pipe 62. 63, a mixing valve hot water pipe 64 connected to the three-way valve 63, a mixing valve water inlet pipe 65 branched from the water supply pipe 71, a mixed hot water from the mixing valve hot water pipe 64, and a water supply from the mixing valve water inlet pipe 65 And a mixing hot water pipe 68 that connects the mixing valve 66 and the mixing hot water supply port 67. The high temperature hot water supply pipe 61 may be connected to the upper layer portion of the hot water storage tank 2 without branching from the high temperature hot water supply pipe 5. The mixed hot water pipe 68 is provided with a temperature sensor 69 for detecting the hot water temperature in the pipe. A mixed hot water pipe 81 for returning hot water in the mixed hot water pipe 68 to the hot water storage tank 2 is branched from the vicinity of the mixed hot water inlet 67 of the mixed hot water pipe 68. A hot water pump 82 is provided. The hot-water supply pump 54 and the hot-water supply pump 82 are configured such that hot water in the pipe does not flow backward when stopped.

次に、給湯システム１の動作について説明する。高温給湯口５１が開かれると、給水管７１からの給水が給水圧によって貯湯タンク２の下層部に入り、貯湯タンク２の上層部の高温湯が押し上げられて高温給湯管５を通って高温給湯口５１より給湯される。混合給湯口６７が開かれると、制御部４は、ユーザが制御盤（図示せず）によって設定した混合湯の設定温度が、貯湯タンク２の中層部の湯温よりも高い場合は三方弁６３を高温出湯管６１側に切替え、貯湯タンク２の中層部の湯温よりも低い場合は三方弁６３を中温出湯管６２側に切替える。切替えられた出湯管からの湯と混合弁入水管６５からの給水とが給水圧によって混合弁６６へ送られ、混合湯となって混合湯管６８を通り混合給湯口６７より給湯される。このとき、制御部４は、温度センサ６９が検出した混合湯の湯温が、設定温度になるように混合弁入湯管６４からの湯と混合弁入水管６５からの給水の混合割合を混合弁６６によって調整する。混合湯の湯温が低い場合には、混合弁入湯管６４からの湯の混合割合を大きくし、混合湯の湯温が高い場合には、混合弁入水管６５からの給水の混合割合を大きくする。   Next, the operation of the hot water supply system 1 will be described. When the high temperature hot water supply port 51 is opened, the water supplied from the water supply pipe 71 enters the lower layer of the hot water storage tank 2 by the water supply pressure, and the high temperature hot water in the upper layer of the hot water storage tank 2 is pushed up and passes through the high temperature hot water supply pipe 5. Hot water is supplied from the mouth 51. When the mixed hot water supply port 67 is opened, the control unit 4 determines that the three-way valve 63 is set when the set temperature of the mixed hot water set by the user through the control panel (not shown) is higher than the hot water temperature in the middle layer of the hot water storage tank 2. Is switched to the high temperature hot water discharge pipe 61 side, and when the temperature is lower than the hot water temperature in the middle layer of the hot water storage tank 2, the three-way valve 63 is switched to the intermediate temperature hot water discharge pipe 62 side. The hot water from the switched hot water outlet pipe and the feed water from the mixing valve inlet pipe 65 are sent to the mixing valve 66 by the feed water pressure, and mixed hot water is supplied from the mixed hot water outlet 67 through the mixed hot water pipe 68. At this time, the control unit 4 mixes the mixing ratio of the hot water from the mixing valve hot water pipe 64 and the feed water from the mixing valve water pipe 65 so that the hot water temperature of the mixed hot water detected by the temperature sensor 69 becomes the set temperature. 66. When the hot water temperature of the mixed hot water is low, the mixing ratio of the hot water from the mixing valve hot water pipe 64 is increased, and when the hot water temperature of the mixed hot water is high, the mixing ratio of the feed water from the mixing valve water inlet pipe 65 is increased. To do.

また、制御部４は、温度センサ２１が検出した湯温に基づいて貯湯タンク２内の湯量が所定量より少ないと判断すると、ポンプ３１を駆動し貯湯タンク２の下層部の給水を、配管７２を通して吸引し、ヒートポンプ３で加熱して配管７３を通して貯湯タンク２の上層部に供給する。制御部４は、貯湯タンク２内の湯量が所定量に増加するまで、ポンプ３１の駆動と給水の加熱を続ける。   When the control unit 4 determines that the amount of hot water in the hot water storage tank 2 is less than a predetermined amount based on the hot water temperature detected by the temperature sensor 21, the control unit 4 drives the pump 31 to supply water in the lower layer of the hot water storage tank 2. And is heated by the heat pump 3 and supplied to the upper layer portion of the hot water storage tank 2 through the pipe 73. The control unit 4 continues to drive the pump 31 and heat the supplied water until the amount of hot water in the hot water storage tank 2 increases to a predetermined amount.

また、温度センサ５２が検出した高温給湯管５中の湯温が所定の温度より低くなると、送湯ポンプ５４が駆動される。高温給湯管５中の湯が高温返湯管５３を介して貯湯タンク２の中層部に返され、貯湯タンク２の上層部の高温湯が高温給湯管５に送られて高温給湯管５及び高温返湯管５３中の湯が循環する。温度センサ５２が検出する湯温が所定の温度より高くなると送湯ポンプ５４の駆動が停止される。このようにして、高温給湯管５中の湯温が常に所定の温度以上になるので、高温給湯口５１を開くと直ぐに高温湯が出湯される。   When the hot water temperature in the high temperature hot water supply pipe 5 detected by the temperature sensor 52 becomes lower than a predetermined temperature, the hot water supply pump 54 is driven. Hot water in the high temperature hot water supply pipe 5 is returned to the middle layer of the hot water storage tank 2 through the high temperature hot water return pipe 53, and high temperature hot water in the upper layer of the hot water storage tank 2 is sent to the high temperature hot water supply pipe 5. Hot water in the return pipe 53 is circulated. When the hot water temperature detected by the temperature sensor 52 becomes higher than a predetermined temperature, the drive of the hot water supply pump 54 is stopped. In this way, the hot water temperature in the high temperature hot water supply pipe 5 is always equal to or higher than the predetermined temperature, so that when the high temperature hot water supply port 51 is opened, the high temperature hot water is discharged immediately.

また、温度センサ６９が検出した混合湯管６８中の湯温が所定の温度より低くなると、送湯ポンプ８２が駆動され、混合湯管６８中の湯が混合返湯管８１を介して貯湯タンク２の中層部に返される。この中層部に返される湯によって、貯湯タンク２の上層部の高温湯が高温出湯管６１から、中層部の中温湯が中温出湯管６２から、図中の矢印Ａの経路に沿って三方弁６３、混合弁入湯管６４を介して混合弁６６に送湯される。また、下層部の水が給水管７１から、図中の矢印Ｂの経路に沿って混合弁入水管６５を介して混合弁６６に送湯される。このとき、制御部４は、混合湯の設定温度に応じて、高温出湯管６１と、中温出湯管６２とのいずれかの出湯管に三方弁６３を切替える。また、制御部４は、温度センサ６９が検出する混合湯の湯温が、設定温度になるように、混合弁入湯管６４からの湯と混合弁入水管６５からの給水の混合割合を混合弁６６によって調整する。   Further, when the hot water temperature in the mixed hot water pipe 68 detected by the temperature sensor 69 becomes lower than a predetermined temperature, the hot water supply pump 82 is driven and the hot water in the mixed hot water pipe 68 passes through the mixed hot water pipe 81. Returned to the middle layer of 2. By the hot water returned to the middle layer, the high temperature hot water in the upper layer of the hot water storage tank 2 comes from the high temperature hot water discharge pipe 61 and the middle temperature hot water from the middle temperature hot water discharge pipe 62 passes along the path indicated by the arrow A in the figure. Then, hot water is fed to the mixing valve 66 through the mixing valve hot water pipe 64. Further, the water in the lower layer is fed from the water supply pipe 71 to the mixing valve 66 through the mixing valve inlet pipe 65 along the path indicated by the arrow B in the figure. At this time, the control unit 4 switches the three-way valve 63 to one of the hot water discharge pipe 61 and the medium temperature hot water discharge pipe 62 according to the set temperature of the mixed hot water. In addition, the control unit 4 sets the mixing ratio of the mixing ratio of the hot water from the mixing valve inlet pipe 64 and the supply water from the mixing valve inlet pipe 65 so that the hot water temperature of the mixed hot water detected by the temperature sensor 69 becomes the set temperature. 66.

温度センサ６９が検出する湯温が混合湯の設定温度になると送湯ポンプ８２の駆動を停止する。このようにして、混合湯管６８中の湯温が常に設定温度になるので、混合給湯口６７を開くと直ぐに設定温度の混合湯が出湯されるので利便性が良くなる。また、湯水を無駄にすることがない。また、湯温の不足分に応じて高温湯を使用するので、エネルギーの無駄がない。   When the hot water temperature detected by the temperature sensor 69 reaches the set temperature of the mixed hot water, the drive of the hot water supply pump 82 is stopped. In this way, the hot water temperature in the mixed hot water pipe 68 always becomes the set temperature, so that the mixed hot water at the set temperature is immediately discharged when the mixed hot water supply port 67 is opened, so that convenience is improved. Moreover, hot water is not wasted. Moreover, since hot water is used according to the lack of hot water temperature, there is no waste of energy.

（第１の変形例）
次に、本実施形態の第１の変形例について図２を参照して説明する。本変形例では、混合湯管６８中の混合湯の返湯先が実施形態と異なっている。混合返湯管８１は、貯湯タンク２に接続されずに混合弁入水管６５に接続されている。送湯ポンプ８２が駆動されると、混合湯管６８中の湯の一部は、図中の矢印Ｃの経路に沿って混合返湯管８１と混合弁入水管６５とを介して混合弁６６に送湯される。混合湯管６８中の湯の残りは、図中の矢印Ｄの経路に沿って混合返湯管８１、混合弁入水管６５、給水管７１を介して貯湯タンク２の下層部に送湯され、高温出湯管６１又は中温出湯管６２を通って三方弁６３、混合弁入湯管６４を介して混合弁６６に送湯される。制御部４は、温度センサ６９が検出する混合湯の湯温が、設定温度になるように、混合弁入湯管６４からの湯と混合弁入水管６５からの給水の混合割合を混合弁６６によって調整する。 (First modification)
Next, a first modification of the present embodiment will be described with reference to FIG. In this modification, the hot water return destination of the mixed hot water in the mixed hot water pipe 68 is different from that of the embodiment. The mixed hot water return pipe 81 is not connected to the hot water storage tank 2 but connected to the mixing valve water intake pipe 65. When the hot water supply pump 82 is driven, a part of the hot water in the mixed hot water pipe 68 is mixed with the mixing valve 66 via the mixed hot water pipe 81 and the mixing valve water inlet pipe 65 along the path indicated by the arrow C in the drawing. Hot water is sent to. The remaining hot water in the mixed hot water pipe 68 is sent to the lower layer of the hot water storage tank 2 through the mixed hot water pipe 81, the mixing valve water pipe 65, and the water supply pipe 71 along the path indicated by the arrow D in the figure. Hot water is supplied to the mixing valve 66 through the three-way valve 63 and the mixing valve hot water inlet pipe 64 through the high temperature hot water outlet pipe 61 or the intermediate temperature hot water outlet pipe 62. The control unit 4 uses the mixing valve 66 to change the mixing ratio of the hot water from the mixing valve inlet pipe 64 and the feed water from the mixing valve inlet pipe 65 so that the hot water temperature of the mixed hot water detected by the temperature sensor 69 becomes the set temperature. adjust.

このようにして、第１の実施形態と同様に混合湯管６８中の湯温が常に設定温度になるので、第１の実施形態と同様の効果を得ることができる。また、循環で発生する返湯の一部を混合弁６６に入れる水として利用することにより、返湯は水よりも温度が高いので、混合湯を設定温度にするために必要な高温の湯量を少なくすることが可能となり、貯湯タンク２に貯めている高温湯の使用を少なくすることができる。また、混合返湯管８１が貯湯タンク２に接続されずに混合弁入水管６５に接続されるので、混合返湯管８１の長さが短くなり、低コストになる。   In this manner, the hot water temperature in the mixed hot water pipe 68 is always set to the set temperature as in the first embodiment, so that the same effect as in the first embodiment can be obtained. Further, by using a part of the returned hot water generated in the circulation as water to be put into the mixing valve 66, the returned hot water has a temperature higher than that of the water. Therefore, the amount of hot water required to bring the mixed hot water to the set temperature is reduced. Therefore, it is possible to reduce the amount of hot water stored in the hot water storage tank 2. In addition, since the mixed hot water pipe 81 is connected to the mixed valve water pipe 65 without being connected to the hot water storage tank 2, the length of the mixed hot water pipe 81 is shortened and the cost is reduced.

（第２の変形例）
次に、本実施形態の第２の変形例について図３を参照して説明する。本変形例では、混合湯管６８中の混合湯の返湯先が実施形態と異なっている。混合返湯管８１は、混合湯の返湯先を切替える第２三方弁８３を有し、第２三方弁８３を介して貯湯タンク２の中層部に繋がる返湯中温管８４と給水管７１に繋がる返湯低温管８５とに分岐している。返湯中温管８４は、配管８６によって混合弁入水管６５に接続されている。返湯中温管８４と返湯低温管８５には、貯湯タンク２及び給水管７１からの逆流を防止する逆止弁８７、８７が設けられている。また、混合弁入水管６５に開閉弁８８が設けられている。第２三方弁８３は、返湯される混合湯の湯温に基づいて、返湯先を返湯中温管８４又は返湯低温管８５に切替える。 (Second modification)
Next, a second modification of the present embodiment will be described with reference to FIG. In this modification, the hot water return destination of the mixed hot water in the mixed hot water pipe 68 is different from that of the embodiment. The mixed hot water return pipe 81 has a second three-way valve 83 for switching the hot water return destination of the mixed hot water. The hot water supply intermediate temperature pipe 84 and the water supply pipe 71 connected to the middle layer of the hot water storage tank 2 through the second three-way valve 83 are provided. It branches off to a connected hot water cryogenic pipe 85. The returning hot water intermediate pipe 84 is connected to the mixing valve inlet pipe 65 by a pipe 86. The return hot water intermediate pipe 84 and the return hot water cold pipe 85 are provided with check valves 87 and 87 for preventing a back flow from the hot water storage tank 2 and the water supply pipe 71. An opening / closing valve 88 is provided in the mixing valve inlet pipe 65. The second three-way valve 83 switches the hot water destination to the hot water intermediate temperature pipe 84 or the hot water cold pipe 85 based on the hot water temperature of the mixed hot water to be returned.

次に、給湯システム１の動作について説明する。温度センサ６９が検出した混合湯管６８中の湯温が所定の温度より低くなると送湯ポンプ８２が駆動される。このとき、混合湯管６８中の湯温が、第２三方弁８３を切替える予め定められた基準温度より高い場合には、第２三方弁８３は返湯中温管８４の方に切替えられる。このとき、給水管７１から混合弁入水管６５への送湯を防止するために開閉弁８８が閉じられる。混合湯管６８中の混合湯の一部は、混合返湯管８１、第２三方弁８３を通り、以降、図中の矢印Ｅに沿って配管８６、混合弁入水管６５を介して混合弁６６に送湯される。混合湯管６８中の混合湯の残りは、混合返湯管８１、第２三方弁８３を通り、以降、図中の矢印Ｆに沿って、返湯中温管８４を介して貯湯タンク２の中層部に送湯され、高温出湯管６１又は中温出湯管６２を通って三方弁６３、混合弁入湯管６４を介して混合弁６６に送湯される。このとき、貯湯タンク２から給水管７１、混合弁入水管６５を介して混合弁６６へ送湯される経路は開閉弁８８によって閉じられる。   Next, the operation of the hot water supply system 1 will be described. When the hot water temperature in the mixed hot water pipe 68 detected by the temperature sensor 69 becomes lower than a predetermined temperature, the hot water supply pump 82 is driven. At this time, when the hot water temperature in the mixed hot water pipe 68 is higher than a predetermined reference temperature for switching the second three-way valve 83, the second three-way valve 83 is switched to the hot water intermediate temperature pipe 84. At this time, the on-off valve 88 is closed in order to prevent hot water supply from the water supply pipe 71 to the mixing valve inlet pipe 65. A part of the mixed hot water in the mixed hot water pipe 68 passes through the mixed return hot water pipe 81 and the second three-way valve 83, and thereafter, the mixed valve passes through the pipe 86 and the mixed valve water inlet pipe 65 along the arrow E in the figure. The hot water is sent to 66. The remainder of the mixed hot water in the mixed hot water pipe 68 passes through the mixed hot water return pipe 81 and the second three-way valve 83, and thereafter, the middle layer of the hot water storage tank 2 through the hot water intermediate hot pipe 84 along the arrow F in the figure. The hot water is fed to the hot water outlet pipe 61 or the intermediate hot water hot water pipe 62 and fed to the mixing valve 66 via the three-way valve 63 and the mixing valve hot water pipe 64. At this time, the path for supplying hot water from the hot water storage tank 2 to the mixing valve 66 through the water supply pipe 71 and the mixing valve inlet pipe 65 is closed by the on-off valve 88.

混合湯管６８中の湯温が、第２三方弁８３を切替える予め定められた基準温度より低い場合には、第２三方弁８３は返湯低温管８５の方に切替えられる。このとき、開閉弁８８は開かれる。混合湯管６８中の混合湯の一部は、混合返湯管８１、第２三方弁８３を通り、以降、図中の矢印Ｇに沿って返湯低温管８５、給水管７１、混合弁入水管６５を介して混合弁６６に送湯される。混合湯管６８中の混合湯の残りは、混合返湯管８１、第２三方弁８３、返湯低温管８５、給水管７１を介して貯湯タンク２の下層部に送湯され、高温出湯管６１又は中温出湯管６２を通って三方弁６３、混合弁入湯管６４を介して混合弁６６に送湯される。制御部４は、温度センサ６９が検出する混合湯の湯温が、設定温度になるように、混合弁入湯管６４からの湯と混合弁入水管６５からの給水の混合割合を混合弁６６によって調整する。   When the hot water temperature in the mixed hot water pipe 68 is lower than a predetermined reference temperature for switching the second three-way valve 83, the second three-way valve 83 is switched to the hot water cold pipe 85. At this time, the on-off valve 88 is opened. Part of the mixed hot water in the mixed hot water pipe 68 passes through the mixed hot water return pipe 81 and the second three-way valve 83, and thereafter, along the arrow G in the figure, the hot water return cold pipe 85, the water supply pipe 71, and the mixing valve enter. Hot water is fed to the mixing valve 66 through the water pipe 65. The remainder of the mixed hot water in the mixed hot water pipe 68 is sent to the lower layer of the hot water storage tank 2 through the mixed hot water pipe 81, the second three-way valve 83, the hot water cold pipe 85, and the water supply pipe 71, and the hot hot water pipe. The hot water is fed to the mixing valve 66 through the three-way valve 63 and the mixing valve hot water pipe 64 through 61 or the medium temperature hot water pipe 62. The control unit 4 uses the mixing valve 66 to change the mixing ratio of the hot water from the mixing valve inlet pipe 64 and the feed water from the mixing valve inlet pipe 65 so that the hot water temperature of the mixed hot water detected by the temperature sensor 69 becomes the set temperature. adjust.

このようにして、第１の実施形態と同様に混合湯管６８中の湯温が常に設定温度になるので、第１の実施形態と同様の効果を得ることができる。また、混合湯管６８中の混合湯の温度に応じて返湯先を貯湯タンク２の中層部か給水管７１のいずれかに切替えるので、貯湯タンク２中の湯温分布が乱されず温度成層が維持され易く、高温湯、中温湯を効率良く出湯することができる。   In this manner, the hot water temperature in the mixed hot water pipe 68 is always set to the set temperature as in the first embodiment, so that the same effect as in the first embodiment can be obtained. Further, since the hot water return destination is switched to either the middle layer of the hot water storage tank 2 or the water supply pipe 71 in accordance with the temperature of the mixed hot water in the mixed hot water pipe 68, the temperature stratification is not disturbed. Is easily maintained, and hot and medium hot water can be discharged efficiently.

（第２の実施形態）
本発明の第２の実施形態に係る給湯システムについて、図４を参照して説明する。本実施形態では、高温給湯管５中の高温湯と混合湯管６８中の混合湯の返湯を同一の配管で行う。混合返湯管８１は、湯の貯湯タンク２への返湯元を混合湯管６８又は高温給湯管５から分岐した高温返湯管５３のいずれかに切替える第３三方弁８９を有している。温度センサ５２が検出した高温給湯管５中の湯温が所定の温度より低くなると、第３三方弁８９が高温返湯管５３の方に切替えられ、送湯ポンプ８２が駆動される。高温給湯管５中の湯が高温返湯管５３、第３三方弁８９、混合返湯管８１を介して貯湯タンク２の中層部に返される。温度センサ６９が検出した混合湯管６８中の湯温が所定の温度より低くなると、第３三方弁８９が混合返湯管８１の方に切替えられ、送湯ポンプ８２が駆動され、混合湯管６８中の湯が混合返湯管８１、第３三方弁８９を介して貯湯タンク２の中層部に返される。このように、高温給湯管５中の高温湯と混合湯管６８中の混合湯の返湯を同一の配管で行うので低コストになる。このような高温給湯管５中の高温湯と混合湯管６８中の混合湯の返湯を同一の配管で行う構成を上述した第１の実施形態の各変形例に適用してもよい。 (Second Embodiment)
A hot water supply system according to a second embodiment of the present invention will be described with reference to FIG. In the present embodiment, the hot water in the hot water supply pipe 5 and the mixed hot water in the mixed hot water pipe 68 are returned by the same pipe. The mixed hot water return pipe 81 has a third three-way valve 89 that switches the hot water return source to the hot water storage tank 2 to either the mixed hot water pipe 68 or the high temperature hot water supply pipe 53 branched from the high temperature hot water supply pipe 5. When the hot water temperature in the high temperature hot water supply pipe 5 detected by the temperature sensor 52 becomes lower than a predetermined temperature, the third three-way valve 89 is switched to the high temperature hot water return pipe 53 and the hot water supply pump 82 is driven. Hot water in the high temperature hot water supply pipe 5 is returned to the middle layer portion of the hot water storage tank 2 through the high temperature hot water return pipe 53, the third three-way valve 89, and the mixed hot water return pipe 81. When the hot water temperature in the mixed hot water pipe 68 detected by the temperature sensor 69 becomes lower than a predetermined temperature, the third three-way valve 89 is switched to the mixed hot water pipe 81, the hot water supply pump 82 is driven, and the mixed hot water pipe is driven. The hot water in 68 is returned to the middle layer of the hot water storage tank 2 through the mixed hot water return pipe 81 and the third three-way valve 89. Thus, since the hot water in the hot water supply pipe 5 and the hot water in the mixed hot water pipe 68 are returned by the same pipe, the cost is reduced. Such a configuration in which the hot water in the hot water supply pipe 5 and the mixed hot water in the mixed hot water pipe 68 are returned by the same pipe may be applied to each modification of the first embodiment described above.

なお、本発明は、上記実施形態の構成に限られず、発明の趣旨を変更しない範囲で種々の変形が可能である。例えば、混合湯管６８中の湯温に基づかずに、時間によって送湯ポンプ８２を駆動させて混合湯管６８中の湯と貯湯タンク２中の湯を循環させてもよい。また、第１の実施形態において、高温返湯管５３や送湯ポンプ５４を備えずに高温湯の返湯を行わないようにしてもよい。   In addition, this invention is not restricted to the structure of the said embodiment, A various deformation | transformation is possible in the range which does not change the meaning of invention. For example, instead of being based on the hot water temperature in the mixed hot water pipe 68, the hot water supply pump 82 may be driven according to time to circulate the hot water in the mixed hot water pipe 68 and the hot water in the hot water storage tank 2. In the first embodiment, the high temperature hot water return pipe 53 and the hot water supply pump 54 are not provided, and the hot water may not be returned.

１ 貯湯式給湯システム
２ 貯湯タンク
３ ヒートポンプ（加熱源）
４ 制御部
５ 高温給湯管
６ 混合給湯管
６１ 高温出湯管
６２ 中温出湯管
６３ 三方弁
６４ 混合弁入湯管
６５ 混合弁入水管
６６ 混合弁
６８ 混合湯管
７１ 給水管
８１ 混合返湯管
８２ 送湯ポンプ
８３ 第２三方弁
８４ 返湯中温管
８５ 返湯低温管
８６ 配管
８９ 第３三方弁 1 Hot water storage hot water supply system 2 Hot water storage tank 3 Heat pump (heating source)
4 Control unit 5 High temperature hot water supply pipe 6 Mixed hot water supply pipe 61 High temperature hot water discharge pipe 62 Medium temperature hot water supply pipe 63 Three-way valve 64 Mixing valve hot water pipe 65 Mixed valve hot water pipe 66 Mixing valve 68 Mixed hot water pipe 71 Hot water pipe 81 Mixed hot water pipe 82 Hot water supply Pump 83 Second three-way valve 84 Return hot water intermediate pipe 85 Return hot water cold pipe 86 Pipe 89 Third three way valve

Claims (4)

給水管に接続され給水と加熱された湯を貯留する貯湯タンクと、前記貯湯タンクの水を加熱する加熱源と、前記加熱源の動作を制御する制御部と、前記貯湯タンクの高温湯を給湯する高温給湯管と、前記貯湯タンクの高温湯又は中温湯と前記給水管からの給水とを混合した混合湯を給湯する混合給湯管と、即湯するために前記混合給湯管中の湯を前記貯湯タンクに戻す混合返湯管と、を備えた貯湯式給湯システムにおいて、
前記混合給湯管は、前記貯湯タンクの上層部又は前記高温給湯管に接続された高温出湯管と、前記貯湯タンクの中層部に接続された中温出湯管と、前記高温出湯管と中温出湯管とを接続する三方弁と、前記三方弁に接続され送湯する混合弁入湯管と、前記給水管から分岐した混合弁入水管と、前記混合弁入湯管からの湯と混合弁入水管からの給水とを混合する混合弁と、この混合弁による混合湯を出湯する混合湯管と、を有し、
前記混合返湯管は、前記混合湯管から分岐して前記貯湯タンクの中温部である中層部に接続されており、前記混合湯管中の湯を前記貯湯タンクに送湯する送湯ポンプを有していることを特徴とする貯湯式給湯システム。 A hot water storage tank connected to the water supply pipe for storing the hot water and heated water, a heating source for heating the water in the hot water storage tank, a controller for controlling the operation of the heating source, and hot water for the hot water storage tank A hot water supply pipe that supplies hot water mixed with hot water or hot water in the hot water storage tank mixed with hot water supplied from the water supply pipe, and hot water in the mixed hot water pipe for immediate hot water. In a hot water storage type hot water supply system equipped with a mixed hot water return pipe returning to a hot water storage tank,
The mixed hot water pipe includes a high temperature hot water pipe connected to an upper layer part of the hot water storage tank or the high temperature hot water pipe, an intermediate hot water pipe connected to a middle part of the hot water tank, the high temperature hot water pipe and an intermediate hot water pipe, A three-way valve connecting the three-way valve, a mixing valve inlet pipe connected to the three-way valve for feeding hot water, a mixing valve inlet pipe branched from the water supply pipe, hot water from the mixing valve inlet pipe and water supply from the mixing valve inlet pipe And a mixing hot water pipe for discharging mixed hot water by the mixing valve,
The mixed hot water pipe is branched from the mixed hot water pipe and connected to an intermediate layer which is an intermediate temperature part of the hot water storage tank, and a hot water supply pump for feeding hot water in the mixed hot water pipe to the hot water storage tank is provided. A hot water storage hot water supply system characterized by having. 給水管に接続され給水と加熱された湯を貯留する貯湯タンクと、前記貯湯タンクの水を加熱する加熱源と、前記加熱源の動作を制御する制御部と、前記貯湯タンクの高温湯を給湯する高温給湯管と、前記貯湯タンクの高温湯又は中温湯と前記給水管からの給水とを混合した混合湯を給湯する混合給湯管と、即湯するために前記混合給湯管中の湯を前記貯湯タンクに戻す混合返湯管と、を備えた貯湯式給湯システムにおいて、
前記混合給湯管は、前記貯湯タンクの上層部又は前記高温給湯管に接続された高温出湯管と、前記貯湯タンクの中層部に接続された中温出湯管と、前記高温出湯管と中温出湯管とを接続する三方弁と、前記三方弁に接続され送湯する混合弁入湯管と、前記給水管から分岐した混合弁入水管と、前記混合弁入湯管からの湯と混合弁入水管からの給水とを混合する混合弁と、この混合弁による混合湯を出湯する混合湯管と、を有し、
前記混合返湯管は、前記混合湯管から分岐して前記貯湯タンクに接続されずに前記混合弁入水管に接続され、前記混合湯管中の湯を前記混合弁入水管に送湯する送湯ポンプを有していることを特徴とする貯湯式給湯システム。 A hot water storage tank connected to the water supply pipe for storing the hot water and heated water, a heating source for heating the water in the hot water storage tank, a controller for controlling the operation of the heating source, and hot water for the hot water storage tank A hot water supply pipe that supplies hot water mixed with hot water or hot water in the hot water storage tank mixed with hot water supplied from the water supply pipe, and hot water in the mixed hot water pipe for immediate hot water. In a hot water storage type hot water supply system equipped with a mixed hot water return pipe returning to a hot water storage tank,
The mixed hot water pipe includes a high temperature hot water pipe connected to an upper layer part of the hot water storage tank or the high temperature hot water pipe, an intermediate hot water pipe connected to a middle part of the hot water tank, the high temperature hot water pipe and an intermediate hot water pipe, A three-way valve connecting the three-way valve, a mixing valve inlet pipe connected to the three-way valve for feeding hot water, a mixing valve inlet pipe branched from the water supply pipe, hot water from the mixing valve inlet pipe and water supply from the mixing valve inlet pipe And a mixing hot water pipe for discharging mixed hot water by the mixing valve,
The mixed hot water pipe is branched from the mixed hot water pipe and connected to the mixing valve water inlet pipe without being connected to the hot water storage tank, and the hot water in the mixed hot water pipe is fed to the mixed valve water inlet pipe. A hot water storage hot water supply system characterized by having a hot water pump. 給水管に接続され給水と加熱された湯を貯留する貯湯タンクと、前記貯湯タンクの水を加熱する加熱源と、前記加熱源の動作を制御する制御部と、前記貯湯タンクの高温湯を給湯する高温給湯管と、前記貯湯タンクの高温湯又は中温湯と前記給水管からの給水とを混合した混合湯を給湯する混合給湯管と、即湯するために前記混合給湯管中の湯を前記貯湯タンクに戻す混合返湯管と、を備えた貯湯式給湯システムにおいて、
前記混合給湯管は、前記貯湯タンクの上層部又は前記高温給湯管に接続された高温出湯管と、前記貯湯タンクの中層部に接続された中温出湯管と、前記高温出湯管と中温出湯管とを接続する三方弁と、前記三方弁に接続され送湯する混合弁入湯管と、前記給水管から分岐した混合弁入水管と、前記混合弁入湯管からの湯と混合弁入水管からの給水とを混合する混合弁と、この混合弁による混合湯を出湯する混合湯管と、を有し、
前記混合返湯管は、前記混合湯管から分岐し、混合湯の返湯先を切替える第２三方弁を介して前記貯湯タンクに繋がる返湯中温管と前記給水管に繋がる返湯低温管とに分岐し、前記混合湯管中の湯を前記返湯中温管又は返湯低温管に送湯する送湯ポンプを有し、
前記返湯中温管が前記混合弁入水管に配管によって接続されていることを特徴とする貯湯式給湯システム。 A hot water storage tank connected to the water supply pipe for storing the hot water and heated water, a heating source for heating the water in the hot water storage tank, a controller for controlling the operation of the heating source, and hot water for the hot water storage tank A hot water supply pipe that supplies hot water mixed with hot water or hot water in the hot water storage tank mixed with hot water supplied from the water supply pipe, and hot water in the mixed hot water pipe for immediate hot water. In a hot water storage type hot water supply system equipped with a mixed hot water return pipe returning to a hot water storage tank,
The mixed hot water pipe includes a high temperature hot water pipe connected to an upper layer part of the hot water storage tank or the high temperature hot water pipe, an intermediate hot water pipe connected to a middle part of the hot water tank, the high temperature hot water pipe and an intermediate hot water pipe, A three-way valve connecting the three-way valve, a mixing valve inlet pipe connected to the three-way valve for feeding hot water, a mixing valve inlet pipe branched from the water supply pipe, hot water from the mixing valve inlet pipe and water supply from the mixing valve inlet pipe And a mixing hot water pipe for discharging mixed hot water by the mixing valve,
The mixed hot water pipe branches from the mixed hot water pipe, and a hot water intermediate temperature pipe connected to the hot water storage tank via a second three-way valve that switches a hot water return destination of the mixed hot water, and a hot water cold pipe connected to the water supply pipe, A hot water supply pump for branching the hot water in the mixed hot water pipe to the hot water intermediate temperature pipe or the hot water cold pipe,
The hot water storage hot water supply system characterized in that the hot water return intermediate temperature pipe is connected to the mixing valve inlet pipe by piping. 前記混合返湯管は、湯の貯湯タンクへの返湯元を前記混合湯管又は高温給湯管から分岐した高温返湯管のいずれかに切替える第３三方弁を有したことを特徴とする請求項１乃至請求項３のいずれか１項に記載の貯湯式給湯システム。   The said mixed hot water pipe has a 3rd three-way valve which switches the hot water return source to the hot water storage tank to either the said mixed hot water pipe or the high temperature hot water pipe branched from the high temperature hot water supply pipe. The hot water storage type hot water supply system according to any one of claims 1 to 3.
JP2009266957A 2009-11-25 2009-11-25 Hot water storage hot water supply system Expired - Fee Related JP5457803B2 (en)

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