JP2017122533A - Bath water heater - Google Patents
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- JP2017122533A JP2017122533A JP2016001364A JP2016001364A JP2017122533A JP 2017122533 A JP2017122533 A JP 2017122533A JP 2016001364 A JP2016001364 A JP 2016001364A JP 2016001364 A JP2016001364 A JP 2016001364A JP 2017122533 A JP2017122533 A JP 2017122533A
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Abstract
Description
本発明は、給湯用のバーナと風呂追い焚き用のバーナに供給するガス量を共通の比例弁で制御する風呂給湯器に関する。 The present invention relates to a bath water heater that controls the amount of gas supplied to a hot water supply burner and a bath reheating burner with a common proportional valve.
風呂給湯器においては、燃焼ガスの供給量を調整するためのガス比例弁を給湯用バーナと風呂追い焚き用バーナに個別に設けることはコスト削減等の要請から行われず、通常、これらに対して共通のガス比例弁が設けられる。そして、給湯運転と風呂追い焚き運転が同時に行われて、給湯用バーナと風呂追い焚き用バーナを同時燃焼させるときは、給湯温度が目標温度になるように、給湯用バーナの燃焼量を優先してガス比例弁の開度が制御される。 In bath water heaters, the provision of gas proportional valves for adjusting the supply of combustion gas separately to the hot water supply burner and the bath reheating burner is not performed due to demands for cost reduction, etc. A common gas proportional valve is provided. When the hot water supply operation and the bath reheating operation are performed at the same time and the hot water supply burner and the bath reheating burner are simultaneously burned, the combustion amount of the hot water supply burner is given priority so that the hot water supply temperature becomes the target temperature. Thus, the opening degree of the gas proportional valve is controlled.
給湯側優先により、同時燃焼時のガス比例弁の開度が小さく、かつ、浴槽から戻ってくる浴槽水の温度が低い場合には、風呂追い焚き用熱交換器の温度があまり上がらず、燃焼排気中の水分が風呂追い焚き用熱交換器に冷却されて結露が生じてしまう。 If the opening of the gas proportional valve during simultaneous combustion is small due to priority on the hot water supply side and the temperature of the bath water returning from the bath is low, the temperature of the heat exchanger for bath reheating does not rise so much and combustion Moisture in the exhaust is cooled by the heat exchanger for bathing, and condensation occurs.
そこで、上記の結露を防止するための制御が各種提案されている。たとえば、下記特許文献1には、同時燃焼時に、風呂追い焚き用熱交換器から出る循環水の温度に基づいて結露の可能性を判定し、結露の可能性があると判定した場合に、風呂追い焚き用バーナの燃焼を一時的に中断させる技術が開示される。 Therefore, various controls for preventing the above-mentioned condensation have been proposed. For example, in Patent Document 1 described below, when simultaneous combustion is performed, the possibility of condensation is determined based on the temperature of circulating water from a bath-heating heat exchanger, and it is determined that there is a possibility of condensation. A technique for temporarily interrupting combustion of a reheating burner is disclosed.
また、下記特許文献2には、同時燃焼時に、風呂追い焚き用熱交換器への入水温度が所定温度より低く、かつ、ガス比例弁の開度が所定以下の場合に、風呂追い焚き用熱交換器を経由して浴槽水を循環させる循環ポンプの速度を下げて流量を減少させる制御が開示される。風呂追い焚き用熱交換器を流れる浴槽水の流量を下げることで、風呂追い焚き用熱交換器の温度低下を少なくして結露の防止を図っている。 Further, Patent Document 2 below discloses a bath reheating heat when the temperature of water entering the heat exchanger for reheating the bath is lower than a predetermined temperature and the opening of the gas proportional valve is equal to or lower than a predetermined temperature at the time of simultaneous combustion. Control is disclosed in which the flow rate is reduced by reducing the speed of a circulation pump that circulates bathtub water through an exchanger. By reducing the flow rate of the bathtub water that flows through the bath-heating heat exchanger, the temperature drop of the bath-heating heat exchanger is reduced to prevent condensation.
給湯用熱交換器を加熱するためのバーナを収める缶体(燃焼室)と、風呂追い焚き用熱交換器を加熱するためのバーナを収める缶体とを完全に分けて構成するとコストが嵩む。そこで、これらのバーナを共通の缶体の中の左右に分けて収め、それぞれの上方に給湯用熱交換器および風呂追い焚き用熱交換器を配置すると共に、給湯用熱交換器と風呂追い焚き用熱交換器のフィンを繋げた構成とし、該フィンより下方の缶体内を仕切り板で仕切って2つの燃焼室とする構造のものがある(たとえば、特許文献3参照)。 If the can body (combustion chamber) for storing the burner for heating the hot water supply heat exchanger and the can body for storing the burner for heating the heat exchanger for bathing are completely separated, the cost increases. Therefore, these burners are divided into left and right inside a common can body, and a hot water supply heat exchanger and a bath reheating heat exchanger are arranged above each, and a hot water supply heat exchanger and a reheating bath are disposed. There is a structure in which the fins of the heat exchanger are connected and the inside of the can below the fins is partitioned by a partition plate to form two combustion chambers (see, for example, Patent Document 3).
このような構造の燃焼室を用いた場合、給湯用バーナの燃焼による熱が、ある程度、風呂追い焚き用熱交換器に伝熱するので、同時燃焼させた場合に風呂追い焚き用熱交換器での結露の発生状況が従来と異なってくる。そのため、特許文献1に開示されたような基準で結露の可能性を判定すると、結露の発生までにまだ余裕があるにも関わらず風呂追い焚き用バーナの燃焼を中断してしまい、風呂の追い焚きの効率が必要以上に低下してしまう。 When a combustion chamber with such a structure is used, the heat from the combustion of the hot water burner is transferred to a certain degree to the heat exchanger for reheating the bath. The occurrence of dew condensation is different from the conventional one. For this reason, if the possibility of condensation is determined based on the criteria disclosed in Patent Document 1, the combustion of the bath-burning burner is interrupted even though there is still room before the occurrence of condensation, and the bath The efficiency of sowing will be reduced more than necessary.
本発明は、上記の問題を解決するために成されたものであり、給湯側から風呂追い焚き用熱交換器に熱が回り込む構造において、同時燃焼時の結露の発生を抑制しつつ、風呂追い焚き側の燃焼の中断を減らして風呂の追い焚きの効率の低下を防ぐことのできる風呂給湯器を提供することを目的としている。 The present invention has been made to solve the above-described problems. In a structure in which heat flows from a hot water supply side to a heat exchanger for reheating a bath, the occurrence of dew condensation during simultaneous combustion is suppressed, and It is an object of the present invention to provide a bath water heater that can reduce the interruption of combustion on the burning side and prevent a decrease in the efficiency of reheating the bath.
かかる目的を達成するための本発明の要旨とするところは、次の各項の発明に存する。 The gist of the present invention for achieving the object lies in the inventions of the following items.
[1]給湯用熱交換器と、
前記給湯用熱交換器を加熱する給湯バーナと、
前記給湯用熱交換器と熱的に繋がっている、風呂追い焚き用熱交換器と、
前記風呂追い焚き用熱交換器を加熱する風呂バーナと、
前記給湯バーナと前記風呂バーナに共通に設けられて、これらに供給するガス量を調整するための比例弁と、
前記給湯バーナにガスを供給するか否かを切り替える第1遮断弁と、
前記風呂バーナにガスを供給するか否かを切り替える第2遮断弁と、
前記風呂追い焚き用熱交換器への入水温度を検出する温度センサと、
風呂追い焚き時に、浴槽水を、前記風呂追い焚き用熱交換器を経由して循環させる循環ポンプと、
前記給湯バーナおよび前記風呂バーナの燃焼を制御する制御部と
を有し、
前記制御部は、給湯と風呂追い焚きを同時に行う場合に、給湯側を優先して前記比例弁の開度を制御すると共に、前記温度センサの検出温度と前記風呂バーナの燃焼量にさらに前記給湯用熱交換器側から前記風呂追い焚き用熱交換器へ伝わる熱量を加味して、前記風呂追い焚き用熱交換器で結露するか否かを判定し、結露すると判定した場合に前記第2遮断弁により前記風呂バーナへのガスの供給を遮断する結露防止制御を行う
ことを特徴とする風呂給湯器。
[1] a heat exchanger for hot water supply;
A hot water supply burner for heating the hot water supply heat exchanger;
A heat exchanger for bathing, which is thermally connected to the heat exchanger for hot water supply,
A bath burner for heating the bath-heating heat exchanger;
A proportional valve for adjusting the amount of gas supplied to the hot-water supply burner and the bath burner;
A first shutoff valve for switching whether to supply gas to the hot water burner;
A second shut-off valve for switching whether to supply gas to the bath burner;
A temperature sensor for detecting a temperature of water entering the heat exchanger for bathing,
A circulation pump that circulates the bath water via the heat exchanger for bathing when bathing,
A controller for controlling the combustion of the hot water burner and the bath burner,
The controller controls the opening of the proportional valve with priority given to the hot water supply side when performing hot water supply and bath reheating at the same time, and further adds the hot water supply to the detected temperature of the temperature sensor and the combustion amount of the bath burner. In consideration of the amount of heat transmitted from the heat exchanger side to the bath-heating heat exchanger, it is determined whether or not condensation occurs in the bath-heating heat exchanger. A bath water heater characterized by performing dew condensation prevention control that shuts off gas supply to the bath burner by means of a valve.
上記発明では、給湯用熱交換器と風呂追い焚き用熱交換器は熱的に繋がっているので、同時燃焼時に給湯側の熱が風呂追い焚き側に伝熱する。そこで、給湯と風呂追い焚きを同時に行う場合には、風呂戻り温度と風呂バーナの燃焼量にさらに給湯用熱交換器側から風呂追い焚き用熱交換器へ伝わる熱量を加味して、風呂追い焚き用熱交換器で結露するか否かを判定する。熱的に繋がる例として、たとえば、給湯用熱交換器と風呂追い焚き用熱交換器のフィンが繋がっている場合や、缶体内を仕切る仕切り板や缶体そものもを介して伝熱する場合などがある。 In the above invention, since the hot water supply heat exchanger and the bath reheating heat exchanger are thermally connected, the heat on the hot water supply side is transferred to the bath reheating side during simultaneous combustion. Therefore, when performing hot water supply and bath reheating at the same time, bath reheating takes into account the amount of heat transmitted from the hot water supply heat exchanger to the bath reheating heat exchanger in addition to the return temperature of the bath and the combustion amount of the bath burner. It is determined whether or not condensation occurs in the heat exchanger. As examples of thermal connection, for example, when the heat exchanger for hot water supply and the fin of the heat exchanger for bathing are connected, or when the heat is transferred via the partition plate and the can itself and so on.
[2]前記制御部は、前記温度センサの検出温度と前記風呂バーナの燃焼量と前記給湯バーナの燃焼量に基づいて、前記結露の有無を判定する
ことを特徴とする[1]に記載の風呂給湯器。
[2] The control unit determines the presence or absence of the dew condensation based on a temperature detected by the temperature sensor, a combustion amount of the bath burner, and a combustion amount of the hot water supply burner. Bath water heater.
上記発明では、給湯用熱交換器側から風呂追い焚き用熱交換器へ伝わる熱量は給湯バーナの燃焼量に対応している。そこで、温度センサの検出温度と風呂バーナの燃焼量と給湯バーナの燃焼量に基づいて結露の有無を判定する。 In the above invention, the amount of heat transferred from the hot water supply heat exchanger side to the bath reheating heat exchanger corresponds to the combustion amount of the hot water burner. Therefore, the presence or absence of condensation is determined based on the temperature detected by the temperature sensor, the combustion amount of the bath burner, and the combustion amount of the hot water supply burner.
[3]前記制御部は、前記温度センサの検出温度と前記給湯バーナの燃焼量に基づいて、前記結露の有無を判定する
ことを特徴とする[1]に記載の風呂給湯器。
[3] The bath water heater according to [1], wherein the controller determines the presence or absence of the dew condensation based on a temperature detected by the temperature sensor and a combustion amount of the hot water burner.
上記発明では、風呂バーナの燃焼量は比例弁が共通のため給湯バーナの燃焼量から一義的に定まる。従って、風呂バーナの燃焼量と給湯用熱交換器側から風呂追い焚き用熱交換器へ伝わる熱量とは、給湯バーナの燃焼量に対応する。そこで、風呂戻り温度と給湯バーナの燃焼量とから結露の有無を推定する。 In the above invention, the combustion amount of the bath burner is uniquely determined from the combustion amount of the hot water supply burner because the proportional valve is common. Therefore, the amount of combustion of the bath burner and the amount of heat transmitted from the hot water supply heat exchanger side to the bath reheating heat exchanger correspond to the combustion amount of the hot water supply burner. Therefore, the presence or absence of condensation is estimated from the bath return temperature and the combustion amount of the hot water supply burner.
[4]前記給湯バーナは、複数のサブバーナで構成されており、
前記第1遮断弁は、前記サブバーナのうち、燃焼ガスの供給を遮断するサブバーナの数および場所を選択でき、
前記制御部は、前記給湯バーナ全体の燃焼量を、前記比例弁の開度と、前記給湯バーナのうち燃焼ガスの供給を遮断するサブバーナの数および場所の切り替えによって制御し、
前記結露の有無の判定において、どの前記サブバーナが燃焼しているかを加味する
ことを特徴とする[2]または[3]に記載の風呂給湯器。
[4] The hot-water supply burner is composed of a plurality of sub-burners,
The first shut-off valve can select the number and location of sub-burners that cut off the supply of combustion gas among the sub-burners,
The controller controls the combustion amount of the entire hot water burner by switching the opening of the proportional valve and the number and location of the sub burners that block the supply of combustion gas in the hot water burner,
The bath water heater according to [2] or [3], wherein in the determination of the presence or absence of condensation, which sub-burner is burning is considered.
上記発明では、同じ燃焼量であってもどのサブバーナが燃焼するか(風呂追い焚き用熱交換器に近いバーナか否か)によって給湯用熱交換器側から風呂追い焚き用熱交換器へ伝わる熱量が変わるので、結露の有無の判定において、どのサブバーナが燃焼しているかを加味する。 In the above invention, the amount of heat transmitted from the hot water supply heat exchanger side to the bath reheating heat exchanger depending on which sub-burner burns even if the combustion amount is the same (whether the burner is close to the bath reheating heat exchanger). Therefore, in determining whether or not condensation has occurred, which subburner is burned is taken into consideration.
[5]前記風呂追い焚き用熱交換器は、潜熱および顕熱を回収する潜熱回収型熱交換器である
ことを特徴とする[1]乃至[4]のいずれか1つに記載の風呂給湯器。
[5] The bath hot water supply according to any one of [1] to [4], wherein the bath-heating heat exchanger is a latent heat recovery type heat exchanger that recovers latent heat and sensible heat. vessel.
[6]前記温度センサは、前記風呂追い焚き用熱交換器の顕熱回収部への入水温度を検出する
ことを特徴とする[5]に記載の風呂給湯器。
[6] The bath water heater according to [5], wherein the temperature sensor detects a temperature of water entering the sensible heat recovery section of the bath-heating heat exchanger.
上記発明では、顕熱回収部での結露を防止するためには、顕熱回収部への入水温度に基づいて結露の有無を判定することが望ましい。 In the said invention, in order to prevent dew condensation in a sensible heat collection | recovery part, it is desirable to determine the presence or absence of dew condensation based on the temperature of the incoming water to a sensible heat collection part.
本発明に係る風呂給湯器によれば、給湯側から風呂追い焚き側に伝わる熱量を考慮に入れるので、同時燃焼時の結露の発生を抑制しつつ、風呂追い焚き側の燃焼の中断を減らして風呂の追い焚きの効率低下を防ぐことができる。 According to the bath water heater according to the present invention, since the amount of heat transmitted from the hot water supply side to the bath reheating side is taken into consideration, it is possible to reduce the interruption of combustion on the bath reheating side while suppressing the occurrence of condensation during simultaneous combustion. It is possible to prevent a decrease in the efficiency of bathing.
以下、図面に基づき本発明の実施の形態を説明する。 Hereinafter, embodiments of the present invention will be described with reference to the drawings.
図1は、本発明の実施の形態に係る風呂給湯器10の概略構成を示す図である。風呂給湯器10は、給水を加熱して所定の出湯栓へ給湯する給湯機能、浴槽2へ注湯(湯張り)する注湯機能、浴槽2内の湯水(浴槽水)を追い焚きする風呂追い焚き機能などを備えている。 FIG. 1 is a diagram showing a schematic configuration of a bath water heater 10 according to an embodiment of the present invention. The bath water heater 10 is a hot water supply function that heats the water supply and supplies it to a predetermined tap, a pouring function that pours (fills in) the bathtub 2, and a bath chase that replenishes hot water (tub water) in the bathtub 2. Has a whispering function.
風呂給湯器10は、燃焼ファン11が送風する空気が下方から送り込まれ、上部に排気口12を備えた縦長筒状の燃焼室13を備えている。燃焼室13は、内部が縦向きの仕切り板14によって2室に仕切られており、その一方に給湯バーナ21が配置され、他方に風呂バーナ31が配置されている。給湯バーナ21は、仕切り板14に近い順に、バーナA、バーナB、バーナCの3つで構成される。風呂バーナ31は、1つのバーナで構成される。 The bath water heater 10 is provided with a vertically long cylindrical combustion chamber 13 into which air blown by the combustion fan 11 is sent from below and provided with an exhaust port 12 at the top. The combustion chamber 13 is partitioned into two chambers by a vertically-dividing partition plate 14, a hot water supply burner 21 is disposed on one side, and a bath burner 31 is disposed on the other side. The hot water supply burner 21 is composed of three burners A, burner B, and burner C in the order closer to the partition plate 14. The bath burner 31 is composed of one burner.
給湯バーナ21の上方には、該給湯バーナ21からの熱で給水を加熱するための給湯用熱交換器22が配置されている。風呂バーナ31の上方には、風呂バーナ31からの熱で浴槽水を加熱するための風呂用熱交換器32が配置されている。 Above the hot water supply burner 21, a hot water supply heat exchanger 22 for heating the supplied water with heat from the hot water supply burner 21 is disposed. Above the bath burner 31, a bath heat exchanger 32 for heating the bath water with heat from the bath burner 31 is arranged.
給湯用熱交換器22は、主に排気の顕熱を回収する給湯用顕熱熱交換器22aと、排気の流れで給湯用顕熱熱交換器22aの下流に配置されて、主として排気の潜熱を回収する給湯用潜熱熱交換器22bで構成される。 The hot water supply heat exchanger 22 is arranged downstream of the hot water sensible heat exchanger 22a mainly by the sensible heat exchanger 22a for recovering sensible heat of the exhaust gas, and mainly in the latent heat of the exhaust gas. It is comprised with the latent heat exchanger 22b for hot water supply which collect | recovers.
同様に、風呂用熱交換器32は、主に排気の顕熱を回収する風呂用顕熱熱交換器32aと、排気の流れで風呂用顕熱熱交換器32aの下流に配置されて、主として排気の潜熱を回収する風呂用潜熱熱交換器32bで構成される。 Similarly, the bath heat exchanger 32 is disposed downstream of the bath sensible heat exchanger 32a mainly by the sensible heat exchanger 32a for recovering the sensible heat of the exhaust, and mainly in the exhaust flow. It comprises a bath latent heat exchanger 32b that collects the latent heat of the exhaust.
燃焼ガスの供給元に接続されるガス供給管40の途中には、供給元からの燃焼ガスを遮断するか否かを切り替える元ガス電磁弁41が設けられ、その下流には、給湯バーナ21や風呂バーナ31に供給する燃焼ガスの量を任意に調整するためのガス比例弁42が設けてある。ガス供給管40は、ガス比例弁42の下流で4つに分岐し、分岐後の各ガス供給管40は、給湯バーナ21のバーナA、バーナB、バーナC、および風呂バーナ31に至っている。 In the middle of the gas supply pipe 40 connected to the combustion gas supply source, there is provided a source gas electromagnetic valve 41 for switching whether or not the combustion gas from the supply source is shut off, and downstream of the hot water supply burner 21 and A gas proportional valve 42 for arbitrarily adjusting the amount of combustion gas supplied to the bath burner 31 is provided. The gas supply pipe 40 branches into four downstream of the gas proportional valve 42, and each of the branched gas supply pipes 40 reaches the burner A, the burner B, the burner C, and the bath burner 31 of the hot water supply burner 21.
4つに分岐した後のガス供給管40のそれぞれには、燃焼ガスの供給を遮断するためのガス電磁弁43〜46が設けてある。詳細には、ガス比例弁42からバーナAに向かうガス供給管40の途中には第1給湯ガス電磁弁43が、ガス比例弁42からバーナBに向かうガス供給管40の途中には第2給湯ガス電磁弁44が、ガス比例弁42からバーナCに向かうガス供給管40の途中には第3給湯ガス電磁弁45が、ガス比例弁42から風呂バーナ31に向かうガス供給管40の途中には風呂ガス電磁弁46が設けてある。 Each of the gas supply pipes 40 branched into four is provided with gas electromagnetic valves 43 to 46 for shutting off the supply of combustion gas. Specifically, the first hot water gas electromagnetic valve 43 is provided in the middle of the gas supply pipe 40 from the gas proportional valve 42 to the burner A, and the second hot water supply is provided in the middle of the gas supply pipe 40 from the gas proportional valve 42 to the burner B. The gas solenoid valve 44 is in the middle of the gas supply pipe 40 from the gas proportional valve 42 to the burner C, and the third hot water gas solenoid valve 45 is in the middle of the gas supply pipe 40 from the gas proportional valve 42 to the bath burner 31. A bath gas solenoid valve 46 is provided.
給水元から給水の供給を受ける給水管50は、給湯用潜熱熱交換器22bの入側に接続され、給湯用潜熱熱交換器22bの出側は給湯用顕熱熱交換器22aの入側に接続され、給湯用顕熱熱交換器22aの出側には、出湯栓に通じる給湯管51が接続されている。給湯用潜熱熱交換器22bの入側に至る給水管50の途中には、給水管50を流れる給水の水量を検出する水量センサ52が設けてあり、その下流隣には給水元からの給水量を調整(制限)するための水量サーボ53が設けてある。水量サーボ53の下流の所定箇所で給水管50から分岐したバイパス管54は、給湯管51の所定箇所に合流し接続されている。給水管50からバイパス管54が分岐する箇所には、バイパス管54側に流す給水量を調整するためのバイパスサーボ55が設けてある。 A water supply pipe 50 that receives supply of water from a water supply source is connected to the inlet side of the hot water latent heat exchanger 22b, and the outlet side of the hot water latent heat exchanger 22b is connected to the inlet side of the hot water sensible heat exchanger 22a. A hot water supply pipe 51 leading to the hot water tap is connected to the outlet side of the sensible heat exchanger 22a for hot water supply. A water amount sensor 52 for detecting the amount of water supplied through the water supply pipe 50 is provided in the middle of the water supply pipe 50 leading to the inlet side of the hot water latent heat exchanger 22b. A water amount servo 53 for adjusting (restricting) is provided. A bypass pipe 54 branched from the water supply pipe 50 at a predetermined position downstream of the water amount servo 53 is joined and connected to a predetermined position of the hot water supply pipe 51. A bypass servo 55 for adjusting the amount of water supplied to the bypass pipe 54 is provided at a location where the bypass pipe 54 branches from the water supply pipe 50.
給湯用顕熱熱交換器22aの出口とバイパス管54の合流箇所との間の給湯管51の所定箇所には、給湯用顕熱熱交換器22aから出て来る湯の温度を検出する熱交温度センサ56が設けてあり、バイパス管54の合流箇所より下流の給湯管51の所定箇所には、給湯温度を検出する給湯温度センサ57が設けてある。 At a predetermined location of the hot water supply pipe 51 between the outlet of the hot water sensible heat exchanger 22a and the junction of the bypass pipe 54, heat exchange for detecting the temperature of the hot water coming out of the hot water sensible heat exchanger 22a. A temperature sensor 56 is provided, and a hot water supply temperature sensor 57 for detecting a hot water supply temperature is provided at a predetermined location of the hot water supply pipe 51 downstream from the joining location of the bypass pipe 54.
風呂用熱交換器32の風呂用潜熱熱交換器32bの入側と、浴槽2に設けられた浴槽水取込口3の間は、風呂戻り管60で接続されている。風呂用潜熱熱交換器32bの出側は風呂用顕熱熱交換器32aの入側に接続され、風呂用顕熱熱交換器32aの出側は、浴槽2に設けられた浴槽水吐出口4に風呂往き管61を通じて接続されている。 A bath return pipe 60 connects the entrance side of the bath latent heat exchanger 32 b of the bath heat exchanger 32 and the bathtub water intake 3 provided in the bathtub 2. The outlet side of the bath latent heat exchanger 32b is connected to the inlet side of the bath sensible heat exchanger 32a, and the outlet side of the bath sensible heat exchanger 32a is the bathtub water discharge port 4 provided in the bathtub 2. Are connected through a bath-out pipe 61.
風呂戻り管60の途中には、浴槽2内の浴槽水を風呂用熱交換器32を経て循環させるための循環ポンプ62が設けてある。更に循環ポンプ62の下流側の風呂戻り管60には、風呂戻り管60に一定以上の湯水の流れがあるか否かを検出するための流水スイッチ63が設けてある。 In the middle of the bath return pipe 60, a circulation pump 62 for circulating the bath water in the bath 2 through the bath heat exchanger 32 is provided. Furthermore, the bath return pipe 60 on the downstream side of the circulation pump 62 is provided with a running water switch 63 for detecting whether or not the bath return pipe 60 has a flow of hot water over a certain level.
循環ポンプ62のやや上流側の風呂戻り管60には、浴槽2から取り込む浴槽水の温度を検出するための風呂戻り温度センサ64が設けてある。風呂往き管61の途中には、風呂往き管61を通じて浴槽2に戻る浴槽水の温度を検出するための風呂往き温度センサ65が設けてある。 The bath return pipe 60 slightly upstream of the circulation pump 62 is provided with a bath return temperature sensor 64 for detecting the temperature of the bath water taken from the bathtub 2. A bath temperature sensor 65 for detecting the temperature of the bath water returning to the bathtub 2 through the bath tube 61 is provided in the middle of the bath tube 61.
さらに、風呂戻り温度センサ64が設けられた箇所の近傍の風呂戻り管60と給湯温度センサ57が設けられた箇所の近傍の給湯管51は連結管66で接続されており、連結管66の途中には、該連結管66を開通状態と遮断状態とに切り替える注湯電磁弁67と、風呂戻り管60側から給湯管51への逆流を防止するための逆止弁68が介挿されている。 Furthermore, the bath return pipe 60 near the place where the bath return temperature sensor 64 is provided and the hot water supply pipe 51 near the place where the hot water supply temperature sensor 57 is provided are connected by a connecting pipe 66. Are inserted with a pouring electromagnetic valve 67 for switching the connecting pipe 66 between an open state and a shut-off state, and a check valve 68 for preventing a back flow from the bath return pipe 60 side to the hot water supply pipe 51. .
燃焼室13の中には、給湯用潜熱熱交換器22b、風呂用潜熱熱交換器32bの下方に配置されて、これらで生じたドレンを受け止めるドレン受け15が設けて有り、ドレン受け15で受け止めたドレンは回収管16を通じて中和器17に送られ、該中和器17で中和された後、排出口から排出される。 In the combustion chamber 13, there is provided a drain receiver 15 that is disposed below the hot water latent heat exchanger 22 b and the bath latent heat exchanger 32 b, and receives the drain generated by these, and receives the drain receiver 15. The drain is sent to the neutralizer 17 through the recovery pipe 16, neutralized by the neutralizer 17, and then discharged from the discharge port.
このほか、風呂給湯器10は、風呂給湯器10の動作を制御する制御部を備えている。制御部には、使用者から各種の設定や運転の指示を受ける操作部および設定内容や運転状況を表示するための表示部を備えたリモートコントローラが接続される。制御部はCPU(Central Processing Unit)、ROM(Read Only Memory)、RAM(Random Access Memory)などを主要部とする回路で構成され、ROMに格納されたプログラムに従ってCPUが各種の処理を実行することで風呂給湯器10としての動作が実現される。 In addition, the bath water heater 10 includes a control unit that controls the operation of the bath water heater 10. Connected to the control unit is an operating unit that receives various settings and driving instructions from the user, and a remote controller that includes a display unit for displaying setting contents and driving conditions. The control unit is composed of circuits having a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. as main parts, and the CPU executes various processes according to programs stored in the ROM. Thus, the operation as the bath water heater 10 is realized.
図2は、燃焼室13の断面の概略および風呂給湯器10の分解斜視図である。図2に示す燃焼室13の断面では、給湯用熱交換器22、風呂用熱交換器32において潜熱熱交換器と顕熱熱交換器を区分けせずに簡略図示してある。給湯用熱交換器22、風呂用熱交換器32は、いずれも、給水や浴槽水が通る受熱管24と、該受熱管24の周囲に取り付けられた多数のフィン(受熱板)25を備えている。給湯用熱交換器22側のフィン25と風呂用熱交換器32側のフィン25は共通化されて繋がっている。フィン25には給湯用熱交換器22と風呂用熱交換器32の間の位置で下方から切り込みが設けてあり、仕切り板14の上端はこの切り込みに挿入されて終端している。 FIG. 2 is a schematic cross-sectional view of the combustion chamber 13 and an exploded perspective view of the bath water heater 10. In the cross section of the combustion chamber 13 shown in FIG. 2, the latent heat exchanger and the sensible heat exchanger are not shown separately in the hot water supply heat exchanger 22 and the bath heat exchanger 32. Each of the hot water supply heat exchanger 22 and the bath heat exchanger 32 includes a heat receiving pipe 24 through which water supply and bath water pass, and a large number of fins (heat receiving plates) 25 attached around the heat receiving pipe 24. Yes. The fins 25 on the hot water supply heat exchanger 22 side and the fins 25 on the bath heat exchanger 32 side are connected in common. The fin 25 is provided with a cut from below at a position between the hot water supply heat exchanger 22 and the bath heat exchanger 32, and the upper end of the partition plate 14 is inserted into this cut and terminates.
給湯用熱交換器22と風呂用熱交換器32のフィン25が繋がっているので、給湯バーナ21を燃焼させた場合、フィン25を通じて、給湯用熱交換器22側の熱が、ある程度、風呂用熱交換器32に伝わる構造になっている(図2の伝熱1)。また、缶体内を仕切る仕切り板14を通じて給湯用熱交換器22から風呂用熱交換器32へ伝熱したり(図2の伝熱2)、受熱管24が貫通している外側の銅製内胴を通じて伝熱したり(図2の伝熱3)する。このようにして給湯用熱交換器22と風呂用熱交換器32は熱的に繋がっている。 Since the heat exchanger 22 for hot water supply and the fin 25 of the heat exchanger 32 for bath are connected, when the hot water burner 21 is combusted, the heat on the side of the heat exchanger 22 for hot water supply passes through the fin 25 to some extent. It has a structure that is transmitted to the heat exchanger 32 (heat transfer 1 in FIG. 2). Further, heat is transferred from the hot water supply heat exchanger 22 to the bath heat exchanger 32 through the partition plate 14 partitioning the inside of the can (heat transfer 2 in FIG. 2), or through the outer copper inner cylinder through which the heat receiving pipe 24 passes. Heat is transferred (heat transfer 3 in FIG. 2). In this way, the hot water supply heat exchanger 22 and the bath heat exchanger 32 are thermally connected.
次に、風呂給湯器10における給湯動作、注湯動作、風呂追い焚き動作、および給湯と風呂追い焚きの同時使用時の動作の概要を説明する。 Next, an outline of the hot water supply operation, the pouring operation, the bath reheating operation, and the operation in simultaneous use of the hot water supply and the bath reheating in the bath water heater 10 will be described.
<給湯動作>
出湯栓が開かれて給水管50内に通水が生じると、該通水が水量センサ52によって検出される。水量センサ52が通水を検出すると、制御部は、給湯バーナ21を点火し、該給湯バーナ21で燃焼ガスを燃焼させる。給水元からの給水は、給湯用潜熱熱交換器22b、給湯用顕熱熱交換器22aを通る際に給湯バーナ21からの排気の熱を受けて加熱され、さらにバイパス管54からの給水と混合された後、出湯栓へ出湯される。制御部は、給湯温度センサ57の検出する給湯温度が給湯設定温度になるように、給湯バーナ21の燃焼量やバイパスサーボ55の開度等を制御する。水量センサ52が通水を検出しなくなると、給湯バーナ21への燃焼ガスの供給を遮断して給湯バーナ21の燃焼を停止させる。
<Hot-water supply operation>
When the hot water tap is opened and water flows through the water supply pipe 50, the water flow is detected by the water amount sensor 52. When the water amount sensor 52 detects water flow, the control unit ignites the hot water supply burner 21 and causes the hot water supply burner 21 to burn combustion gas. The water supply from the water supply source is heated by receiving the heat of the exhaust from the hot water burner 21 when passing through the hot water latent heat exchanger 22b and the hot water sensible heat exchanger 22a, and further mixed with the water supplied from the bypass pipe 54 After that, it is poured out into the tap. The control unit controls the combustion amount of the hot water supply burner 21 and the opening degree of the bypass servo 55 so that the hot water supply temperature detected by the hot water supply temperature sensor 57 becomes the hot water supply set temperature. When the water amount sensor 52 no longer detects water flow, the supply of the combustion gas to the hot water supply burner 21 is cut off and the combustion of the hot water supply burner 21 is stopped.
給湯バーナ21の燃焼量は、バーナA、バーナB、バーナCのうちの1または複数個のどのバーナを燃焼させるかと、ガス比例弁42の開度によって制御される。 The amount of combustion of hot water supply burner 21 is controlled by which one or a plurality of burners among burner A, burner B, and burner C are burned, and the opening of gas proportional valve 42.
図3は、給湯バーナ21の燃焼量とガス比例弁42の開度との関係を示している。要求される燃焼量がF1以下の範囲では、第1給湯ガス電磁弁43、第3給湯ガス電磁弁45は閉じ、第2給湯ガス電磁弁44を開いてバーナBのみを燃焼させ、かつその範囲内での燃焼量はガス比例弁42の開度で調整する。 FIG. 3 shows the relationship between the combustion amount of the hot water supply burner 21 and the opening degree of the gas proportional valve 42. In the range where the required combustion amount is F1 or less, the first hot water supply gas electromagnetic valve 43 and the third hot water supply gas electromagnetic valve 45 are closed, the second hot water supply gas electromagnetic valve 44 is opened, and only the burner B is burned. The amount of combustion inside is adjusted by the opening degree of the gas proportional valve 42.
要求される燃焼量がF1を超えてF2以下の範囲では、第3給湯ガス電磁弁45は閉じ、第1給湯ガス電磁弁43、第2給湯ガス電磁弁44を開いてバーナA、Bを燃焼させ、上記範囲内での燃焼量はガス比例弁42の開度で調整する。 In the range where the required combustion amount exceeds F1 and is equal to or less than F2, the third hot water gas electromagnetic valve 45 is closed, the first hot water gas electromagnetic valve 43 and the second hot water gas electromagnetic valve 44 are opened, and the burners A and B are burned. The combustion amount within the above range is adjusted by the opening degree of the gas proportional valve 42.
要求される燃焼量がF2を超える範囲では、第1給湯ガス電磁弁43、第2給湯ガス電磁弁44、第3給湯ガス電磁弁45をすべて開いてバーナA、B、Cを燃焼させ、上記範囲内での燃焼量はガス比例弁42の開度で調整する。 In the range where the required combustion amount exceeds F2, the first hot water supply gas electromagnetic valve 43, the second hot water supply gas electromagnetic valve 44, and the third hot water supply gas electromagnetic valve 45 are all opened to burn the burners A, B, C. The amount of combustion within the range is adjusted by the opening of the gas proportional valve 42.
<注湯動作>
注湯動作は、リモートコントローラから、風呂の自動運転や注湯の指示を受けた場合に実行される。注湯動作では、制御部は、注湯電磁弁67を開くと共に、給湯バーナ21を点火して該給湯バーナ21で燃焼ガスを燃焼させる。これにより、給水元からの給水は、給湯用潜熱熱交換器22b、給湯用顕熱熱交換器22aを通る際に給湯バーナ21からの排気の熱を受けて加熱され、さらにバイパス管54からの給水と混合された後、連結管66を通じて風呂戻り管60に流れ込み、該風呂戻り管60および風呂往き管61を通じて浴槽2に注湯される。
<Pouring operation>
The pouring operation is executed when an automatic bath operation or pouring instruction is received from the remote controller. In the pouring operation, the control unit opens the pouring electromagnetic valve 67 and ignites the hot water supply burner 21 to burn the combustion gas in the hot water supply burner 21. Thus, the water supply from the water supply source is heated by receiving the heat of the exhaust from the hot water supply burner 21 when passing through the hot water supply latent heat exchanger 22b and the hot water sensible heat exchanger 22a. After being mixed with the water supply, it flows into the bath return pipe 60 through the connecting pipe 66 and is poured into the bathtub 2 through the bath return pipe 60 and the bath outlet pipe 61.
浴槽2が設定された水位になったら注湯動作は停止される。具体的には、注湯電磁弁67を閉じると共に、給湯バーナ21への燃焼ガスの供給を遮断して給湯バーナ21の燃焼を停止させる。 When the bathtub 2 reaches a set water level, the pouring operation is stopped. Specifically, the hot water solenoid valve 67 is closed and the supply of the combustion gas to the hot water supply burner 21 is shut off to stop the combustion of the hot water supply burner 21.
<風呂追い焚き動作>
風呂追い焚き動作は、風呂の自動運転の指示に基づいて上記の注湯動作が行われて設定水位に湯張りされた後、浴槽2内の浴槽水の温度を風呂設定温度まで昇温させるとき、あるいは、風呂の自動運転中に浴槽2内の湯水を風呂設定温度に維持するために昇温するとき、あるいは、使用者から追い焚きの指示を受けた場合に実行される。
<Bath chasing action>
The bath reheating operation is performed when the temperature of the bath water in the bathtub 2 is raised to the bath set temperature after the above-described pouring operation is performed based on the instruction for automatic bath operation and the water is filled to the set water level. Alternatively, it is executed when the temperature of the hot water in the bathtub 2 is raised during the automatic operation of the bath to maintain the bath set temperature, or when a follow-up instruction is received from the user.
風呂追い焚き動作では、制御部は、循環ポンプ62をオンにすると共に、風呂バーナ31を点火して該風呂バーナ31で燃焼ガスを燃焼させる。循環ポンプ62の作用により、浴槽2内の浴槽水は、風呂戻り管60に取り込まれ、該風呂戻り管60、風呂用潜熱熱交換器32b、風呂用顕熱熱交換器32a、風呂往き管61を経て浴槽2に戻るように循環する。浴槽水は、風呂用潜熱熱交換器32b、風呂用顕熱熱交換器32aを通る際に風呂バーナ31からの排気の熱を受けて昇温される。 In the bath reheating operation, the control unit turns on the circulation pump 62 and ignites the bath burner 31 to burn the combustion gas in the bath burner 31. The bath water in the bathtub 2 is taken into the bath return pipe 60 by the action of the circulation pump 62, and the bath return pipe 60, the bath latent heat exchanger 32 b, the bath sensible heat exchanger 32 a, and the bath outlet pipe 61. It circulates so that it may return to bathtub 2 via. The bath water is heated by receiving the heat of the exhaust from the bath burner 31 when passing through the bath latent heat exchanger 32b and the bath sensible heat exchanger 32a.
<給湯と風呂追い焚きの同時使用>
給湯と風呂追い焚きの同時使用は、たとえば、風呂追い焚き動作中に、出湯栓が開かれて給湯する場合等に生じる。給湯と風呂追い焚きの同時使用では、ガス比例弁42の開度は、給湯動作に基づいて(給湯側を優先して)制御される。すなわち、給湯設定温度で給湯するために必要な燃焼量で給湯バーナ21が燃焼するように、ガス比例弁42の開度が、図3の特性等に従って制御される。
<Simultaneous use of hot water supply and bath chasing>
The simultaneous use of hot water supply and bath reheating occurs, for example, when a hot water tap is opened and hot water is supplied during a bath reheating operation. In simultaneous use of hot water supply and bath reheating, the opening degree of the gas proportional valve 42 is controlled based on the hot water supply operation (prioritizing the hot water supply side). That is, the opening degree of the gas proportional valve 42 is controlled in accordance with the characteristics of FIG. 3 and the like so that the hot water supply burner 21 burns with a combustion amount necessary to supply hot water at the hot water supply set temperature.
このとき、ガス比例弁42の開度が小さく、かつ、浴槽2から戻ってくる浴槽水の温度が低い場合には、風呂用熱交換器32(特に、風呂用顕熱熱交換器32a)の温度があまり上がらず、燃焼排気中の水分が風呂用顕熱熱交換器32aで結露する可能性がある。 At this time, when the opening of the gas proportional valve 42 is small and the temperature of the bath water returning from the bathtub 2 is low, the bath heat exchanger 32 (particularly, the sensible heat exchanger 32a for bath) There is a possibility that the temperature does not rise so much and moisture in the combustion exhaust is condensed in the bath sensible heat exchanger 32a.
そこで、本実施の形態に係る風呂給湯器10は、給湯側と風呂側を同時燃焼させた場合に風呂用顕熱熱交換器32aで結露の可能性があるか否かを判定し、結露の可能性があると判定した場合に、風呂バーナ31の燃焼を中断させる制御を行う。 Therefore, the bath water heater 10 according to the present embodiment determines whether or not there is a possibility of condensation in the bath sensible heat exchanger 32a when the hot water supply side and the bath side are burned simultaneously. When it determines with possibility, the control which interrupts the combustion of the bath burner 31 is performed.
この判定においては、図2で説明した、給湯用熱交換器22側からフィン25等を通じて風呂用熱交換器32に伝わる熱量を考慮に入れる。すなわち、風呂戻り温度センサ64の検出温度と風呂バーナ31の燃焼量にさらに給湯用熱交換器22側から風呂用熱交換器32へ伝わる熱量を加味して、給湯用潜熱熱交換器22bで結露するか否かを判定する。 In this determination, the amount of heat transferred from the hot water supply heat exchanger 22 side to the bath heat exchanger 32 through the fins 25 and the like described in FIG. 2 is taken into consideration. That is, the amount of heat transmitted from the hot water supply heat exchanger 22 side to the bath heat exchanger 32 is further added to the temperature detected by the bath return temperature sensor 64 and the combustion amount of the bath burner 31, and dew condensation occurs in the hot water supply latent heat exchanger 22b. It is determined whether or not to do.
具体的には、風呂戻り温度センサ64の検出温度と風呂バーナ31の燃焼量と給湯バーナ21の燃焼量とに基づいて、結露の有無を判定する。 Specifically, the presence or absence of condensation is determined based on the detected temperature of the bath return temperature sensor 64, the combustion amount of the bath burner 31, and the combustion amount of the hot water supply burner 21.
ここで、図3に示すように、給湯バーナ21の燃焼量に対するガス比例弁42の開度は一意に定まるので、給湯バーナ21の燃焼量が定まれば、給湯バーナ21とガス比例弁42を共通使用する風呂バーナ31の燃焼量も定まることになる。したがって、風呂戻り温度センサ64の検出温度と給湯バーナ21の燃焼量とに基づいて結露の有無を判定することは、風呂戻り温度センサ64の検出温度と風呂バーナ31の燃焼量と給湯バーナ21の燃焼量とに基づいて結露の有無を判定することと等価になる。 Here, as shown in FIG. 3, since the opening degree of the gas proportional valve 42 with respect to the combustion amount of the hot water supply burner 21 is uniquely determined, if the combustion amount of the hot water supply burner 21 is determined, the hot water supply burner 21 and the gas proportional valve 42 are set. The amount of combustion of the commonly used bath burner 31 is also determined. Therefore, determining the presence or absence of dew condensation based on the temperature detected by the bath return temperature sensor 64 and the amount of combustion of the hot water supply burner 21 is based on the temperature detected by the bath return temperature sensor 64, the amount of combustion of the bath burner 31, and the hot water supply burner 21. This is equivalent to determining the presence or absence of condensation based on the amount of combustion.
ここでは、図4に示すように、風呂戻り温度センサ64の検出温度(風呂戻り温度)と給湯バーナ21の燃焼量(給湯側燃焼量)と結露の有無との関係を示すデータを、風呂戻り温度と給湯側の燃焼量を様々に変化させて予め求めておき、該データから、風呂戻り温度センサ64の検出温度(風呂戻り温度)と給湯バーナ21の燃焼量(給湯側燃焼量)とを入力値とし、結露の可能性の有無を出力値とするルックアップテーブル(相関データ)を作成しておく。 Here, as shown in FIG. 4, data indicating the relationship between the temperature detected by the bath return temperature sensor 64 (bath return temperature), the combustion amount of the hot water supply burner 21 (hot water supply side combustion amount), and the presence or absence of condensation is used. The temperature and the combustion amount on the hot water supply side are determined in advance, and the detected temperature of the bath return temperature sensor 64 (bath return temperature) and the combustion amount of the hot water supply burner 21 (hot water supply side combustion amount) are determined from the data. A lookup table (correlation data) is created in which the input value is used and the possibility of condensation is output.
そして、該ルックアップテーブルに、現在の風呂戻り温度センサ64の検出温度と制御部が設定している給湯バーナ21の燃焼量とを入力し、その出力値から結露の有無を判定する。 Then, the current detection temperature of the bath return temperature sensor 64 and the combustion amount of the hot water supply burner 21 set by the control unit are input to the lookup table, and the presence or absence of condensation is determined from the output value.
なお、給湯バーナ21の燃焼量に対して、バーナA、B、Cのどのバーナを燃焼させるかは予め定めてあるので、給湯バーナ21の燃焼量からどのバーナが燃焼中かは一義的に定まる。従って、相関データは、どのバーナが燃焼しているかも加味したものになっている。 Note that which burner A, B, or C is burned with respect to the amount of combustion of the hot water supply burner 21 is determined in advance, so which burner is uniquely determined from the amount of combustion of the hot water supply burner 21. . Therefore, the correlation data takes into account which burner is burning.
たとえば、図3に示すように、当初はバーナBのみ、燃焼量がF1を超えるとバーナBとA、F2を超えるとA+B+Cのように制御される場合と、当初はバーナBのみ、燃焼量がF1を超えるとバーナBとC、F2を超えるとA+B+Cのように制御される場合とでは、相関データの内容は異なるものになる。給湯バーナ21の燃焼量とどのバーナを燃焼させるかが一義的に対応しない場合には、どのバーナを燃焼させているかを別のパラメータとして、結露の有無の判定要素に加えればよい。 For example, as shown in FIG. 3, only burner B is initially controlled. When the combustion amount exceeds F1, burner B and A, and when F2 is exceeded, control is performed as A + B + C. When F1 is exceeded, the contents of the correlation data are different between the burners B and C, and when F2 is exceeded, control is performed as A + B + C. If the burn amount of the hot water supply burner 21 does not uniquely correspond to which burner is burned, what burner is burned may be added to the determination element for the presence or absence of condensation as another parameter.
また、給湯バーナ21の燃焼量に応じて燃焼ファン11の風量が変更されるが、給湯バーナ21の各燃焼量に対する風量も一義的に定まっている。したがって、給湯バーナ21の燃焼量をパラメータにすれば、結露の可能性の有無の判定において、燃焼ファン11の風量も考慮したことになる。給湯バーナ21の燃焼量と燃焼ファン11の風量が一義的に定まらない場合は、燃焼ファン11の風量を別のパラメータとして判定の要素に加えればよい。 Moreover, although the air volume of the combustion fan 11 is changed according to the combustion amount of the hot water supply burner 21, the air volume with respect to each combustion amount of the hot water supply burner 21 is also uniquely determined. Therefore, if the combustion amount of the hot water supply burner 21 is used as a parameter, the air volume of the combustion fan 11 is also taken into consideration in the determination of the possibility of condensation. When the combustion amount of the hot water supply burner 21 and the air volume of the combustion fan 11 are not uniquely determined, the air volume of the combustion fan 11 may be added to the determination element as another parameter.
図5は、風呂給湯器10の制御部が行う燃焼制御の処理を示す流れ図である。給湯側、風呂側のいずれかから燃焼要求があるときにこの処理は実行される。同時燃焼の要求があるか否かを調べ(ステップS101)、同時燃焼の要求がなければ(ステップS101;No)、要求側の単独燃焼(前述の給湯動作、注湯動作、風呂追い焚き動作のいずれか)を行い、ステップS107へ移行する。 FIG. 5 is a flowchart showing a combustion control process performed by the control unit of the bath water heater 10. This process is executed when there is a combustion request from either the hot water supply side or the bath side. It is checked whether or not there is a request for simultaneous combustion (step S101). If there is no request for simultaneous combustion (step S101; No), single combustion on the request side (the aforementioned hot water supply operation, pouring operation, bath reheating operation) 1), and the process proceeds to step S107.
同時燃焼要求がある場合は(ステップS101;Yes)、風呂戻り温度センサ64の検出温度(風呂戻り温度)と給湯バーナ21の燃焼量(給湯側燃焼量)とを入力値として図4の相関データから結露の有無の判定結果を取得する(ステップS103)。 When there is a simultaneous combustion request (step S101; Yes), the correlation data of FIG. 4 is input with the detected temperature (bath return temperature) of the bath return temperature sensor 64 and the combustion amount of the hot water supply burner 21 (hot water supply side combustion amount) as input values. The determination result of the presence or absence of condensation is acquired from (step S103).
該判定結果が結露の可能性なしを示す場合は(ステップS104;No)、給湯バーナ21と風呂バーナ31を同時燃焼させて(ステップS105)、ステップS107へ移行する。 When the determination result indicates that there is no possibility of condensation (step S104; No), the hot water supply burner 21 and the bath burner 31 are simultaneously burned (step S105), and the process proceeds to step S107.
ステップS102で得た判定結果が結露の可能性ありを示す場合は(ステップS104;Yes)、風呂ガス電磁弁46を遮断して風呂バーナ31の燃焼をオフし、給湯バーナ21側のみを燃焼させ(ステップS106)、ステップS107へ移行する。 If the determination result obtained in step S102 indicates the possibility of condensation (step S104; Yes), the bath gas electromagnetic valve 46 is shut off to turn off the combustion of the bath burner 31, and only the hot water supply burner 21 side is burned. (Step S106), the process proceeds to Step S107.
ステップS107では、すべての燃焼要求がオフしているか否かを調べ、給湯側、風呂追い焚き側のいずれかの燃焼要求があれば(ステップS107;No)、ステップS101に戻って処理を継続する。すべての燃焼要求がオフならば(ステップS107;Yes)、本処理を終了する。 In step S107, it is checked whether or not all combustion requests are turned off. If there is a combustion request on either the hot water supply side or the bath retreat side (step S107; No), the process returns to step S101 and the processing is continued. . If all the combustion requests are off (step S107; Yes), this process is terminated.
以上、本発明の実施の形態を図面によって説明してきたが、具体的な構成は実施の形態に示したものに限られるものではなく、本発明の要旨を逸脱しない範囲における変更や追加があっても本発明に含まれる。 The embodiment of the present invention has been described with reference to the drawings. However, the specific configuration is not limited to that shown in the embodiment, and there are changes and additions within the scope of the present invention. Are also included in the present invention.
実施の形態では、給湯バーナ21、風呂バーナ31として潜熱熱交換器と顕熱熱交換器を有するタイプを例示したが、顕熱熱交換器のみであっても本発明は適用される。 In the embodiment, the hot water supply burner 21 and the bath burner 31 are exemplified as the types having a latent heat exchanger and a sensible heat exchanger, but the present invention is also applied to a sensible heat exchanger alone.
実施の形態では、結露の有無の判定材料として、風呂戻り温度センサ64の検出温度を使用したが、風呂用熱交換器32の風呂用潜熱熱交換器32bを出てから風呂用顕熱熱交換器32aに入る前の浴槽水の温度を検出する温度センサを設け、該温度センサの検出温度を上記判定材料として使用してもよい。 In the embodiment, the temperature detected by the bath return temperature sensor 64 is used as a material for determining the presence or absence of dew condensation. However, the sensible heat exchange for the bath is performed after leaving the bath latent heat exchanger 32b of the bath heat exchanger 32. A temperature sensor that detects the temperature of the bath water before entering the vessel 32a may be provided, and the temperature detected by the temperature sensor may be used as the determination material.
実施の形態では、ルックアップテーブル形式の相関データを用いて結露の有無を判定したが、相関データに対応するような関数を定義できれば、該関数に、風呂戻り温度、給湯側燃焼量を入力し、該関数の演算結果から結露の有無を判定してもよい。 In the embodiment, the presence or absence of dew condensation is determined using the correlation data in the look-up table format. However, if a function corresponding to the correlation data can be defined, the bath return temperature and the hot water side combustion amount are input to the function. The presence or absence of condensation may be determined from the calculation result of the function.
2…浴槽
3…浴槽水取込口
4…浴槽水吐出口
10…風呂給湯器
11…燃焼ファン
12…排気口
13…燃焼室
14…仕切り板
15…ドレン受け
16…回収管
17…中和器
21…給湯バーナ(バーナA、B、C)
22…給湯用熱交換器
22a…給湯用顕熱熱交換器
22b…給湯用潜熱熱交換器
24…受熱管
25…フィン
31…風呂バーナ
32…風呂用熱交換器
32a…風呂用顕熱熱交換器
32b…風呂用潜熱熱交換器
40…ガス供給管
41…元ガス電磁弁
42…ガス比例弁
43…第1給湯ガス電磁弁
44…第2給湯ガス電磁弁
45…第3給湯ガス電磁弁
46…風呂ガス電磁弁
50…給水管
51…給湯管
52…水量センサ
53…水量サーボ
54…バイパス管
55…バイパスサーボ
56…熱交温度センサ
57…給湯温度センサ
60…風呂戻り管
61…風呂往き管
62…循環ポンプ
63…流水スイッチ
64…風呂戻り温度センサ
65…風呂往き温度センサ
66…連結管
67…注湯電磁弁
68…逆止弁
DESCRIPTION OF SYMBOLS 2 ... Bathtub 3 ... Bathtub water intake 4 ... Bathtub water discharge port 10 ... Bath water heater 11 ... Combustion fan 12 ... Exhaust port 13 ... Combustion chamber 14 ... Partition plate 15 ... Drain receptacle 16 ... Collection pipe 17 ... Neutralizer 21 ... Hot-water supply burner (Burner A, B, C)
22 ... Heat exchanger for hot water supply 22a ... Sensible heat exchanger for hot water supply 22b ... Latent heat exchanger for hot water supply 24 ... Heat receiving pipe 25 ... Fin 31 ... Bath burner 32 ... Heat exchanger for bath 32a ... Sensible heat exchange for bath 32b ... Bath latent heat exchanger 40 ... Gas supply pipe 41 ... Original gas solenoid valve 42 ... Gas proportional valve 43 ... First hot water gas solenoid valve 44 ... Second hot water gas solenoid valve 45 ... Third hot water gas solenoid valve 46 ... Bath gas solenoid valve 50 ... Water supply pipe 51 ... Hot water supply pipe 52 ... Water quantity sensor 53 ... Water quantity servo 54 ... Bypass pipe 55 ... Bypass servo 56 ... Heat exchange temperature sensor 57 ... Hot water temperature sensor 60 ... Bath return pipe 61 ... Bath return pipe 62 ... Circulating pump 63 ... Flowing water switch 64 ... Bath return temperature sensor 65 ... Bathing temperature sensor 66 ... Connecting pipe 67 ... Pouring solenoid valve 68 ... Check valve
Claims (6)
前記給湯用熱交換器を加熱する給湯バーナと、
前記給湯用熱交換器と熱的に繋がっている、風呂追い焚き用熱交換器と、
前記風呂追い焚き用熱交換器を加熱する風呂バーナと、
前記給湯バーナと前記風呂バーナに共通に設けられて、これらに供給するガス量を調整するための比例弁と、
前記給湯バーナにガスを供給するか否かを切り替える第1遮断弁と、
前記風呂バーナにガスを供給するか否かを切り替える第2遮断弁と、
前記風呂追い焚き用熱交換器への入水温度を検出する温度センサと、
風呂追い焚き時に、浴槽水を、前記風呂追い焚き用熱交換器を経由して循環させる循環ポンプと、
前記給湯バーナおよび前記風呂バーナの燃焼を制御する制御部と
を有し、
前記制御部は、給湯と風呂追い焚きを同時に行う場合に、給湯側を優先して前記比例弁の開度を制御すると共に、前記温度センサの検出温度と前記風呂バーナの燃焼量にさらに前記給湯用熱交換器側から前記風呂追い焚き用熱交換器へ伝わる熱量を加味して、前記風呂追い焚き用熱交換器で結露するか否かを判定し、結露すると判定した場合に前記第2遮断弁により前記風呂バーナへのガスの供給を遮断する結露防止制御を行う
ことを特徴とする風呂給湯器。 A heat exchanger for hot water supply,
A hot water supply burner for heating the hot water supply heat exchanger;
A heat exchanger for bathing, which is thermally connected to the heat exchanger for hot water supply,
A bath burner for heating the bath-heating heat exchanger;
A proportional valve for adjusting the amount of gas supplied to the hot-water supply burner and the bath burner;
A first shutoff valve for switching whether to supply gas to the hot water burner;
A second shut-off valve for switching whether to supply gas to the bath burner;
A temperature sensor for detecting a temperature of water entering the heat exchanger for bathing,
A circulation pump that circulates the bath water via the heat exchanger for bathing when bathing,
A controller for controlling the combustion of the hot water burner and the bath burner,
The controller controls the opening of the proportional valve with priority given to the hot water supply side when performing hot water supply and bath reheating at the same time, and further adds the hot water supply to the detected temperature of the temperature sensor and the combustion amount of the bath burner. In consideration of the amount of heat transmitted from the heat exchanger side to the bath-heating heat exchanger, it is determined whether or not condensation occurs in the bath-heating heat exchanger. A bath water heater characterized by performing dew condensation prevention control that shuts off gas supply to the bath burner by means of a valve.
ことを特徴とする請求項1に記載の風呂給湯器。 2. The bath water heater according to claim 1, wherein the controller determines the presence or absence of the dew condensation based on a temperature detected by the temperature sensor, a combustion amount of the bath burner, and a combustion amount of the hot water supply burner. .
ことを特徴とする請求項1に記載の風呂給湯器。 The bath water heater according to claim 1, wherein the control unit determines the presence or absence of the dew condensation based on a temperature detected by the temperature sensor and a combustion amount of the hot water supply burner.
前記第1遮断弁は、前記サブバーナのうち、燃焼ガスの供給を遮断するサブバーナの数および場所を選択でき、
前記制御部は、前記給湯バーナ全体の燃焼量を、前記比例弁の開度と、前記給湯バーナのうち燃焼ガスの供給を遮断するサブバーナの数および場所の切り替えによって制御し、
前記結露の有無の判定において、どの前記サブバーナが燃焼しているかを加味する
ことを特徴とする請求項2または3に記載の風呂給湯器。 The hot water burner is composed of a plurality of sub-burners,
The first shut-off valve can select the number and location of sub-burners that cut off the supply of combustion gas among the sub-burners,
The controller controls the combustion amount of the entire hot water burner by switching the opening of the proportional valve and the number and location of the sub burners that block the supply of combustion gas in the hot water burner,
The bath water heater according to claim 2 or 3, wherein in the determination of the presence or absence of dew condensation, the sub-burner that is burning is taken into account.
ことを特徴とする請求項1乃至4のいずれか1つに記載の風呂給湯器。 The bath water heater according to any one of claims 1 to 4, wherein the bath-heating heat exchanger is a latent heat recovery type heat exchanger that recovers latent heat and sensible heat.
ことを特徴とする請求項5に記載の風呂給湯器。 6. The bath water heater according to claim 5, wherein the temperature sensor detects a temperature of water entering the sensible heat recovery unit of the heat exchanger for reheating the bath.
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JP4071224B2 (en) * | 2004-04-19 | 2008-04-02 | リンナイ株式会社 | 1 can type combined heat source machine |
JP2010106883A (en) * | 2008-10-28 | 2010-05-13 | Noritz Corp | Check valve and bath device using the same |
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