JP2020008217A - Water heater with instantaneous hot water function - Google Patents

Water heater with instantaneous hot water function Download PDF

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JP2020008217A
JP2020008217A JP2018129368A JP2018129368A JP2020008217A JP 2020008217 A JP2020008217 A JP 2020008217A JP 2018129368 A JP2018129368 A JP 2018129368A JP 2018129368 A JP2018129368 A JP 2018129368A JP 2020008217 A JP2020008217 A JP 2020008217A
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pipe
hot water
water supply
heat exchanger
check valve
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JP7117765B2 (en
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友助 柿崎
Yusuke Kakizaki
友助 柿崎
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Paloma Co Ltd
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]

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Abstract

To prevent lowering of a hot water tapping temperature caused by a backflow of water in an external pipeline, and to easily execute air-bleeding and drainage even when a non-self-priming type is used as a circulation pump.SOLUTION: A water heater 1 with instantaneous hot water function includes: a burner unit 6 and a heat exchanger 7; a water supply pipe 19 connected to the heat exchanger 7; a hot water tapping pipe 20 connected to the heat exchanger 7; and a return pipe 21 connected to the water supply pipe 19, and having a circulation pump 22. A check valve 29 is provided on the downstream side of the circulation pump 22 in the return pipe 21, and between the circulation pump 22 and the check valve 29 in the return pipe 21, a branch pipe 27 which can be opened to the outside of the fixture is connected.SELECTED DRAWING: Figure 6

Description

本発明は、外部配管と器具内の配管との間で湯水を循環させて熱交換器で加熱することで保温し、外部配管の給湯栓から即時給湯可能とした即湯機能付給湯器に関する。   TECHNICAL FIELD The present invention relates to a hot water supply device with a hot water function that circulates hot water between an external pipe and a pipe in an appliance and heats the hot water with a heat exchanger so that the hot water can be supplied immediately from a hot water tap of the external pipe.

給湯器には、熱交換器に接続される給水管に、循環ポンプを備えた戻り管を接続して即湯機能を備えたものが知られている（例えば特許文献１参照）。この即湯機能付給湯器では、出湯管と戻り管との間を外部配管で接続することで、出湯管と外部配管と戻り管と給水管とで循環経路を形成し、この循環経路に循環ポンプで湯水を循環させながら熱交換器で加熱することで保温運転が可能となる。よって、外部配管に設けた給湯栓を開栓すると、即時給湯が可能となる。   2. Description of the Related Art There is known a water heater having a hot water function by connecting a return pipe equipped with a circulation pump to a water supply pipe connected to a heat exchanger (for example, see Patent Document 1). In this hot water supply device with a hot water function, a circulation path is formed between the tapping pipe, the external pipe, the return pipe, and the water supply pipe by connecting the tapping pipe and the return pipe with an external pipe, and the circulation path is circulated through the circulation path. Heating operation is possible by heating with a heat exchanger while circulating hot and cold water with a pump. Therefore, when the hot water tap provided on the external pipe is opened, hot water can be immediately supplied.

特開２００４−２８６３９７号公報JP-A-2004-286397

この即湯機能付給湯器では、熱交換器の伝熱管での圧力損失が大きいため、給水管内の水が戻り管内を逆流して外部配管へ流れるおそれがあり、この場合、給湯栓から設定温度よりも低い温度で出湯されてしまう。
一方、ポンプは、自吸能力の有無によって自吸タイプと非自吸タイプとに分けられるが、非自吸タイプのポンプの方が自吸タイプよりも耐圧性及び最高使用流体温度が高いため、即湯機能付給湯器の循環ポンプとしては非自吸タイプが適している。
しかし、非自吸タイプのポンプは、吸い込み側を含むポンプ全体を呼び水で満たす必要がある上、空気分離室がないため、施工時にはエア抜きを行う必要がある。また、冬季に長期使用しない場合は、水抜きを行わないと凍結するおそれが生じる。 In this hot water supply with hot water function, since the pressure loss in the heat transfer pipe of the heat exchanger is large, water in the water supply pipe may flow backward in the return pipe and flow to the external pipe. Hot water is discharged at a lower temperature.
On the other hand, pumps are classified into a self-priming type and a non-self-priming type depending on the presence or absence of self-priming ability.However, the non-self-priming type pump has higher pressure resistance and maximum working fluid temperature than the self-priming type pump, A non-self-priming type is suitable as a circulating pump for a hot-water supply water heater.
However, the non-self-priming type pump needs to fill the entire pump including the suction side with priming water, and since there is no air separation chamber, it is necessary to bleed air during construction. In addition, if it is not used for a long time in winter, it may freeze if water is not drained.

そこで、本発明は、外部配管への水の逆流による出湯温度の低下を防止すると共に、循環ポンプとして非自吸タイプを使用してもエア抜きや水抜きを容易に実施でき、施工や凍結予防が簡単に行える即湯機能付給湯器を提供すること目的としたものである。   Therefore, the present invention prevents the drop of tap water temperature due to the backflow of water to the external piping, and can easily perform air bleeding and water bleeding even if a non-self-priming type is used as a circulating pump, thereby preventing construction and freezing. It is an object of the present invention to provide a hot water supply device with an instant hot water function that can easily perform a hot water supply.

上記目的を達成するために、請求項１に記載の発明は、バーナ及び熱交換器と、熱交換器に接続される給水管と、熱交換器に接続される出湯管と、給水管に接続され、循環ポンプを備えた戻り管と、を備え、出湯管と戻り管とを外部配管で接続することで、出湯管から出湯される湯水が外部配管を介して戻り管に戻り、給水管から熱交換器に至る循環経路が形成される即湯機能付給湯器であって、
戻り管における循環ポンプの下流側に逆止弁が設けられると共に、戻り管における循環ポンプと逆止弁との間に、器具外へ開放可能な分岐管が接続されていることを特徴とする。
請求項２に記載の発明は、請求項１の構成において、分岐管は、戻り管を形成する一部の配管と一体に形成されていることを特徴とする。
請求項３に記載の発明は、請求項２の構成において、逆止弁は、当該一部の配管内に設けられていることを特徴とする。 Means for Solving the Problems To achieve the above object, an invention according to claim 1 includes a burner and a heat exchanger, a water supply pipe connected to the heat exchanger, a hot water pipe connected to the heat exchanger, and a water supply pipe connected to the water supply pipe. And a return pipe provided with a circulation pump, and by connecting the tapping pipe and the return pipe with an external pipe, hot water discharged from the tapping pipe returns to the return pipe via the external pipe, and from the water supply pipe. A water heater with a hot water function in which a circulation path leading to the heat exchanger is formed,
A check valve is provided downstream of the circulation pump in the return pipe, and a branch pipe openable to the outside of the device is connected between the circulation pump and the check valve in the return pipe.
According to a second aspect of the present invention, in the configuration of the first aspect, the branch pipe is formed integrally with a part of the pipe forming the return pipe.
According to a third aspect of the present invention, in the configuration of the second aspect, the check valve is provided in a part of the piping.

請求項１に記載の発明によれば、戻り管における循環ポンプの下流側に逆止弁が設けられると共に、戻り管における循環ポンプと逆止弁との間に、器具外へ開放可能な分岐管が接続されているので、逆止弁によって外部配管への水の逆流による出湯温度の低下を防止できると共に、循環ポンプとして非自吸タイプを使用しても分岐管によってエア抜きや水抜きを容易に実施でき、施工や凍結予防が簡単に行える。
請求項２に記載の発明によれば、請求項１の効果に加えて、分岐管は、戻り管を形成する一部の配管と一体に形成されているので、戻り管へ分岐管を簡単に設けることができる。
請求項３に記載の発明によれば、請求項２の効果に加えて、逆止弁も横管内に設けられているので、分岐管と逆止弁とを含めたユニットとして簡単に設置できる。 According to the first aspect of the present invention, the check valve is provided in the return pipe on the downstream side of the circulation pump, and the branch pipe can be opened to the outside of the device between the circulation pump and the check valve in the return pipe. The check valve prevents a drop in tapping temperature due to backflow of water to the external piping by the check valve, and facilitates air bleeding and draining by the branch pipe even if a non-self-priming type circulating pump is used. Construction and freezing prevention can be easily performed.
According to the second aspect of the invention, in addition to the effect of the first aspect, since the branch pipe is formed integrally with a part of the pipe forming the return pipe, the branch pipe can be easily connected to the return pipe. Can be provided.
According to the third aspect of the invention, in addition to the effect of the second aspect, since the check valve is also provided in the horizontal pipe, it can be easily installed as a unit including the branch pipe and the check valve.

給湯器の正面図である。It is a front view of a water heater. 給湯器の底面図である。It is a bottom view of a water heater. フロントカバーを外した状態の正面図である。It is a front view in the state where the front cover was removed. 戻り管を正面から見た筐体下部の拡大図である。It is the enlarged view of the housing lower part which looked at the return pipe from the front. 戻り管における逆止弁部分の断面図である。It is sectional drawing of the check valve part in a return pipe. 即湯システムの概略図である。It is the schematic of a hot water system.

以下、本発明の実施の形態を図面に基づいて説明する。
図１は、即湯機能付給湯器（以下単に「給湯器」という。）の一例を示す正面図、図２は底面図である。この給湯器１は、前面を除く５面を閉塞した箱本体３と、箱本体３の前面を閉塞するフロントカバー４とからなる筐体２を有する。筐体２内には、フロントカバー４を外した状態の図３に示すように、下方からバーナユニット６、熱交換器７、排気フード８を備えた燃焼装置５が設置されて、排気フード８の上端に設けた排気筒９が、箱本体３の上板を貫通して上方へ突出している。箱本体３の背面上下には、屋内の壁等に設置するための取付金具１０，１０が設けられ、箱本体３の背板には、複数の給気口１１，１１・・が形成されている。
箱本体３の底面には、外部のガス配管が接続される管状のガス接続口１２と、外部の給水配管が接続される管状の給水接続口１３と、外部の給湯配管が接続される管状の給湯接続口１４及び管状の戻り接続口１５とが設けられている。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a front view showing an example of a hot water heater with a hot water function (hereinafter simply referred to as “hot water heater”), and FIG. 2 is a bottom view. The water heater 1 has a housing 2 including a box body 3 having five closed surfaces except the front surface, and a front cover 4 having a closed front surface of the box body 3. As shown in FIG. 3 with the front cover 4 removed, a combustion device 5 including a burner unit 6, a heat exchanger 7, and an exhaust hood 8 is installed in the housing 2 from below. An exhaust pipe 9 provided at the upper end of the box main body 3 projects upward through the upper plate of the box body 3. At the top and bottom of the back of the box body 3, mounting brackets 10, 10 for installation on an indoor wall or the like are provided, and a plurality of air supply ports 11, 11,. I have.
At the bottom of the box body 3, a tubular gas connection port 12 to which an external gas pipe is connected, a tubular water supply port 13 to which an external water supply pipe is connected, and a tubular gas connection to which an external hot water supply pipe is connected. A hot water supply connection port 14 and a tubular return connection port 15 are provided.

バーナユニット６は、内部に図示しない複数のバーナを備え、ここにはガス接続口１２と接続されてバーナへ燃料ガスを供給し、図示しない元弁や比例制御弁等を備えたガス管１６が接続されると共に、バーナへ燃焼用空気を供給するためのファン１７が設けられている。
熱交換器７は、図示しない複数のフィンを蛇行状に貫通する伝熱管１８を有し、伝熱管１８の入側端部には、給水接続口１３と接続される給水管１９が接続され、伝熱管１８の出側端部には、給湯接続口１４と接続される出湯管２０が接続されている。 The burner unit 6 includes a plurality of burners (not shown) therein. The burner unit 6 is connected to a gas connection port 12 to supply fuel gas to the burners, and includes a gas pipe 16 having a base valve and a proportional control valve (not shown). A fan 17 for connection and supplying combustion air to the burner is provided.
The heat exchanger 7 has a heat transfer tube 18 that penetrates a plurality of fins (not shown) in a meandering shape, and a water supply tube 19 connected to the water supply connection port 13 is connected to an input end of the heat transfer tube 18. A tapping pipe 20 connected to the hot water supply connection port 14 is connected to an outlet end of the heat transfer pipe 18.

そして、戻り接続口１５と給水管１９との間には、戻り管２１が接続されている。この戻り管２１は、図４にも示すように、管状の戻り接続口１５と、戻り接続口１５に下向きの吸込管２２ａが接続される非自吸タイプの循環ポンプ２２と、循環ポンプ２２の横向きの吐出管２２ｂに上流端が接続される横管２３と、横管２３の下流端に接続され、給水管１９の一部を形成する中継管２４から横向きに分岐形成された分岐管部２５とからなる。各管の端部同士をクリップ２６，２６・・で接続することで、戻り接続口１５から中継管２４に繋がる戻り管２１が形成される。中継管２４の上下端もクリップ２６でそれぞれ接続される。   A return pipe 21 is connected between the return connection port 15 and the water supply pipe 19. As shown in FIG. 4, the return pipe 21 includes a tubular return connection port 15, a non-self-priming circulating pump 22 in which a downward suction pipe 22 a is connected to the return connection port 15, and a circulating pump 22. A horizontal pipe 23 having an upstream end connected to the horizontal discharge pipe 22b; and a branch pipe section 25 connected to the downstream end of the horizontal pipe 23 and branching laterally from a relay pipe 24 forming a part of the water supply pipe 19. Consists of By connecting the ends of the pipes with the clips 26, 26,..., A return pipe 21 connected from the return connection port 15 to the relay pipe 24 is formed. The upper and lower ends of the relay tube 24 are also connected by clips 26, respectively.

また、横管２３には、下向きの分岐管２７が設けられている。この分岐管２７は、箱本体３の底板に下端が接続されて下端を外部に開口させており、当該下端には、下方からプラグ２８がねじ込み固定されて、任意に下端を開放可能となっている。
さらに、横管２３の下流端には、図５に示すように、逆止弁２９が設けられて、給水管１９から循環ポンプ２２側への水の逆流を防止している。
ここでの横管２３と分岐管２７とは一体形成されて、横管２３に逆止弁２９を組み込んだＴ字状のユニットとなっているため、器具内への取り付け及び取り外しが容易に行える。特に、中継管２４も給水管１９の一部として別体で取り付けられるので、循環ポンプ２２とＴ字状の管体（逆止弁２９付の横管２３及び分岐管２７）と中継管２４とを循環路形成ユニットＵとして既存の給湯器に組み込むことで即湯機能を簡単に付与できる。 The horizontal pipe 23 is provided with a downward branch pipe 27. The branch pipe 27 has a lower end connected to the bottom plate of the box body 3 and has a lower end opened to the outside. A plug 28 is screwed and fixed to the lower end from below so that the lower end can be arbitrarily opened. I have.
Further, as shown in FIG. 5, a check valve 29 is provided at the downstream end of the horizontal pipe 23 to prevent the water from flowing backward from the water supply pipe 19 to the circulation pump 22 side.
Here, the horizontal pipe 23 and the branch pipe 27 are integrally formed to form a T-shaped unit in which a check valve 29 is incorporated in the horizontal pipe 23, so that the horizontal pipe 23 and the branch pipe 27 can be easily installed and removed in the instrument. . In particular, since the relay pipe 24 is also attached separately as a part of the water supply pipe 19, the circulation pump 22, the T-shaped pipe (the horizontal pipe 23 with the check valve 29 and the branch pipe 27), the relay pipe 24 and Can be easily added to the existing water heater as a circulation path forming unit U.

図６は、給湯器１を用いた即湯システム４０の概略を示すもので、循環経路に係る構成以外は省略している。３０は、給水管１９と出湯管２０との間を接続して熱交換器７をバイパスするバイパス管である。
この即湯システム４０は、給湯接続口１４と戻り接続口１５との間に、複数の給湯栓４２，４２・・を備えた外部配管４１を接続することで構築される。これにより、出湯管２０から出湯される湯水が、外部配管４１を通って戻り管２１に戻り、給水管１９を介して熱交換器７に戻る循環経路が形成される。よって、循環ポンプ２２の運転により循環経路内で湯水を循環させながらバーナユニット６でバーナを燃焼させることで、器具内に設けた図示しないコントローラで設定された設定温度での保温運転が可能となる。すなわち、給湯栓４２の何れかを開栓することで即時給湯が可能となっている。 FIG. 6 schematically shows a hot water system 40 using the water heater 1, and omits components other than those relating to the circulation path. Reference numeral 30 denotes a bypass pipe that connects between the water supply pipe 19 and the tapping pipe 20 and bypasses the heat exchanger 7.
The hot water system 40 is constructed by connecting an external pipe 41 having a plurality of hot water taps 42 between the hot water supply connection port 14 and the return connection port 15. Thus, a circulation path is formed in which the hot water discharged from the tapping pipe 20 returns to the return pipe 21 through the external pipe 41 and returns to the heat exchanger 7 via the water supply pipe 19. Therefore, by burning the burner with the burner unit 6 while circulating hot water in the circulation path by the operation of the circulation pump 22, it is possible to perform a heat retention operation at a set temperature set by a controller (not shown) provided in the appliance. . That is, hot water can be supplied immediately by opening any of the hot water taps 42.

以上の如く構成された給湯器１においては、施工時には、非自吸タイプである循環ポンプ２２に対してエア抜きを行う必要があるため、プラグ２８を緩めるか取り外すかした状態で循環ポンプ２２を駆動させて水を循環させる試運転を行う。すると、配管内の空気が循環経路を流れる水によって押し出されて外部配管４１から戻り管２１に至り、循環ポンプ２２を通って分岐管２７から排出される。よって、エア抜きを容易に行うことができる。このとき分岐管２７の下流側の逆止弁２９には給水管１９からの水圧が加わるので、配管内の空気の殆どは逆止弁２９を通過することなく分岐管２７から排出される。
また、冬季に長期使用しない場合も、プラグ２８を緩めるか取り外すかすれば、循環ポンプ２２及び戻り管２１からの水抜きを分岐管２７を介して容易に行うことできる。
一方、即湯システム４０に組み込んで保温運転を行う際、熱交換器７の伝熱管１８での圧力損失が大きくなっても、戻り管２１には逆止弁２９が設けられているため、給水管１９内の水が戻り管２１内を逆流して外部配管４１へ流れるおそれがない。 In the water heater 1 configured as described above, it is necessary to bleed air from the non-self-priming circulating pump 22 at the time of construction, and thus the circulating pump 22 is detached with the plug 28 loosened or removed. Perform a test run to drive and circulate water. Then, the air in the pipe is pushed out by the water flowing through the circulation path, reaches the return pipe 21 from the external pipe 41, and is discharged from the branch pipe 27 through the circulation pump 22. Therefore, air can be easily removed. At this time, since the water pressure from the water supply pipe 19 is applied to the check valve 29 on the downstream side of the branch pipe 27, most of the air in the pipe is discharged from the branch pipe 27 without passing through the check valve 29.
In addition, even when the plug 28 is not used for a long time in winter, if the plug 28 is loosened or removed, the drainage from the circulation pump 22 and the return pipe 21 can be easily performed via the branch pipe 27.
On the other hand, when the heat retaining operation is performed by incorporating it into the hot water system 40, even if the pressure loss in the heat transfer tube 18 of the heat exchanger 7 increases, the return pipe 21 is provided with the check valve 29. There is no possibility that the water in the pipe 19 flows backward in the return pipe 21 and flows to the external pipe 41.

このように、上記形態の給湯器１によれば、戻り管２１における循環ポンプ２２の下流側に逆止弁２９が設けられると共に、戻り管２１における循環ポンプ２２と逆止弁２９との間に、器具外へ開放可能な分岐管２７が接続されているので、逆止弁２９によって外部配管４１への水の逆流による出湯温度の低下を防止できると共に、循環ポンプ２２として非自吸タイプを使用しても分岐管２７によってエア抜きや水抜きを容易に実施でき、施工や凍結予防が簡単に行える。
特にここでは、分岐管２７は、戻り管２１を形成する一部の配管（横管２３）と一体に形成されているので、戻り管２１へ分岐管２７を簡単に設けることができる。
また、逆止弁２９も横管２３内に設けられているので、分岐管２７と逆止弁２９とを含めたユニットとして簡単に設置できる。 As described above, according to the water heater 1 of the above-described embodiment, the check valve 29 is provided on the return pipe 21 on the downstream side of the circulation pump 22, and between the circulation pump 22 and the check valve 29 on the return pipe 21. Since the branch pipe 27 which can be opened to the outside of the appliance is connected, the check valve 29 can prevent a drop in tap water temperature due to the backflow of water to the external pipe 41, and use a non-self-priming type as the circulation pump 22. Even so, air bleeding and water bleeding can be easily performed by the branch pipe 27, and construction and freezing prevention can be easily performed.
Particularly, here, the branch pipe 27 is formed integrally with a part of the pipe (the horizontal pipe 23) forming the return pipe 21, so that the branch pipe 27 can be easily provided on the return pipe 21.
Further, since the check valve 29 is also provided in the horizontal pipe 23, it can be easily installed as a unit including the branch pipe 27 and the check valve 29.

なお、上記形態では、逆止弁を横管に設けているが、中継管の分岐管部に設けてもよい。
また、戻り管を、戻り接続口と循環ポンプと横管と中継管の分岐管部とに分割して、分岐管を横管へ一体に設けているが、これに限らず、例えば横管と分岐管部とを一体に設けたり、横管と分岐管とを別体として接続したり等、分割形態は適宜変更可能である。
さらに、戻り管以外の給湯器の構成も上記形態に限らず、副熱交換器を備えた潜熱回収型や、給湯側と風呂側或いは暖房側との加熱回路を有する複合型等であっても、本発明は適用可能である。 In the above embodiment, the check valve is provided on the horizontal pipe, but may be provided on the branch pipe of the relay pipe.
Further, the return pipe is divided into a return connection port, a circulation pump, a horizontal pipe, and a branch pipe portion of a relay pipe, and the branch pipe is provided integrally with the horizontal pipe. However, the present invention is not limited to this. The division form can be changed as appropriate, such as integrally providing the branch pipe part or connecting the horizontal pipe and the branch pipe separately.
Further, the configuration of the water heater other than the return pipe is not limited to the above-described embodiment, and may be a latent heat recovery type having a sub heat exchanger, a composite type having a heating circuit for a hot water supply side and a bath side or a heating side, or the like. The present invention is applicable.

１・・即湯機能付給湯器、２・・筐体、３・・箱本体、４・・フロントカバー、５・・燃焼装置、６・・バーナユニット、７・・熱交換器、８・・排気フード、９・・排気筒、１２・・ガス接続口、１３・・給水接続口、１４・・給湯接続口、１５・・戻り接続口、１６・・ガス管、１９・・給水管、２０・・出湯管、２１・・戻り管、２２・・循環ポンプ、２３・・横管、２４・・中継管、２７・・分岐管、２８・・プラグ、２９・・逆止弁、４０・・即湯システム、４１・・外部配管、４２・・給湯栓。   1. Hot water supply with hot water function, 2. Housing, 3. Box body, 4. Front cover, 5. Combustion device, 6. Burner unit, 7. Heat exchanger, 8. Exhaust hood, 9 exhaust pipe, 12 gas connection port, 13 water supply connection port, 14 hot water connection port, 15 return port, 16 gas pipe, 19 water pipe, 20 .. tapping pipe, 21. return pipe, 22 .. circulation pump, 23 .. horizontal pipe, 24 .. relay pipe, 27 .. branch pipe, 28 .. plug, 29 .. check valve, 40 .. Hot water system, 41 ... external piping, 42 ... hot water tap.

Claims (3)

バーナ及び熱交換器と、
前記熱交換器に接続される給水管と、
前記熱交換器に接続される出湯管と、
前記給水管に接続され、循環ポンプを備えた戻り管と、を備え、
前記出湯管と前記戻り管とを外部配管で接続することで、前記出湯管から出湯される湯水が前記外部配管を介して前記戻り管に戻り、前記給水管から前記熱交換器に至る循環経路が形成される即湯機能付給湯器であって、
前記戻り管における前記循環ポンプの下流側に逆止弁が設けられると共に、
前記戻り管における前記循環ポンプと前記逆止弁との間に、器具外へ開放可能な分岐管が接続されていることを特徴とする即湯機能付給湯器。 A burner and a heat exchanger;
A water supply pipe connected to the heat exchanger,
Tapping pipe connected to the heat exchanger,
A return pipe connected to the water supply pipe and provided with a circulation pump,
By connecting the tapping pipe and the return pipe with an external pipe, hot water discharged from the tapping pipe returns to the return pipe via the external pipe, and a circulation path from the water supply pipe to the heat exchanger. A hot water supply with a hot water function, wherein
A check valve is provided downstream of the circulation pump in the return pipe,
A hot water supply device with a hot water function, wherein a branch pipe that can be opened to the outside of the appliance is connected between the circulation pump and the check valve in the return pipe. 前記分岐管は、前記戻り管を形成する一部の配管と一体に形成されていることを特徴とする請求項１に記載の即湯機能付給湯器。   2. The hot water supply device with a hot water function according to claim 1, wherein the branch pipe is formed integrally with a part of the pipe forming the return pipe. 3. 前記逆止弁は、前記一部の配管内に設けられていることを特徴とする請求項２に記載の即湯機能付給湯器。   The hot water supply device with a hot water function according to claim 2, wherein the check valve is provided in the partial pipe.
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004125228A (en) * 2002-09-30 2004-04-22 Sekisui Chem Co Ltd Water heater
JP2004286397A (en) * 2003-03-25 2004-10-14 Rinnai Corp Hot-water supply device with instantaneous hot-water supply function
JP2013015263A (en) * 2011-07-04 2013-01-24 Tokyo Gas Co Ltd Hot water supply system
JP2013152039A (en) * 2012-01-25 2013-08-08 Noritz Corp Connection type water heater system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2004125228A (en) * 2002-09-30 2004-04-22 Sekisui Chem Co Ltd Water heater
JP2004286397A (en) * 2003-03-25 2004-10-14 Rinnai Corp Hot-water supply device with instantaneous hot-water supply function
JP2013015263A (en) * 2011-07-04 2013-01-24 Tokyo Gas Co Ltd Hot water supply system
JP2013152039A (en) * 2012-01-25 2013-08-08 Noritz Corp Connection type water heater system

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