JP5228789B2

JP5228789B2 - Water heater

Info

Publication number: JP5228789B2
Application number: JP2008271452A
Authority: JP
Inventors: 信宏竹田; 哲 ▲吉▼田
Original assignee: Noritz Corp
Current assignee: Noritz Corp
Priority date: 2008-10-21
Filing date: 2008-10-21
Publication date: 2013-07-03
Anticipated expiration: 2028-10-21
Also published as: JP2010101524A

Description

本発明は、循環回路の循環温水が主熱交換器において燃焼熱との熱交換により加熱される一方、その加熱された循環回路の循環温水を熱源とする第１の補助熱交換器と、主熱交換器を通過した燃焼排ガスから潜熱を回収するための第２の補助熱交換器とによって給湯回路の給水が加熱されるように構成された給湯装置に関する。 In the present invention, the circulating hot water in the circulation circuit is heated by heat exchange with combustion heat in the main heat exchanger, while the first auxiliary heat exchanger using the heated circulating water in the circulation circuit as a heat source, The present invention relates to a hot water supply apparatus configured such that water supplied from a hot water supply circuit is heated by a second auxiliary heat exchanger for recovering latent heat from combustion exhaust gas that has passed through the heat exchanger.

従来、給湯回路の給水を加熱するために、燃焼熱との熱交換により加熱する主熱交換器に他に、その主熱交換器を通過した燃焼排ガスから潜熱を回収するための補助熱交換器を備えた給湯装置が知られている（例えば特許文献１又は特許文献２を参照）。 Conventionally, an auxiliary heat exchanger for recovering latent heat from combustion exhaust gas that has passed through the main heat exchanger, in addition to the main heat exchanger that heats by heat exchange with the combustion heat, in order to heat the feed water in the hot water supply circuit Is known (for example, see Patent Document 1 or Patent Document 2).

特許文献１では、主熱交換器への給水管を途中で分岐させ、その分岐管によって補助熱交換器に給水し得るようにするとともに、この分岐管に介装した流量制御弁を外気温検出値等に基づいて制御することにより、補助熱交換器における潜熱回収率を調整して燃焼排ガスの白煙化を防止するようにすることが提案されている。 In Patent Document 1, the water supply pipe to the main heat exchanger is branched halfway, and the auxiliary heat exchanger can be supplied with water through the branch pipe, and the flow control valve interposed in the branch pipe is used to detect the outside air temperature. It has been proposed to adjust the latent heat recovery rate in the auxiliary heat exchanger to prevent the combustion exhaust gas from becoming white smoke by controlling based on the value or the like.

又、特許文献２では、給水管により補助熱交換器に給水した後に主熱交換器に給水するようにするとともに、バイパス管を補助熱交換器の下流側位置の給水管から分岐させて主熱交換器の下流側位置に連通させるように設けることにより、補助熱交換器の上流側位置の給水管から分岐させる場合と比べ、潜熱の回収効率を高めるようにすることが提案されている。 In Patent Document 2, water is supplied to the main heat exchanger after supplying water to the auxiliary heat exchanger through the water supply pipe, and the main heat is supplied by branching the bypass pipe from the water supply pipe at the downstream position of the auxiliary heat exchanger. It has been proposed to improve the recovery efficiency of latent heat by providing it so as to communicate with the downstream position of the exchanger as compared with the case where it branches from the water supply pipe at the upstream position of the auxiliary heat exchanger.

特許第３７２２３１７号公報Japanese Patent No. 3722317 特開２００１−２４１７６８号公報JP 2001-241768 A

ところで、温水循環式の暖房装置の如く燃焼バーナの燃焼熱との熱交換により加熱される温水を循環させる循環回路を備え、この循環回路から熱分配を受けて給湯回路の給水を加熱するようにした給湯装置が考えられている。すなわち、図３に例示するように、暖房端末Ａとの間で循環される熱媒である温水を主熱交換器２１において燃焼バーナ５２の燃焼熱により熱交換加熱しながら循環させるという循環回路２００を備える一方、その熱交換加熱された温水を熱源とする第１補助熱交換器７０１と、上記主熱交換器２１を通過した燃焼排ガスから潜熱を回収する第２補助熱交換器７０２とを給湯回路７００用の加熱源として別に備えるようにする。そして、給水路７０３からの給水をまず第２補助熱交換器７０２に通して潜熱回収より予熱した上で、第１補助熱交換器７０１に通して循環回路２００の温水との液−液熱交換により加熱して給湯するようにするというものである。 By the way, it has a circulation circuit which circulates the hot water heated by heat exchange with the combustion heat of the combustion burner like a warm water circulation type heating device, and receives the heat distribution from this circulation circuit to heat the feed water in the hot water supply circuit. A hot water supply device is considered. That is, as illustrated in FIG. 3, a circulation circuit 200 that circulates hot water, which is a heat medium circulated with the heating terminal A, in the main heat exchanger 21 while performing heat exchange heating with the combustion heat of the combustion burner 52. On the other hand, a first auxiliary heat exchanger 701 having the heat exchange heated hot water as a heat source and a second auxiliary heat exchanger 702 for recovering latent heat from the combustion exhaust gas that has passed through the main heat exchanger 21 A separate heating source for the circuit 700 is provided. Then, the water supply from the water supply path 703 is first passed through the second auxiliary heat exchanger 702 and preheated from the latent heat recovery, and then passed through the first auxiliary heat exchanger 701 and then liquid-liquid heat exchange with the hot water in the circulation circuit 200. The hot water is heated by heating.

しかしながら、このような構成の給湯装置においては、給水路７０３からの給水は第２補助熱交換器７０２と第１補助熱交換器７０１との２つの熱交換器を連続して通過する結果、通水抵抗を受けて圧力損失が高くなるという不都合を生じることになる。 However, in the hot water supply apparatus having such a configuration, the water supplied from the water supply passage 703 passes through the two heat exchangers, the second auxiliary heat exchanger 702 and the first auxiliary heat exchanger 701, as a result. This causes a disadvantage that the pressure loss increases due to water resistance.

本発明は、このような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、熱効率の向上を図りつつ給湯回路における圧力損失の低減化をも図り得る給湯装置を提供することにある。より詳細には、燃焼バーナを熱源とする循環回路を介して熱分配を受けるように構成した給湯回路において、循環回路からの熱分配に基づく熱効率を最大限に向上させつつ、給湯回路全体の圧力損失を低減化させ得る給湯装置を提供することにある。 This invention is made | formed in view of such a situation, The place made into the objective is providing the hot water supply apparatus which can aim at reduction of the pressure loss in a hot water supply circuit, aiming at the improvement of thermal efficiency. . More specifically, in a hot water supply circuit configured to receive heat distribution through a circulation circuit using a combustion burner as a heat source, the pressure of the entire hot water supply circuit is improved while maximizing the thermal efficiency based on the heat distribution from the circulation circuit. An object of the present invention is to provide a hot water supply apparatus capable of reducing loss.

上記目的を達成するために、第１の発明では、循環熱媒が主熱交換器において燃焼バーナの燃焼熱により熱交換加熱される循環回路と、この循環回路から熱分配を受けて間接加熱される給湯回路とを備えてなり、この給湯回路は、給水路と、上記循環回路の循環熱媒を熱源にして給水を加熱する第１補助熱交換器と、上記燃焼バーナの燃焼排ガスから潜熱を回収して給水を予熱する第２補助熱交換器と、給湯路とを備えて構成されている給湯装置を対象にして次の特定事項を備えるようにした。すなわち、上記給水路として、上記第１補助熱交換器の入口に接続された第１分岐給水路と、上記第２補助熱交換器の入口に接続された第２分岐給水路とに分岐する配設にし、上記給湯路として、上記第１補助熱交換器の出口と、上記第２補助熱交換器の出口とを合流させる配設にする（請求項１）。 In order to achieve the above object, according to the first aspect of the present invention, the circulating heat medium is indirectly heated by receiving heat distribution from the circulation circuit in which heat is heated by the combustion heat of the combustion burner in the main heat exchanger. The hot water supply circuit includes a water supply path, a first auxiliary heat exchanger that heats the feed water using the circulating heat medium of the circulation circuit as a heat source, and latent heat from the combustion exhaust gas of the combustion burner. The following specific items are provided for a hot water supply apparatus configured to include a second auxiliary heat exchanger that recovers and preheats the water supply and a hot water supply path. That is, the water supply channel is branched into a first branch water supply channel connected to the inlet of the first auxiliary heat exchanger and a second branch water supply channel connected to the inlet of the second auxiliary heat exchanger. The outlet of the first auxiliary heat exchanger and the outlet of the second auxiliary heat exchanger are combined as the hot water supply path (Claim 1).

この第１の発明の場合、給湯回路において、燃焼バーナを必要とせずに循環回路で用いられる循環熱媒を活用した間接加熱によって給水の主加熱が得られる一方、その循環回路での燃焼バーナの燃焼排ガスからの潜熱回収による給水の予熱が得られるというように熱効率の向上が図られた状態を維持しつつ、主加熱のための第１補助熱交換器と、予熱のための第２補助熱交換器とに対し第１分岐給水路及び第２分岐給水路によって給水を分配して並行に通水されるため、２つの熱交換器に直列に通水させる場合に比べ、給湯回路における圧力損失を可及的に低減させることが可能となる。 In the case of the first invention, in the hot water supply circuit, the main heating of the feed water is obtained by indirect heating utilizing the circulating heat medium used in the circulation circuit without the need for the combustion burner, while the combustion burner in the circulation circuit is obtained. The first auxiliary heat exchanger for the main heating and the second auxiliary heat for the preheating are maintained while maintaining the state in which the heat efficiency is improved such that the preheating of the feed water is obtained by recovering the latent heat from the combustion exhaust gas. Since water is distributed to the exchanger by the first branch water supply channel and the second branch water supply channel, the water loss is passed through in parallel, so that the pressure loss in the hot water supply circuit is larger than when water is passed through the two heat exchangers in series. Can be reduced as much as possible.

第２の発明では、循環熱媒が主熱交換器において燃焼バーナの燃焼熱により熱交換加熱される循環回路と、この循環回路から熱分配を受けて間接加熱される給湯回路とを備えてなり、この給湯回路は、給水路と、上記循環回路の循環熱媒を熱源にして給水を加熱する第１補助熱交換器と、上記燃焼バーナの燃焼排ガスから潜熱を回収して給水を予熱する第２補助熱交換器と、給湯路とを備えて構成されている給湯装置を対象にして、次の特定事項を備えるようにした。すなわち、上記給水路として、上記第１補助熱交換器の入口に接続された第１分岐給水路と、上記第２補助熱交換器の入口に接続された第２分岐給水路とに分岐する配設にし、上記給湯路として、上記第１補助熱交換器の出口と、上記第２補助熱交換器の出口とを合流させる配設にする。加えて、上記給水路の分岐部位から上記給湯路の合流部位までの間に、上記給水路からの給水の第１補助熱交換器及び第２補助熱交換器に対する分配比を変更調整する通水分配制御手段を配設することとした（請求項２）。 In the second invention, the circulating heat medium is provided with a circulation circuit in which heat is heated by the combustion heat of the combustion burner in the main heat exchanger, and a hot water supply circuit indirectly heated by receiving heat distribution from the circulation circuit. The hot water supply circuit includes a water supply path, a first auxiliary heat exchanger that heats the feed water using the circulating heat medium of the circulation circuit as a heat source, and a first heater that recovers latent heat from the combustion exhaust gas of the combustion burner and preheats the feed water. The following specific items are provided for a hot water supply apparatus that includes two auxiliary heat exchangers and a hot water supply path. That is, the water supply channel is branched into a first branch water supply channel connected to the inlet of the first auxiliary heat exchanger and a second branch water supply channel connected to the inlet of the second auxiliary heat exchanger. The outlet for the first auxiliary heat exchanger and the outlet for the second auxiliary heat exchanger are combined as the hot water supply path. In addition, the water flow for changing and adjusting the distribution ratio of the water supplied from the water supply channel to the first auxiliary heat exchanger and the second auxiliary heat exchanger between the branch portion of the water supply channel and the junction of the hot water supply channel Distribution control means is provided (claim 2).

この第２の発明の場合、第１の発明で得られる作用の全てが得られる上に、さらにより一層の熱効率の向上を図り得ることになる。すなわち、通水分配制御手段によって例えば第２分岐給水路の側への給水の分配比をゼロ（遮断）にしたり低くしたりすると、第１分岐給水路の側への給水の分配比がそれに対応して高くなる。つまり、燃焼バーナの燃焼初期段階等の潜熱回収があまり期待できない段階には第２補助熱交換器への通水分配をゼロ又は低くして、給水のほぼ全量を第１補助熱交換器での液−液熱交換による主加熱に切換えたり、潜熱回収が期待できる燃焼段階になれば第２補助熱交換器への通水分配を増大させて潜熱回収を十分に活用して熱回収させるように調整することが可能になる。これにより、潜熱回収があまり期待し得ない燃焼初期段階であっても定常燃焼段階と同じ常に一定の分配比で固定的に給水の通水分配をし続ける場合と比べ、より一層の熱効率の向上を図り得ることになる。又、給湯回路の側での熱回収の観点から見ると、一定の給湯温度まで昇温させるための燃焼バーナの燃料量を相対的に低減させ得ることにもつながることになる。 In the case of the second invention, all of the effects obtained by the first invention can be obtained, and the thermal efficiency can be further improved. That is, when the distribution ratio of the water supply to the second branch water supply channel is made zero (blocked) or lowered by the water distribution control means, for example, the distribution ratio of the water supply to the first branch water supply channel corresponds to that. And get higher. In other words, at the stage where the latent heat recovery such as the initial stage of combustion of the combustion burner cannot be expected so much, the distribution of water to the second auxiliary heat exchanger is made zero or low, and almost all of the feed water is supplied to the first auxiliary heat exchanger. Switch to the main heating by liquid-liquid heat exchange or increase the water distribution to the second auxiliary heat exchanger at the combustion stage where latent heat recovery can be expected so that the latent heat recovery can be fully utilized to recover the heat. It becomes possible to adjust. As a result, even in the early combustion stage where latent heat recovery cannot be expected much, the thermal efficiency is further improved compared to the case where the water supply is constantly distributed with a constant distribution ratio as in the steady combustion stage. Can be planned. Further, from the viewpoint of heat recovery on the hot water supply circuit side, the amount of fuel in the combustion burner for raising the temperature to a constant hot water supply temperature can be relatively reduced.

以上、説明したように、請求項１の給湯装置によれば、給湯回路において、循環回路で用いられる循環熱媒を活用した間接加熱によって給水の主加熱と、その循環回路での燃焼バーナの燃焼排ガスからの潜熱回収による給水の予熱とによって熱効率の向上が図られた状態を維持しつつ、主加熱のための第１補助熱交換器と、予熱のための第２補助熱交換器とに対し第１分岐給水路及び第２分岐給水路によって給水を分配して並行に通水させることができ、２つの熱交換器に直列に通水させる場合に比べ、給湯回路における圧力損失を可及的に低減させることができるようになる。 As described above, according to the hot water supply apparatus of claim 1, in the hot water supply circuit, the main heating of the feed water by indirect heating utilizing the circulating heat medium used in the circulation circuit, and the combustion of the combustion burner in the circulation circuit While maintaining the state in which the heat efficiency is improved by preheating the feed water by collecting latent heat from the exhaust gas, the first auxiliary heat exchanger for main heating and the second auxiliary heat exchanger for preheating Water supply can be distributed through the first branch water supply channel and the second branch water supply channel and allowed to flow in parallel, and the pressure loss in the hot water supply circuit is as much as possible compared with the case where water is passed through two heat exchangers in series. Can be reduced.

請求項２の給湯装置によれば、請求項１の給湯装置により得られる効果に加えて、さらにより一層の熱効率の向上を図ることができることになる。すなわち、通水分配制御手段により、燃焼バーナの燃焼初期段階等の潜熱回収があまり期待できない段階には第２補助熱交換器への通水分配をゼロ又は低くして、給水のほぼ全量を第１補助熱交換器での液−液熱交換による主加熱に切換えたり、潜熱回収が期待できる燃焼段階になれば第２補助熱交換器への通水分配を増大させて潜熱回収を十分に活用して熱回収させるように調整したりすることができるようになる。これにより、潜熱回収があまり期待し得ない燃焼初期段階であっても定常燃焼段階と同じ常に一定の分配比で固定的に給水の通水分配をし続ける場合と比べ、より一層の熱効率の向上を図ることができるようになる。又、給湯回路の側での熱回収の観点から見ると、一定の給湯温度まで昇温させるための燃焼バーナの燃料量を相対的に低減させることができるようにもなる。 According to the hot water supply device of claim 2, in addition to the effect obtained by the hot water supply device of claim 1, it is possible to further improve the thermal efficiency. That is, when the latent heat recovery such as the initial stage of combustion of the combustion burner cannot be expected by the water distribution control means, the water distribution to the second auxiliary heat exchanger is made zero or low, and almost all of the water supply is reduced. 1 Switch to main heating by liquid-liquid heat exchange in the auxiliary heat exchanger or increase the water distribution to the second auxiliary heat exchanger at the combustion stage where latent heat recovery can be expected to fully utilize the latent heat recovery And can be adjusted to recover heat. As a result, even in the early combustion stage where latent heat recovery cannot be expected much, the thermal efficiency is further improved compared to the case where the water supply is constantly distributed with a constant distribution ratio as in the steady combustion stage. Can be planned. Further, from the viewpoint of heat recovery on the hot water supply circuit side, the amount of fuel in the combustion burner for raising the temperature to a constant hot water supply temperature can be relatively reduced.

以下、本発明の実施形態を図面に基づいて説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

＜第１実施形態＞
図１は、本発明の第１実施形態に係る給湯装置を示す。この給湯装置は、循環回路としての暖房回路２と、給湯回路３と、ふろ追い焚き回路４とを備えた複合熱源機として構成され、さらに１つの熱源である缶体５からの熱を暖房回路２、給湯回路３及びふろ追い焚き回路４の３つの回路に熱分配するという１缶３分配式の熱源機として構成されている。 <First Embodiment>
FIG. 1 shows a hot water supply apparatus according to a first embodiment of the present invention. This hot water supply apparatus is configured as a composite heat source machine including a heating circuit 2 as a circulation circuit, a hot water supply circuit 3 and a bathing circuit 4, and further, heat from the can 5 serving as one heat source is supplied to the heating circuit. 2. It is configured as a 1 can 3 distribution type heat source machine that distributes heat to three circuits of a hot water supply circuit 3 and a bath reheating circuit 4.

暖房回路２は、温水循環式の暖房機能を実現するためのものであり、機外の暖房端末Ａに対し加熱後の高温水を循環熱媒として循環供給して暖房を行うようになっている。この暖房回路２は、缶体５に内蔵された主熱交換器２１及び暖房用補助熱交換器２２と、温水循環路２３と、膨張タンク２４と、暖房用循環ポンプ２５とを備えて構成されている。上記缶体５には送風ファン５１から燃焼用空気の供給を受けて燃焼作動する燃焼バーナ５２が内蔵され、主熱交換器２１はこの燃焼バーナ５２の燃焼熱（顕熱）により熱交換加熱されるようになっている。加えて、この主熱交換器２１を通過した後に排気口５３から排出されるまでの燃焼排ガスの流路には、その燃焼排ガスから潜熱を回収するための暖房用補助熱交換器２２と、後述の給湯用第２補助熱交換器３２とが順に介装されている。 The heating circuit 2 is for realizing a heating function of a hot water circulation type, and performs heating by circulatingly supplying high-temperature water after heating to a heating terminal A outside the machine as a circulating heat medium. . The heating circuit 2 includes a main heat exchanger 21 and a heating auxiliary heat exchanger 22 incorporated in the can 5, a hot water circulation path 23, an expansion tank 24, and a heating circulation pump 25. ing. The can 5 has a built-in combustion burner 52 that receives combustion air supplied from the blower fan 51 and operates to burn. The main heat exchanger 21 is heat-exchanged and heated by the combustion heat (sensible heat) of the combustion burner 52. It has become so. In addition, an auxiliary heat exchanger 22 for heating for recovering latent heat from the combustion exhaust gas, and a heating auxiliary heat exchanger 22 which will be described later, are disposed in the flow path of the combustion exhaust gas after passing through the main heat exchanger 21 and discharged from the exhaust port 53. And a second auxiliary heat exchanger 32 for hot water supply are sequentially provided.

そして、上記温水循環路２３においては、暖房端末Ａで放熱されて低温状態となった低温水がその暖房戻路２３ａを通して膨張タンク２４に戻され、この膨張タンク２４に貯留される低温水が暖房用循環ポンプ２５の作動により上記暖房用補助熱交換器２２に送られ、これを通過する間に燃焼排ガスから潜熱を回収した上で主熱交換器２１に送られることになる。この主熱交換器２１を通過する間に上記低温水は燃焼バーナ５２の燃焼熱により熱交換加熱されて所定温度の高温水となり、この高温水が暖房往路２３ｂを通して上記の暖房端末Ａに供給されることになる。供給された高温水はこの暖房端末Ａで放熱されて上記の低温水になって膨張タンク２４に戻され、以上が繰り返されるようになっている。 In the hot water circulation path 23, the low-temperature water that has been radiated from the heating terminal A and brought into a low-temperature state is returned to the expansion tank 24 through the heating return path 23a, and the low-temperature water stored in the expansion tank 24 is heated. It is sent to the heating auxiliary heat exchanger 22 by the operation of the circulation pump 25, and after passing through this, the latent heat is recovered from the combustion exhaust gas and then sent to the main heat exchanger 21. While passing through the main heat exchanger 21, the low-temperature water is heat-exchanged and heated by the combustion heat of the combustion burner 52 to become high-temperature water having a predetermined temperature, and this high-temperature water is supplied to the heating terminal A through the heating forward path 23b. Will be. The supplied high temperature water is dissipated by the heating terminal A to become the above low temperature water and returned to the expansion tank 24, and the above is repeated.

なお、上記の高温水は暖房往路２３ｂの下流端の接続口２３１に接続された配管を通して暖房端末Ａに供給され、暖房端末Ａからの低温水は暖房戻路２３ａの上流端の接続口２３２に接続された配管を通して戻されるようになっている。 The high temperature water is supplied to the heating terminal A through a pipe connected to the downstream end connection port 231 of the heating forward path 23b, and the low temperature water from the heating terminal A is supplied to the upstream end connection port 232 of the heating return path 23a. It is designed to be returned through connected piping.

給湯回路３は、給湯機能を実現するためのものであり、機外の給湯カランＢが開かれると給湯回路３に給水される水道水等を加熱した上で給湯カランＢに対し給湯するようになっている。この給湯回路３は、上記暖房回路２で生成される高温水を熱源として液−液熱交換する給湯用第１補助熱交換器３１と、上記缶体５内で生成される燃焼排ガスから潜熱を回収する給湯用第２補助熱交換器３２と、給水路３３と、給湯路３４とを備えて構成されている。給湯用第１補助熱交換器３１の熱源側には暖房回路２から高温水を熱源として供給する熱源供給路２６が接続され、この熱源供給路２６は暖房往路２３ｂの途中部位２３３から分岐して暖房往路２３ｂの高温水を上記給湯用第１補助熱交換器３１に供給する一方、被加熱側の給水との熱交換後に低温となった低温水を暖房戻路２３ａの途中部位２３４に戻すように配設されている。 The hot water supply circuit 3 is for realizing a hot water supply function. When the hot water supply curan B outside the machine is opened, the hot water supplied to the hot water supply circuit 3 is heated and hot water is supplied to the hot water supply curan B. It has become. The hot water supply circuit 3 generates latent heat from the hot water first auxiliary heat exchanger 31 that performs liquid-liquid heat exchange using the high-temperature water generated in the heating circuit 2 as a heat source, and the combustion exhaust gas generated in the can 5. A hot water supply second auxiliary heat exchanger 32 to be recovered, a water supply channel 33, and a hot water supply channel 34 are provided. A heat source supply path 26 that supplies high-temperature water as a heat source from the heating circuit 2 is connected to the heat source side of the first auxiliary heat exchanger 31 for hot water supply, and this heat source supply path 26 branches off from a midway part 233 of the heating forward path 23b. While supplying the high temperature water of the heating outbound path 23b to the first auxiliary heat exchanger 31 for hot water supply, the low temperature water that has become low temperature after heat exchange with the heated water supply is returned to the midway part 234 of the heating return path 23a. It is arranged.

そして、上流端の接続口３３１に水道管等が接続された給水路３３は、その下流側の部位である分岐部位３３２で第１分岐給水路３３ａと、第２分岐給水路３３ｂとの２方向に分岐されている。第１分岐給水路３３ａは、その下流端が給湯用第１補助熱交換器３１の被加熱側に接続され、第１分岐給水路３３ａからの給水が給湯用第１補助熱交換器３１において上記の高温水との液−液熱交換により加熱された後に給湯路３４に出湯されるようになっている。一方、第２分岐給水路３３ｂの下流端は給湯用第２補助熱交換器３２の入口に接続され、第２分岐給水路３３ｂからの給水が給湯用第２補助熱交換器３２を通過する間に缶体５内の燃焼排ガスの潜熱との熱交換により加熱された後に出口から給湯接続路３５に出湯されるようになっている。この給湯接続路３５の下流端は給湯路３４に合流、つまり、給湯用第１補助熱交換器３１をバイパスしてその下流側の部位（合流部位３４１）で給湯路３４に合流するように接続され、この合流部位３４１において第１補助熱交換器３１で液−液熱交換により加熱された湯と、第２補助熱交換器３２で潜熱回収により加熱された湯とが互いに合流されるようになっている。合流された湯は、給湯路３４の下流端の接続口３４２に接続された配管を通して給湯カランＢまで給湯されるようになっている。 And the water supply path 33 by which the water pipe etc. was connected to the connection port 331 of an upstream end is two directions of the 1st branch water supply path 33a and the 2nd branch water supply path 33b in the branch site | part 332 which is the downstream site | part. It is branched to. The downstream end of the first branch water supply path 33 a is connected to the heated side of the first auxiliary heat exchanger 31 for hot water supply, and the water supply from the first branch water supply path 33 a is the above in the first auxiliary heat exchanger 31 for hot water supply. After being heated by liquid-liquid heat exchange with high-temperature water, the hot water is discharged to the hot water supply passage 34. On the other hand, the downstream end of the second branch water supply passage 33b is connected to the inlet of the second auxiliary heat exchanger 32 for hot water supply, and the water supplied from the second branch water supply passage 33b passes through the second auxiliary heat exchanger 32 for hot water supply. After being heated by heat exchange with the latent heat of the combustion exhaust gas in the can 5, the hot water is discharged from the outlet to the hot water supply connection path 35. The downstream end of the hot water supply connection path 35 joins the hot water supply path 34, that is, is connected so as to bypass the first auxiliary heat exchanger 31 for hot water supply and join the hot water supply path 34 at a downstream site (merging site 341). Thus, the hot water heated by the liquid-liquid heat exchange in the first auxiliary heat exchanger 31 and the hot water heated by the latent heat recovery in the second auxiliary heat exchanger 32 are merged with each other at the joining portion 341. It has become. The joined hot water is supplied to the hot water supply curan B through a pipe connected to the connection port 342 at the downstream end of the hot water supply passage 34.

ふろ追い焚き回路４は、浴槽Ｃ内の浴槽水を追い焚きするためのものであり、上記暖房回路２で生成される高温水を熱源として液−液熱交換する追い焚き用補助熱交換器４１と、ふろ戻路４２ａ及びふろ往路４２ｂからなる追い焚き循環路４２と、追い焚き用循環ポンプ４３とを備えて構成されている。追い焚き用補助熱交換器４１の熱源側には暖房回路２から高温水を熱源として供給する熱源供給路２７が接続され、この熱源供給路２７は暖房往路２３ｂの途中部位２３３から分岐して暖房往路２３ｂの高温水を追い焚き用補助熱交換器４１に供給する一方、被加熱側の浴槽水との液−液熱交換の後に低温となった低温水を暖房戻路２３ａの途中部位２３５に戻すように配設されている。 The bath reheating circuit 4 is for reheating the bath water in the bathtub C, and the reheating auxiliary heat exchanger 41 that performs liquid-liquid heat exchange using the high-temperature water generated in the heating circuit 2 as a heat source. And a recirculation circuit 42 composed of a slow return path 42a and a rough forward path 42b, and a recirculation circulation pump 43. A heat source supply path 27 for supplying high-temperature water as a heat source from the heating circuit 2 is connected to the heat source side of the auxiliary heat exchanger 41 for reheating, and this heat source supply path 27 is branched from the midway part 233 of the heating forward path 23b for heating. While supplying the high-temperature water in the forward path 23b to the reheating auxiliary heat exchanger 41, the low-temperature water which has become low temperature after the liquid-liquid heat exchange with the bath water on the heated side is supplied to the middle part 235 of the heating return path 23a. It is arranged to return.

そして、追い焚き用循環ポンプ４３の作動により、上流端の接続口４２１に接続された配管及びふろ戻路４２ａを通して浴槽Ｃから浴槽水が追い焚き用補助熱交換器４１の被加熱側に送られ、この追い焚き用補助熱交換器４１において暖房回路２の上記の高温水を熱源とする液−液熱交換により追い焚き加熱され、追い焚き加熱後の浴槽水がふろ往路４２ｂ及びその下流端の接続口４２２に接続された配管を通して浴槽Ｃに送られるようになっている。 Then, the operation of the recirculation circulation pump 43 causes the bath water to be sent from the bathtub C to the heated side of the reheating auxiliary heat exchanger 41 through the pipe connected to the connection port 421 at the upstream end and the bath return path 42a. The reheating auxiliary heat exchanger 41 is reheated by liquid-liquid heat exchange using the high-temperature water in the heating circuit 2 as a heat source, and the reheated bath water is supplied to the forward path 42b and its downstream end. It is sent to the bathtub C through a pipe connected to the connection port 422.

以上、要するに、本実施形態の給湯装置は、循環熱媒である温水を直接に熱交換加熱する燃焼バーナ５２を備えた暖房回路（循環回路）により、給湯回路３の給水が間接加熱されるようになっている。すなわち、第１補助熱交換器３１において暖房回路２の循環熱媒である高温水の供給を受けてその高温水との液−液熱交換による給水の主加熱と、第２補助熱交換器３２において燃焼バーナ５２の燃焼排ガスからの潜熱回収による給水の予熱とが行われるというように、高温水及び燃焼排ガスを介した２種類の熱分配を暖房回路２の側から受けて給湯回路３での給水に対する間接加熱が行われるようになっている。加えて、給湯回路２における間接加熱は、給湯カランＢが開かれると給水路３３からの給水が第１分岐給水路３３ａと第２分岐給水路３３ｂとに分岐されて上記第１補助熱交換器３１と第２補助熱交換器３２とに分配され、それぞれで主加熱又は予熱が並行して行われた後に、その主加熱された湯と予熱された湯とが互いに合流して給湯先である給湯カランＢに給湯されることになる。これにより、給湯回路３において、燃焼バーナ５２等のエネルギー消費を伴う独立した加熱源を必要とせずに他の暖房回路２で用いられる循環熱媒（高温水）を活用した間接加熱によって主加熱を得る一方、その暖房回路２での燃焼バーナ５２の燃焼排ガスからの潜熱回収による予熱をも得ることで熱効率の向上を図ることができる上に、その主加熱のための第１補助熱交換器３１と予熱のための第２補助熱交換器３２とに対し給水を分配して並行に通水させるようにしているため、２つの熱交換器に連続して直列に通水させる場合に比べ給湯回路３の圧力損失を可及的に低減させることができるようになる。 In short, the hot water supply apparatus of the present embodiment is configured so that the water supply of the hot water supply circuit 3 is indirectly heated by the heating circuit (circulation circuit) provided with the combustion burner 52 that directly heat exchange heats the hot water that is the circulating heat medium. It has become. That is, in the first auxiliary heat exchanger 31, the main heating of the feed water by the liquid-liquid heat exchange with the high-temperature water received from the supply of the high-temperature water as the circulating heat medium of the heating circuit 2 and the second auxiliary heat exchanger 32. In the hot water supply circuit 3, two types of heat distribution via the high temperature water and the combustion exhaust gas are received from the side of the heating circuit 2 such that preheating of the water supply by latent heat recovery from the combustion exhaust gas of the combustion burner 52 is performed. Indirect heating for water supply is performed. In addition, indirect heating in the hot water supply circuit 2, when the hot water supply curan B is opened, the water supply from the water supply path 33 is branched into the first branch water supply path 33 a and the second branch water supply path 33 b, and the first auxiliary heat exchanger. 31 and the second auxiliary heat exchanger 32 are respectively heated and preheated in parallel, and then the main heated hot water and the preheated hot water merge with each other to serve as a hot water supply destination. Hot water is supplied to the hot water supply curan B. Thereby, in the hot water supply circuit 3, main heating is performed by indirect heating using a circulating heat medium (high temperature water) used in another heating circuit 2 without requiring an independent heating source with energy consumption such as the combustion burner 52. On the other hand, it is possible to improve the thermal efficiency by obtaining preheating by recovering latent heat from the combustion exhaust gas of the combustion burner 52 in the heating circuit 2, and also the first auxiliary heat exchanger 31 for the main heating. And the second auxiliary heat exchanger 32 for preheating are supplied with water and passed in parallel, so that compared with the case where water is passed in series in succession through the two heat exchangers The pressure loss of 3 can be reduced as much as possible.

＜第２実施形態＞
図２は、本発明の第２実施形態に係る給湯装置を示す。この第２実施形態は第１実施形態の給湯装置に対し通水分配制御手段を付加したものであって、その他の構成要素は第１実施形態のものと同様構成であるため、同一構成要素には同一符号を付してその詳細な説明は省略する。上記の通水分配制御手段とは、給水路３３からの給水の第１補助熱交換器３１及び第２補助熱交換器３２に対する分配比を変更調整するものであり、分配比を変更調整して第１補助熱交換器３１及び第２補助熱交換器３２のそれぞれに通水される給水流量を変更調整可能とするものである。 Second Embodiment
FIG. 2 shows a hot water supply apparatus according to a second embodiment of the present invention. In this second embodiment, water distribution control means is added to the hot water supply apparatus of the first embodiment, and the other components are the same as those in the first embodiment, so the same components are used. Are denoted by the same reference numerals, and detailed description thereof is omitted. The water flow distribution control means is for changing and adjusting the distribution ratio of the water supplied from the water supply channel 33 to the first auxiliary heat exchanger 31 and the second auxiliary heat exchanger 32, and changing and adjusting the distribution ratio. It is possible to change and adjust the flow rate of water supplied to each of the first auxiliary heat exchanger 31 and the second auxiliary heat exchanger 32.

そして、第２実施形態の給湯装置では、通水分配制御手段として流量調整弁３６を給湯接続路３５に介装させている。このような通水分配制御手段が存在しない状態、つまり第１実施形態の状態では、給水路３３の分岐部位３３２において第１分岐給水路３３ａ及び第２分岐給水路３３ｂの双方に対する給水流量の分配比はそれぞれの下流側の流路抵抗の如何に応じて一義的に定められることになる。すなわち、第１分岐給水路３３ａ側での第１補助熱交換器３１の流路抵抗と、第２分岐補助熱交換器３３ｂでの第２補助熱交換器３２の流路抵抗との大小関係によって上記の給水流量の分配比が一義的に定まり、暖房回路２の側の燃焼バーナ５２の燃焼量の大小の如何とは関係なく常に一定の分配比となる。これに対し、第２実施形態の如く流量調整弁３６を介装して通過流量を変更可能とすることによって、例えば全閉にすることで第２補助熱交換器３２への給水の供給を遮断して給水の全てを第１補助熱交換器３１に供給したり、全開にすることで上記の一義的に定まる分配比で給水を分配したり、全閉と全開との間で弁開度を変更することで第１補助熱交換器３１及び第２補助熱交換器３２に対する分配比を変更調整したりすることができるようになる。 And in the hot water supply apparatus of 2nd Embodiment, the flow regulating valve 36 is interposed in the hot water supply connection path 35 as a water flow distribution control means. In a state where there is no such water flow distribution control means, that is, in the state of the first embodiment, distribution of the feed water flow rate to both the first branch water supply channel 33a and the second branch water supply channel 33b in the branch portion 332 of the water supply channel 33. The ratio is uniquely determined according to the flow resistance on the downstream side. That is, depending on the magnitude relationship between the channel resistance of the first auxiliary heat exchanger 31 on the first branch water supply channel 33a side and the channel resistance of the second auxiliary heat exchanger 32 on the second branch auxiliary heat exchanger 33b. The distribution ratio of the feed water flow rate is uniquely determined, and is always a constant distribution ratio regardless of the amount of combustion of the combustion burner 52 on the heating circuit 2 side. On the other hand, the supply of water to the second auxiliary heat exchanger 32 is shut off by, for example, being fully closed by changing the passage flow rate through the flow rate adjustment valve 36 as in the second embodiment. Then, supply all of the water supply to the first auxiliary heat exchanger 31, distribute the supply water at the distribution ratio determined uniquely by opening it fully, or change the valve opening between fully closed and fully open By changing, the distribution ratio with respect to the first auxiliary heat exchanger 31 and the second auxiliary heat exchanger 32 can be changed and adjusted.

上記の流量調整弁３６を次のように作動制御することで、より一層の熱効率の向上を図ることができるようになる。すなわち、暖房回路２の燃焼バーナ５２の燃焼開始から燃焼初期段階の一定期間は流量調整弁３６を全閉又は全閉に近い開度に維持し、燃焼開始からの一定期間経過して燃焼初期段階が終了した後は流量調整弁３６の開度を開側に徐々に拡大させるようにする。燃焼開始からの燃焼初期段階には燃焼排ガスの温度がまだ低い状態にあり第２補助熱交換器３２での潜熱回収が余り期待できないことから、流量調整弁３６を全閉又はほぼ全閉にすることで、給水路３３からの給水のほぼ全量を第１分岐給水路３３ａの側に流して第１補助熱交換器３１に通水させ、これにより、暖房回路２の高温水による液−液熱交換をメインにして熱回収を行うことができる。そして、燃焼初期段階の終了後は燃焼バーナ５２の燃焼状態も安定して燃焼排ガスからの潜熱回収も十分に行い得る段階になれば、流量調整弁３６の開度を徐々に拡大していくことで、第２補助熱交換器３２の側への給水流量の分配を増大させて第２補助熱交換器３２での潜熱回収を増大させることができるようになる。以上により、潜熱回収があまり期待し得ない燃焼初期段階であっても定常燃焼段階と同じ分配比で固定的に第２補助熱交換器３２に対し給水を流し続ける場合と比べ、熱効率を向上させることができるようになる。又、給湯回路３の側での熱回収の観点から見ると、一定の給湯温度まで昇温させるための燃料量(燃焼バーナ５２での使用ガス量)を相対的に少なくすることができるようにもなる。 By controlling the operation of the flow rate adjusting valve 36 as follows, the thermal efficiency can be further improved. That is, the flow rate adjusting valve 36 is maintained at an opening degree close to or close to the full opening for a certain period from the start of combustion of the combustion burner 52 of the heating circuit 2, and after a certain period from the start of combustion, the initial stage of combustion. After the operation is completed, the opening degree of the flow rate adjustment valve 36 is gradually increased to the open side. Since the temperature of the combustion exhaust gas is still low at the initial stage of combustion from the start of combustion and the latent heat recovery in the second auxiliary heat exchanger 32 cannot be expected so much, the flow rate adjustment valve 36 is fully closed or almost fully closed. As a result, almost the entire amount of water supplied from the water supply channel 33 flows to the first branch water supply channel 33a and is passed through the first auxiliary heat exchanger 31, whereby the liquid-liquid heat generated by the high-temperature water in the heating circuit 2 is obtained. Heat recovery can be performed mainly through replacement. When the combustion state of the combustion burner 52 is stable and the latent heat recovery from the combustion exhaust gas can be sufficiently performed after the completion of the initial combustion stage, the opening degree of the flow rate adjusting valve 36 is gradually increased. Thus, the distribution of the feed water flow rate to the second auxiliary heat exchanger 32 side can be increased, and the latent heat recovery in the second auxiliary heat exchanger 32 can be increased. As described above, the thermal efficiency is improved compared with the case where the feed water is continuously supplied to the second auxiliary heat exchanger 32 at the same distribution ratio as that in the steady combustion stage even in the early combustion stage where latent heat recovery cannot be expected so much. Will be able to. Further, from the viewpoint of heat recovery on the hot water supply circuit 3 side, the amount of fuel for raising the temperature to a constant hot water supply temperature (the amount of gas used in the combustion burner 52) can be relatively reduced. Also become.

以上は通水分配制御手段として流量調整弁３６を第２補助熱交換器３２の側(給湯接続路３５)に介装した例について説明したが、第１補助熱交換器３１の側(第１分岐給水路３３ａ)にも別の流量調整弁３７を介装させ、これら一対の流量調整弁３６，３７で通水分配制御手段を構成するようにしてもよい。さらに、これらに代えて給水路３３の分岐部位３３２に対し通水分配機構３８を介装し、この通水分配機構３８により通水分配制御手段を構成するようにしてもよい。この通水分配機構３８としては、入口に給水路３３の下流端を接続し、２方向に分岐した一方の出口側に第２分岐給水路３３ｂの上流端を、他方の出口側に第１分岐給水路３３ａの上流端をそれぞれ接続し、少なくとも上記一方の出口側の通路に弁開度が可変の弁を内蔵させるように構成すればよい。 In the above, an example in which the flow rate adjusting valve 36 is interposed on the second auxiliary heat exchanger 32 side (hot water supply connection path 35) as the water distribution control means has been described. However, the first auxiliary heat exchanger 31 side (first Another flow rate adjusting valve 37 may also be interposed in the branch water supply path 33a), and the pair of flow rate adjusting valves 36, 37 may constitute a water flow distribution control means. Further, instead of these, a water distribution / distribution mechanism 38 may be interposed in the branch portion 332 of the water supply passage 33, and the water distribution / distribution mechanism 38 may constitute the water distribution / distribution control means. As this water distribution mechanism 38, the downstream end of the water supply channel 33 is connected to the inlet, the upstream end of the second branch water supply channel 33b is connected to one outlet side branched in two directions, and the first branch is connected to the other outlet side. What is necessary is just to comprise so that the upstream end of the water supply path 33a may be connected, respectively, and the valve with a variable valve opening may be incorporated in at least one of the outlet-side passages.

又、給水路３３に介装した給水温度センサ６１からの給水温度と、第１補助熱交換器３１の出口側の出口温度センサ６２からの主加熱温度と、第２補助熱交換器３２の出口側の出口温度センサ６３からの予熱温度と、合流後の給湯路３４に介装した給湯温度センサ６４からの給湯温度とに基づいて、所定の給湯温度を得る上で燃焼バーナ５２による燃焼量(使用ガス量)が最も少なくなるような分配比を演算により求め、この演算された分配比になるように上記の通水分配制御手段（流量調整弁３６、流量調整弁３６，３７、又は、通水分配機構３８）の作動制御を行うようにしてもよい。 Further, the feed water temperature from the feed water temperature sensor 61 interposed in the feed water path 33, the main heating temperature from the outlet temperature sensor 62 on the outlet side of the first auxiliary heat exchanger 31, and the outlet of the second auxiliary heat exchanger 32. The amount of combustion by the combustion burner 52 to obtain a predetermined hot water temperature based on the preheating temperature from the outlet temperature sensor 63 on the side and the hot water temperature from the hot water temperature sensor 64 interposed in the hot water supply passage 34 after joining ( The distribution ratio that minimizes the amount of gas used) is obtained by calculation, and the above water distribution control means (flow rate adjustment valve 36, flow rate adjustment valves 36, 37, or flow rate is adjusted so that the calculated distribution ratio is obtained. Operation control of the water distribution mechanism 38) may be performed.

＜他の実施形態＞
なお、本発明は上記第１及び第２実施形態に限定されるものではなく、その他種々の実施形態を包含するものである。すなわち、上記第１又は第２実施形態の給湯装置では、循環回路としての暖房回路２と、給湯回路３と、ふろ追い焚き回路４とを備えた複合熱源機を示したが、これに限らず、ふろ追い焚き回路４を省略して暖房回路２と給湯回路３との組み合わせで構成してもよいし、あるいは、暖房回路２以外の循環回路と給湯回路３との組み合わせで構成してもよい。 <Other embodiments>
The present invention is not limited to the first and second embodiments described above, but includes other various embodiments. That is, in the hot water supply apparatus of the first or second embodiment, the composite heat source apparatus including the heating circuit 2 as a circulation circuit, the hot water supply circuit 3, and the bath reheating circuit 4 is shown. The bathing circuit 4 may be omitted and the heating circuit 2 and the hot water supply circuit 3 may be combined, or the circulation circuit other than the heating circuit 2 and the hot water supply circuit 3 may be combined. .

本発明の第１実施形態を示す模式図である。It is a mimetic diagram showing a 1st embodiment of the present invention. 本発明の第２実施形態を示す、図１対応の模式図である。It is a schematic diagram corresponding to FIG. 1, showing a second embodiment of the present invention. 本発明の解決すべき課題を説明するために対比される給湯装置を示す図１対応図である。FIG. 2 is a view corresponding to FIG. 1 showing a hot water supply apparatus to be compared in order to explain a problem to be solved by the present invention.

Explanation of symbols

２暖房回路（循環回路）
３給湯回路
２１主熱交換器
３１第１補助熱交換器
３２第２補助熱交換器
３３給水路
３３ａ第１分岐給水路
３３ｂ第２分岐給水路
３４給湯路
３５給湯接続路（給湯路）
３６，３７流量調整弁（通水分配制御手段）
３８通水分配機構（通水分配制御手段）
５２燃焼バーナ
３３２分岐部位
３４１合流部位 2 Heating circuit (circulation circuit)
3 Hot-water supply circuit 21 Main heat exchanger 31 1st auxiliary heat exchanger 32 2nd auxiliary heat exchanger 33 Water supply path 33a First branch water supply path 33b Second branch water supply path 34 Hot water supply path 35 Hot water supply connection path (hot water supply path)
36, 37 Flow control valve (water distribution control means)
38 Water distribution mechanism (Water distribution control means)
52 Combustion burner 332 Branching part 341 Joining part

Claims

The circulating heat medium comprises a circulation circuit in which heat is heated by the combustion heat of the combustion burner in the main heat exchanger, and a hot water supply circuit that is indirectly heated by receiving heat distribution from the circulation circuit. A first auxiliary heat exchanger that heats the feed water using the circulating heat medium in the circulation circuit as a heat source, and a second auxiliary heat exchanger that recovers latent heat from the combustion exhaust gas of the combustion burner and preheats the feed water A hot water supply apparatus comprising a hot water supply path,
The water supply channel is arranged to branch into a first branch water supply channel connected to the inlet of the first auxiliary heat exchanger and a second branch water supply channel connected to the inlet of the second auxiliary heat exchanger. Established,
The hot water supply apparatus is characterized in that the hot water supply passage is arranged to join the outlet of the first auxiliary heat exchanger and the outlet of the second auxiliary heat exchanger.

The circulating heat medium comprises a circulation circuit in which heat is heated by the combustion heat of the combustion burner in the main heat exchanger, and a hot water supply circuit that is indirectly heated by receiving heat distribution from the circulation circuit. A first auxiliary heat exchanger that heats the feed water using the circulating heat medium in the circulation circuit as a heat source, and a second auxiliary heat exchanger that recovers latent heat from the combustion exhaust gas of the combustion burner and preheats the feed water A hot water supply apparatus comprising a hot water supply path,
The water supply channel is arranged to branch into a first branch water supply channel connected to the inlet of the first auxiliary heat exchanger and a second branch water supply channel connected to the inlet of the second auxiliary heat exchanger. Established,
The hot water supply path is arranged to join the outlet of the first auxiliary heat exchanger and the outlet of the second auxiliary heat exchanger,
Water flow distribution control for changing and adjusting the distribution ratio of the water supplied from the water supply passage to the first auxiliary heat exchanger and the second auxiliary heat exchanger between the branch portion of the water supply passage and the joining portion of the hot water supply passage. A hot water supply apparatus, characterized in that means are provided.