JP2008032333A

JP2008032333A - Heat pump water heater

Info

Publication number: JP2008032333A
Application number: JP2006207615A
Authority: JP
Inventors: Toshihiko Obana; 利彦尾花
Original assignee: Sharp Corp
Current assignee: Sharp Corp
Priority date: 2006-07-31
Filing date: 2006-07-31
Publication date: 2008-02-14

Abstract

【課題】浴槽以外の給湯先には安定した温度の温水を供給することができるとともに，浴槽へ多量の温水を使うことによる湯切れのおそれを低減することが可能なヒートポンプ式給湯機を提供すること。
【解決手段】ＣＯ₂サイクルＳ１と，Ｒ４１０ＡサイクルＳ２と，ＣＯ₂冷媒及びＲ４１０Ａ冷媒と水との間で熱交換を行う水熱交換器１５と，前記水熱交換器１５により加熱された水を貯留するリザーブタンク１２とを備えてなり，浴槽への給水指令を受けたときは，前記ＣＯ₂サイクルＳ１及び／又は前記Ｒ４１０ＡサイクルＳ２を稼動させて前記水熱交換器１５により加熱された水をもっぱら浴槽に供給するとともに，前記浴槽への給水指令以外の給水指令を受けたときには，前記リザーブタンク１２に貯留された水を前記浴槽以外の給湯先に供給するヒートポンプ式給湯機Ｘ。
【選択図】図１[PROBLEMS] To provide a heat pump type hot water heater capable of supplying hot water having a stable temperature to a hot water supply destination other than a bathtub and capable of reducing the risk of running out of hot water by using a large amount of hot water in the bathtub. thing.
SOLUTION: CO ₂ cycle S1, R410A cycle S2, a water heat exchanger 15 for exchanging heat between CO ₂ refrigerant and R410A refrigerant and water, and water heated by the water heat exchanger 15 And a reserve tank 12 for storage, and when the water supply command to the bathtub is received, the water heated by the water heat exchanger 15 is operated by operating the CO ₂ cycle S1 and / or the R410A cycle S2. A heat pump type hot water heater X that supplies water to the bathtub exclusively and supplies water stored in the reserve tank 12 to a hot water supply destination other than the bathtub when a water supply command other than the water supply command to the bathtub is received.
[Selection] Figure 1

Description

本発明は，ヒートポンプ式給湯機に関し，特に，水熱交換器で加熱した水を直接給湯口へ供給する機能と，貯留タンクなどの貯留手段に貯留した水を給湯口へ供給する機能の両方を備えたヒートポンプ式給湯機に関するものである。 The present invention relates to a heat pump water heater, and in particular, has both a function of supplying water heated by a water heat exchanger directly to a hot water inlet and a function of supplying water stored in a storage means such as a storage tank to a hot water outlet. The present invention relates to a heat pump type water heater provided.

従来の一般的なヒートポンプ式給湯機には，給水口から供給された水を水熱交換器で加熱して加熱された温水をそのまま給湯口へ供給する瞬間式給湯機と，水熱交換器により加熱された温水を貯留タンクに一旦貯留し，該貯留タンクに貯留された温水を必要に応じて給湯口に供給する貯湯式給湯機とがある。
特許文献１及び特許文献２に記載のヒートポンプ式給湯機は，前記瞬間式給湯機であり，前記給湯口への給水指令を受けるたびに瞬間的に水を沸き上げて給湯口に温水を供給している。
一方，特許文献３に記載のヒートポンプ式給湯機は，貯留タンクが備えられた貯湯式給湯機であり，水熱交換器で温めた温水を予め前記貯留タンクに貯留しておき，前記給湯口への給水指令を受けると前記貯留タンクに貯留していた温水を前記給湯口に供給している。
特開２００５−１６７５５号公報特開２００５−９７２４号公報特開２００５−８３５８５号公報 The conventional general heat pump type water heater is composed of an instantaneous water heater that heats the water supplied from the water inlet with a water heat exchanger and supplies the heated hot water to the hot water outlet as it is, and a water heat exchanger. There is a hot water storage type hot water heater that temporarily stores heated hot water in a storage tank and supplies the hot water stored in the storage tank to a hot water supply port as necessary.
The heat pump type hot water heaters described in Patent Document 1 and Patent Document 2 are the instantaneous water heaters, and each time a water supply command to the hot water supply port is received, water is instantaneously boiled and hot water is supplied to the hot water supply port. ing.
On the other hand, the heat pump type hot water heater described in Patent Document 3 is a hot water storage type hot water heater provided with a storage tank, in which hot water warmed by a water heat exchanger is stored in the storage tank in advance, and then to the hot water outlet. When the water supply command is received, the hot water stored in the storage tank is supplied to the hot water supply port.
JP 2005-16755 A JP 2005-9724 A Japanese Patent Laying-Open No. 2005-83585

しかしながら，前記瞬間式給湯機では，供給された温水を溜めずにすぐに使うので，ヒートポンプサイクルが安定するまでは供給される温水の温度にはムラが生じることが多い。そのため，瞬間湯沸かしした温水によって，熱すぎたり，逆に冷たすぎるといったことが生じうる。
一方，前記貯湯式給湯機では，前記貯留タンクに貯留していた温水を使いきってしまい，温水を供給できない場合があった（所謂湯切れ）。
従って，本発明は前記事情に鑑みてなされたものであり，その目的とするところは，浴槽へ多量の温水を使うことによる湯切れのおそれを低減し，前記浴槽以外の給湯先に安定した温度の温水を供給するヒートポンプ式給湯機を提供する。 However, in the instant water heater, since the supplied hot water is used immediately without accumulating, the temperature of the supplied hot water is often uneven until the heat pump cycle is stabilized. For this reason, hot water that has been instantly heated can cause too hot or conversely too cold.
On the other hand, in the hot water storage type water heater, there are cases where the hot water stored in the storage tank is exhausted and the hot water cannot be supplied (so-called hot water shortage).
Therefore, the present invention has been made in view of the above circumstances, and its object is to reduce the risk of running out of hot water due to the use of a large amount of hot water in the bathtub, and to stabilize the temperature at the hot water supply destination other than the bathtub. A heat pump type water heater that supplies hot water.

上述のように，第１の冷媒が少なくとも第１の膨張器及び第１の圧縮機を経て循環される第１のヒートポンプサイクルと，第２の冷媒が少なくとも第２の膨張器及び第２の圧縮機を経て循環される第２のヒートポンプサイクルとを備え，前記第１の冷媒及び前記第２の冷媒と水との間で熱交換を行う水熱交換器と，前記水熱交換器により加熱された水を貯留する貯留手段との両方を備えた従来のヒートポンプ式給湯機では，前記水熱交換器を用いて温めた温水を使う場合に，前記水熱交換器により熱交換されて供給される温水の温度にムラが生じることがある。そのため，給湯先（例えばシャワーや台所の蛇口など）に前記水熱交換器により加熱された温水を供給する場合，利用者が期待する温度の温水を得ることができない場合があった。さらに，前記貯留手段に貯留された温水を使いきってしまい，温水を供給できない所謂湯切れが起こる場合があった。
そのため，本発明では，浴槽への給水指令を受けたときは，前記第１のヒートポンプサイクル及び／又は前記第２のヒートポンプサイクルを駆動させて前記水熱交換器により加熱された水をもっぱら浴槽に供給するとともに，前記浴槽への給水指令以外の給水指令を受けたときには，前記貯留手段に貯留された水を前記浴槽以外の給湯先に供給する給湯先切換手段が備えられている。
このように，供給される温水の温度についてはあまり高度の制御を必要とせず，多量に温水を使う浴槽へは前記水熱交換器により加熱された水を供給し，前記浴槽以外の給湯先，例えばシャワーや台所の蛇口へは貯留手段に貯留された温水を供給するよう切り換えることで，シャワーなどで使う温水の温度を安定化させるとともに，前記浴槽へ多量の温水を使うことによる前記貯留手段での湯切れのおそれを低減させることができる。
また，前記貯留手段が，前記浴槽への給湯容量より小さい容量の貯湯タンク，又は略１００リットル以下の貯湯タンク，又は前記浴槽の略８０％以内の容量の貯湯タンクであることが好ましい。
なぜなら，前記浴槽へは瞬間湯沸かしにより加熱された水が供給されるので，従来の貯湯タンクのように浴槽へ供給するような多量の水を貯留しなくてもよいからである。これにより，前記貯留手段に貯留された水を沸かす時間が，従来の貯湯タンクに貯留された水を沸かす時間より短くてすむ。
前記第１の冷媒としては炭酸ガス冷媒（例えばＣＯ₂冷媒），前記第２の冷媒としてはＨＦＣ冷媒（例えばＨＦＣ冷媒）が考えられる。
更に，本発明は，外気温度を検知する検知手段と，前記検知手段により検知された外気温度に応じて駆動するヒートポンプサイクルを決定する使用サイクル決定手段とを備えたヒートポンプ式給湯機にも適用される。 As described above, the first heat pump cycle in which the first refrigerant is circulated through at least the first expander and the first compressor, and the second refrigerant is at least the second expander and the second compression. A second heat pump cycle that is circulated through a machine, a water heat exchanger that exchanges heat between the first refrigerant and the second refrigerant and water, and is heated by the water heat exchanger. In a conventional heat pump type hot water heater equipped with both storage means for storing fresh water, when hot water heated using the water heat exchanger is used, heat is exchanged by the water heat exchanger and supplied. There may be unevenness in the temperature of the hot water. For this reason, when supplying hot water heated by the water heat exchanger to a hot water supply destination (for example, a shower or a kitchen faucet), it may not be possible to obtain hot water at a temperature expected by the user. Furthermore, the hot water stored in the storage means may be used up, and so-called hot water shortage in which hot water cannot be supplied may occur.
Therefore, in the present invention, when the water supply instruction to the bathtub is received, the water heated by the water heat exchanger by driving the first heat pump cycle and / or the second heat pump cycle is exclusively supplied to the bathtub. A hot water supply destination switching means is provided for supplying water stored in the storage means to a hot water supply destination other than the bathtub when a water supply command other than a water supply instruction to the bathtub is received.
In this way, the temperature of the hot water supplied does not require a very high degree of control, and the water heated by the water heat exchanger is supplied to a bathtub that uses a large amount of hot water. For example, by switching the shower or kitchen faucet to supply hot water stored in the storage means, the temperature of the hot water used in the shower can be stabilized and the storage means by using a large amount of hot water in the bathtub. The risk of running out of hot water can be reduced.
Moreover, it is preferable that the storage means is a hot water storage tank having a capacity smaller than a hot water supply capacity to the bathtub, a hot water storage tank having a capacity of approximately 100 liters or less, or a hot water storage tank having a capacity of approximately 80% or less of the bathtub.
This is because the bath is supplied with water heated by instantaneous boiling, so that it is not necessary to store a large amount of water that is supplied to the bath as in a conventional hot water storage tank. Thereby, the time for boiling the water stored in the storage means can be shorter than the time for boiling the water stored in the conventional hot water storage tank.
As the first refrigerant, a carbon dioxide refrigerant (for example, CO ₂ refrigerant) can be considered, and as the second refrigerant, an HFC refrigerant (for example, HFC refrigerant) can be considered.
Furthermore, the present invention is also applied to a heat pump type water heater provided with a detecting means for detecting an outside air temperature and a use cycle determining means for determining a heat pump cycle to be driven according to the outside air temperature detected by the detecting means. The

本発明は，上述のように構成されているので，シャワーなどの前記浴槽以外の給湯先には安定した温度の温水を供給することができるとともに，浴槽へ多量の温水を使うことによる湯切れのおそれを低減することが可能なヒートポンプ式給湯機を提供することができる。
これにより，蛇口やシャワーなどから供給される温水の温度ムラにより利用者が望んでいない高温や低温の温水が供給されてしまう不都合を解消することができる。
また，多量に温水を使用する浴槽へは貯留手段に貯留された温水から供給されないので，前記貯留手段の容量は，従来の貯湯タンクの容量と比べて少なくてもよい。この場合，前記貯留手段の水を所定の温度まで沸かす時間が従来より短いという副次的効果が期待できる。 Since the present invention is configured as described above, it is possible to supply hot water having a stable temperature to a hot water supply destination other than the bathtub, such as a shower, and to prevent hot water from running out by using a large amount of hot water in the bathtub. It is possible to provide a heat pump type water heater capable of reducing the fear.
As a result, it is possible to eliminate the inconvenience of supplying hot or cold hot water not desired by the user due to uneven temperature of hot water supplied from a faucet or shower.
Moreover, since the hot water stored in the storage means is not supplied to the bathtub that uses a large amount of hot water, the capacity of the storage means may be smaller than the capacity of the conventional hot water storage tank. In this case, the secondary effect that the time for boiling the water in the storage means to a predetermined temperature can be expected.

以下添付図面を参照しながら，本発明の実施の形態について説明し，本発明の理解に供する。尚，以下の実施の形態は，本発明を具体化した一例であって，本発明の技術的範囲を限定する性格のものではない。
ここに，図１は本実施の形態に係るヒートポンプ式給湯機Ｘの概略構成を示す模式図，図２は本実施の形態に係るヒートポンプ式給湯機Ｘの制御系統のブロック図，図３は本実施の形態に係るヒートポンプ式給湯機Ｘに備えられた制御部１により実行される給湯先に応じて切り換えられる給湯処理の手順についてその一例を説明するためのフローチャートである。 Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that the present invention can be understood. The following embodiment is an example embodying the present invention, and does not limit the technical scope of the present invention.
1 is a schematic diagram showing a schematic configuration of a heat pump type hot water heater X according to the present embodiment, FIG. 2 is a block diagram of a control system of the heat pump type hot water heater X according to the present embodiment, and FIG. It is a flowchart for demonstrating the example about the procedure of the hot water supply process switched according to the hot water supply destination performed by the control part 1 with which the heat pump type hot water heater X which concerns on embodiment was equipped.

図１及び図２に示すように，本実施の形態に係るヒートポンプ式給湯機Ｘは，ヒートポンプユニットＵ，混合弁１７，二方弁１９，操作入力部２，当該ヒートポンプ式給湯機Ｘの外気温度を検知する検知手段３，これらを統括的に制御する制御部１，給水口１１，給湯口１８などを備えて構成されている。
前記ヒートポンプユニットＵは，水配管１０（１０Ａ，１０Ｂ，１０Ｃ），リザーブタンク１２，循環ポンプ１３，切り換え弁１４，水熱交換器１５，切り換え弁１６，ＣＯ₂サイクルＳ１（第１のヒートポンプサイクルの一例），Ｒ４１０ＡサイクルＳ２（第２のヒートポンプサイクルの一例）などを備えて構成されている。
前記リザーブタンク１２は，前記水熱交換器１５により熱交換（加熱）された水を貯留する。一例として一般的な浴槽よりも容量が少ない約１００Ｌのタンクである。前記リザーブタンク１２は，前記ヒートポンプユニットＵに備えられており，一般的な貯湯ユニットに備えられている貯湯タンク（例えば容量４６０Ｌのタンク）に比べて容量が少なく，該貯湯タンクとは別のものである。
前記リザーブタンク１２は，貯留手段の一例に相当する。
前記水熱交換器１５は，前記ＣＯ₂サイクルＳ１の配管３０を流れるＣＯ₂冷媒（第１の冷媒の一例。炭酸ガス冷媒の一例。）や前記Ｒ４１０ＡサイクルＳ２の配管４０を流れるＲ４１０Ａ冷媒（第２の冷媒の一例。ＨＦＣ冷媒の一例。）と，前記水配管１０の水配管１０Ａや水配管１０Ｂを流れる水との間で熱交換を行うものである。
ここで，前記水配管１０Ａは，前記給水口１１から供給された水を，前記切り換え弁１４を経て前記水熱交換器１５まで供給し前記水熱交換器１５により熱交換された水を前記切り換え弁１６を経て前記混合弁１７まで供給する流水経路，前記水配管１０Ｂは，前記リザーブタンク１２に貯留された水を，前記循環ポンプ１３，前記切り換え弁１４を経て前記水熱交換器１５まで供給し前記水熱交換器１５により熱交換された水を前記切り換え弁１６を経て前記リザーブタンク１２まで供給する流水経路である。 As shown in FIGS. 1 and 2, the heat pump type hot water heater X according to this embodiment includes a heat pump unit U, a mixing valve 17, a two-way valve 19, an operation input unit 2, and an outside air temperature of the heat pump type hot water heater X. The detection means 3, the control part 1, the water supply port 11, the hot water supply port 18, etc. which control these collectively are comprised.
The heat pump unit U includes a water pipe 10 (10A, 10B, 10C), a reserve tank 12, a circulation pump 13, a switching valve 14, a water heat exchanger 15, a switching valve 16, a CO ₂ cycle S1 (of the first heat pump cycle). An example), an R410A cycle S2 (an example of a second heat pump cycle), and the like.
The reserve tank 12 stores water subjected to heat exchange (heating) by the water heat exchanger 15. As an example, it is a tank of about 100 L having a smaller capacity than a general bathtub. The reserve tank 12 is provided in the heat pump unit U, has a smaller capacity than a hot water storage tank (for example, a tank having a capacity of 460 L) provided in a general hot water storage unit, and is different from the hot water storage tank. It is.
The reserve tank 12 corresponds to an example of a storage unit.
The water heat exchanger 15 includes a CO ₂ refrigerant (an example of a first refrigerant; an example of a carbon dioxide refrigerant) that flows through the pipe 30 of the CO ₂ cycle S1 and an R410A refrigerant (first pipe) that flows through the pipe 40 of the R410A cycle S2. 2 is an example of an HFC refrigerant.) And water that flows through the water pipe 10A and the water pipe 10B of the water pipe 10 are exchanged.
Here, the water pipe 10A supplies the water supplied from the water supply port 11 to the water heat exchanger 15 through the switching valve 14, and switches the water heat-exchanged by the water heat exchanger 15. The water flow path for supplying water to the mixing valve 17 via the valve 16 and the water pipe 10B supply water stored in the reserve tank 12 to the water heat exchanger 15 via the circulation pump 13 and the switching valve 14. The water flow path supplies the water heat-exchanged by the water heat exchanger 15 to the reserve tank 12 through the switching valve 16.

まず，水をいきなり高温に沸き上げて給湯する瞬間給湯処理について説明する。
当該ヒートポンプ式給湯機Ｘでは，前記制御部１により，前記混合弁１７，前記ヒートポンプユニットＵの前記ＣＯ₂サイクルＳ１及び／又は前記Ｒ４１０ＡサイクルＳ２と，前記切り換え弁１４，１６などの各構成要素が制御されることによって，前記給水口１１から供給された水が前記水熱交換器１５により熱交換され，熱交換された水が，前記切り換え弁１６を経て前記混合弁１７で前記給水口１１から供給された水と混合されて各給湯先に供給される。
具体的には，まず，前記制御部１により，前記給水口１１から供給された水を前記水熱交換器１５へ供給する方向へ，前記切り換え弁１４が切り換えられ，前記水熱交換器１５から供給された水を前記混合弁１７へ供給する方向へ，前記切り換え弁１６が切り換えられる。
続いて，前記給水口１１より水が供給される。
前記給水口１１により供給された水は，前記配管１０Ａを経由し前記切り換え弁１４を経て前記水熱交換器１５へ供給される。前記配管１０Ａを流れる水は，前記水熱交換器１５により前記ＣＯ₂サイクルＳ１の前記配管３０を流れる前記ＣＯ₂冷媒や前記Ｒ４１０ＡサイクルＳ２の前記配管４０を流れる前記Ｒ４１０Ａ冷媒と熱交換される。前記ＣＯ₂サイクルＳ１と前記Ｒ４１０ＡサイクルＳ２についての詳細は後記する。前記水熱交換器１５により熱交換された水は，前記切り換え弁１６を経て前記混合弁１７で前記給水口１１から供給された水と混合されて各給湯先に供給される。給湯先についての詳細は，後述する。 First, the instantaneous hot water supply process in which water is suddenly heated to a high temperature and supplied.
In the heat pump type water heater X, the control unit 1 causes each component such as the mixing valve 17, the CO ₂ cycle S1 and / or the R410A cycle S2 of the heat pump unit U, and the switching valves 14 and 16 to be changed. By being controlled, the water supplied from the water supply port 11 is heat-exchanged by the water heat exchanger 15, and the heat-exchanged water passes from the water supply port 11 by the mixing valve 17 through the switching valve 16. It is mixed with the supplied water and supplied to each hot water supply destination.
Specifically, first, the switching valve 14 is switched by the control unit 1 in a direction to supply water supplied from the water supply port 11 to the water heat exchanger 15, and from the water heat exchanger 15. The switching valve 16 is switched in a direction to supply the supplied water to the mixing valve 17.
Subsequently, water is supplied from the water supply port 11.
The water supplied from the water supply port 11 is supplied to the water heat exchanger 15 through the pipe 10A and the switching valve 14. The water flowing through the pipe 10A is heat-exchanged by the water heat exchanger 15 with the CO ₂ refrigerant flowing through the pipe 30 of the CO ₂ cycle S1 and the R410A refrigerant flowing through the pipe 40 of the R410A cycle S2. Details of the CO ₂ cycle S1 and the R410A cycle S2 will be described later. The water heat-exchanged by the water heat exchanger 15 is mixed with the water supplied from the water supply port 11 by the mixing valve 17 through the switching valve 16 and supplied to each hot water supply destination. Details of the hot water supply destination will be described later.

一方，前記リザーブタンク１２に貯留された水を徐々に温めていき前記リザーブタンク１２に貯留する貯湯処理について説明する。
当該ヒートポンプ式給湯機Ｘでは，前記制御部１により前記ＣＯ₂サイクルＳ１及び／又は前記Ｒ４１０ＡサイクルＳ２と，前記循環ポンプ１３，前記切り換え弁１４，１６などの各構成要素が制御されることによって，前記給水口１１から供給されて前記リザーブタンク１２に貯留された水を前記水熱交換器１５により熱交換（加熱）して前記リザーブタンク１２に貯留する貯湯処理が行われる。
具体的には，まず，前記リザーブタンク１２に貯留された水が前記循環ポンプ１３から前記水熱交換器１５へ供給される方向へ，前記切り換え弁１４が切り換えられ，前記水熱交換器１５から供給された水が前記リザーブタンク１２へ供給される方向へ，前記切り換え弁１６が切り換えられる。
続いて，前記給水口１１から前記リザーブタンク１２に水が供給され貯留される。
前記リザーブタンク１２に貯留された水は，前記水配管１０Ｂを経由して前記循環ポンプ１３により吸い上げられ前記切り換え弁１４を経て前記水熱交換器１５により，前記ＣＯ₂サイクルＳ１の前記配管３０を流れる前記ＣＯ₂冷媒や前記Ｒ４１０ＡサイクルＳ２の前記配管４０を流れる前記Ｒ４１０Ａ冷媒と熱交換される。前記ＣＯ₂サイクルＳ１と前記Ｒ４１０ＡサイクルＳ２についての詳細は後記する。前記水熱交換器１５により熱交換された水は，前記切り換え弁１６を経て前記リザーブタンク１２に貯留される。
前記リザーブタンク１２に貯留された水は，所望量，所望温度の水が得られるまで，前記循環ポンプ１３，前記切り換え弁１４，前記水熱交換器１５，前記切り換え弁１６，前記リザーブタンク１２を循環する。 On the other hand, a hot water storage process in which the water stored in the reserve tank 12 is gradually warmed and stored in the reserve tank 12 will be described.
In the heat pump type water heater X, the control unit 1 controls the respective components such as the CO ₂ cycle S1 and / or the R410A cycle S2, the circulation pump 13, and the switching valves 14 and 16, A hot water storage process is performed in which the water supplied from the water supply port 11 and stored in the reserve tank 12 is heat-exchanged (heated) by the water heat exchanger 15 and stored in the reserve tank 12.
Specifically, first, the switching valve 14 is switched in a direction in which water stored in the reserve tank 12 is supplied from the circulation pump 13 to the water heat exchanger 15, and from the water heat exchanger 15. The switching valve 16 is switched in the direction in which the supplied water is supplied to the reserve tank 12.
Subsequently, water is supplied from the water supply port 11 to the reserve tank 12 and stored.
The water stored in the reserve tank 12 is sucked up by the circulation pump 13 via the water pipe 10B, passed through the switching valve 14, and then passed through the pipe 30 of the CO ₂ cycle S1 by the water heat exchanger 15. Heat exchange is performed with the flowing CO ₂ refrigerant and the R410A refrigerant flowing through the pipe 40 of the R410A cycle S2. Details of the CO ₂ cycle S1 and the R410A cycle S2 will be described later. The water exchanged by the water heat exchanger 15 is stored in the reserve tank 12 through the switching valve 16.
The water stored in the reserve tank 12 is supplied to the circulation pump 13, the switching valve 14, the water heat exchanger 15, the switching valve 16, and the reserve tank 12 until a desired amount and temperature of water are obtained. Circulate.

前記ＣＯ₂サイクルＳ１は，図１に示すように，前記水熱交換器１５，前記ＣＯ₂冷媒が流れる経路である配管３０，前記ＣＯ₂冷媒を膨張させる膨張器３１（第１の膨張器の一例），前記ＣＯ₂冷媒を室外の空気と熱交換させて吸熱させ気化させる室外空気熱交換器３２，前記ＣＯ₂冷媒を圧縮する圧縮機３３（第１の圧縮機の一例）などを備えて構成されている。
前記配管３０を流れるＣＯ₂冷媒は，前記膨張器３１により膨張され，前記室外空気熱交換器３２により室外の空気と熱交換されて吸熱，気化し，前記圧縮機３３により圧縮されて高温高圧となり，前記水熱交換器１５において，前記水配管１０Ａや前記水配管１０Ｂを流れる水と熱交換される。前記水熱交換器１５により熱交換されたＣＯ₂冷媒は，再び前記膨張器３１，前記室外空気熱交換器３２，前記圧縮機３３，前記水熱交換器１５を循環する。
なお，前記ＣＯ₂冷媒は，後記のＲ４１０Ａ冷媒と異なる特性を持ち，水を高温（例えば９０℃程度）まで加熱することができる。 As shown in FIG. 1, the CO ₂ cycle S1 includes the water heat exchanger 15, a pipe 30 that is a path through which the CO ₂ refrigerant flows, and an expander 31 that expands the CO ₂ refrigerant (of the first expander). one example), the CO ₂ refrigerant outdoor air and by heat exchange the outdoor air heat exchanger 32 to be vaporized by heat absorption, the one example of the compressor 33 (first compressor for compressing CO ₂ refrigerant) comprises a like It is configured.
The CO ₂ refrigerant flowing through the pipe 30 is expanded by the expander 31, exchanges heat with outdoor air by the outdoor air heat exchanger 32, absorbs and vaporizes, and is compressed by the compressor 33 to become high temperature and high pressure. In the water heat exchanger 15, heat is exchanged with water flowing through the water pipe 10A and the water pipe 10B. The CO ₂ refrigerant exchanged by the water heat exchanger 15 circulates again through the expander 31, the outdoor air heat exchanger 32, the compressor 33, and the water heat exchanger 15.
The CO ₂ refrigerant has different characteristics from the R410A refrigerant described later, and can heat water to a high temperature (for example, about 90 ° C.).

一方，前記Ｒ４１０ＡサイクルＳ２は，図１に示すように，前記Ｒ４１０Ａ冷媒が流れる配管４０Ａ及び配管４０Ｂからなる配管４０を有している。
本実施の形態では，前記Ｒ４１０ＡサイクルＳ２を，室内の冷暖房を行う空調処理や，水を急激に高温に沸きあげて給湯する瞬間給湯処理や，前記リザーブタンク１２に貯留された水を徐々に温めていき前記リザーブタンク１２に貯留する貯湯処理に用いている。 On the other hand, as shown in FIG. 1, the R410A cycle S2 has a pipe 40 including a pipe 40A and a pipe 40B through which the R410A refrigerant flows.
In the present embodiment, the R410A cycle S2 is performed by using an air conditioning process for heating and cooling the room, an instantaneous hot water supply process in which water is rapidly boiled to a high temperature, and water stored in the reserve tank 12 is gradually warmed. It is used for hot water storage processing stored in the reserve tank 12.

まず，前記Ｒ４１０ＡサイクルＳ２を前記瞬間給湯処理や前記貯湯処理における水の加熱に用いる場合の前記Ｒ４１０Ａ冷媒が循環する経路である配管４０Ａについて説明する。
前記配管４０Ａは，図１に示すように，圧縮機４３（第２の圧縮機の一例），四方弁４４，切り換え弁４５，前記水熱交換器１５，切り換え弁４６，膨張器４１（第２の膨張器の一例），室外空気熱交換器４２，前記四方弁４４を順に閉じた回路となるように接続する管路である。
前記制御部１により，前記操作入力部２を通じた操作入力により浴槽への給湯処理開始の指示が入力されたと判断されると，前記圧縮機４３，前記膨張器４１が駆動され，前記四方弁４４，前記切り換え弁４５，４６が制御される。そして前記制御部１により，前記切り換え弁４５が，前記四方弁４４から供給された前記Ｒ４１０Ａ冷媒が前記水熱交換器１５へ流れる方向に切り換えられるとともに，前記切り換え弁４６が，前記水熱交換器１５から供給された前記Ｒ４１０Ａ冷媒が前記膨張器４１へ流れる方向に切り換えられる。これにより，前記Ｒ４１０Ａ冷媒は，前記配管４０Ａを実線矢印方向に循環する。
具体的には，前記配管４０Ａを流れるＲ４１０Ａ冷媒は，前記膨張器４１により膨張され，前記室外空気熱交換器４２により室外の空気と熱交換されて吸熱，気化し，前記四方弁４４を経て前記圧縮機４３により圧縮されて高温高圧となり，前記四方弁４４，前記切り換え弁４５を経て前記水熱交換器１５において，前記水配管１０Ｂを流れる水と熱交換される。前記水熱交換器１５により熱交換されたＲ４１０Ａ冷媒は，前記切り換え弁４６を経て再び前記膨張器４１，前記室外空気熱交換器４２，前記四方弁４４，前記圧縮機４３，前記四方弁４４，前記切り換え弁４５，前記水熱交換器１５を循環する。
このように，前記Ｒ４１０Ａ冷媒が，前記配管４０Ａを循環することにより，前記水配管１０Ｂを流れる水を加熱して，前記瞬間給湯処理や前記貯湯処理に利用される。
なお，前記Ｒ４１０Ａ冷媒は，前記ＣＯ₂冷媒と異なる特性を持ち，水を中低温（例えば６５℃程度）までしか加熱することができない。 First, the pipe 40A, which is a path through which the R410A refrigerant circulates when the R410A cycle S2 is used for heating water in the instantaneous hot water supply process or the hot water storage process, will be described.
As shown in FIG. 1, the pipe 40A includes a compressor 43 (an example of a second compressor), a four-way valve 44, a switching valve 45, the water heat exchanger 15, a switching valve 46, and an expander 41 (second This is a pipe line connecting the outdoor air heat exchanger 42 and the four-way valve 44 in order to form a closed circuit.
When it is determined by the control unit 1 that an instruction to start hot water supply processing to the bathtub has been input by an operation input through the operation input unit 2, the compressor 43 and the expander 41 are driven, and the four-way valve 44 The switching valves 45 and 46 are controlled. The control unit 1 switches the switching valve 45 in a direction in which the R410A refrigerant supplied from the four-way valve 44 flows to the water heat exchanger 15, and the switching valve 46 includes the water heat exchanger. The R410A refrigerant supplied from 15 is switched in a direction to flow to the expander 41. Thereby, the R410A refrigerant circulates in the pipe 40A in the direction of the solid arrow.
Specifically, the R410A refrigerant flowing through the pipe 40A is expanded by the expander 41, and heat is exchanged with the outdoor air by the outdoor air heat exchanger 42 to absorb and vaporize, and passes through the four-way valve 44 and passes through the four-way valve 44. It is compressed by the compressor 43 to become a high temperature and a high pressure, and is exchanged with the water flowing through the water pipe 10B in the water heat exchanger 15 through the four-way valve 44 and the switching valve 45. The R410A refrigerant that has been heat-exchanged by the water heat exchanger 15 passes through the switching valve 46 again, and then expands 41, the outdoor air heat exchanger 42, the four-way valve 44, the compressor 43, the four-way valve 44, The switching valve 45 and the water heat exchanger 15 are circulated.
In this way, the R410A refrigerant circulates through the pipe 40A, thereby heating the water flowing through the water pipe 10B and being used for the instantaneous hot water supply process and the hot water storage process.
The R410A refrigerant has different characteristics from the CO ₂ refrigerant and can only heat water to a medium low temperature (eg, about 65 ° C.).

続いて，前記Ｒ４１０ＡサイクルＳ２を空調処理（室内空気の加熱（暖房）又は冷却（冷房））に用いる場合の前記Ｒ４１０Ａ冷媒が循環する経路である配管４０Ｂについて説明する。
前記配管４０Ｂは，図１に示すように，前記圧縮機４３，前記四方弁４４，前記切り換え弁４５，室内空気熱交換器４７，前記切り換え弁４６，前記膨張器４１，前記室外空気熱交換器４２，前記四方弁４４を順に閉じた回路として接続する管路である。
前記室内空気熱交換器４７は，室内の冷暖房を行う空気調和機（不図示）に設けられ，前記配管４０Ｂを流れる前記Ｒ４１０Ａ冷媒と室内空気との間で熱交換を行うことにより室内空気を加熱或いは冷却するものである。
まず，室内空気を加熱する暖房の場合に前記Ｒ４１０ＡサイクルＳ２で行われる空調処理について説明する。
前記制御部１により，前記操作入力部２を通じた操作入力により暖房開始の指示が入力されたと判断されると，前記圧縮機４３，前記膨張器４１が駆動され，前記四方弁４４，前記切り換え弁４５，４６が制御される。このとき，前記四方弁４４内部では図示する実線経路が確立されている。そして前記制御部１により，前記四方弁４４から供給された前記Ｒ４１０Ａ冷媒が前記室内空気熱交換器４７へ流れる方向に，前記切り換え弁４５が切り換えられるとともに，前記室内空気熱交換器４７から供給された前記Ｒ４１０Ａ冷媒が前記膨張器４１へ流れる方向に，前記切り換え弁４６が切り換えられる。これにより，前記Ｒ４１０Ａ冷媒は，前記配管４０Ｂを実線矢印方向に循環する。
具体的には，前記配管４０Ｂを流れる前記Ｒ４１０Ａ冷媒は，前記膨張器４１により膨張され，前記室外空気熱交換器４２により室外の空気と熱交換されて吸熱，気化し，前記四方弁４４を経て前記圧縮機４３により圧縮されて高温高圧となり，前記四方弁４４，前記切り換え弁４５を経て前記室内空気熱交換器４７により室内の空気と熱交換されて冷却される。前記室内空気熱交換器４７により熱交換されて冷却されたＲ４１０Ａ冷媒は，前記切り換え弁４６を経て再び前記膨張器４１，前記室外空気熱交換器４２，前記四方弁４４，前記圧縮機４３，前記四方弁４４，前記切り換え弁４５，前記室内空気熱交換器４７を循環する。
このようにして，前記Ｒ４１０Ａ冷媒が，前記配管４０Ｂを循環して室内空気との間で熱交換を行うことにより，室内空気が加熱（暖房）される。
なお，室内空気を冷却する冷房の場合に前記Ｒ４１０ＡサイクルＳ２で行われる空調処理は，前記Ｒ４１０Ａ冷媒が前記暖房の場合に前記配管４０Ｂを流れる順序と逆に循環して行われる。 Next, the pipe 40B, which is a path through which the R410A refrigerant circulates when the R410A cycle S2 is used for air conditioning processing (heating (heating) or cooling (cooling) indoor air) will be described.
As shown in FIG. 1, the pipe 40B includes the compressor 43, the four-way valve 44, the switching valve 45, the indoor air heat exchanger 47, the switching valve 46, the expander 41, and the outdoor air heat exchanger. 42, a pipe line for connecting the four-way valve 44 as a closed circuit in order.
The indoor air heat exchanger 47 is provided in an air conditioner (not shown) that cools and heats the room, and heats the room air by exchanging heat between the R410A refrigerant flowing through the pipe 40B and the room air. Or it is what cools.
First, an air conditioning process performed in the R410A cycle S2 in the case of heating for heating indoor air will be described.
When it is determined by the control unit 1 that an instruction to start heating is input by an operation input through the operation input unit 2, the compressor 43 and the expander 41 are driven, and the four-way valve 44, the switching valve 45 and 46 are controlled. At this time, the illustrated solid line path is established inside the four-way valve 44. The control unit 1 switches the switching valve 45 in the direction in which the R410A refrigerant supplied from the four-way valve 44 flows to the indoor air heat exchanger 47, and is supplied from the indoor air heat exchanger 47. The switching valve 46 is switched in the direction in which the R410A refrigerant flows to the expander 41. Thereby, the R410A refrigerant circulates in the pipe 40B in the direction of the solid line arrow.
Specifically, the R410A refrigerant flowing through the pipe 40B is expanded by the expander 41, and heat is exchanged with the outdoor air by the outdoor air heat exchanger 42 to absorb and vaporize, and passes through the four-way valve 44. It is compressed by the compressor 43 to become high temperature and high pressure, and is cooled by exchanging heat with indoor air by the indoor air heat exchanger 47 through the four-way valve 44 and the switching valve 45. The R410A refrigerant that has been heat-exchanged and cooled by the indoor air heat exchanger 47 passes through the switching valve 46 again, and then the expander 41, the outdoor air heat exchanger 42, the four-way valve 44, the compressor 43, the The four-way valve 44, the switching valve 45, and the indoor air heat exchanger 47 are circulated.
In this way, the R410A refrigerant circulates through the pipe 40B and exchanges heat with the room air, thereby heating (heating) the room air.
Note that the air conditioning processing performed in the R410A cycle S2 in the case of cooling for cooling indoor air is performed in a reverse manner to the order in which the R410A refrigerant flows through the pipe 40B in the case of heating.

前述のような瞬間給湯処理のみで温水の供給を行う従来の瞬間式給湯機では，ヒートポンプサイクルが安定するまでに供給される温水の温度にムラが生じることが多かった。そのため，シャワーや蛇口などに供給する場合，利用者にとって熱すぎたり逆に冷たすぎたりすることがあった。
また，前述のような貯湯処理により貯留された温水を供給する従来の貯湯式給湯機では，貯留していた温水を使い切ってしまう所謂湯切れを起こす場合があった。
本実施の形態では，以下に示すように，浴槽以外の給湯先に安定した温度の温水を供給することができるとともに，浴槽へ多量の温水を使うことによる湯切れのおそれを低減することが可能なヒートポンプ式給湯機を提供する。 In the conventional instantaneous water heater that supplies hot water only by the instantaneous hot water treatment as described above, the temperature of the hot water supplied is often uneven before the heat pump cycle is stabilized. For this reason, when it is supplied to a shower or faucet, it may be too hot or too cold for the user.
Moreover, in the conventional hot water storage type hot water supply apparatus that supplies the hot water stored by the hot water storage process as described above, there is a case where the hot water that has been used up is used up.
In this embodiment, as shown below, hot water having a stable temperature can be supplied to a hot water supply destination other than the bathtub, and the possibility of running out of hot water due to the use of a large amount of hot water in the bathtub can be reduced. A simple heat pump water heater.

図３のフローチャートに基づいて，本実施の形態に係るヒートポンプ式給湯機Ｘに備えられた制御部１により実行される給湯先に応じて切り換えられる給湯処理の手順についてその一例を説明する。
図中のＳ１０，Ｓ２０…は処理手順（ステップ）番号を示し，処理はステップＳ１０より開始される。
ステップＳ１０では，前記制御部１により，浴槽への給水指令を受けたか否かが判断される。具体的には，例えば前記操作入力部２のお湯はりボタン２−１（図２参照）を通じた操作入力により浴槽への給水指令がなされ，前記制御部１により，浴槽への給水指令を受けたと判断された場合（ステップＳ１０のＹｅｓ側），処理はステップＳ２０に移行される。前記操作入力部２のお湯はり以外のボタン（例えば図２に示すシャワーボタン２−２）などを通じた操作入力により浴槽以外（シャワー，台所の蛇口など）への給水指令がなされ，前記制御部１により，浴槽への給水指令以外の給水指令を受けたと判断された場合（ステップＳ１０のＮｏ側），処理はステップＳ１１に移行される。 Based on the flowchart of FIG. 3, an example of the procedure of the hot water supply process switched according to the hot water supply destination executed by the control unit 1 provided in the heat pump type hot water heater X according to the present embodiment will be described.
In the figure, S10, S20.
In step S10, the control unit 1 determines whether or not a water supply command to the bathtub has been received. Specifically, for example, a water supply command to the bathtub is given by an operation input through the hot water button 2-1 (see FIG. 2) of the operation input unit 2, and the control unit 1 receives a water supply command to the bathtub. If it is determined (Yes in step S10), the process proceeds to step S20. A water supply command to a part other than the bathtub (shower, kitchen faucet, etc.) is given by an operation input through a button other than the hot water heater of the operation input unit 2 (for example, the shower button 2-2 shown in FIG. 2). Thus, if it is determined that a water supply command other than the water supply command to the bathtub has been received (No side of step S10), the process proceeds to step S11.

ステップＳ１１では，浴槽への給水指令以外の給水指令を受けて，前記制御部１により，前記リザーブタンク１２に貯留された水を前記リザーブタンク１２から前記混合弁１７へ供給する方向へ，前記切り換え弁１６が切り換えられる。さらに，給水指令がなされた給湯先に応じて，前記給湯口１８から温水が供給される経路が切り換えられ，給水指令を受けた給湯先（例えばシャワー）に，前記リザーブタンク１２に貯留された温水が前記給湯口１８から供給される（ステップＳ１２）。具体的には，前記リザーブタンク１２に貯留された温水が，前記リザーブタンク１２と前記切り換え弁１６とを接続する水配管１０Ｃを図１における破線矢印方向に流れて前記切り換え弁１６に供給され，前記切り換え弁１６に供給された温水が，前記混合弁１７が制御されることにより前記給水口１１から供給された水と混合されて前記給湯口１８に供給される。その後，前記切り換えられた経路の給湯先に供給され，処理はステップＳ１３に移行される。 In step S11, in response to a water supply command other than a water supply command to the bathtub, the control unit 1 switches the direction of supplying water stored in the reserve tank 12 from the reserve tank 12 to the mixing valve 17. The valve 16 is switched. Further, the route through which hot water is supplied from the hot water supply port 18 is switched according to the hot water supply destination for which the water supply command has been issued, and the hot water stored in the reserve tank 12 is supplied to the hot water supply destination (for example, a shower) that has received the water supply command. Is supplied from the hot water supply port 18 (step S12). Specifically, the hot water stored in the reserve tank 12 flows through the water pipe 10C connecting the reserve tank 12 and the switching valve 16 in the direction of the broken line arrow in FIG. 1, and is supplied to the switching valve 16. The hot water supplied to the switching valve 16 is mixed with the water supplied from the water supply port 11 by the control of the mixing valve 17 and supplied to the hot water supply port 18. Thereafter, the hot water supply destination of the switched path is supplied, and the process proceeds to step S13.

前記ステップＳ１３では，前記制御部１により，予め定められた条件が充足されたか否かが判断される。一例として，前記予め定められた条件が，前記空気調和機の運転停止及び予め定められた時刻である，或いは，前記空気調和機の運転停止及び前記リザーブタンク１２に貯留された水の温度が予め定められた温度（例えば４５℃）未満である，などの条件が考えられる。前記制御部１により前記予め定められた条件が充足されたと判断されると（ステップＳ１３のＹｅｓ側），後記のステップＳ１４〜ステップＳ１７の貯湯処理が実行される。前記制御部１により前記予め定められた条件が充足されていないと判断されると（ステップＳ１３のＮｏ側），処理は終了する。 In step S13, the control unit 1 determines whether or not a predetermined condition is satisfied. As an example, the predetermined condition is an operation stop of the air conditioner and a predetermined time, or an operation stop of the air conditioner and a temperature of water stored in the reserve tank 12 are set in advance. Conditions such as a temperature lower than a predetermined temperature (for example, 45 ° C.) are conceivable. When it is determined by the control unit 1 that the predetermined condition is satisfied (Yes side in step S13), hot water storage processing in steps S14 to S17 described later is executed. If the control unit 1 determines that the predetermined condition is not satisfied (No side in step S13), the process ends.

ステップＳ１４では，前記制御部１により，前記検知手段３により検知された外気温度が１５℃以下であるか否かが判断される。前記検知手段３により検知された外気温度が１５℃以下であれば（ステップＳ１４のＹｅｓ側），処理はステップＳ１５に移行される。前記検知手段３により検知された外気温度が１５℃より高ければ（ステップＳ１４のＮｏ側），処理はステップＳ１６に移行される。
ステップＳ１５では，前記ＣＯ₂サイクルＳ１が駆動されて前記リザーブタンク１２に温水が貯留される貯湯処理が行われる。具体的には，まず，前記制御部１により，前記循環ポンプ１３から供給された水を前記水熱交換器１５に供給する方向に，前記切り換え弁１４が切り換えられるとともに，前記水熱交換器１５から供給された水を前記リザーブタンク１２に供給する方向に，前記切り換え弁１６が切り換えられる。その後，前記循環ポンプ１３が駆動されることにより，前記リザーブタンク１２に貯留された水が，前記水配管１０Ｂを経て前記循環ポンプ１３により吸い上げられ，前記切り換え弁１４を経て前記水熱交換器１５に供給される。一方，前記制御部１により前記ＣＯ₂サイクルＳ１の前記膨張器３１，前記圧縮機３３が駆動されて，前記ＣＯ₂冷媒が前記配管３０を循環することにより前記水熱交換器１５において前記水配管１０Ｂを流れる水が加熱される。そして，前記水熱交換器１５により熱交換された水は，前記切り換え弁１６を経て前記リザーブタンク１２に貯留される。続いて，処理はステップＳ１７に移行される。
ステップＳ１６では，前記Ｒ４１０ＡサイクルＳ２が駆動されて前記リザーブタンク１２に温水が貯留される貯湯処理が行われる。具体的には，まず，前記制御部１により，前記循環ポンプ１３から供給された水を前記水熱交換器１５に供給する方向に，前記切り換え弁１４が切り換えられるとともに，前記水熱交換器１５から供給された水を前記リザーブタンク１２に供給する方向に，前記切り換え弁１６が切り換えられる。その後，前記循環ポンプ１３が駆動されることにより，前記リザーブタンク１２に貯留された水が，前記水配管１０Ｂを経て前記循環ポンプ１３により吸い上げられ，前記切り換え弁１４を経て前記水熱交換器１５に供給される。一方，前記制御部１により前記Ｒ４１０ＡサイクルＳ２の前記四方弁４４が図１に示す実線経路に切り換えられるとともに，前記四方弁４４から供給された前記Ｒ４１０Ａ冷媒を前記水熱交換器１５に供給する方向に，前記切り換え弁４５が切り換えられ，更に，前記水熱交換器１５から供給された前記Ｒ４１０Ａ冷媒を前記膨張器４１に供給する方向に，前記切り換え弁４６が切り換えられる。続いて，前記膨張器４１，前記圧縮機４３が駆動されて，前記Ｒ４１０Ａ冷媒が前記配管４０Ａを循環することにより前記水熱交換器１５において前記水配管１０Ｂを流れる水が加熱される。そして，前記水熱交換器１５により熱交換された水は，前記切り換え弁１６を経て前記リザーブタンク１２に貯留される。その後，処理はステップＳ１７に移行される。
ステップＳ１７では，前記制御部１により，前記貯湯処理が終了したか否かが判断される。前記リザーブタンク１２に設けられた温度センサ２０（図１及び図２参照）からの信号によって，予め定められた温度（一例として，前記ＣＯ₂サイクルＳ１により加熱（熱交換）される場合は９０℃。前記Ｒ４１０ＡサイクルＳ２により加熱（熱交換）される場合は６５℃。）の温水が予め定められた水位に達したと判断される場合には，前記制御部１により，前記貯湯処理が終了したと判断され（ステップＳ１７のＹｅｓ側），処理は終了する。前記リザーブタンク１２に，予め定められた温度の所望量の温水が貯留されていなければ，前記制御部１により，前記貯湯処理が終了していないと判断され（ステップＳ１７のＮｏ側），処理はステップＳ１５又はステップＳ１６に戻り，前記リザーブタンク１２に，予め定められた温度の所望量の温水が貯留されるまで貯湯処理が実行される。 In step S14, the control unit 1 determines whether or not the outside air temperature detected by the detection means 3 is 15 ° C. or less. If the outside air temperature detected by the detection means 3 is 15 ° C. or less (Yes side in step S14), the process proceeds to step S15. If the outside air temperature detected by the detection means 3 is higher than 15 ° C. (No side of step S14), the process proceeds to step S16.
In step S15, the hot water storage process in which the CO ₂ cycle S1 is driven and hot water is stored in the reserve tank 12 is performed. Specifically, first, the control valve 1 switches the switching valve 14 in a direction in which the water supplied from the circulation pump 13 is supplied to the water heat exchanger 15 and the water heat exchanger 15. The switching valve 16 is switched in such a direction that the water supplied from is supplied to the reserve tank 12. Thereafter, when the circulation pump 13 is driven, the water stored in the reserve tank 12 is sucked up by the circulation pump 13 through the water pipe 10B, and is passed through the switching valve 14 to the water heat exchanger 15. To be supplied. On the other hand, the controller 1 drives the expander 31 and the compressor 33 in the CO ₂ cycle S 1, and the CO ₂ refrigerant circulates in the pipe 30, whereby the water pipe in the water heat exchanger 15. The water flowing through 10B is heated. The water heat-exchanged by the water heat exchanger 15 is stored in the reserve tank 12 through the switching valve 16. Subsequently, the process proceeds to step S17.
In step S16, the R410A cycle S2 is driven to perform hot water storage processing in which hot water is stored in the reserve tank 12. Specifically, first, the control valve 1 switches the switching valve 14 in a direction in which the water supplied from the circulation pump 13 is supplied to the water heat exchanger 15 and the water heat exchanger 15. The switching valve 16 is switched in such a direction that the water supplied from is supplied to the reserve tank 12. Thereafter, when the circulation pump 13 is driven, the water stored in the reserve tank 12 is sucked up by the circulation pump 13 through the water pipe 10B, and is passed through the switching valve 14 to the water heat exchanger 15. To be supplied. On the other hand, the control unit 1 switches the four-way valve 44 of the R410A cycle S2 to the solid line path shown in FIG. 1 and supplies the R410A refrigerant supplied from the four-way valve 44 to the water heat exchanger 15. In addition, the switching valve 45 is switched, and further, the switching valve 46 is switched in a direction to supply the R410A refrigerant supplied from the water heat exchanger 15 to the expander 41. Subsequently, the expander 41 and the compressor 43 are driven, and the R410A refrigerant circulates through the pipe 40A, whereby water flowing through the water pipe 10B is heated in the water heat exchanger 15. The water heat-exchanged by the water heat exchanger 15 is stored in the reserve tank 12 through the switching valve 16. Thereafter, the process proceeds to step S17.
In step S17, the controller 1 determines whether or not the hot water storage process has been completed. 90 ° C. when heated (heat exchanged) by the CO ₂ cycle S1 according to a predetermined temperature based on a signal from a temperature sensor 20 (see FIGS. 1 and 2) provided in the reserve tank 12 When it is determined that the hot water of 65 ° C. is heated (heat exchange) by the R410A cycle S2, the control unit 1 ends the hot water storage process. (Yes in step S17), and the process ends. If the reserve tank 12 does not store a desired amount of hot water at a predetermined temperature, the controller 1 determines that the hot water storage process has not been completed (No side of step S17), and the process is Returning to step S15 or step S16, hot water storage processing is executed until a desired amount of hot water at a predetermined temperature is stored in the reserve tank 12.

一方，ステップＳ２０では，浴槽への給水指令を受けて，前記制御部１により，前記給水口１１から供給された水を前記水熱交換器１５へ供給する方向へ前記切り換え弁１４が切り換えられるとともに，前記水熱交換器１５から供給された水を前記混合弁１７へ供給する方向へ前記切り換え弁１６が切り換えられる。そして，前記二方弁１９が開栓され，処理はステップＳ３０に移行される。 On the other hand, in step S20, upon receiving a water supply command to the bathtub, the control valve 1 switches the switching valve 14 in a direction to supply the water supplied from the water supply port 11 to the water heat exchanger 15. The switching valve 16 is switched in a direction to supply the water supplied from the water heat exchanger 15 to the mixing valve 17. Then, the two-way valve 19 is opened, and the process proceeds to step S30.

ステップＳ３０では，前記制御部１により，前記空気調和機の運転が停止しているか否かが判断される。具体的には，前記膨張器４１及び前記圧縮機４３が駆動していなければ，前記Ｒ４１０ＡサイクルＳ２の前記配管４０Ｂを前記Ｒ４１０Ａ冷媒が循環していないので，前記制御部１により，前記空気調和機の運転が停止していると判断され（ステップＳ３０のＹｅｓ側），処理はステップＳ４０に移行される。前記膨張器４１及び前記圧縮機４３が駆動していれば，前記Ｒ４１０ＡサイクルＳ２の前記配管４０Ｂを前記Ｒ４１０Ａ冷媒が循環しているので，前記制御部１により，前記空気調和機の運転がなされていると判断され（ステップＳ３０のＮｏ側），処理はステップＳ３１に移行される。 In step S30, the control unit 1 determines whether or not the operation of the air conditioner is stopped. Specifically, if the expander 41 and the compressor 43 are not driven, the R410A refrigerant does not circulate through the pipe 40B of the R410A cycle S2. Is determined to have stopped (Yes in step S30), and the process proceeds to step S40. If the expander 41 and the compressor 43 are driven, the R410A refrigerant is circulated through the pipe 40B of the R410A cycle S2, so that the controller 1 operates the air conditioner. (No side of step S30), and the process proceeds to step S31.

前記ステップＳ３０の判断結果によれば，前記空気調和機の運転がなされている，すなわち，前述のように，前記Ｒ４１０ＡサイクルＳ２では，前記Ｒ４１０Ａ冷媒が前記配管４０Ｂを循環して空調処理を実行しており，前記Ｒ４１０Ａ冷媒は前記配管４０Ａを流れないので前記水熱加熱器１５において前記配管１０を流れる水と熱交換を行うことができない。そのため，ステップＳ３１では，前記ＣＯ₂サイクルＳ１が駆動されて瞬間給湯処理が行われる。具体的には，前記制御部１により，前記ＣＯ₂サイクルＳ１の前記膨張器３１，前記圧縮機３３が駆動されるとともに，前記給水口１１から供給された水を前記水熱交換器１５に供給する方向へ前記切り換え弁１４が切り換えられ，さらに前記水熱交換器１５により供給された水を前記混合弁１７に供給する方向へ前記切り換え弁１６が切り換えられる。これにより，前記給水口１１から供給され前記水配管１０Ａを経由し前記切り換え弁１４を経て前記水熱交換器１５に供給された水が，前記水熱交換器１５により前記ＣＯ₂冷媒と熱交換されて温水となり，前記切り換え弁１６に供給される瞬間給湯処理が実行され，処理はステップＳ６０に移行される。 According to the determination result of step S30, the air conditioner is in operation, that is, as described above, in the R410A cycle S2, the R410A refrigerant circulates through the pipe 40B and executes the air conditioning process. Since the R410A refrigerant does not flow through the pipe 40A, the hydrothermal heater 15 cannot exchange heat with water flowing through the pipe 10. For this reason, in step S31, the CO ₂ cycle S1 is driven to perform instantaneous hot water supply processing. Specifically, the controller 1 drives the expander 31 and the compressor 33 in the CO ₂ cycle S1, and supplies water supplied from the water supply port 11 to the water heat exchanger 15. The switching valve 14 is switched in a direction to perform, and the switching valve 16 is switched in a direction to supply the water supplied by the water heat exchanger 15 to the mixing valve 17. As a result, the water supplied from the water supply port 11 and supplied to the water heat exchanger 15 via the switching pipe 14 via the water pipe 10A is exchanged with the CO ₂ refrigerant by the water heat exchanger 15. As a result, hot water is supplied and the instantaneous hot water supply process supplied to the switching valve 16 is executed, and the process proceeds to step S60.

ステップＳ４０では，前記制御部１により，前記検知手段３により検知された外気温度が１５℃以下であるか否かが判断される。前記検知手段３により検知された外気温度が１５℃以下であれば（ステップＳ４０のＹｅｓ側），処理はステップＳ５０に移行される。前記検知手段３により検知された外気温度が１５℃より高ければ（ステップＳ４０のＮｏ側），処理はステップＳ４１に移行される。 In step S40, the control unit 1 determines whether or not the outside air temperature detected by the detection means 3 is 15 ° C. or less. If the outside air temperature detected by the detection means 3 is 15 ° C. or lower (Yes in step S40), the process proceeds to step S50. If the outside air temperature detected by the detection means 3 is higher than 15 ° C. (No side of step S40), the process proceeds to step S41.

ステップＳ４１では，前記Ｒ４１０ＡサイクルＳ２が駆動されて瞬間給湯処理が行われる。具体的には，前記制御部１により，前記給水口１１から供給された水を前記水熱交換器１５に供給する方向へ前記切り換え弁１４が切り換えられ，さらに前記水熱交換器１５により供給された水を前記混合弁１７に供給する方向へ前記切り換え弁１６が切り換えられる。一方，前記制御部１により前記Ｒ４１０ＡサイクルＳ２の前記四方弁４４が図１に示す実線経路に切り換えられるとともに，前記四方弁４４から供給された前記Ｒ４１０Ａ冷媒を前記水熱交換器１５に供給する方向に，前記切り換え弁４５が切り換えられ，更に，前記水熱交換器１５から供給された前記Ｒ４１０Ａ冷媒を前記膨張器４１に供給する方向に，前記切り換え弁４６が切り換えられる。続いて，前記膨張器４１，前記圧縮機４３が駆動されて，前記Ｒ４１０Ａ冷媒が前記配管４０Ａを循環することにより前記水熱交換器１５において前記水配管１０Ｂを流れる水が加熱される。このようにして，前記給水口１１から供給され前記水配管１０Ａを経由し前記切り換え弁１４を経て前記水熱交換器１５に供給された水が，前記水熱交換器１５により前記Ｒ４１０Ａ冷媒と熱交換されて温水（例えば約４５℃の温水）となり，前記切り換え弁１６に供給される瞬間給湯処理が実行され，処理はステップＳ６０に移行される。 In step S41, the R410A cycle S2 is driven to perform instantaneous hot water supply processing. Specifically, the control unit 1 switches the switching valve 14 in a direction to supply water supplied from the water supply port 11 to the water heat exchanger 15, and further supplies the water heat exchanger 15. The switching valve 16 is switched in the direction in which the water is supplied to the mixing valve 17. On the other hand, the control unit 1 switches the four-way valve 44 of the R410A cycle S2 to the solid line path shown in FIG. 1 and supplies the R410A refrigerant supplied from the four-way valve 44 to the water heat exchanger 15. In addition, the switching valve 45 is switched, and further, the switching valve 46 is switched in a direction to supply the R410A refrigerant supplied from the water heat exchanger 15 to the expander 41. Subsequently, the expander 41 and the compressor 43 are driven, and the R410A refrigerant circulates through the pipe 40A, whereby water flowing through the water pipe 10B is heated in the water heat exchanger 15. In this way, the water supplied from the water supply port 11 and supplied to the water heat exchanger 15 via the water pipe 10A and the switching valve 14 is heated by the water heat exchanger 15 with the R410A refrigerant and heat. The hot water (for example, hot water of about 45 ° C.) is exchanged and the hot water supply process supplied to the switching valve 16 is executed, and the process proceeds to step S60.

ステップＳ５０では，前記ステップ１０における当該ヒートポンプ式給湯機Ｘから温水を供給する給湯先が浴槽であるという結果と，前記ステップＳ３０における前記空気調和機の運転停止という判断結果と，前記ステップＳ４０における外気温度が１５℃以下という判断結果を受けて，前記ＣＯ₂サイクルＳ１及び前記Ｒ４１０ＡサイクルＳ２両方を駆動させて瞬間給湯処理が行われる。具体的には，前記制御部１により，前記給水口１１から供給された水を前記水熱交換器１５に供給する方向へ前記切り換え弁１４が切り換えられ，さらに前記水熱交換器１５により供給された水を前記混合弁１７に供給する方向へ前記切り換え弁１６が切り換えられる。一方，前記制御部１により前記Ｒ４１０ＡサイクルＳ２の前記四方弁４４が図１に示す実線経路に切り換えられるとともに，前記四方弁４４から供給された前記Ｒ４１０Ａ冷媒を前記水熱交換器１５に供給する方向に，前記切り換え弁４５が切り換えられ，更に，前記水熱交換器１５から供給された前記Ｒ４１０Ａ冷媒を前記膨張器４１に供給する方向に，前記切り換え弁４６が切り換えられる。続いて，前記ＣＯ₂サイクルＳ１の前記膨張器３１，前記圧縮機３３，前記Ｒ４１０ＡサイクルＳ２の前記膨張器４１，前記圧縮機４３が駆動される。これにより，前記給水口１１から供給され前記水配管１０Ａを経由し前記切り換え弁１４を経て前記水熱交換器１５に供給された水が，前記水熱交換器１５により前記Ｒ４１０Ａ冷媒及び前記ＣＯ₂冷媒と熱交換されて温水（例えば約５０℃の温水）となり，前記切り換え弁１６に供給される瞬間給湯処理が実行され，処理はステップＳ６０に移行される。
ここで，前記ステップＳ１４における外気温度が１５℃より高いという判断結果を受けて，前記Ｒ４１０ＡサイクルＳ２を駆動させる，或いは，前記ステップＳ１４における外気温度が１５℃以下という判断結果を受けて，前記ＣＯ₂サイクルＳ１を駆動させる，或いは，前記ステップＳ４０における外気温度が１５℃より高いという判断結果を受けて，前記Ｒ４１０ＡサイクルＳ２を駆動させる，或いは，前記ステップＳ４０における外気温度が１５℃以下という判断結果を受けて，前記ＣＯ₂サイクルＳ１及び前記Ｒ４１０ＡサイクルＳ２を駆動させる前記制御部１が，使用サイクル決定手段の一例に相当する。 In step S50, the result that the hot water supply destination for supplying hot water from the heat pump hot water heater X in step 10 is a bathtub, the determination result that the operation of the air conditioner is stopped in step S30, and the outside air in step S40. In response to the determination result that the temperature is 15 ° C. or less, instantaneous hot water supply processing is performed by driving both the CO ₂ cycle S1 and the R410A cycle S2. Specifically, the control unit 1 switches the switching valve 14 in a direction to supply water supplied from the water supply port 11 to the water heat exchanger 15, and further supplies the water heat exchanger 15. The switching valve 16 is switched in the direction in which the water is supplied to the mixing valve 17. On the other hand, the control unit 1 switches the four-way valve 44 of the R410A cycle S2 to the solid line path shown in FIG. 1 and supplies the R410A refrigerant supplied from the four-way valve 44 to the water heat exchanger 15. In addition, the switching valve 45 is switched, and further, the switching valve 46 is switched in a direction to supply the R410A refrigerant supplied from the water heat exchanger 15 to the expander 41. Subsequently, the expander 31 and the compressor 33 in the CO ₂ cycle S1, the expander 41 and the compressor 43 in the R410A cycle S2 are driven. As a result, the water supplied from the water supply port 11 and supplied to the water heat exchanger 15 through the water pipe 10A and the switching valve 14 is converted into the R410A refrigerant and the CO ₂ by the water heat exchanger 15. Heat is exchanged with the refrigerant to become hot water (for example, hot water of about 50 ° C.), an instantaneous hot water supply process supplied to the switching valve 16 is executed, and the process proceeds to step S60.
Here, in response to the determination result that the outside air temperature in step S14 is higher than 15 ° C., the R410A cycle S2 is driven, or in response to the determination result that the outside air temperature in step S14 is 15 ° C. or less. ₂ cycle S1 is driven, or the R410A cycle S2 is driven in response to the determination result that the outside air temperature in step S40 is higher than 15 ° C., or the outside air temperature in step S40 is determined to be 15 ° C. or less. In response, the control unit 1 for driving the CO ₂ cycle S1 and the R410A cycle S2 corresponds to an example of a use cycle determining unit.

ステップＳ６０では，前記ステップＳ３１或いは前記ステップＳ４１或いは前記ステップＳ５０で加熱された温水が，浴槽に供給される。前記ステップＳ３１或いは前記ステップＳ４１或いは前記ステップＳ５０で加熱されて前記切り換え弁１６に供給された温水は，前記混合弁１７が前記制御部１によって制御されることにより前記給水口１１から供給された水と混合されて，前記ステップＳ２０で開栓された前記二方弁１９を経て浴槽に供給され，処理は終了する。
ここで，前記浴槽への給水指令を受けたときは，前記ＣＯ₂サイクルＳ１及び／又は前記Ｒ４１０ＡサイクルＳ２を駆動させて前記水熱加熱器１５により加熱された水をもっぱら前記浴槽に供給するとともに，前記浴槽への給水指令以外の給水指令を受けたときには，前記リザーブタンク１２に貯留された水を前記浴槽以外の給湯先に供給する処理を実行する前記制御部１が，給湯先切り換え手段の一例に相当する。 In step S60, the hot water heated in step S31 or step S41 or step S50 is supplied to the bathtub. The hot water heated in step S31 or step S41 or step S50 and supplied to the switching valve 16 is the water supplied from the water supply port 11 when the mixing valve 17 is controlled by the control unit 1. And is supplied to the bathtub through the two-way valve 19 opened in step S20, and the process ends.
Here, when the water supply command to the bathtub is received, the CO ₂ cycle S1 and / or the R410A cycle S2 is driven to supply water heated by the hydrothermal heater 15 exclusively to the bathtub. When the water supply command other than the water supply command to the bathtub is received, the control unit 1 for executing the process of supplying the water stored in the reserve tank 12 to the hot water supply destination other than the bathtub is provided with a hot water supply destination switching means. It corresponds to an example.

このように，多量の温水を使用する浴槽へは前記水熱交換器１５により加熱された水を供給し，前記浴槽以外へは前記リザーブタンク１２に貯留された温水を供給することによって，前記浴槽以外の給湯先に安定した温度の温水を供給するとともに，浴槽へ多量の温水を使うことによる湯切れのおそれを低減することができる。
これにより，蛇口やシャワーなどから供給される温水の温度ムラにより利用者が望んでいない高温や低温の温水が供給されてしまう不都合が解消される。
本実施の形態では，多量に温水を使用する浴槽へは前記リザーブタンク１２に貯留された温水から供給されないので，前記リザーブタンク１２の容量は，従来の貯湯タンクの容量と比べて少ない。このような場合，前記リザーブタンク１２の水を所定の温度まで沸かす時間が従来の貯湯タンクに貯留された水を沸かす時間より短いという副次的効果がある。
なお，本実施の形態では，前記ヒートポンプユニットＵに前記リザーブタンク１２が備えられた構成であるが，前記ヒートポンプユニットＵと接続した貯湯タンクから浴槽以外の給湯先への給湯を実行する構成でもかまわない。
また，本発明は，前記ヒートポンプユニットＵに備えられた前記水熱交換器１５により熱交換された温水を直接浴槽に供給するとともに，前記ヒートポンプユニットＵに備えられた前記水熱交換器１５或いは新たに設けられた水熱交換器により前記水配管１０を流れる温水と前記浴槽に貯留された温水とを熱交換させて，該浴槽に貯留された温水を加熱或いは保温する追い焚き機能を設けたヒートポンプ式給湯機にも適用される。 In this way, by supplying the water heated by the water heat exchanger 15 to the bathtub using a large amount of hot water, and supplying the hot water stored in the reserve tank 12 to other than the bathtub, the bathtub While supplying hot water at a stable temperature to other hot water supply destinations, the risk of running out of hot water due to the use of a large amount of hot water in the bathtub can be reduced.
This eliminates the inconvenience of supplying hot or cold hot water not desired by the user due to uneven temperature of hot water supplied from a faucet or shower.
In this embodiment, since the hot water stored in the reserve tank 12 is not supplied to the bathtub that uses a large amount of hot water, the capacity of the reserve tank 12 is smaller than the capacity of the conventional hot water storage tank. In such a case, there is a secondary effect that the time for boiling the water in the reserve tank 12 to a predetermined temperature is shorter than the time for boiling the water stored in the conventional hot water storage tank.
In this embodiment, the reserve tank 12 is provided in the heat pump unit U. However, a configuration in which hot water is supplied from a hot water storage tank connected to the heat pump unit U to a hot water supply destination other than a bathtub may be used. Absent.
In addition, the present invention supplies the hot water heat-exchanged by the water heat exchanger 15 provided in the heat pump unit U directly to the bathtub, and the water heat exchanger 15 provided in the heat pump unit U or a new one. A heat pump having a reheating function that heats or keeps the hot water stored in the bathtub by exchanging heat between the hot water flowing in the water pipe 10 and the hot water stored in the bathtub by a water heat exchanger provided in Applicable to water heaters.

本実施の形態に係るヒートポンプ式給湯機Ｘの概略構成を示す模式図。The schematic diagram which shows schematic structure of the heat pump type water heater X which concerns on this Embodiment. 本実施の形態に係るヒートポンプ式給湯機Ｘの制御系統のブロック図。The block diagram of the control system of the heat pump type water heater X which concerns on this Embodiment. 本実施の形態に係るヒートポンプ式給湯機Ｘに備えられた制御部１により実行される給湯先に応じて切り換えられる給湯処理の手順についてその一例を説明するためのフローチャート。The flowchart for demonstrating the example about the procedure of the hot water supply process switched according to the hot water supply destination performed by the control part 1 with which the heat pump type hot water heater X which concerns on this Embodiment was equipped.

Explanation of symbols

１０…水配管
１１…給水口
１２…リザーブタンク
１３…循環ポンプ
１４，１６，４５，４６…切り換え弁
１５…水熱交換器
１７…混合弁
１８…給湯口
１９…二方弁
２０…温度センサ
３０，４０…配管
３１，４１…膨張器
３２，４２…室外空気熱交換器
３３，４３…圧縮機
４４…四方弁
４７…室内空気熱交換器 DESCRIPTION OF SYMBOLS 10 ... Water piping 11 ... Water supply port 12 ... Reserve tank 13 ... Circulation pump 14, 16, 45, 46 ... Switching valve 15 ... Water heat exchanger 17 ... Mixing valve 18 ... Hot water supply port 19 ... Two-way valve 20 ... Temperature sensor 30 , 40 ... piping 31, 41 ... expanders 32, 42 ... outdoor air heat exchangers 33, 43 ... compressor 44 ... four-way valve 47 ... indoor air heat exchanger

Claims

A first heat pump cycle in which the first refrigerant is circulated through at least the first expander and the first compressor, and a second refrigerant is circulated through the at least second expander and the second compressor. A second heat pump cycle, a water heat exchanger for exchanging heat between the first refrigerant and the second refrigerant and water, and a storage means for storing water heated by the water heat exchanger A heat pump type water heater equipped with
When the water supply instruction to the bathtub is received, the first heat pump cycle and / or the second heat pump cycle is driven to supply water heated by the water heat exchanger exclusively to the bathtub, and the bathtub When the water supply command other than the water supply command is received, the heat pump type hot water heater is provided with hot water supply destination switching means for supplying the water stored in the storage means to a hot water supply destination other than the bathtub.

The heat pump type hot water heater according to claim 1, wherein the storage means is a hot water storage tank having a capacity smaller than a hot water supply capacity to the bathtub.

The heat pump type hot water heater according to claim 1, wherein the storage means is a hot water storage tank of approximately 100 liters or less.

The heat pump type hot water heater according to claim 1, wherein the storage means is a hot water storage tank having a capacity within approximately 80% of the bathtub.

The heat pump type hot water heater according to any one of claims 1 to 4, wherein the first refrigerant is a carbon dioxide refrigerant, and the second refrigerant is an HFC refrigerant.

6. A detection means for detecting an outside air temperature, and a use cycle determination means for determining a heat pump cycle to be driven according to the outside air temperature detected by the detection means. The described heat pump type hot water heater.