JP5600616B2 - Latent heat recovery type water heater - Google Patents

Latent heat recovery type water heater Download PDF

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JP5600616B2
JP5600616B2 JP2011022549A JP2011022549A JP5600616B2 JP 5600616 B2 JP5600616 B2 JP 5600616B2 JP 2011022549 A JP2011022549 A JP 2011022549A JP 2011022549 A JP2011022549 A JP 2011022549A JP 5600616 B2 JP5600616 B2 JP 5600616B2
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water
drain
combustion
neutralization tank
water level
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JP2012163237A (en
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貴宏 木村
聡 古舘
進 阿部
竹年 田村
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Corona Corp
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Description

この発明は、ドレン中和槽の逆風による水封の破れの誤検知を確実に阻止した潜熱回収型給湯機に関するものである。   The present invention relates to a latent heat recovery type hot water heater that reliably prevents erroneous detection of water seal breakage due to the back wind of a drain neutralization tank.

従来よりこの種の潜熱回収型の燃焼装置に於いては、屋内に設置するタイプのものがあり、この屋内設置タイプの場合、燃焼によって発生したドレンを排出するためのドレン排水経路を通って、燃焼排ガスが屋内に排出されないように、ドレン排水経路をドレンまたは水により水封する必要がある。そのため、ドレン排水経路に水封を検知する水位検知電極を設け、水位検知電極が水封を検知していない場合は、燃焼できないようにロックするものがあった。（例えば、特許文献１参照。）   Conventionally, in this type of latent heat recovery type combustion apparatus, there is a type that is installed indoors. In the case of this indoor installation type, through a drain drainage path for discharging drainage generated by combustion, It is necessary to seal the drain drainage path with drain or water so that the combustion exhaust gas is not discharged indoors. Therefore, a water level detection electrode for detecting a water seal is provided in the drain drainage path, and when the water level detection electrode does not detect the water seal, there is a lock to prevent combustion. (For example, refer to Patent Document 1.)

特開２００８−２９８３８１号公報JP 2008-298381 A

ところで図４に示すように、スペースの問題から水位検知電極１７を排水口１５側の連通路１６に備えたドレン中和槽１０では、排気経路９と連通している為に、図６に示すように強い逆風を受けた場合にその風圧が流入口１１側のドレン水の水面に作用して押し下げられることで、排水口１５からドレン水が押し出されるかたちで、排水されてドレン水が減少することにより、逆風が収まり風圧がなくなると図７に示すように水位検知電極１７部分にはドレン水がなくなり、水封状態は維持しているにも拘わらず、水封が破られていると検知して燃焼が出来なくなると言う不具合を発生するものであった。   As shown in FIG. 4, the drain neutralization tank 10 provided with the water level detection electrode 17 in the communication passage 16 on the drain outlet 15 side is in communication with the exhaust path 9 because of space problems. When the strong back wind is received, the wind pressure acts on the water surface of the drain water on the inflow port 11 side and is pushed down, so that the drain water is pushed out from the drain port 15 and the drain water is reduced. As shown in FIG. 7, when the back wind is settled and the wind pressure disappears, the water level detection electrode 17 portion has no drain water, and it is detected that the water seal is broken although the water seal state is maintained. As a result, there was a problem that combustion was impossible.

この発明はこの点に着目し上記課題を解決する為に、特にその構成を、バーナの燃焼後の排気ガスが露点以下になることで発生するドレン水を、予め中和剤が充填されたドレン中和槽を流通させることで中和するものに於いて、前記ドレン中和槽には、上面に排気経路と連通しドレン水の入り口となる流入口と、一側壁上部には中和後のドレン水を流出させる流出口とを設け、この流出口近傍には一対の水位検知電極を備え、熱要求発生時水位検知電極によってドレン中和槽のドレン水位が低下しての水封破れを検知した時、排気ファンを駆動し再度水封破れを検知するようにしたものである。   This invention pays attention to this point and solves the above-mentioned problem. In particular, the construction is such that drain water generated when the exhaust gas after combustion of the burner falls below the dew point is drained with a neutralizer filled in advance. In what is neutralized by circulating a neutralization tank, the drain neutralization tank has an upper surface communicating with an exhaust path and an inlet serving as an inlet for drain water, and an upper portion of one side wall after neutralization. An outlet for draining drain water is provided, and a pair of water level detection electrodes are provided in the vicinity of the outlet, and the water level detection electrode detects the water seal breakage when the drain water level in the drain neutralization tank drops when the heat demand is generated. In this case, the exhaust fan is driven to detect the water seal again.

又請求項２では、前記排気ファンの駆動しての再度の水封破れ検知で、水封破れを検知した時にはエラー報知し、水封なしの場合には、燃焼開始してから一定時間経過後、再び水封検知を行うようにしたものである。   Further, in claim 2, when the water seal breakage is detected again by driving the exhaust fan, an error is notified when the water seal breakage is detected, and in the case of no water seal, after a certain period of time has elapsed since the start of combustion. The water seal detection is performed again.

この発明によれば、熱要求発生時には先ず水位検知電極による水封破れを検知し、水封破れを検知した時には、逆風による水封破れを考慮して排気ファンを駆動した状態で、再度水封を検知して燃焼開始に入るようにしたことにより、逆風による水封破れの誤検知が阻止され、通常通りの燃焼による給湯が良好に行われるものである。   According to the present invention, when a heat request is generated, a water seal breakage is first detected by the water level detection electrode, and when a water seal breakage is detected, the exhaust fan is driven in consideration of the water seal breakage caused by the back wind, By detecting this and starting the combustion, erroneous detection of water seal breakage due to the back wind is prevented, and hot water supply by normal combustion is performed satisfactorily.

又請求項２によれば、逆風による水封破れでなく水漏れで水封破れした場合は、ここでエラー報知されて極めて安全であり、更に逆風による水封破れの時には排気ファンの風圧で水位検知してひとまず燃焼開始し、ドレン水の補給をドレン中和槽に行うので、一定時間経過後には最後の水封破れ検知をして、このドレン水の補給が上手く行われたかの確認をすることで、安全に燃焼を継続出来て安心して使用することが出来るものである。   Further, according to claim 2, when the water seal is broken due to water leakage instead of the water break due to the reverse wind, an error is notified here, and when the water seal is broken due to the reverse wind, the water level is determined by the wind pressure of the exhaust fan. Detect and start burning for the time being, and drain water is replenished to the drain neutralization tank. After a certain period of time, the last water seal breakage is detected and the drain water is replenished successfully. Therefore, it is possible to continue combustion safely and use it with peace of mind.

この発明の一実施形態の潜熱回収型給湯機の概略構成図。1 is a schematic configuration diagram of a latent heat recovery type water heater according to an embodiment of the present invention. 同正面図。The front view. 同側面図。The same side view. 同正常常体を示すドレン中和槽の説明図。Explanatory drawing of the drain neutralization tank which shows the same normal body. 同ドレン水漏れで水封が破られた形態のドレン中和槽の説明図。Explanatory drawing of the drain neutralization tank of the form by which the water seal was broken by the drain water leak. 同ドレン水に逆風が作用している状態のドレン中和槽の説明図。Explanatory drawing of the drain neutralization tank of the state in which the back wind is acting on the drain water. 同ドレン水に逆風が作用した後の状態のドレン中和槽の説明図。Explanatory drawing of the drain neutralization tank of the state after a reverse wind acts on the drain water. 同ドレン水に排気ファンの送風圧を作用させて水封検知している状態のドレン中和槽の説明図。Explanatory drawing of the drain neutralization tank of the state which makes the ventilation pressure act on the drain water, and is detecting water seal. 同要部の電気回路のブロック図。The block diagram of the electric circuit of the principal part. 同要部のフローチャート。The flowchart of the principal part.

次にこの発明の一実施形態の潜熱回収型給湯機について図面に基づいて説明する。
１はこの実施形態の屋内設置タイプの器具本体、２は石油等を燃料とし下向きに火炎を発生する燃焼部であるバーナ、３はバーナ２に燃焼用の空気を供給すると共に、燃焼後の排気ガスを屋外に排気する排気ファン、４はバーナ２の下方に備えられた燃焼室、５は燃焼室４内に設けられバーナ２の燃焼に伴い発生する燃焼排気ガスの顕熱を回収するフィンチューブ式の熱交換器で構成された熱交換部としての一次熱交換部である。 Next, a latent heat recovery type water heater according to an embodiment of the present invention will be described with reference to the drawings.
1 is an indoor installation-type instrument body of this embodiment, 2 is a burner that is a combustion section that uses petroleum or the like as fuel to generate a downward flame, and 3 is supplied with combustion air to the burner 2 and exhausted after combustion. Exhaust fan for exhausting gas to the outside, 4 is a combustion chamber provided below the burner 2, 5 is a fin tube provided in the combustion chamber 4 for recovering sensible heat of combustion exhaust gas generated by the combustion of the burner 2 It is a primary heat exchange part as a heat exchange part comprised with the heat exchanger of a formula.

６は燃焼室４の下流側に配置され、燃焼室４の底部に一端を連通し、バーナ２で発生する排気ガスの排出に伴う騒音を低減させる消音装置で、消音装置６の他端は、ステンレス製の箱体で形成された熱交換部としての二次熱交換部７と排気ダクト８を介して連通しており、二次熱交換部７は潜熱を回収する熱交換器で構成され、消音装置６を通過した燃焼排ガスが露点以下になるまで熱交換させてドレンが生成される。また、９は二次熱交換部７を通過した排気ガスを器具本体１の屋外へ排出させ消音装置６、排気ダクト８に連通した排気経路である。   6 is a silencer disposed on the downstream side of the combustion chamber 4, one end of which communicates with the bottom of the combustion chamber 4 and reduces noise associated with exhaust gas exhaust generated in the burner 2. The other end of the silencer 6 is It communicates with the secondary heat exchanging part 7 as a heat exchanging part formed of a stainless steel box through the exhaust duct 8, and the secondary heat exchanging part 7 is composed of a heat exchanger that recovers latent heat, Heat is exchanged until the combustion exhaust gas that has passed through the silencer 6 is below the dew point, and drain is generated. Reference numeral 9 denotes an exhaust path that exhausts the exhaust gas that has passed through the secondary heat exchange unit 7 to the outside of the instrument body 1 and communicates with the silencer 6 and the exhaust duct 8.

１０は二次熱交換部７と連通し二次熱交換部７で生成されたドレンを一旦貯留するドレン中和槽で、上面中央には二次熱交換部７と連通しドレンが流入する流入口１１と、入り口側と出口側の２箇所に仕切壁１２を設けた内方には炭酸カルシウムからなる中和剤を充填し、流入口１１から流入される二次熱交換部７で発生した強酸性のドレンを貯留し中和して、一側壁の上部に形成された流出口１３から排水するものであり、底部には中のドレン水を全て排出可能の水抜き栓１４が設けられている。   Reference numeral 10 denotes a drain neutralization tank that communicates with the secondary heat exchange unit 7 and temporarily stores the drain generated in the secondary heat exchange unit 7. The drain is in communication with the secondary heat exchange unit 7 at the center of the upper surface. The inside of the inlet 11 and the partition wall 12 provided at two locations on the inlet side and the outlet side is filled with a neutralizing agent made of calcium carbonate, and is generated in the secondary heat exchange section 7 that flows in from the inlet 11 A strongly acidic drain is stored, neutralized, and drained from an outlet 13 formed at the top of one side wall, and a drain plug 14 is provided at the bottom to discharge all drain water therein. Yes.

又前記流出口１３からドレン中和槽１０の高さ以内の位置に設けられた器具本体１の排水口１５までの間を、該排水口１５に向かって徐々に登り傾斜した連通管１６で連通し、この連通管１６途中に一対の水位検知電極１７を備えたもので、連通管１６はドレン中和槽１０がドレンで満杯の通常時では、図４に示すようにドレン水が充満しており傾斜でドレン中和槽１０内に流出することはなく、水位検知電極１７は確実にドレン水有りを検知出来るものであるが、逆にドレン水が漏れた時には図５に示すように、連通管１６内のドレン水もドレン中和槽１０内に流出して空となり、水位検知電極１７がドレン水位が低下して水封が破れる前に、制御部１８を介してバーナ２の燃焼を停止及び、既に停止している時は燃焼開始しないように制御し、エラー報知するものである。
１９は中和剤投入口を塞ぐ投入口蓋である。 Further, a communication pipe 16 that gradually rises and inclines toward the drainage port 15 communicates from the outlet 13 to the drainage port 15 of the instrument body 1 provided at a position within the height of the drain neutralization tank 10. The communication pipe 16 is provided with a pair of water level detection electrodes 17 in the middle. When the drain neutralization tank 10 is full of drain, the communication pipe 16 is filled with drain water as shown in FIG. The drain level does not flow out into the drain neutralization tank 10 and the water level detection electrode 17 can reliably detect the presence of drain water. Conversely, when drain water leaks, as shown in FIG. The drain water in the pipe 16 also flows out into the drain neutralization tank 10 and becomes empty, and the combustion of the burner 2 is stopped via the control unit 18 before the water level detection electrode 17 is lowered and the water seal is broken. And if it has already stopped, do not start combustion. Then, it is to error notification.
Reference numeral 19 denotes an input port lid for closing the neutralizer input port.

更にドレン中和槽１０は排気経路９と連通している為に、図６に示すように強い逆風を受けた場合にその風圧が流入口１１側のドレン水の水面に作用して押し下げられることで、排水口１５からドレン水が押し出されるかたちで、排水されてドレン水が減少することにより、逆風が収まり風圧がなくなると図７に示すように水位検知電極１７部分にはドレン水がなくなり、水封状態は維持しているにも拘わらず、水封が破られていると検知して燃焼を停止及び、既に停止している時は燃焼開始しないように制御し、エラー報知するものであったので、図８に示すように熱要求発生時には先ず水位検知電極１７による水封破れを検知し、水封破れを検知した時には、逆風による水封破れを考慮して回転数を着火時より３０００ｒｐｍ上げて排気ファン３を駆動した状態で、再度水封を検知して燃焼開始に入るようにしたことにより、逆風による水封破れの誤検知が阻止され、通常通りの燃焼による給湯が良好に行われるようにしたものである。   Further, since the drain neutralization tank 10 communicates with the exhaust passage 9, when a strong back wind is received as shown in FIG. 6, the wind pressure acts on the water surface of the drain water on the inlet 11 side and is pushed down. In the form of drain water being pushed out from the drain port 15, drain water is reduced and the drain water is reduced. When the back wind is settled and the wind pressure disappears, the water level detection electrode 17 part has no drain water as shown in FIG. Although the water seal state is maintained, it is detected that the water seal is broken, and the combustion is stopped, and when it has already stopped, control is performed so that the combustion does not start, and an error is notified. Therefore, as shown in FIG. 8, when a heat request is generated, first, a water seal breakage by the water level detection electrode 17 is detected. When a water seal breakage is detected, the rotational speed is set to 3000 rpm from the time of ignition in consideration of the water seal breakage caused by the back wind. Raise and exhaust By detecting the water seal again and entering the start of combustion while the fan 3 is driven, erroneous detection of the water seal breakage due to the back wind is prevented, and hot water supply by normal combustion is performed satisfactorily. It is a thing.

２０は給水管、２１は出湯管、２２は給水管２０から分岐した給水バイパス管、２３は出湯管２１からの湯と給水バイパス管２２からの水とを混合し、その混合比を可変できる混合弁、２４は混合弁２３で混合された湯を給湯栓（図示せず）に給湯するための給湯管、２５は給水管２０に設けられ給水温度を検出する給水温度センサ、２６は給水管２０に設けられ流量を検出する流量センサ、２７は給湯管２４に設けられ給湯温度を検出する給湯温度センサである。   20 is a water supply pipe, 21 is a hot water supply pipe, 22 is a water supply bypass pipe branched from the water supply pipe 20, 23 is a mixture in which hot water from the hot water supply pipe 21 and water from the water supply bypass pipe 22 are mixed, and the mixing ratio can be varied. A valve 24, a hot water supply pipe for supplying hot water mixed by the mixing valve 23 to a hot water tap (not shown), 25 a water supply temperature sensor provided in the water supply pipe 20 for detecting a water supply temperature, and 26 a water supply pipe 20. A flow rate sensor 27 for detecting the flow rate is provided, and a hot water supply temperature sensor 27 is provided for the hot water supply pipe 24 to detect the hot water supply temperature.

２８は器具本体１内に内蔵され、マイクロコンピュータを主体としてこの器具本体１の各センサの信号を受け、各アクチュエータの駆動を制御する制御を行う前記制御部１８を有する電装基板であり、入力側には給水温度センサ２５や流量センサ２６や給湯温度センサ２７や水位検知電極１７が接続されており、出力側にはバーナ２や排気ファン３や混合弁２３がそれぞれ接続されている。   Reference numeral 28 denotes an electrical board that is built in the instrument main body 1 and has the control unit 18 that receives signals from the sensors of the instrument main body 1 and controls the driving of the actuators. A water supply temperature sensor 25, a flow rate sensor 26, a hot water supply temperature sensor 27, and a water level detection electrode 17 are connected to each other, and a burner 2, an exhaust fan 3, and a mixing valve 23 are connected to the output side.

次にこの一実施形態の作動について説明する。
今適宜箇所の給湯栓が開栓されて給湯が開始されると、この水の流れを流量センサ２６が検知し、バーナ２の燃焼を開始させる最低作動流量以上の流量になると、制御部１８は熱要求ありと判断し、バーナ２の燃焼を電磁ポンプ（図示せず）や点火器（図示せず）を駆動して開始させる。この燃焼により発生した燃焼排気ガスは一次熱交換部５に流入し、一次熱交換部５で給水と熱交換し、一次熱交換部５を通過した燃焼排気ガスは、消音装置６にて下向きから上向きにＵターンされ、排気ダクト８を介して二次熱交換部７に上向きに流入し、二次熱交換部７内に流入してくる給水と熱交換し、二次熱交換部７を通過した後、排気経路９から外部へ排出されるものである。 Next, the operation of this embodiment will be described.
When the hot water supply tap is opened at an appropriate location and the hot water supply is started, the flow rate sensor 26 detects the flow of this water, and when the flow rate is equal to or higher than the minimum operating flow rate at which the burner 2 starts to burn, the control unit 18 It is determined that there is a heat request, and combustion of the burner 2 is started by driving an electromagnetic pump (not shown) or an igniter (not shown). The combustion exhaust gas generated by this combustion flows into the primary heat exchange unit 5, exchanges heat with the feed water in the primary heat exchange unit 5, and the combustion exhaust gas that has passed through the primary heat exchange unit 5 passes downward from the silencer 6. It is U-turned upward, flows upward into the secondary heat exchange unit 7 via the exhaust duct 8, exchanges heat with the feed water flowing into the secondary heat exchange unit 7, and passes through the secondary heat exchange unit 7 After that, the gas is discharged from the exhaust path 9 to the outside.

この二次熱交換部７で温度上昇した温水は一次熱交換部５に流入し、ここでバーナ２の燃焼で発生した燃焼排気ガスとの熱交換で更に加熱されて、給湯として給湯栓から出湯されるものであり、この時、制御部１８は給湯温度センサ２７の検出する温度からユーザが設定した給湯設定温度になるようにバーナ２の燃焼量や混合弁２３の開度の調節するものである。   The hot water whose temperature has risen in the secondary heat exchanging section 7 flows into the primary heat exchanging section 5, where it is further heated by heat exchange with the combustion exhaust gas generated by the combustion of the burner 2, and discharged from the hot water tap as hot water. At this time, the control unit 18 adjusts the combustion amount of the burner 2 and the opening of the mixing valve 23 so that the temperature detected by the hot water temperature sensor 27 becomes the hot water temperature set by the user. is there.

又一次熱交換部５及び二次熱交換部７で給水と燃焼排気ガスが熱交換され、露点以下になることにより生成されたドレン水は、二次熱交換部７から流入口１１を介してドレン中和槽１０に貯留され、ドレン中和槽１０内に充填された中和剤により中和された後、流出口１３、連通管１６、排水口１５を介して器具本体１外へ排出されるものである。   The drain water generated by the heat exchange between the feed water and the combustion exhaust gas in the primary heat exchange unit 5 and the secondary heat exchange unit 7 and below the dew point is passed from the secondary heat exchange unit 7 through the inlet 11. After being stored in the drain neutralization tank 10 and neutralized by the neutralizing agent filled in the drain neutralization tank 10, it is discharged out of the instrument body 1 through the outlet 13, the communication pipe 16, and the drainage port 15. Is.

この時、ドレン中和槽１０内は図４に示す状態で、満杯状態であり流出口１３、連通管１６、排水口１５までドレン水が満杯で、これを越えると初めて該排水口１５からドレン水が排出されるものであり、連通管１６はドレン水で満たされているので、水位検知電極１７はドレン水を介して導通し該ドレン水有りで水封状態であることを検知し、制御部１８にこの信号を送るが異常状態ではないので、制御部１８はバーナ２の燃焼を停止したりせず又停止中では燃焼の開始を禁止したりもしないものである。   At this time, the inside of the drain neutralization tank 10 is full as shown in FIG. 4, and the drain water is full up to the outlet 13, the communication pipe 16 and the drain port 15. Since the water is discharged and the communication pipe 16 is filled with drain water, the water level detection electrode 17 conducts through the drain water and detects that the drain water is present and is in a water-sealed state. Although this signal is sent to the unit 18 but it is not in an abnormal state, the control unit 18 does not stop the combustion of the burner 2 and does not prohibit the start of combustion during the stop.

又この状態で水位検知電極１７の電圧印加による電気分解で発生する気体も、水位検知電極１７と排水口１５との高低差により、高い排水口１５に向かって流通して排出されるので、水位検知電極１７の周囲に残り腐蝕や劣化の原因になる心配もないものである。   In this state, the gas generated by electrolysis due to voltage application of the water level detection electrode 17 is also circulated and discharged toward the high drainage port 15 due to the difference in level between the water level detection electrode 17 and the drainage port 15. There is no concern about remaining corrosion around the detection electrode 17 or causing deterioration.

次に何らかの原因でドレン中和槽１０からドレン水が漏れた場合には、図５に示すような状態となり、ドレン中和槽１０内のドレン水位が低下することで、流出口１３、連通管１６、排水口１５内のドレン水もドレン中和槽１０内へ流れ出てなくなるので、水位検知電極１７はドレン水がなくなって導通せず、この信号が制御部１８に送られ該制御部１８では、バーナ２の燃焼を停止したり又停止中では燃焼の開始を禁止し、燃焼排気ガスがドレン中和槽１０から排水口１５を通り室内に放出されるのを未然に確実に防止して、安全と安心を確保するものであり、又このドレン水の漏れによる危険回避の燃焼停止であることをリモコンの表示部（図示せず）にエラー報知して、使用者に知らせるようにしても良いものである。   Next, when drain water leaks from the drain neutralization tank 10 for some reason, a state as shown in FIG. 5 is obtained, and the drain water level in the drain neutralization tank 10 is lowered, so that the outlet 13, the communication pipe 16. Since the drain water in the drain 15 does not flow out into the drain neutralization tank 10, the water level detection electrode 17 does not conduct because the drain water disappears, and this signal is sent to the control unit 18 and the control unit 18 The combustion of the burner 2 is stopped or the start of combustion is prohibited during the stop, and the combustion exhaust gas is surely prevented from being discharged from the drain neutralization tank 10 through the drain port 15 into the room, It is intended to ensure safety and security, and may notify the user by giving an error notification to the display unit (not shown) of the remote controller that the combustion is stopped to avoid danger due to leakage of this drain water. Is.

又器具本体１の設置当初は、ドレン中和槽１０にはドレン水が貯留されていないので排水口１５は水封されておらず、水位検知電極１７は導通状態でなく、制御部１８はバーナ２の燃焼を禁止状態としているので、設置業者はヤカン等によりドレン中和槽１０に水抜き栓１４或いは排水口１５から水を注水して水封することにより、水位検知電極１７を導通状態にすることで、初めて制御部１８によるバーナ２の燃焼が許可されるものである。   In addition, since drain water is not stored in the drain neutralization tank 10 at the beginning of installation of the instrument body 1, the drain port 15 is not sealed, the water level detection electrode 17 is not in a conductive state, and the control unit 18 is a burner. Since the combustion of No. 2 is prohibited, the installer puts the water level detection electrode 17 in a conductive state by pouring water from the drain plug 14 or the drain port 15 into the drain neutralization tank 10 with a kettle or the like and sealing the water. Thus, the combustion of the burner 2 by the control unit 18 is permitted for the first time.

次にドレン中和槽１０が通常状態である図４に示す満杯の状態で、燃焼停止している時に強い逆風を受けると、図６に示すようにその風圧が流入口１１側のドレン水の水面に作用して押し下げられることで、排水口１５からドレン水が押し出されるかたちで、排水されてドレン水が減少することにより、逆風が収まり風圧がなくなると図７に示すように水位検知電極１７部分にはドレン水がなくなり、水封状態は維持しているにも拘わらず、水封が破られていると検知して燃焼開始しないように制御するものであった。   Next, when the drain neutralization tank 10 is in a full state as shown in FIG. 4 and a strong back wind is received when the combustion is stopped, the wind pressure is reduced as shown in FIG. By acting on the water surface and being pushed down, drain water is pushed out from the drain port 15 and drained to reduce the drain water, so that when the back wind is settled and the wind pressure disappears, as shown in FIG. Although the drain water disappeared in the portion and the water seal state was maintained, it was detected that the water seal was broken and control was performed so as not to start combustion.

そこでこの発明では、図１０のフローチャートに示すように、給湯栓を開成した熱要求がありで、ステップＳ１に進みドレン中和槽１０の水位検知電極１７による水封ありを検知し、通常の場合はＹＥＳでステップＳ２に進んで燃焼開始し、そしてステップＳ３で水封ありを検知しながら燃焼を継続して、上記したように水漏れが発生したような時には、ＮＯとなってステップＳ４で燃焼を停止させると共に、燃焼の開始もさせずリモコンの表示部等にエラー報知するものである。   Therefore, in the present invention, as shown in the flowchart of FIG. 10, there is a heat request for opening the hot water tap, and the process proceeds to step S <b> 1 to detect the presence of water sealing by the water level detection electrode 17 of the drain neutralization tank 10. Is YES, proceeds to step S2, starts combustion, and continues to burn while detecting the presence of water seal in step S3. When a water leak occurs as described above, it becomes NO and burns in step S4. Is stopped and combustion is not started, and an error is notified to the display unit of the remote controller.

又ステップＳ１で強い逆風を受けドレン中和槽１０が図７のような状態となった場合は、水封が破られＮＯとなってステップＳ５に進んで、燃焼開始前に排気ファン３を着火回転数より３０００ｒｐｍ上げて駆動させ、これにより図８に示すように強制的にドレン中和槽１０の流入口１１側の水面を逆風時と同じように押し下げて、連通管１６にドレン水を充満させ、この状態でステップＳ６に進んで再度水位検知電極１７により水封ありを検知することで、水封ありとなってステップＳ７の燃焼開始となり、ここで排気ファン３通常の燃焼時の駆動に切換られ、そしてステップＳ８でこの燃焼が所定時間ここでは５分経過したか、即ち図７のドレン中和槽１０内のドレン水が減った状態から、燃焼が開始されて燃焼排気ガスとの熱交換が行われることで、ドレン水が発生しドレン中和槽１０内に該ドレン水が補給されるまでの時間が経過すると、最終の確認でステップＳ３に戻り再び水封ありを検知し、ドレン水の補給が確実に行われたかを確認し、ＹＥＳではステップＳ３で水封ありを検知しながら燃焼を継続し、ＮＯではステップＳ４で燃焼を停止させると共に、燃焼の開始もさせずリモコンの表示部等にエラー報知するものである。   If the drain neutralization tank 10 is in a state as shown in FIG. 7 due to strong backwind in step S1, the water seal is broken and the process proceeds to step S5 to ignite the exhaust fan 3 before starting combustion. As shown in FIG. 8, the water surface on the inlet 11 side of the drain neutralization tank 10 is forcibly pushed down in the same manner as in the reverse wind, and the communication pipe 16 is filled with drain water. In this state, the process proceeds to step S6, and the water level detection electrode 17 detects the presence of a water seal again, so that the water seal is detected and combustion starts in step S7. Here, the exhaust fan 3 is driven during normal combustion. In step S8, the combustion is started for a predetermined time, that is, 5 minutes here, that is, from the state where the drain water in the drain neutralization tank 10 in FIG. Exchange When the time until drain water is generated and the drain water is replenished in the drain neutralization tank 10 is reached, the process returns to step S3 in the final confirmation to detect the presence of a water seal again and replenish the drain water. In step S3, the combustion is continued while detecting the presence of a water seal. In NO, the combustion is stopped in step S4, and the combustion is not started and the start of the combustion is not started. This is an error notification.

一方ステップＳ６で逆風によるドレン水の減少でなく、水漏れ等の違う原因による水封の破れである場合には、ＮＯでステップＳ４に進んで燃焼を停止させると共に、燃焼の開始もさせずリモコンの表示部にエラー報知を行い使用者に知らせるものである。   On the other hand, if it is not the decrease of drain water due to the back wind in step S6 but the water seal is broken due to a different cause such as water leakage, the process proceeds to step S4 to stop the combustion, and the remote controller without starting the combustion. An error notification is made on the display unit to notify the user.

このように、熱要求発生時には先ず水位検知電極１７による水封破れを検知し、水封破れを検知した時には、逆風による水封破れを考慮して回転数を着火時より３０００ｒｐｍ上げて排気ファン３を駆動した状態で、再度水封を検知して燃焼開始に入るようにしたことにより、逆風による水封破れの誤検知が阻止され、通常通りの燃焼による給湯が良好に行われるようにしたものである。   In this way, when a heat request is generated, a water seal breakage by the water level detection electrode 17 is first detected, and when a water seal breakage is detected, the exhaust fan 3 is increased by rotating the rotational speed by 3000 rpm from the time of ignition in consideration of the water seal breakage caused by the back wind. Detecting a water seal again and starting combustion when it is driven, prevents erroneous detection of water seal breakage due to headwind and ensures that hot water supply is performed normally. It is.

更に逆風による水封破れでなく水漏れで水封破れした場合は、ここでエラー報知されて極めて安全であり、更に逆風による水封破れの時には排気ファン３の風圧で水位検知してひとまず燃焼開始し、ドレン水の補給をドレン中和槽１０に行うので、一定時間経過後には最後の水封破れ検知をして、このドレン水の補給が上手く行われたかの確認をすることで、安全に燃焼を継続出来て安心して使用することが出来るものである。   Furthermore, if the water breaks due to a water leak instead of a water break due to a reverse wind, an error is reported here and it is extremely safe. In the case of a water seal break due to a reverse wind, the water level is detected by the wind pressure of the exhaust fan 3 and combustion starts for the time being. Since the drain water is replenished to the drain neutralization tank 10, the final water seal breakage is detected after a certain period of time, and it is confirmed that this drain water has been replenished successfully. Can be used with peace of mind.

１ 器具本体
２ バーナ
３ 排気ファン
５ 一次熱交換部
７ 二次熱交換部
９ 排気経路
１０ ドレン中和槽
１１ 流入口
１３ 流出口
１４ 水抜き栓
１５ 排水口
１６ 連通管
１７ 水位検知電極
１８ 制御部 DESCRIPTION OF SYMBOLS 1 Apparatus main body 2 Burner 3 Exhaust fan 5 Primary heat exchange part 7 Secondary heat exchange part 9 Exhaust path 10 Drain neutralization tank 11 Inlet 13 Outlet 14 Drain plug 15 Drain outlet 16 Communication pipe 17 Water level detection electrode 18 Control part

Claims (2)

バーナの燃焼後の排気ガスが露点以下になることで発生するドレン水を、予め中和剤が充填されたドレン中和槽を流通させることで中和するものに於いて、前記ドレン中和槽には、上面に排気経路と連通しドレン水の入り口となる流入口と、一側壁上部には中和後のドレン水を流出させる流出口とを設け、この流出口近傍には一対の水位検知電極を備え、熱要求発生時水位検知電極によってドレン中和槽のドレン水位が低下しての水封破れを検知した時、排気ファンを駆動し再度水封破れを検知するようにした事を特徴とする潜熱回収型給湯機。   In the drain neutralization tank, the drain water generated when the exhaust gas after combustion of the burner falls below the dew point is neutralized by circulating a drain neutralization tank previously filled with a neutralizing agent. The upper surface has an inlet that communicates with the exhaust passage and serves as an inlet for drain water, and an outlet that discharges the neutralized drain water at the upper part of one side wall, and a pair of water level detections in the vicinity of the outlet. It is equipped with an electrode, and when a water level breakage due to a decrease in the drain water level in the drain neutralization tank is detected by the water level detection electrode when a heat request is generated, the exhaust fan is driven and the water level breakage is detected again. Latent heat recovery type water heater. 前記排気ファンの駆動しての再度の水封破れ検知で、水封破れを検知した時にはエラー報知し、水封なしの場合には、燃焼開始してから一定時間経過後、再び水封検知を行う事を特徴とする請求項１記載の潜熱回収型給湯機。   When a water seal breakage is detected again by driving the exhaust fan, an error is notified when a water seal breakage is detected, and when there is no water seal, a water seal is detected again after a certain period of time has elapsed since the start of combustion. The latent heat recovery type water heater according to claim 1, wherein the latent heat recovery type water heater is performed.
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