JP5655724B2 - Hot water storage water heater - Google Patents

Hot water storage water heater Download PDF

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JP5655724B2
JP5655724B2 JP2011149385A JP2011149385A JP5655724B2 JP 5655724 B2 JP5655724 B2 JP 5655724B2 JP 2011149385 A JP2011149385 A JP 2011149385A JP 2011149385 A JP2011149385 A JP 2011149385A JP 5655724 B2 JP5655724 B2 JP 5655724B2
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flow path
hot water
water storage
switching means
path switching
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JP2013015290A (en
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泰成 松村
泰成 松村
尚希 渡邉
尚希 渡邉
真行 須藤
真行 須藤
康史 本庄
康史 本庄
柳本　圭
圭 柳本
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Mitsubishi Electric Corp
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Description

本発明は、貯湯式給湯機に関し、特に、ヒートポンプ等の加熱装置を備えた貯湯式給湯機に関する。   The present invention relates to a hot water storage type water heater, and more particularly, to a hot water storage type water heater provided with a heating device such as a heat pump.

従来技術として、例えば特許文献１に記載されているように、ヒートポンプ等の加熱装置と、水の流路を切換える２つの流路切換弁とを備えた貯湯式給湯機が知られている。従来技術では、必要に応じて両方の流路切換弁を一緒に作動させることにより、給湯機の運転形態を制御し、水を沸上げる沸上運転や加熱対象水を加熱する加熱運転を実行する。   As a conventional technique, for example, as described in Patent Document 1, a hot water storage type hot water heater including a heating device such as a heat pump and two flow path switching valves that switch a flow path of water is known. In the prior art, by operating both flow path switching valves together as necessary, the operation mode of the water heater is controlled, and a boiling operation for boiling water and a heating operation for heating water to be heated are executed. .

特開２０１０−２２３４５１号公報JP 2010-223451 A

従来技術では、上述したように、両方の流路切換弁を一緒に作動させる（切換える）ことにより、給湯機の運転形態を制御する場合がある。しかしながら、従来技術では、このような場合において、２つの流路切換弁の作動順序（切換順序）が規定されていないため、作動順序によっては給湯温度が変動したり、加熱装置に流入する水の温度（入水温度）が変動するという問題がある。   In the prior art, as described above, there are cases where the operation mode of the water heater is controlled by operating (switching) both the flow path switching valves together. However, according to the prior art, in such a case, the operation order (switching order) of the two flow path switching valves is not prescribed. Therefore, depending on the operation order, the hot water supply temperature fluctuates or the water flowing into the heating device changes. There is a problem that the temperature (incoming water temperature) fluctuates.

本発明は、上述のような課題を解決するためになされたもので、２つの流路切換手段を一緒に作動させるときに、給湯温度や加熱装置の入水温度が変動するのを抑制し、水温を安定させることが可能な貯湯式給湯機を提供することを目的とする。   The present invention has been made to solve the above-described problems. When the two flow path switching means are operated together, the hot water supply temperature and the incoming water temperature of the heating device are suppressed, and the water temperature An object of the present invention is to provide a hot water storage type water heater capable of stabilizing the temperature.

本発明に係る貯湯式給湯機は、熱源から熱が供給される沸上げ用熱交換器を有し、沸上げ用熱交換器を流通する水を加熱する加熱装置と、加熱装置により加熱した温水を貯留する貯湯タンクと、貯湯タンクに貯留した温水及び加熱装置により加熱した温水の熱を利用して加熱対象水を加熱する利用側熱交換器と、貯湯タンクの下部、利用側熱交換器の流出側及び沸上げ用熱交換器の流入側に個別に接続された３つのポートを有する流路切換手段であって、貯湯タンクの下部と沸上げ用熱交換器の流入側とを連通する第１流路形態と、利用側熱交換器の流出側と沸上げ用熱交換器の流入側とを連通する第２流路形態と、３つのポート間を相互に連通する第３流路形態のうち、何れか１つの流路形態を選択することが可能な第１の流路切換手段と、貯湯タンクの上部及び下部と沸上げ用熱交換器の流入側及び流出側とに個別に接続された４つのポートを有し、貯湯タンクの上部に接続されたポートが利用側熱交換器の流入側にも接続された流路切換手段であって、沸上げ用熱交換器の流出側と貯湯タンクの上部とを連通する第１流路形態と、沸上げ用熱交換器の流出側と貯湯タンクの下部とを連通する第２流路形態と、第１の流路切換手段の流出側と貯湯タンクの下部とを連通する第３流路形態のうち、何れか１つの流路形態を選択することが可能な第２の流路切換手段と、第１の流路切換手段と沸上げ用熱交換器の流入側とを接続する流路に設けられたポンプであって、吸込側が第１の流路切換手段に接続され、吐出側が沸上げ用熱交換器の流入側及び第２の流路切換手段に接続された循環ポンプと、第１，第２の流路切換手段の切換動作を実行し、貯湯式給湯機の運転形態を複数の運転形態間で移行する制御手段と、第１，第２の流路切換手段を一緒に切換えて運転形態を移行する場合に、運転形態の移行後における少なくとも一方の流路切換手段の流路形態に応じて、第１，第２の流路切換手段の切換順序を変更する切換順序可変手段と、を備える。

The hot water storage type water heater according to the present invention has a boiling heat exchanger to which heat is supplied from a heat source, a heating device for heating water flowing through the boiling heat exchanger, and hot water heated by the heating device A hot water storage tank that stores water, a hot water stored in the hot water storage tank and a use side heat exchanger that heats the water to be heated using the heat of the hot water heated by the heating device, a lower part of the hot water storage tank, A flow path switching means having three ports individually connected to the outflow side and the inflow side of the boiling heat exchanger, wherein the lower part of the hot water storage tank communicates with the inflow side of the boiling heat exchanger. A first flow path configuration, a second flow path configuration communicating the outflow side of the use side heat exchanger and the inflow side of the boiling heat exchanger, and a third flow path configuration communicating between the three ports. A first channel switching means capable of selecting one of the channel configurations; It has four ports individually connected to the upper and lower parts of the hot water tank and the inflow side and outflow side of the boiling heat exchanger, and the port connected to the upper part of the hot water tank is the inflow of the use side heat exchanger A flow path switching means connected to the side, wherein the first flow path configuration communicates the outflow side of the boiling heat exchanger and the upper part of the hot water storage tank, the outflow side of the boiling heat exchanger and the hot water storage Either one of the second flow path forms communicating with the lower part of the tank or the third flow path form communicating between the outflow side of the first flow path switching means and the lower part of the hot water storage tank is selected. And a pump provided in a flow path connecting the first flow path switching means, the first flow path switching means and the inflow side of the boiling heat exchanger, the suction side being the first The discharge side is connected to the inflow side of the boiling heat exchanger and the second flow path switching means. A circulation pump, first, executes the switching operation of the second channel switching means, and control means to migrate the operating configuration of the hot-water storage type water heater between a plurality of operation mode, first, second flow path when migrating an operating mode by switching the switching means together, depending on the flow path forms at least one flow path switching means after the transition operation mode, first, the switching order of the second channel switching means Switching order changing means for changing .

本発明によれば、２つの流路切換手段を一緒に切換える場合には、少なくとも一方の流路切換手段の切換後の形態に応じて切換順序を適切に変化させることができる。これにより、給湯機の運転形態の移行時には、給湯温度が変動したり、加熱装置の入水温度が変動するのを抑制し、水温を安定させることができる。   According to the present invention, when two flow path switching means are switched together, the switching order can be appropriately changed according to the mode after switching of at least one flow path switching means. Thereby, at the time of the transition of the operation mode of the water heater, it is possible to suppress the fluctuation of the hot water supply temperature or the fluctuation of the incoming water temperature of the heating device, and to stabilize the water temperature.

本発明の実施の形態１において、貯湯式給湯機を示す全体構成図である。In Embodiment 1 of this invention, it is a whole block diagram which shows the hot water storage type water heater. バイパス運転時の回路構成を示す動作説明図である。It is operation | movement explanatory drawing which shows the circuit structure at the time of a bypass driving | operation. 沸上単独運転時の回路構成を示す動作説明図である。It is operation | movement explanatory drawing which shows the circuit structure at the time of boiling-up independent operation. 沸上追焚き同時運転時の回路構成を示す動作説明図である。It is operation | movement explanatory drawing which shows the circuit structure at the time of boiling-up chasing simultaneous operation. 追焚単独運転時の回路構成を示す動作説明図である。It is operation | movement explanatory drawing which shows the circuit structure at the time of memorial single operation. 本発明の実施の形態１において、流路切換弁の切換順序を制御するための処理を示すフローチャートである。In Embodiment 1 of this invention, it is a flowchart which shows the process for controlling the switching order of a flow-path switching valve. 本発明の実施の形態１の制御により給湯機の運転状態を切換える場合の中間状態を示す動作説明図である。It is operation | movement explanatory drawing which shows the intermediate | middle state in the case of switching the driving | running state of a water heater by control of Embodiment 1 of this invention. 本発明の実施の形態２において、流路切換弁の切換順序を制御するための処理を示すフローチャートである。In Embodiment 2 of this invention, it is a flowchart which shows the process for controlling the switching order of a flow-path switching valve. 本発明の実施の形態２の制御により給湯機の運転状態を切換える場合の中間状態を示す動作説明図である。It is operation | movement explanatory drawing which shows the intermediate | middle state in the case of switching the driving | running state of a water heater by control of Embodiment 2 of this invention.

実施の形態１．
以下、図１乃至図７を参照して、本発明の実施の形態１について説明する。なお、各図においては、共通する要素に同一の符号を付し、重複する説明を省略するものとする。図１は、本発明の実施の形態１において、貯湯式給湯機を示す全体構成図である。この図に示すように、貯湯式給湯機１００は、貯湯タンクユニット１と、ヒートポンプユニット６０とを備えている。これらのユニット１，６０は、ヒートポンプ入口配管４１とヒートポンプ出口配管４２とにより相互に接続されている。また、貯湯タンクユニット１には、制御手段としての制御部７０が搭載されており、制御部７０は、ユニット１，６０に搭載された各種の弁機構、ポンプ等を制御するように構成されている。以下、貯湯タンクユニット１及びヒートポンプユニット６０の構成について説明する。 Embodiment 1 FIG.
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS. In each drawing, common elements are denoted by the same reference numerals, and redundant description is omitted. FIG. 1 is an overall configuration diagram showing a hot water storage type hot water heater in Embodiment 1 of the present invention. As shown in this figure, the hot water storage type hot water heater 100 includes a hot water storage tank unit 1 and a heat pump unit 60. These units 1 and 60 are connected to each other by a heat pump inlet pipe 41 and a heat pump outlet pipe 42. Further, the hot water tank unit 1 is equipped with a control unit 70 as a control means, and the control unit 70 is configured to control various valve mechanisms, pumps and the like mounted on the units 1 and 60. Yes. Hereinafter, the structure of the hot water storage tank unit 1 and the heat pump unit 60 will be described.

まず、ヒートポンプユニット６０は、貯湯タンクユニット１から導かれた低温水を加熱する（沸上げる）加熱装置を構成するものである。ヒートポンプユニット６０は、圧縮機６１、沸上げ用熱交換器６２、膨張弁６３、空気熱交換器６４等を備えており、これらの機器は冷媒循環配管６５を介して環状に接続され、冷凍サイクル（ヒートポンプサイクル）を構成している。沸上げ用熱交換器６２は、冷媒循環配管６５を流れる冷媒（熱源）と貯湯タンクユニット１から流入する低温水との間で熱交換を行い、冷媒により加熱した高温水を貯湯タンクユニット１に向けて流出させる。また、ＨＰ出口側サーミスタ６６は、沸上げ用熱交換器６２で加熱した高温水の温度を検知するための温度センサーであり、ヒートポンプ出口配管４２に設けられている。   First, the heat pump unit 60 constitutes a heating device that heats (boils) the low-temperature water led from the hot water storage tank unit 1. The heat pump unit 60 includes a compressor 61, a boiling heat exchanger 62, an expansion valve 63, an air heat exchanger 64, and the like. These devices are connected in a ring shape via a refrigerant circulation pipe 65, and are connected to a refrigeration cycle. (Heat pump cycle). The boiling heat exchanger 62 exchanges heat between the refrigerant (heat source) flowing through the refrigerant circulation pipe 65 and the low temperature water flowing in from the hot water storage tank unit 1, and the high temperature water heated by the refrigerant is supplied to the hot water storage tank unit 1. Let it flow out. The HP outlet side thermistor 66 is a temperature sensor for detecting the temperature of the high-temperature water heated by the boiling heat exchanger 62, and is provided in the heat pump outlet pipe 42.

一方、貯湯タンクユニット１には、以下の各種部品や配管などが搭載されている。貯湯タンク１０は、ヒートポンプユニット６０により加熱した温水を貯留するものである。貯湯タンク１０は、第１下部１１、第２下部１２及び第３下部１３を有し、第３下部１３には、市水を供給するための給水配管２が減圧弁３を介して接続されている。また、貯湯タンク１０の上部には、タンク内に湯水を導入することが可能な後述のタンク上部配管４３が接続されている。これにより、貯湯タンク１０には、ヒートポンプユニット６０により加熱された高温水が上部から流入すると共に、給水配管２から供給される低温水が第３下部１３から流入し、上部と下部とで温度差が生じるように湯水が貯留される。また、貯湯タンク１０の表面には、高さ方向の異なる位置に残湯サーミスタ１６，１７が取り付けられており、これらのサーミスタ１６，１７は、貯湯タンク１０内の湯水の温度分布を検出する。制御部７０は、残湯サーミスタ１６、１７により検出した温度分布に基いて、貯湯タンク１０内の残湯量を把握し、ヒートポンプユニット６０により貯湯タンク１０内の湯水を沸上げる沸き上げ運転の開始及び停止などを制御する。   On the other hand, the following various parts and piping are mounted on the hot water storage tank unit 1. The hot water storage tank 10 stores hot water heated by the heat pump unit 60. The hot water storage tank 10 has a first lower part 11, a second lower part 12 and a third lower part 13, and a water supply pipe 2 for supplying city water is connected to the third lower part 13 via a pressure reducing valve 3. Yes. In addition, a tank upper pipe 43 (described later) capable of introducing hot water into the tank is connected to the upper part of the hot water storage tank 10. As a result, the hot water heated by the heat pump unit 60 flows into the hot water storage tank 10 from above, and the low temperature water supplied from the water supply pipe 2 flows from the third lower portion 13, resulting in a temperature difference between the upper portion and the lower portion. Hot water is stored so as to occur. Further, remaining hot water thermistors 16 and 17 are attached to the surface of the hot water storage tank 10 at different positions in the height direction, and these thermistors 16 and 17 detect the temperature distribution of the hot water in the hot water storage tank 10. Based on the temperature distribution detected by the remaining hot water thermistors 16 and 17, the control unit 70 grasps the amount of hot water in the hot water storage tank 10, and starts the boiling operation for boiling the hot water in the hot water storage tank 10 by the heat pump unit 60. Control stop etc.

また、貯湯タンクユニット１内には、循環ポンプ２１及び利用側熱交換器２２が内蔵されている。循環ポンプ２１は、貯湯タンクユニット１内に配置された後述の各配管に湯水を循環させるものである。利用側熱交換器２２は、貯湯タンク１０に貯留した高温水やヒートポンプユニット６０により加熱した高温水の熱を利用して、２次側の加熱対象水（浴槽循環水や暖房用循環水など）を加熱するものである。なお、本実施の形態では、利用側熱交換器２２の２次側に接続する構成として、浴槽５０内の湯水を循環させる浴槽水循環回路５１を例に挙げて説明する。浴槽水循環回路５１の途中には、利用側熱交換器２２と、浴槽水を循環させる２次側循環ポンプ５２とが接続されている。また、浴槽水循環回路５１には、浴槽５０から流出した浴槽水の温度を検出する浴槽出口側サーミスタ５３が設けられている。   The hot water storage tank unit 1 includes a circulation pump 21 and a use side heat exchanger 22. The circulation pump 21 circulates hot water through pipes, which will be described later, arranged in the hot water storage tank unit 1. The use-side heat exchanger 22 uses the heat of the high-temperature water stored in the hot water storage tank 10 or the high-temperature water heated by the heat pump unit 60 to heat the water to be heated on the secondary side (tub circulation water, heating circulation water, etc.). Is to heat. In the present embodiment, a bathtub water circulation circuit 51 that circulates hot water in the bathtub 50 will be described as an example of a configuration that is connected to the secondary side of the use side heat exchanger 22. In the middle of the bathtub water circulation circuit 51, a use side heat exchanger 22 and a secondary side circulation pump 52 for circulating the bathtub water are connected. The bathtub water circulation circuit 51 is provided with a bathtub outlet side thermistor 53 that detects the temperature of the bathtub water flowing out of the bathtub 50.

次に、貯湯タンクユニット１に搭載された弁機構、配管等について説明する。貯湯タンクユニット１は、第１の流路切換手段としての流路切換弁３３と、第２の流路切換手段としての流路切換弁３４とを備えている。第１の流路切換弁３３は、電磁駆動式の三方弁等により構成され、３つのポートａ，ｂ，ｃを有している。これらのポートａ，ｂ，ｃは、後述の各配管により貯湯タンク１０の第１下部１１、利用側熱交換器２２の流出側及び沸上げ用熱交換器６２の流入側に個別に接続されている。そして、第１の流路切換弁３３は、制御部７０から入力される信号に応じて切換えられ、ポートａ−ｃ間を連通する第１流路形態（ａ−ｃ経路）と、ポートｂ−ｃ間を連通する第２流路形態（ｂ−ｃ経路）と、３つのポートａ−ｂ−ｃ間を相互に連通する第３流路形態（ａ−ｂ−ｃ経路）のうち、何れか１つの流路形態を選択する。   Next, the valve mechanism, piping, etc. mounted on the hot water storage tank unit 1 will be described. The hot water storage tank unit 1 includes a flow path switching valve 33 as a first flow path switching means and a flow path switching valve 34 as a second flow path switching means. The first flow path switching valve 33 is configured by an electromagnetically driven three-way valve or the like, and has three ports a, b, and c. These ports a, b, and c are individually connected to the first lower portion 11 of the hot water storage tank 10, the outflow side of the use side heat exchanger 22, and the inflow side of the boiling heat exchanger 62 by pipes described later. Yes. The first flow path switching valve 33 is switched according to a signal input from the control unit 70, and the first flow path form (ac path) communicating between the ports ac and the port b- Any of a second flow path form (bc path) that communicates with each other and a third flow path form (abc path) that communicates between the three ports abc One channel configuration is selected.

第２の流路切換弁３４は、電磁駆動式の四方弁等により構成され、４つのポートａ，ｂ，ｃ，ｄを有している。これらのポートａ，ｂ，ｃ，ｄは、後述の各配管により、貯湯タンク１０の上部及び第２下部１２と、沸上げ用熱交換器６２の流入側及び流出側とに個別に接続されている。また、貯湯タンク１０の上部に接続されたポートａは、利用側熱交換器２２の流入側にも接続されている。そして、第２の流路切換弁３４は、制御部７０から入力される信号に応じて切換えられ、ポートａ−ｂ間を連通する第１流路形態（ａ−ｂ経路）と、ポートｂ−ｃ間を連通する第２流路形態（ｂ−ｃ経路）と、ポートｃ−ｄ間を相互に連通する第３流路形態（ｃ−ｄ経路）のうち、何れか１つの流路形態を選択する。   The second flow path switching valve 34 is configured by an electromagnetically driven four-way valve or the like, and has four ports a, b, c, and d. These ports a, b, c, and d are individually connected to the upper part and the second lower part 12 of the hot water storage tank 10 and the inflow side and the outflow side of the boiling heat exchanger 62 by pipes described later. Yes. The port a connected to the upper part of the hot water storage tank 10 is also connected to the inflow side of the use side heat exchanger 22. The second flow path switching valve 34 is switched in accordance with a signal input from the control unit 70, and a first flow path configuration (ab path) communicating between the ports ab and the port b- Any one of the second flow path configuration (bc route) that communicates with c and the third flow channel configuration (cd route) that communicates between ports cd with each other. select.

また、貯湯タンクユニット１は、タンク下部配管４０、ヒートポンプ入口配管４１、ヒートポンプ出口配管４２、タンク上部配管４３、追焚き配管３５、タンク下部戻し配管４４、加熱水流入配管４５及び加熱水戻し配管４６を有している。これらの配管は、貯湯タンクユニット１内を流れる水の流路を構成している。詳しく述べると、タンク下部配管４０は、貯湯タンク１０の第１下部１１と第１の流路切換弁３３のポートａとを接続している。ヒートポンプ入口配管４１は、第１の流路切換弁３３のポートｃとヒートポンプユニット６０（沸上げ用熱交換器６２）の流入側とを接続し、ヒートポンプ出口配管４２は、沸上げ用熱交換器６２の流出側と第２の流路切換弁３４のポートｂとを接続している。   The hot water storage tank unit 1 includes a tank lower pipe 40, a heat pump inlet pipe 41, a heat pump outlet pipe 42, a tank upper pipe 43, a reheating pipe 35, a tank lower return pipe 44, a heating water inflow pipe 45 and a heating water return pipe 46. have. These pipes constitute a flow path of water flowing in the hot water storage tank unit 1. More specifically, the tank lower pipe 40 connects the first lower part 11 of the hot water storage tank 10 and the port a of the first flow path switching valve 33. The heat pump inlet pipe 41 connects the port c of the first flow path switching valve 33 and the inflow side of the heat pump unit 60 (boiling heat exchanger 62), and the heat pump outlet pipe 42 is a boiling heat exchanger. The outflow side of 62 and the port b of the second flow path switching valve 34 are connected.

タンク上部配管４３は、第２の流路切換弁３４のポートａと貯湯タンク１０の上部とを接続している。また、タンク上部配管４３の途中には、後述の給湯配管５が分岐する接続部４７が設けられている。追焚き配管３５は、一端が第２の流路切換弁３４のポートｄに接続されている。追焚き配管３５の他端は、ヒートポンプ入口配管４１の途中に接続され、ヒートポンプ入口配管４１の一部を介して沸上げ用熱交換器６２の流入側に接続されている。また、タンク下部戻し配管４４は、第２の流路切換弁３４のポートｃと貯湯タンク１０の第２下部１２とを接続している。   The tank upper pipe 43 connects the port a of the second flow path switching valve 34 and the upper part of the hot water storage tank 10. Further, a connecting portion 47 where a hot water supply pipe 5 described later branches is provided in the middle of the tank upper pipe 43. One end of the tracking pipe 35 is connected to the port d of the second flow path switching valve 34. The other end of the tracking pipe 35 is connected in the middle of the heat pump inlet pipe 41 and is connected to the inflow side of the boiling heat exchanger 62 through a part of the heat pump inlet pipe 41. The tank lower return pipe 44 connects the port c of the second flow path switching valve 34 and the second lower part 12 of the hot water storage tank 10.

加熱水流入配管４５は、一端が接続部４８でタンク上部配管４３の途中に接続されている。即ち、加熱水流入配管４５は、給湯配管５の接続部４７よりも第２の流路切換弁３４に近い接続部４８において、タンク上部配管４３から分岐している。そして、加熱水流入配管４５の他端は、利用側熱交換器２２の流入側に接続されている。一方、加熱水戻し配管４６は、利用側熱交換器２２の流出側と第１の流路切換弁３３のポートｂとを接続している。加熱水流入配管４５及び加熱水戻し配管４６は、利用側熱交換器２２を介してタンク上部配管４３と第１の流路切換弁３３のポートｂとを接続する加熱水流路を構成している。また、このような各配管の接続において、循環ポンプ２１は、ヒートポンプ入口配管４１と追焚き配管３５との接続部よりも第１の流路切換弁３３に近い位置でヒートポンプ入口配管４１の途中に設けられている。これにより、循環ポンプ２１は、吸込側が第１の流路切換弁３３のポートｃに接続され、吐出側が沸上げ用熱交換器６２の流入側及び第２の流路切換弁３４のポートｄに接続されている。   One end of the heated water inflow pipe 45 is connected to the tank upper pipe 43 at one end at the connection portion 48. That is, the heated water inflow pipe 45 branches from the tank upper pipe 43 at the connection portion 48 that is closer to the second flow path switching valve 34 than the connection portion 47 of the hot water supply pipe 5. The other end of the heated water inflow pipe 45 is connected to the inflow side of the use side heat exchanger 22. On the other hand, the heating water return pipe 46 connects the outflow side of the use side heat exchanger 22 and the port b of the first flow path switching valve 33. The heated water inflow pipe 45 and the heated water return pipe 46 constitute a heated water flow path that connects the tank upper pipe 43 and the port b of the first flow path switching valve 33 via the use side heat exchanger 22. . Further, in such connection of each pipe, the circulation pump 21 is located in the middle of the heat pump inlet pipe 41 at a position closer to the first flow path switching valve 33 than the connection portion between the heat pump inlet pipe 41 and the reheating pipe 35. Is provided. Thereby, the circulation pump 21 is connected to the port c of the first flow path switching valve 33 on the suction side, and to the inflow side of the heat exchanger 62 for boiling and the port d of the second flow path switching valve 34 on the discharge side. It is connected.

さらに、貯湯タンクユニット１は、給湯配管５、給水分岐管６、給湯混合弁２９、ふろ混合弁３０、混合水給湯管３１及び浴槽水給湯管３２を備えている。給湯配管５は、貯湯タンク１０に貯留した湯水を給湯機の外部に供給するための流路である。給湯配管５の一端は、タンク上部配管４３の接続部４７に接続され、タンク上部配管４３の一部を介して貯湯タンク１０の上部に接続されている。給湯配管５の他端は、湯側配管として給湯混合弁２９及びふろ混合弁３０に接続されている。また、給水分岐管６は、減圧弁３を介して給水配管２から分岐し、水側配管として給湯混合弁２９及びふろ混合弁３０に接続されている。給湯混合弁２９とふろ混合弁３０は、給湯配管５から供給される高温水と給水分岐管６から供給される低温水との流量比を調整し、両者が混合された温水の温度を給湯機のリモコン等により設定された設定温度に調整するものである。そして、給湯混合弁２９により温度調整された温水は、混合水給湯管３１を流通し、ユーザが使用するシャワーやカランの蛇口等に供給される。また、ふろ混合弁３０により温度調整された温水は、浴槽水給湯管３２を介して浴槽水循環回路５１に流入し、浴槽５０に供給される。   Further, the hot water storage tank unit 1 includes a hot water supply pipe 5, a water supply branch pipe 6, a hot water supply mixing valve 29, a bath mixing valve 30, a mixed water hot water supply pipe 31, and a bathtub water hot water supply pipe 32. The hot water supply pipe 5 is a flow path for supplying hot water stored in the hot water storage tank 10 to the outside of the water heater. One end of the hot water supply pipe 5 is connected to the connection portion 47 of the tank upper pipe 43 and is connected to the upper part of the hot water storage tank 10 through a part of the tank upper pipe 43. The other end of the hot water supply pipe 5 is connected to the hot water supply mixing valve 29 and the bath mixing valve 30 as a hot water side pipe. The water supply branch pipe 6 branches from the water supply pipe 2 via the pressure reducing valve 3 and is connected to the hot water supply mixing valve 29 and the bath mixing valve 30 as water side pipes. The hot water supply mixing valve 29 and the bath mixing valve 30 adjust the flow rate ratio between the high temperature water supplied from the hot water supply pipe 5 and the low temperature water supplied from the water supply branch pipe 6, and the temperature of the hot water in which both are mixed is a water heater. The temperature is adjusted to a set temperature set by a remote controller or the like. Then, the hot water whose temperature is adjusted by the hot water supply mixing valve 29 flows through the mixed water hot water supply pipe 31 and is supplied to a shower used by the user, a faucet of a currant, and the like. Further, the hot water whose temperature is adjusted by the bath mixing valve 30 flows into the bathtub water circulation circuit 51 through the bathtub water hot water supply pipe 32 and is supplied to the bathtub 50.

このように構成される給湯機の動作は、制御部７０により制御される。制御部７０は、給湯機の作動状態やユーザ等による各種設定の状態等に応じて、流路切換弁３３，３４の切換動作を実行し、給湯機の運転形態を切換える。以下、図２乃至図５を参照しつつ、給湯機の運転形態の例について説明する。なお、図２乃至図５では、各運転形態の実行時に、これと並行して給湯配管５から外部に給湯する場合を例示している。   The operation of the water heater configured as described above is controlled by the control unit 70. The control unit 70 performs the switching operation of the flow path switching valves 33 and 34 according to the operation state of the water heater, the state of various settings by the user, etc., and switches the operation mode of the water heater. Hereinafter, an example of the operation mode of the water heater will be described with reference to FIGS. 2 to 5. 2 to 5 exemplify a case where hot water is supplied from the hot water supply pipe 5 to the outside in parallel with the operation modes.

（バイパス運転）
図２は、バイパス運転時の回路構成を示す動作説明図である。バイパス運転は、ヒートポンプユニット６０と貯湯タンク１０の下部との間で温水を循環しつつ、給湯機を待機状態に保持するものである。バイパス運転時には、第１の流路切換弁３３が第１流路形態（ａ−ｃ経路）に保持され、第２の流路切換弁３４が第２流路形態（ｂ−ｃ経路）に保持される。これにより、第１の流路切換弁３３は、貯湯タンク１０の第１下部１１と沸上げ用熱交換器６２の流入側と連通し、第２の流路切換弁３４は、沸上げ用熱交換器６２の流出側と貯湯タンク１０の第２下部１２とを連通した状態となる。そして、ヒートポンプユニット６０及び循環ポンプ２１が作動する。この結果、貯湯タンク１０の第１下部１１から流出した水は、配管４０，４１及び第１の流路切換弁３３を介して沸上げ用熱交換器６２に流入し、当該交換器内で加熱されて温水となる。そして、この温水は、沸上げ用熱交換器６２から流出し、配管４２，４４及び第２の流路切換弁３４を介して貯湯タンク１０の第２下部１２に流入する。 (Bypass operation)
FIG. 2 is an operation explanatory diagram illustrating a circuit configuration during bypass operation. In the bypass operation, hot water is circulated between the heat pump unit 60 and the lower part of the hot water storage tank 10, and the hot water heater is held in a standby state. During the bypass operation, the first flow path switching valve 33 is held in the first flow path form (ac path), and the second flow path switching valve 34 is held in the second flow path form (bc path). Is done. Thereby, the first flow path switching valve 33 communicates with the first lower portion 11 of the hot water storage tank 10 and the inflow side of the boiling heat exchanger 62, and the second flow path switching valve 34 is heated by the boiling heat. The outflow side of the exchanger 62 and the second lower part 12 of the hot water storage tank 10 are in communication with each other. Then, the heat pump unit 60 and the circulation pump 21 are operated. As a result, the water flowing out from the first lower portion 11 of the hot water storage tank 10 flows into the boiling heat exchanger 62 through the pipes 40 and 41 and the first flow path switching valve 33, and is heated in the exchanger. It becomes warm water. The hot water flows out from the boiling heat exchanger 62 and flows into the second lower portion 12 of the hot water storage tank 10 through the pipes 42 and 44 and the second flow path switching valve 34.

（沸上単独運転）
図３は、沸上単独運転時の回路構成を示す動作説明図である。沸上単独運転は、ヒートポンプユニット６０により沸上げた温水を貯湯タンク１０に貯留したり、外部に給湯するものである。なお、図３では、ヒートポンプユニット６０により沸上げた温水を貯湯タンク１０内の温水と一緒に給湯する場合を例示している。沸上単独運転時には、第１の流路切換弁３３が第１流路形態（ａ−ｃ経路）に保持され、第２の流路切換弁３４が第１流路形態（ａ−ｂ経路）に保持される。これにより、第１の流路切換弁３３は、バイパス運転時と同様に機能し、第２の流路切換弁３４は、沸上げ用熱交換器６２の流出側をタンク上部配管４３（貯湯タンク１０の上部及び給湯配管５）に連通した状態となる。そして、ヒートポンプユニット６０及び循環ポンプ２１が作動する。この結果、貯湯タンク１０の第１下部１１から流出した水は、沸上げ用熱交換器６２により加熱されて温水となり、この温水は、配管４２，４３及び第２の流路切換弁３４を介して給湯配管５に流入し、外部に供給される。このとき、給湯配管５には、貯湯タンク１０からも温水が流入する。 (Boiling operation alone)
FIG. 3 is an operation explanatory diagram showing a circuit configuration at the time of boiling-only operation. In the boiling-up single operation, the hot water boiled by the heat pump unit 60 is stored in the hot water storage tank 10 or supplied to the outside. In addition, in FIG. 3, the case where the hot water boiled by the heat pump unit 60 is supplied together with the hot water in the hot water storage tank 10 is illustrated. At the time of single boiling operation, the first flow path switching valve 33 is held in the first flow path configuration (ac path), and the second flow path switching valve 34 is in the first flow path configuration (ac path). Retained. Accordingly, the first flow path switching valve 33 functions in the same manner as in the bypass operation, and the second flow path switching valve 34 connects the tank upper pipe 43 (hot water storage tank) to the outflow side of the boiling heat exchanger 62. 10 and the hot water supply pipe 5). Then, the heat pump unit 60 and the circulation pump 21 are operated. As a result, the water flowing out from the first lower portion 11 of the hot water storage tank 10 is heated by the boiling heat exchanger 62 to become hot water, and this hot water is passed through the pipes 42 and 43 and the second flow path switching valve 34. Then flows into the hot water supply pipe 5 and is supplied to the outside. At this time, hot water also flows into the hot water supply pipe 5 from the hot water storage tank 10.

一方、沸上単独運転時に給湯が行われていない場合には、給湯配管５が混合弁２９，３０により閉塞されているので、タンク上部配管４３に流入した温水は、貯湯タンク１０の上部に流入し、タンク内に貯留される。なお、タンク上部配管４３には、加熱水流入配管４５が接続されているが、沸上単独運転時には、加熱水戻し配管４６の下流側が第１の流路切換弁３３により閉塞されている。このため、第２の流路切換弁３４から流出した温水は、加熱水流入配管４５に流入することなく、タンク上部配管４３を流通する。   On the other hand, when hot water is not supplied during the boiling-only operation, the hot water supply pipe 5 is closed by the mixing valves 29 and 30, so that the hot water flowing into the tank upper pipe 43 flows into the upper part of the hot water storage tank 10. And stored in the tank. The tank upper pipe 43 is connected to the heated water inflow pipe 45, but the downstream side of the heated water return pipe 46 is closed by the first flow path switching valve 33 during the boiling-up single operation. For this reason, the hot water flowing out from the second flow path switching valve 34 flows through the tank upper pipe 43 without flowing into the heated water inflow pipe 45.

（沸上追焚き同時運転）
図４は、沸上追焚き同時運転時の回路構成を示す動作説明図である。沸上追焚き同時運転は、ヒートポンプユニット６０により沸上げた温水を利用して浴槽水を加熱（追焚き）するものである。沸上追焚き同時運転時には、第１の流路切換弁３３が第２流路形態（ｂ−ｃ経路）に保持され、第２の流路切換弁３４が第１流路形態（ａ−ｂ経路）に保持される。そして、ヒートポンプユニット６０、循環ポンプ２１及び２次側循環ポンプ５２が作動する。この状態において、第２の流路切換弁３４は、沸上単独運転時と同様に、沸上げ用熱交換器６２の流出側をタンク上部配管４３に連通している。しかし、第１の流路切換弁３３は、利用側熱交換器２２の流出側と沸上げ用熱交換器６２の流入側とを連通しており、加熱水戻し配管４６の下流側は閉塞されていないので、タンク上部配管４３に流入した温水は、加熱水流入配管４５に流入する。そして、この温水は、利用側熱交換器２２を流通して浴槽水を加熱した後に、配管４６，４１及び第１の流路切換弁３３を介して沸上げ用熱交換器６２に流入する。 (Simultaneous operation with boiling)
FIG. 4 is an operation explanatory diagram showing a circuit configuration at the time of boiling-up chasing simultaneous operation. The simultaneous boiling-up operation is for heating (chasing) the bath water using hot water boiled by the heat pump unit 60. During simultaneous boiling-up operation, the first flow path switching valve 33 is held in the second flow path configuration (bc path), and the second flow path switching valve 34 is in the first flow path configuration (ab). Route). And the heat pump unit 60, the circulation pump 21, and the secondary side circulation pump 52 operate | move. In this state, the second flow path switching valve 34 communicates the outflow side of the boiling heat exchanger 62 to the tank upper pipe 43 as in the case of the single boiling operation. However, the first flow path switching valve 33 communicates the outflow side of the use side heat exchanger 22 and the inflow side of the boiling heat exchanger 62, and the downstream side of the heating water return pipe 46 is blocked. Therefore, the hot water that has flowed into the tank upper pipe 43 flows into the heated water inflow pipe 45. The hot water flows through the use-side heat exchanger 22 and heats the bath water, and then flows into the boiling heat exchanger 62 through the pipes 46 and 41 and the first flow path switching valve 33.

（追焚単独運転）
図５は、追焚単独運転時の回路構成を示す動作説明図である。追焚単独運転は、貯湯タンク１０に貯留された温水を利用して浴槽水を加熱するものである。追焚単独運転時には、第１の流路切換弁３３が第２流路形態（ｂ−ｃ経路）に保持され、第２の流路切換弁３４が第３流路形態（ｃ−ｄ経路）に保持される。これにより、第１の流路切換弁３３は、沸上追焚き同時運転時と同様に機能し、第２の流路切換弁３４は、第１の流路切換弁３３の流出側であるポートｂと貯湯タンク１０の第２下部１２とを連通した状態となる。そして、循環ポンプ２１及び２次側循環ポンプ５２が作動する。この結果、貯湯タンク１０内の温水はタンクの上部から流出し、配管４３，４５を介して利用側熱交換器２２を流通することにより、浴槽水を加熱する。そして、この温水は配管４６，４１及び第１の流路切換弁３３を介して追焚き配管３５に流入し、更に第２の流路切換弁３４及びタンク下部戻し配管４４を介して貯湯タンク１０に戻される。 (In memorial operation)
FIG. 5 is an operation explanatory diagram illustrating a circuit configuration during the memorial single operation. The memorial single operation uses the hot water stored in the hot water storage tank 10 to heat the bathtub water. During the memorial operation alone, the first flow path switching valve 33 is held in the second flow path configuration (bc path), and the second flow path switching valve 34 is in the third flow path configuration (cd path). Retained. As a result, the first flow path switching valve 33 functions in the same manner as in the boiling-up chasing simultaneous operation, and the second flow path switching valve 34 is a port on the outflow side of the first flow path switching valve 33. b and the 2nd lower part 12 of the hot water storage tank 10 will be connected. And the circulation pump 21 and the secondary side circulation pump 52 act | operate. As a result, the hot water in the hot water storage tank 10 flows out from the upper part of the tank and flows through the use side heat exchanger 22 via the pipes 43 and 45 to heat the bath water. The hot water flows into the reheating pipe 35 via the pipes 46, 41 and the first flow path switching valve 33, and further flows into the hot water storage tank 10 via the second flow path switching valve 34 and the tank lower return pipe 44. Returned to

次に、給湯機の運転形態を移行する場合の流路切換弁３３，３４の切換順序について説明する。本実施の形態では、流路切換弁３３，３４の切換動作を一緒に実行する場合に、少なくとも一方の流路切換弁の切換後の形態に応じて流路切換弁３３，３４のうち先に切換える流路切換弁を可変とする。図６は、流路切換弁の切換順序を制御するための処理を示すフローチャートである。   Next, the switching order of the flow path switching valves 33 and 34 when shifting the operation mode of the water heater will be described. In the present embodiment, when the switching operation of the flow path switching valves 33 and 34 is performed together, the flow path switching valves 33 and 34 are preceded by the switching mode of at least one of the flow path switching valves. The flow path switching valve to be switched is variable. FIG. 6 is a flowchart showing a process for controlling the switching order of the flow path switching valves.

図６に示すルーチンにおいて、まず、Ｓ１では、給湯機の運転形態を移行するときに、両方の流路切換弁３３，３４を一緒に切換える必要があるか否かを判定する。ここで、流路切換弁３３，３４を一緒に切換える必要がないと判定した場合には、Ｓ２において、流路切換弁３３，３４の何れか一方のみを切換える単独流路切換動作を実行する。ここで、Ｓ２の具体例を挙げると、例えばバイパス運転（図２）から沸上単独運転（図３）に移行する場合には、第２の流路切換弁３４のみを第２流路形態（ｂ−ｃ経路）から第１流路形態（ａ−ｂ経路）に切換えればよいので、この場合には単独流路切換動作を実行する。   In the routine shown in FIG. 6, first, in S1, it is determined whether or not both flow path switching valves 33 and 34 need to be switched together when the operation mode of the water heater is shifted. If it is determined that there is no need to switch the flow path switching valves 33 and 34 together, a single flow path switching operation for switching only one of the flow path switching valves 33 and 34 is executed in S2. Here, to give a specific example of S2, for example, when the operation is shifted from the bypass operation (FIG. 2) to the single boiling operation (FIG. 3), only the second flow path switching valve 34 is set to the second flow path configuration ( Since it is only necessary to switch from the bc path) to the first channel form (ab path), in this case, the single channel switching operation is executed.

一方、Ｓ１において、両方の流路切換弁３３，３４を一緒に切換える必要があると判定した場合には、Ｓ３に移行し、第２の流路切換弁３４の切換後の形態が第１流路形態（ａ−ｂ経路）であるか否かを判定する。そして、Ｓ３の判定が成立した場合には、Ｓ４において、第１の流路切換弁３３の切換動作を先に実行してから、第２の流路切換弁３４の切換動作を実行する。ここで、Ｓ４の具体例を挙げると、例えばバイパス運転（図２）から沸上追焚き同時運転（図４）に移行する場合には、第１の流路切換弁３３を第１流路形態（ａ−ｃ経路）から第２流路形態（ｂ−ｃ経路）に切換えた後に、第２の流路切換弁３４を第２流路形態（ｂ−ｃ経路）から第１流路形態（ａ−ｂ経路）に切換える。この切換順序によれば、以下の作用効果を得ることができる。   On the other hand, if it is determined in S1 that both the flow path switching valves 33 and 34 need to be switched together, the process proceeds to S3, and the configuration after the switching of the second flow path switching valve 34 is the first flow. It is determined whether it is a road form (ab route). If the determination of S3 is established, the switching operation of the first flow path switching valve 33 is first performed in S4, and then the switching operation of the second flow path switching valve 34 is performed. Here, to give a specific example of S4, for example, when the operation is shifted from the bypass operation (FIG. 2) to the simultaneous boiling-up operation (FIG. 4), the first flow path switching valve 33 is set to the first flow path configuration. After switching from the (ac path) to the second flow path form (bc path), the second flow path switching valve 34 is changed from the second flow path form (bc path) to the first flow path form ( ab route). According to this switching order, the following effects can be obtained.

まず、バイパス運転時には、図２に示すように、タンク上部配管４３が使用されないので、タンク上部配管４３には、貯湯タンク１０の上部及び給湯配管５と比較して温度の異なる水（長時間放置された場合などには温度が低下した水）が滞留している場合がある。この状態で、仮に上記切換順序とは逆に、第２の流路切換弁３４を先に切換えた場合には、給湯機の運転形態が図２→図３→図４のように変化して沸上追焚き同時運転に移行する。即ち、第２の流路切換弁３４を切換えてから第１の流路切換弁３３を切換えるまでの間には、図３に示す中間状態が生じることになり、この中間状態では、ヒートポンプユニット６０から流出する温水がタンク上部配管４３に流入する。このとき、給湯配管５から外部への給湯が行われていると、タンク上部配管４３に滞留していた低温水が給湯配管５に流入し、外部に供給される湯の温度が変動する虞れがある。   First, in the bypass operation, as shown in FIG. 2, the tank upper pipe 43 is not used. Therefore, the tank upper pipe 43 includes water having different temperatures as compared with the upper part of the hot water storage tank 10 and the hot water supply pipe 5 ( In some cases, water having a decreased temperature) may remain. In this state, if the second flow path switching valve 34 is switched first, contrary to the switching order, the operation mode of the water heater changes as shown in FIG. 2 → FIG. 3 → FIG. Shift to boiling-up chasing simultaneous operation. That is, an intermediate state shown in FIG. 3 occurs between the time when the second flow path switching valve 34 is switched and the time when the first flow path switching valve 33 is switched. In this intermediate state, the heat pump unit 60 The warm water flowing out from the tank flows into the tank upper pipe 43. At this time, if hot water is supplied from the hot water supply pipe 5 to the outside, low temperature water staying in the tank upper pipe 43 may flow into the hot water supply pipe 5 and the temperature of the hot water supplied to the outside may fluctuate. There is.

これに対し、本実施の形態では、第１の流路切換弁３３を切換えてから第２の流路切換弁３４を切換えるので、給湯機の運転形態は、図２→図７→図４のように移行する。ここで、図７は、本発明の実施の形態１の制御により給湯機の運転状態を切換える場合の中間状態を示す動作説明図である。図７に示すように、第１の流路切換弁３３を先に切換えた場合には、貯湯タンク１０の上部からタンク上部配管４３を介して加熱水流入配管４５に温水が流入するので、これに伴ってタンク上部配管４３内の低温水も加熱水流入配管４５に流入する。即ち、このときに外部への給湯が行われていた場合でも、タンク上部配管４３に滞留していた低温水が給湯配管５に流入するのを防止することができる。従って、例えばバイパス運転から沸上追焚き同時運転への移行時に、給湯管３１，３２に供給される湯の温度変化を抑制し、シャワーやカラン等の給湯端末において湯温を安定させることができる。   On the other hand, in this embodiment, since the second flow path switching valve 34 is switched after the first flow path switching valve 33 is switched, the operation mode of the water heater is as shown in FIG. 2 → FIG. 7 → FIG. To migrate. Here, FIG. 7 is an operation explanatory diagram showing an intermediate state when the operation state of the water heater is switched by the control of the first embodiment of the present invention. As shown in FIG. 7, when the first flow path switching valve 33 is switched first, hot water flows from the upper part of the hot water storage tank 10 into the heated water inflow pipe 45 via the tank upper pipe 43. Accordingly, the low temperature water in the tank upper pipe 43 also flows into the heated water inflow pipe 45. That is, even when hot water supply to the outside is performed at this time, it is possible to prevent low temperature water staying in the tank upper pipe 43 from flowing into the hot water supply pipe 5. Therefore, for example, at the time of transition from the bypass operation to the boiling-up and simultaneous operation, the temperature change of the hot water supplied to the hot water supply pipes 31 and 32 can be suppressed, and the hot water temperature can be stabilized at the hot water supply terminal such as a shower or a caran. .

一方、図６において、Ｓ３の判定が不成立の場合、即ち、第２の流路切換弁３４の切換後の形態が第２流路形態（ｂ−ｃ経路）または第３流路形態（ｃ−ｄ経路）であると判定した場合には、Ｓ５に移行する。Ｓ５では、第２の流路切換弁３４の切換動作を先に実行してから、第１の流路切換弁３３の切換動作を実行する。ここで、Ｓ５の具体例を挙げると、例えば沸上追焚き同時運転（図４）からバイパス運転（図２）に移行する場合には、まず、第２の流路切換弁３４を第１流路形態（ａ−ｂ経路）から第２流路形態（ｂ−ｃ経路）に切換えた後に、第１の流路切換弁３３を第２流路形態（ｂ−ｃ経路）から第１流路形態（ａ−ｃ経路）に切換える。この切換順序によれば、給湯機の運転形態は、図４→図７→図２のように移行するので、前記Ｓ４の場合と同様の作用効果を得ることができる。   On the other hand, in FIG. 6, when the determination of S3 is not established, that is, the form after switching of the second flow path switching valve 34 is the second flow path form (bc path) or the third flow path form (c- If it is determined that it is (d route), the process proceeds to S5. In S5, after the switching operation of the second flow path switching valve 34 is executed first, the switching operation of the first flow path switching valve 33 is executed. Here, to give a specific example of S5, for example, when shifting from the simultaneous boiling-up operation (FIG. 4) to the bypass operation (FIG. 2), first, the second flow path switching valve 34 is set to the first flow. After switching from the path configuration (a-b route) to the second channel configuration (bc route), the first channel switching valve 33 is changed from the second channel configuration (bc route) to the first channel. Switch to form (ac path). According to this switching order, the operation mode of the water heater is shifted as shown in FIG. 4 → FIG. 7 → FIG. 2, so that the same effect as in the case of S4 can be obtained.

詳しく述べると、仮にＳ５の切換順序が逆であり、第１の流路切換弁３３の切換動作を先に実行した場合には、給湯機の運転形態が図４→図３→図２のように変化する。この結果、図３に示す中間状態では、沸上追焚き同時運転時に使用されていなかったタンク上部配管４３内の低温水が給湯配管５に流入する虞れがある。これに対し、Ｓ５の切換順序によれば、図７の中間状態において、タンク上部配管４３内の低温水が加熱水流入配管４５に流入する。従って、例えば沸上追焚き同時運転からバイパス運転への移行時に、給湯温度の変化を抑制することができる。   More specifically, if the switching order of S5 is reversed and the switching operation of the first flow path switching valve 33 is executed first, the operation mode of the water heater is as shown in FIG. 4 → FIG. 3 → FIG. To change. As a result, in the intermediate state shown in FIG. 3, there is a possibility that the low-temperature water in the tank upper pipe 43 that has not been used at the time of simultaneous boiling-up operation flows into the hot water supply pipe 5. On the other hand, according to the switching order in S5, the low temperature water in the tank upper pipe 43 flows into the heated water inflow pipe 45 in the intermediate state of FIG. Therefore, for example, a change in hot water supply temperature can be suppressed at the time of transition from the simultaneous boiling-up chasing operation to the bypass operation.

以上詳述した通り、本実施の形態によれば、１つの循環ポンプ２１と２つの流路切換弁３３，３４とを用いて、貯湯タンク１０内の水を沸上げる運転と加熱対象水を加熱する運転とを同時に実行することができる。また、２つの流路切換弁３３，３４を一緒に切換える場合には、第２の流路切換弁３４の切換後の形態に応じて切換順序を適切に変化させることができる。これにより、運転形態の移行時には、給湯配管５に低温水が混入するのを防止し、給湯温度の変動を抑制できるだけでなく、タンク上部配管４３から貯湯タンク１０の上部に供給される温水温度の変動も抑制することができる。   As described in detail above, according to the present embodiment, the operation of boiling the water in the hot water storage tank 10 and the heating target water are heated using the single circulation pump 21 and the two flow path switching valves 33 and 34. Can be performed at the same time. Moreover, when switching the two flow path switching valves 33 and 34 together, the switching order can be appropriately changed according to the form after the switching of the second flow path switching valve 34. Thereby, at the time of transition of the operation mode, not only the low temperature water is mixed into the hot water supply pipe 5 and the fluctuation of the hot water temperature can be suppressed, but also the temperature of the hot water supplied from the tank upper pipe 43 to the upper part of the hot water storage tank 10 Variations can also be suppressed.

なお、前記実施の形態１では、図６中に示すＳ３，Ｓ４，Ｓ５が請求項１における切換順序可変手段の具体例を示している。このうち、Ｓ３，Ｓ４は、請求項２における切換順序可変手段の具体例を示し、Ｓ３，Ｓ５は、請求項３における切換順序可変手段の具体例を示している。   In the first embodiment, S3, S4, and S5 shown in FIG. 6 are specific examples of the switching order changing means in claim 1. Among these, S3 and S4 show a specific example of the switching order changing means in claim 2, and S3 and S5 show a specific example of the switching order changing means in claim 3.

実施の形態２．
次に、図８及び図９を参照して、本発明の実施の形態２について説明する。本実施の形態は、前記実施の形態１と同様の構成及び制御（図１乃至図５）において、第１の流路切換手段の切換後の形態に応じて流路切換手段の切換順序を可変とすることを特徴としている。なお、本実施の形態では、実施の形態１と同一の構成要素に同一の符号を付し、その説明を省略するものとする。 Embodiment 2. FIG.
Next, a second embodiment of the present invention will be described with reference to FIGS. In the present embodiment, in the same configuration and control as in the first embodiment (FIGS. 1 to 5), the switching order of the flow path switching means is variable according to the mode after the switching of the first flow path switching means. It is characterized by that. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

図８は、本発明の実施の形態２において、流路切換弁の切換順序を制御するための処理を示すフローチャートである。この図において、まず、Ｓ１，Ｓ２では、実施の形態１（図６）と同様に、両方の流路切換弁３３，３４を一緒に切換える必要があるか否かを判定し、その必要がない場合には、単独流路切換動作を実行する。また、両方の流路切換弁３３，３４を一緒に切換える必要があると判定した場合には、Ｓ６に移行する。   FIG. 8 is a flowchart showing a process for controlling the switching order of the flow path switching valves in the second embodiment of the present invention. In this figure, first, in S1 and S2, as in the first embodiment (FIG. 6), it is determined whether or not both flow path switching valves 33 and 34 need to be switched together, and this is not necessary. In this case, the single flow path switching operation is executed. If it is determined that both flow path switching valves 33 and 34 need to be switched together, the process proceeds to S6.

Ｓ６では、第１の流路切換弁３３の切換後の形態が第１流路形態（ａ−ｃ経路）であるか否かを判定する。そして、Ｓ６の判定が成立した場合には、Ｓ７において、第１の流路切換弁３３の切換動作を先に実行してから、第２の流路切換弁３４の切換動作を実行する。ここで、Ｓ７の具体例を挙げると、例えば追焚単独運転（図５）からバイパス運転（図２）に移行する場合には、まず、第１の流路切換弁３３を第２流路形態（ｂ−ｃ経路）から第１流路形態（ａ−ｃ経路）に切換えた後に、第２の流路切換弁３４を第３流路形態（ｃ−ｄ経路）から第２流路形態（ｂ−ｃ経路）に切換える。この切換順序によれば、以下の作用効果を得ることができる。   In S6, it is determined whether or not the form after switching of the first flow path switching valve 33 is the first flow path form (ac path). If the determination in S6 is established, the switching operation of the first flow path switching valve 33 is first performed in S7, and then the switching operation of the second flow path switching valve 34 is performed. Here, to give a specific example of S7, for example, when shifting to the bypass operation (FIG. 2) from the chasing single operation (FIG. 5), first, the first flow path switching valve 33 is set to the second flow path configuration. After switching from the (bc path) to the first flow path configuration (ac path), the second flow path switching valve 34 is changed from the third flow path configuration (cd path) to the second flow path configuration ( bc route). According to this switching order, the following effects can be obtained.

まず、追焚単独運転時には、図５に示すように、沸上げ用熱交換器６２に対する水の流入が停止している。この状態で、仮に上記切換順序とは逆に、第２の流路切換弁３４を先に切換えた場合には、給湯機の運転形態が図５→図７→図２のように変化してバイパス運転に移行する。なお、図７は、実施の形態１で参照したものである。この結果、図５→図７の移行時には、入水が停止されていた沸上げ用熱交換器６２に対して、タンク上部からの流出水（高温水）が流入することになる。また、図７→図２の移行時には、沸上げ用熱交換器６２に流入する水がタンク上部の流出水（高温水）からタンク下部の流出水（低温水）に切換えられることになる。これらの現象は、ヒートポンプユニット６０に対する入水温度の変動（ヒートショック）を生じさせる。   First, during the memorial operation alone, the inflow of water to the boiling heat exchanger 62 is stopped as shown in FIG. In this state, if the second flow path switching valve 34 is switched first, contrary to the switching order, the operation mode of the water heater changes as shown in FIG. 5 → FIG. 7 → FIG. Transition to bypass operation. FIG. 7 is referred to in the first embodiment. As a result, at the time of transition from FIG. 5 to FIG. 7, the outflow water (high temperature water) from the upper part of the tank flows into the boiling heat exchanger 62 that has stopped entering water. 7 to FIG. 2, the water flowing into the boiling heat exchanger 62 is switched from the effluent water (high temperature water) at the upper part of the tank to the effluent water (low temperature water) at the lower part of the tank. These phenomena cause fluctuations in the incoming water temperature (heat shock) with respect to the heat pump unit 60.

これに対し、Ｓ７では、第１の流路切換弁３４を切換えてから第２の流路切換弁３３を切換えるので、給湯機の運転形態は、図５→図９→図２のように移行する。ここで、図９は、本発明の実施の形態２の制御により給湯機の運転状態を切換える場合の中間状態を示す動作説明図である。この切換順序によれば、沸上げ用熱交換器６２には、タンク下部の低温水が流入するだけとなるので、前述のヒートショックを軽減することができる。   On the other hand, in S7, since the second flow path switching valve 33 is switched after the first flow path switching valve 34 is switched, the operation mode of the water heater is shifted as shown in FIG. 5 → FIG. 9 → FIG. To do. Here, FIG. 9 is an operation explanatory diagram showing an intermediate state when the operation state of the water heater is switched by the control of the second embodiment of the present invention. According to this switching order, only the low-temperature water at the bottom of the tank flows into the boiling heat exchanger 62, so that the aforementioned heat shock can be reduced.

一方、図８において、Ｓ６の判定が不成立の場合、即ち、第１の流路切換弁３３の切換後の形態が第２流路形態（ｂ−ｃ経路）または第３流路形態（ａ−ｂ−ｃ経路）の場合には、Ｓ８に移行する。Ｓ８では、第２の流路切換弁３４の切換動作を先に実行してから、第１の流路切換弁３３の切換動作を実行する。ここで、Ｓ８の具体例を挙げると、例えば沸上単独運転（図３）から追焚単独運転（図５）に移行する場合には、第２の流路切換弁３４を第１流路形態（ａ−ｂ経路）から第３流路形態（ｃ−ｄ経路）に切換えた後に、第１の流路切換弁３３を第１流路形態（ａ−ｃ経路）から第２流路形態（ｂ−ｃ経路）に切換える。この切換順序によれば、給湯機の運転形態は、沸上単独運転から図３→図９→図５のように変化して追焚単独運転に移行するので、前記Ｓ７の場合と同様の作用効果を得ることができる。   On the other hand, in FIG. 8, when the determination of S6 is not established, that is, the form after switching of the first flow path switching valve 33 is the second flow path form (bc path) or the third flow path form (a- bc route), the process proceeds to S8. In S8, after the switching operation of the second flow path switching valve 34 is executed first, the switching operation of the first flow path switching valve 33 is executed. Here, to give a specific example of S8, for example, in the case of shifting from the boiling-only operation (FIG. 3) to the memorial operation (FIG. 5), the second flow path switching valve 34 is set to the first flow path configuration. After switching from the (a-b path) to the third flow path configuration (cd path), the first flow path switching valve 33 is changed from the first flow path configuration (ac path) to the second flow path configuration ( bc route). According to this switching order, the operation mode of the water heater changes from the boiling-up single operation as shown in FIG. 3 to FIG. 9 → FIG. An effect can be obtained.

詳しく述べると、仮にＳ８の切換順序が逆であり、第１の流路切換弁３３の切換動作を先に実行した場合には、給湯機の運転形態が図３→図４→図５のように移行する。この結果、図３→図４の移行時には、沸上げ用熱交換器６２に流入する水がタンク下部の流出水（低温水）から利用側熱交換器２２の流出水（高温水）に切換えられることになり、前述のヒートショックが生じる。これに対し、Ｓ８の切換順序によれば、沸上げ用熱交換器６２には、タンク下部の低温水が流入した後に水の流入が停止するだけとなるので、ヒートショックを軽減することができる。   More specifically, if the switching order of S8 is reversed and the switching operation of the first flow path switching valve 33 is executed first, the operation mode of the water heater is as shown in FIG. 3 → FIG. 4 → FIG. Migrate to As a result, at the time of transition from FIG. 3 to FIG. 4, the water flowing into the boiling heat exchanger 62 is switched from the effluent water (low temperature water) at the bottom of the tank to the effluent water (high temperature water) of the use side heat exchanger 22. As a result, the aforementioned heat shock occurs. On the other hand, according to the switching order of S8, since the inflow of water only stops after the low temperature water in the lower part of the tank flows into the boiling heat exchanger 62, the heat shock can be reduced. .

このように構成される本実施の形態でも、前記実施の形態１とほぼ同様の作用効果を得ることができ、第１の流路切換弁３３の切換後の形態に応じて流路切換弁３３，３４の切換順序を適切に変化させることができる。これにより、運転形態の移行時には、ヒートポンプユニット６０のヒートショックを軽減し、前記入水温度を安定させることができる。   Also in the present embodiment configured as described above, it is possible to obtain substantially the same operational effects as in the first embodiment, and the flow path switching valve 33 according to the form after the first flow path switching valve 33 is switched. , 34 can be appropriately changed. Thereby, the heat shock of the heat pump unit 60 can be reduced and the incoming water temperature can be stabilized during the transition of the operation mode.

なお、前記実施の形態２では、図８中に示すＳ６，Ｓ７，Ｓ８が請求項１における切換順序可変手段の具体例を示している。このうち、Ｓ６，Ｓ７は、請求項４における切換順序可変手段の具体例を示し、Ｓ６，Ｓ８は、請求項５における切換順序可変手段の具体例を示している。   In the second embodiment, S6, S7, and S8 shown in FIG. 8 are specific examples of the switching order changing means in claim 1. Among these, S6 and S7 show a specific example of the switching order changing means in claim 4, and S6 and S8 show a specific example of the switching order changing means in claim 5.

また、前記実施の形態１，２では、第２の流路切換弁３４を第２流路形態（ｂ−ｃ経路）から第１流路形態（ａ−ｂ経路）に切換えるときに、当該切換動作を段階的に実行する構成としてもよい。具体例を挙げると、制御部７０は、第２の流路切換弁３４に内蔵された可動部（弁体等）が第２流路形態（ｂ−ｃ経路）に対応する位置から第１流路形態（ａ−ｂ経路）に対応する位置まで移動するときの全移動範囲を５つのステップに分割し、第２の流路切換弁３４の切換時には、前記可動部を１ステップずつ５段階にわたって徐々に移動させる構成としてもよい。また、可動部の移動速度を通常の移動速度に対して半分程度に低下せせる構成としてもよい。これにより、第２の流路切換弁３４の切換動作を徐々に実行することができるので、流路の急変を防止し、給湯温度の変動をより軽減することができる。   In the first and second embodiments, when the second flow path switching valve 34 is switched from the second flow path form (bc path) to the first flow path form (ab path), the switching is performed. It is good also as a structure which performs operation | movement in steps. To give a specific example, the control unit 70 starts the first flow from the position where the movable part (valve element or the like) built in the second flow path switching valve 34 corresponds to the second flow path form (bc path). The entire movement range when moving to a position corresponding to the path form (a-b route) is divided into five steps, and when the second flow path switching valve 34 is switched, the movable part is divided into five steps step by step. It is good also as a structure which moves gradually. Moreover, it is good also as a structure which can reduce the moving speed of a movable part to about half with respect to a normal moving speed. Thereby, since the switching operation of the second flow path switching valve 34 can be executed gradually, a sudden change in the flow path can be prevented, and fluctuations in the hot water supply temperature can be further reduced.

また、前記実施の形態１，２では、制御部７０により第１の流路切換弁３３の切換動作を段階的に（徐々に）実行する構成としてもよい。具体例を挙げると、上記第２の流路切換弁３４の場合と同様に、第１の流路切換弁３３の可動部を段階的に移動させたり、当該可動部を低速で移動させればよい。これにより、給湯温度の変動やヒートポンプユニット６０に供給される湯水温度の変動をより軽減することができる。   In the first and second embodiments, the controller 70 may perform the switching operation of the first flow path switching valve 33 stepwise (gradually). As a specific example, as in the case of the second flow path switching valve 34, if the movable part of the first flow path switching valve 33 is moved stepwise or the movable part is moved at a low speed, Good. Thereby, the fluctuation | variation of the hot water supply temperature and the fluctuation | variation of the hot water temperature supplied to the heat pump unit 60 can be reduced more.

一方、前記実施の形態１では、第２の流路切換弁３４の切換後の形態に応じて各流路切換弁３３，３４の切換順序を可変とし、実施の形態２では、第１の流路切換弁３３の切換後の形態に応じて各流路切換弁３３，３４の切換順序を可変とする場合を例示した。しかし、本発明では、実施の形態１，２を組合わせることにより、２つの流路切換弁３３，３４の切換後の形態に応じて該各流路切換弁３３，３４の切換順序を可変とする構成としてもよい。   On the other hand, in the first embodiment, the switching order of the flow path switching valves 33 and 34 is made variable in accordance with the mode after the switching of the second flow path switching valve 34. In the second embodiment, the first flow path is changed. The case where the switching order of each flow path switching valve 33 and 34 is made variable according to the form after switching of the path switching valve 33 was illustrated. However, in the present invention, by combining the first and second embodiments, the switching order of the flow path switching valves 33 and 34 can be changed according to the mode after the switching of the two flow path switching valves 33 and 34. It is good also as composition to do.

また、前記実施の形態１，２では、第１，第２の流路切換手段として、それぞれ単一の流路切換弁３３，３４を用いるものとした。しかし、本発明はこれに限らず、例えば複数の弁機構を組合わせることにより１つの流路切換手段を実現してもよい。   In the first and second embodiments, the single flow path switching valves 33 and 34 are used as the first and second flow path switching means, respectively. However, the present invention is not limited to this. For example, one flow path switching unit may be realized by combining a plurality of valve mechanisms.

また、前記実施の形態１，２では、加熱対象水として浴槽水を採用し、加熱対象水を加熱する加熱運転の一例として、浴槽水を追焚きする運転（沸上追焚き同時運転及び追焚単独運転）について説明した。しかし、本発明の加熱運転はこれに限らず、例えば暖房用循環水を加熱対象水とする暖房運転であってもよい。   In the first and second embodiments, bathtub water is employed as the heating target water, and an example of a heating operation for heating the heating target water is an operation for chasing the bathtub water (both boiling chasing simultaneous operation and chasing). Independent operation was explained. However, the heating operation of the present invention is not limited to this, and may be a heating operation in which, for example, circulating water for heating is water to be heated.

また、前記実施の形態１，２では、ヒートポンプユニット６０として、冷媒の圧力が臨界圧力以上となる超臨界ヒートポンプサイクルを用いるものとしたが、例えば一般の臨界圧力以下で作動するヒートポンプサイクルを用いてもよい。この場合、冷媒としては、フロンガス、アンモニア等を用いてもよい。   In the first and second embodiments, a supercritical heat pump cycle in which the refrigerant pressure is equal to or higher than the critical pressure is used as the heat pump unit 60. For example, a heat pump cycle that operates below a general critical pressure is used. Also good. In this case, chlorofluorocarbon gas, ammonia or the like may be used as the refrigerant.

１ 貯湯タンクユニット
５ 給湯配管（給湯流路）
１０ 貯湯タンク
２１ 循環ポンプ
２２ 利用側熱交換器
３３ 第１の流路切換弁（第１の流路切換手段）
３４ 第２の流路切換弁（第２の流路切換手段）
４３ タンク上部配管（タンク上部流路）
４５ 加熱水流入配管（加熱水流路）
４６ 加熱水戻し配管（加熱水流路）
６０ ヒートポンプユニット（加熱装置）
６２ 沸上げ用熱交換器
７０ 制御部（制御手段）
１００ 貯湯式給湯機 1 Hot water storage tank unit 5 Hot water supply piping (hot water supply flow path)
DESCRIPTION OF SYMBOLS 10 Hot water storage tank 21 Circulation pump 22 Use side heat exchanger 33 1st flow-path switching valve (1st flow-path switching means)
34 Second channel switching valve (second channel switching means)
43 Tank upper piping (tank upper channel)
45 Heating water inflow piping (heating water flow path)
46 Heating water return piping (heating water flow path)
60 Heat pump unit (heating device)
62 Boiling heat exchanger 70 Control unit (control means)
100 Hot water storage water heater

Claims (7)

熱源から熱が供給される沸上げ用熱交換器を有し、前記沸上げ用熱交換器を流通する水を加熱する加熱装置と、
前記加熱装置により加熱した温水を貯留する貯湯タンクと、
前記貯湯タンクに貯留した温水及び前記加熱装置により加熱した温水の熱を利用して加熱対象水を加熱する利用側熱交換器と、
前記貯湯タンクの下部、前記利用側熱交換器の流出側及び前記沸上げ用熱交換器の流入側に個別に接続された３つのポートを有する流路切換手段であって、前記貯湯タンクの下部と前記沸上げ用熱交換器の流入側とを連通する第１流路形態と、前記利用側熱交換器の流出側と前記沸上げ用熱交換器の流入側とを連通する第２流路形態と、前記３つのポート間を相互に連通する第３流路形態のうち、何れか１つの流路形態を選択することが可能な第１の流路切換手段と、
前記貯湯タンクの上部及び下部と前記沸上げ用熱交換器の流入側及び流出側とに個別に接続された４つのポートを有し、前記貯湯タンクの上部に接続されたポートが前記利用側熱交換器の流入側にも接続された流路切換手段であって、前記沸上げ用熱交換器の流出側と前記貯湯タンクの上部とを連通する第１流路形態と、前記沸上げ用熱交換器の流出側と前記貯湯タンクの下部とを連通する第２流路形態と、前記第１の流路切換手段の流出側と前記貯湯タンクの下部とを連通する第３流路形態のうち、何れか１つの流路形態を選択することが可能な第２の流路切換手段と、
前記第１の流路切換手段と前記沸上げ用熱交換器の流入側とを接続する流路に設けられたポンプであって、吸込側が前記第１の流路切換手段に接続され、吐出側が前記沸上げ用熱交換器の流入側及び前記第２の流路切換手段に接続された循環ポンプと、
前記第１，第２の流路切換手段の切換動作を実行し、貯湯式給湯機の運転形態を複数の運転形態間で移行する制御手段と、
前記第１，第２の流路切換手段を一緒に切換えて運転形態を移行する場合に、運転形態の移行後における少なくとも一方の流路切換手段の流路形態に応じて、前記第１，第２の流路切換手段の切換順序を変更する切換順序可変手段と、
を備えた貯湯式給湯機。 A heating device having a heat exchanger for boiling to which heat is supplied from a heat source, and heating water flowing through the heat exchanger for boiling;
A hot water storage tank for storing hot water heated by the heating device;
A use-side heat exchanger that heats the water to be heated using the hot water stored in the hot water storage tank and the heat of the hot water heated by the heating device;
Channel switching means having three ports individually connected to the lower part of the hot water storage tank, the outflow side of the use side heat exchanger and the inflow side of the boiling heat exchanger, the lower part of the hot water storage tank And a second flow path communicating between the outflow side of the utilization side heat exchanger and the inflow side of the boiling heat exchanger. A first flow path switching means capable of selecting any one flow path form among the form and the third flow path form communicating with each other between the three ports;
There are four ports individually connected to the upper and lower parts of the hot water storage tank and the inflow side and the outflow side of the boiling heat exchanger, and the ports connected to the upper part of the hot water storage tank are used side heat. A flow path switching means connected to the inflow side of the exchanger, the first flow path configuration communicating the outflow side of the boiling heat exchanger and the upper part of the hot water storage tank; and the boiling heat Of the second flow path form that communicates the outflow side of the exchanger and the lower part of the hot water storage tank, and the third flow path form that communicates the outflow side of the first flow path switching means and the lower part of the hot water storage tank. Second flow path switching means capable of selecting any one flow path form;
A pump provided in a flow path connecting the first flow path switching means and the inflow side of the boiling heat exchanger, the suction side being connected to the first flow path switching means, and the discharge side being A circulation pump connected to the inflow side of the boiling heat exchanger and the second flow path switching means;
Run the switching operation of said first, second channel switching means, and control means to migrate the operating configuration of the hot-water storage type water heater between a plurality of operating configuration,
When the operation mode is shifted by switching the first and second channel switching means together, the first and first channel switching means are changed according to the channel configuration of at least one of the channel switching means after the transition of the operation mode . Switching order variable means for changing the switching order of the two flow path switching means;
Hot water storage water heater equipped with. 前記第２の流路切換手段と前記貯湯タンクの上部とを接続する流路であって、外部に給湯する給湯流路が接続されたタンク上部流路と、
前記給湯流路の接続部よりも前記第２の流路切換手段に近い位置で前記タンク上部流路の途中から分岐し、前記利用側熱交換器を介して前記第１の流路切換手段に接続された加熱水流路と、を備え、
前記切換順序可変手段は、運転形態の移行後における前記第２の流路切換手段の流路形態が前記第１流路形態の場合に、前記第１の流路切換手段の切換動作を先に実行してから前記第２の流路切換手段の切換動作を実行することで運転形態を移行し、運転形態の移行前に前記タンク上部流路に滞留していた低温水が前記給湯流路に流入して給湯温度が変動するのを抑制してなる請求項１に記載の貯湯式給湯機。 A channel connecting the second channel switching means and the upper part of the hot water storage tank, wherein the tank upper channel is connected to a hot water supply channel for supplying hot water to the outside;
Branches from the middle of the tank upper flow path at a position closer to the second flow path switching means than the connection portion of the hot water flow path, and passes to the first flow path switching means via the use side heat exchanger. A connected heated water flow path,
The switching order variable means first performs the switching operation of the first flow path switching means when the flow path configuration of the second flow path switching means after the transition of the operation mode is the first flow path configuration. The operation mode is shifted by executing the switching operation of the second channel switching means after the execution, and the low temperature water staying in the tank upper channel before the transition of the operation mode is transferred to the hot water supply channel. The hot water storage type hot water supply device according to claim 1, wherein the hot water supply temperature is suppressed from flowing and fluctuating . 前記第２の流路切換手段と前記貯湯タンクの上部とを接続する流路であって、外部に給湯する給湯流路が接続されたタンク上部流路と、
前記給湯流路の接続部よりも前記第２の流路切換手段に近い位置で前記タンク上部流路の途中から分岐し、前記利用側熱交換器を介して前記第１の流路切換手段に接続された加熱水流路と、を備え、
前記切換順序可変手段は、運転形態の移行後における前記第２の流路切換手段の流路形態が前記第２流路形態または前記第３流路形態の場合に、前記第２の流路切換手段の切換動作を先に実行してから前記第１の流路切換手段の切換動作を実行することで運転形態を移行し、運転形態の移行前に前記タンク上部流路に滞留していた低温水が前記給湯流路に流入して給湯温度が変動するのを抑制してなる請求項１または２に記載の貯湯式給湯機。 A channel connecting the second channel switching means and the upper part of the hot water storage tank, wherein the tank upper channel is connected to a hot water supply channel for supplying hot water to the outside;
Branches from the middle of the tank upper flow path at a position closer to the second flow path switching means than the connection portion of the hot water flow path, and passes to the first flow path switching means via the use side heat exchanger. A connected heated water flow path,
The switching order changing means is configured to switch the second flow path switching when the flow path configuration of the second flow path switching means after the transition of the operation mode is the second flow path configuration or the third flow path configuration. The operation mode is shifted by executing the switching operation of the first flow path switching unit after the switching operation of the first means, and the low temperature that has been retained in the tank upper flow path before the transition of the operation mode The hot water storage type hot water supply apparatus according to claim 1 or 2, wherein water is suppressed from flowing into the hot water supply flow path and fluctuating a hot water supply temperature . 前記切換順序可変手段は、運転形態の移行後における前記第１の流路切換手段の流路形態が前記第１流路形態の場合に、前記第１の流路切換手段の切換動作を先に実行してから前記第２の流路切換手段の切換動作を実行することで運転形態を移行し、運転形態の移行時に前記利用側熱交換器に流入する湯水が低温水と高温水との間で変化するのを抑制してなる請求項１乃至３のうち何れか１項に記載の貯湯式給湯機。 The switching order variable means first performs the switching operation of the first flow path switching means when the flow path configuration of the first flow path switching means after the transition of the operation mode is the first flow path configuration. The operation mode is changed by executing the switching operation of the second flow path switching means after the execution, and hot water flowing into the use side heat exchanger at the time of the change of the operation mode is between the low temperature water and the high temperature water. The hot water storage type hot water supply device according to any one of claims 1 to 3, wherein the hot water storage type water heater according to any one of claims 1 to 3 is suppressed . 前記切換順序可変手段は、運転形態の移行後における前記第１の流路切換手段の流路形態が前記第２流路形態または前記第３流路形態の場合に、前記第２の流路切換手段の切換動作を先に実行してから前記第１の流路切換手段の切換動作を実行することで運転形態を移行し、運転形態の移行時に前記利用側熱交換器に流入する湯水が低温水と高温水との間で変化するのを抑制してなる請求項１乃至４のうち何れか１項に記載の貯湯式給湯機。 The switching order changing means is configured to change the second flow path switching when the flow path form of the first flow path switching means after the transition of the operation form is the second flow path form or the third flow path form. The operation mode is shifted by executing the switching operation of the first flow path switching unit after the switching operation of the first means , and the hot water flowing into the use side heat exchanger at the time of the transition of the operation mode is low temperature The hot water storage type hot water supply device according to any one of claims 1 to 4, wherein the hot water storage device suppresses a change between water and high temperature water . 前記制御手段は、前記第２の流路切換手段を前記第２流路形態から前記第１流路形態に切換えるときに、当該切換動作を段階的に実行してなる請求項１乃至５のうち何れか１項に記載の貯湯式給湯機。   The control means executes the switching operation stepwise when the second flow path switching means is switched from the second flow path configuration to the first flow path configuration. The hot water storage type water heater according to any one of the above. 前記制御手段は、前記第１の流路切換手段を切換えるときに、当該切換動作を段階的に実行してなる請求項１乃至６のうち何れか１項に記載の貯湯式給湯機。   The hot water storage type hot water supply apparatus according to any one of claims 1 to 6, wherein the control means executes the switching operation stepwise when switching the first flow path switching means.
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