JP2019203612A

JP2019203612A - Indoor installation type water heater

Info

Publication number: JP2019203612A
Application number: JP2018096970A
Authority: JP
Inventors: 谷村　愛隆; Yoshitaka Tanimura; 愛隆谷村
Original assignee: Harman Co Ltd
Current assignee: Harman Co Ltd
Priority date: 2018-05-21
Filing date: 2018-05-21
Publication date: 2019-11-28

Abstract

To provide an indoor installation type water heater which is capable of suppressing a state where interlock means inhibits use of an instrument and of which the user friendliness is improved, by issuing a previous notice about the detection of occurrence of exhaust blockage (imperfect combustion) in a heat exchanger.SOLUTION: In an indoor installation type water heater, in order to determine an exhaust blockage state of a heat exchanger, when a second detection value (an ambient temperature of the heat exchanger) detected and outputted by a second temperature detection section becomes higher than a predetermined threshold for exhaust blockage detection, the exhaust blockage state of the heat exchanger is determined and combustion of a burner is stopped. When the number of times of determining the exhaust blockage state and stopping the combustion of a burner 3 reaches a predetermined number of times, until a predetermined reset operation is performed, the combustion of the burner is not started even if an ignition operation is performed. The indoor installation type water heater comprises a notification section by which, when the second detection value indicates a predetermined increase property in a state where the second detection value is lower than or equal to the predetermined threshold for exhaust blockage detection, a notification calling cleaning of the heat exchanger is performed.SELECTED DRAWING: Figure 4

Description

本発明は給湯装置に関し、詳しくは、屋内に設置して用いられる屋内設置型給湯装置に関する。 The present invention relates to a hot water supply apparatus, and more particularly to an indoor installation type hot water supply apparatus that is used indoors.

不完全燃焼が生じた場合に、それを検出して燃焼を停止するように構成された燃焼制御装置を有する屋内設置型給湯装置が広く知られている。 2. Description of the Related Art An indoor hot water supply apparatus having a combustion control device configured to detect combustion when incomplete combustion occurs and stop combustion is widely known.

そして、そのような屋内設置型給湯装置として、特許文献１には、器具の燃焼状態の異常を監視する監視手段と、その監視手段による所定の監視結果に基づいて器具の使用を禁止可能なインターロック手段とを備えた開放型ガス燃焼器具（屋内設置型給湯装置）であって、インターロック手段の作動情報を電源の中断に拘わらず保存可能な記憶手段を設けて、電源の復帰の際には記憶手段に保存された作動情報に基づいてインターロック手段が器具の使用禁止を続行可能としたことを特徴とする開放型ガス燃焼器具（屋内設置型給湯装置）が開示されている。 As such an indoor-installed hot water supply apparatus, Patent Document 1 discloses a monitoring unit that monitors an abnormality in the combustion state of an appliance and an interface that can prohibit the use of the appliance based on a predetermined monitoring result by the monitoring unit. An open type gas combustion appliance (indoor installation type hot water supply device) provided with a lock means, provided with a storage means capable of storing the operation information of the interlock means regardless of the interruption of the power supply, and at the time of returning the power supply Discloses an open type gas combustion appliance (indoor installation type hot water supply device) characterized in that the interlock means can continue to prohibit the use of the appliance based on the operation information stored in the storage means.

この特許文献１の開放型ガス燃焼器具（屋内設置型給湯装置）によれば、電源が中断した場合にも、インターロックを確実に実行することが可能になり、信頼性を向上させることができて有意義である。 According to the open-type gas combustion appliance (indoor installation type hot water supply device) of Patent Document 1, even when the power supply is interrupted, the interlock can be reliably executed, and the reliability can be improved. Is meaningful.

特開２０００−２５７８５８号公報JP 2000-257858 A

しかしながら、特許文献１の開放型ガス燃焼器具（屋内設置型給湯装置）の場合、燃焼状態の異常の発生回数が所定回数に達すると、インターロック手段が器具の使用を禁止してしまい、特別なリセット操作を行わない限り、給湯装置（器具）の使用が禁止された状態が続行するため不便である。 However, in the case of the open type gas combustion appliance (indoor installation type hot water supply device) of Patent Document 1, when the number of occurrences of the abnormality of the combustion state reaches a predetermined number, the interlock means prohibits the use of the appliance, and a special Unless the reset operation is performed, it is inconvenient because the state where the use of the hot water supply device (appliance) is prohibited continues.

ところで、特許文献１の発明における燃焼状態の異常の発生とは、いわゆる不完全燃焼の発生であり、不完全燃焼の発生を検出し、その回数が所定回数に達すると、インターロック手段が給湯装置の使用を禁止するものである。 Incidentally, the occurrence of abnormality in the combustion state in the invention of Patent Document 1 refers to the occurrence of so-called incomplete combustion. When the occurrence of incomplete combustion is detected and the number of times reaches a predetermined number, the interlock means turns into the hot water supply device. Is prohibited.

そして、特許文献１の開放型ガス燃焼器具（屋内設置型給湯装置）の場合、不完全燃焼の発生の検出は、特に予告を伴うことなく行われるので、給湯装置の使用者は、通常、点火操作を繰り返して行う（試みる）ことが考えられる。 In the case of the open-type gas combustion appliance (indoor installation type hot water supply device) of Patent Document 1, the detection of the occurrence of incomplete combustion is performed without any particular notice, so that the user of the hot water supply device usually performs ignition. It is conceivable to repeat (try) the operation.

そのため、燃焼状態の異常の発生回数が所定回数に達して、インターロック手段が給湯装置の使用を禁止する状態に至る蓋然性が高くなり、インターロックがかかると器具の使用ができなくなり不便である。 Therefore, the probability that the number of occurrences of the abnormality in the combustion state reaches a predetermined number and the interlock means prohibits the use of the hot water supply device is increased, and if the interlock is applied, the appliance cannot be used, which is inconvenient.

本発明は、上記の課題を解決するものであり、熱交換器の排気閉塞（不完全燃焼）の発生が検出される前にその予告が行われることで、インターロック手段が器具の使用を禁止する状態に至ることが抑制されるようにした、使い勝手のよい屋内設置型給湯装置を提供することを目的とする。 The present invention solves the above-mentioned problem, and the interlock means prohibits the use of the appliance by providing a notice before the occurrence of exhaust blockage (incomplete combustion) of the heat exchanger is detected. An object of the present invention is to provide an easy-to-use indoor installation type hot water supply apparatus that is suppressed from reaching the state of being performed.

上記の目的を達成するために、本発明の屋内設置型給湯装置は、
点火操作により燃焼を開始するバーナと、
前記バーナの燃焼炎により加熱される熱交換器と、
前記バーナの燃焼炎の温度を検出して第１検出値として出力する第１温度検出部と、
前記バーナの燃焼炎により加熱される前記熱交換器の周囲温度を検出し、その検出値を前記熱交換器の排気通路が狭くなって排気ガスが流れにくくなる排気閉塞状態の発生の有無を判断するための第２検出値として出力する第２温度検出部と、
前記第２検出値に基づいて前記バーナの燃焼を制御するコントローラと、を備え、
前記第２検出値が、前記熱交換器の排気閉塞状態を検出するための所定の排気閉塞検出用閾値より高くなったときに、前記コントローラが前記熱交換器の排気閉塞状態であると判断して前記バーナの燃焼を停止するとともに、
前記コントローラが前記熱交換器の排気閉塞状態であると判断して前記バーナの燃焼を停止した回数が所定の回数に達したときには、前記コントローラに対して所定のリセット操作が行われるまで、前記点火操作がなされても前記バーナの燃焼を開始しないように構成された屋内設置型給湯装置であって、
前記第２検出値が前記所定の排気閉塞検出用閾値以下の状態で、前記第２検出値が所定の増加特性を示したとき、前記熱交換器の清掃を促す旨の報知を行う報知部を備えていること
を特徴としている。 In order to achieve the above object, the indoor installation type hot water supply apparatus of the present invention is:
A burner that starts combustion by ignition operation;
A heat exchanger heated by a combustion flame of the burner;
A first temperature detector for detecting the temperature of the combustion flame of the burner and outputting it as a first detection value;
The ambient temperature of the heat exchanger heated by the combustion flame of the burner is detected, and the detected value is determined whether or not an exhaust blockage state occurs in which the exhaust passage of the heat exchanger becomes narrow and the exhaust gas hardly flows. A second temperature detection unit that outputs a second detection value for
A controller for controlling combustion of the burner based on the second detection value,
When the second detection value is higher than a predetermined exhaust blockage detection threshold for detecting the exhaust blockage state of the heat exchanger, the controller determines that the heat exchanger is in an exhaust blockage state. The combustion of the burner is stopped,
When the controller determines that the heat exchanger is in an exhaust blockage state and the number of times the combustion of the burner has stopped reaches a predetermined number of times, the ignition is continued until a predetermined reset operation is performed on the controller. An indoor installation type hot water supply device configured not to start combustion of the burner even if an operation is performed,
An informing unit for informing that cleaning of the heat exchanger is promoted when the second detection value indicates a predetermined increase characteristic in a state where the second detection value is equal to or less than the predetermined exhaust gas blockage detection threshold; It is characterized by having.

本発明の屋内設置型給湯装置においては、
前記コントローラが、前記バーナの燃焼開始後、所定第１時間経過時点の前記第２検出値、および、前記バーナの燃焼開始後、前記所定第１時間より長い所定第２時間経過時点の前記第２検出値を記憶する記憶部を備え、
前記所定第２時間経過時点の前記第２検出値が、前記所定第１時間経過時点の前記第２検出値より大きい値となったときに、前記第２検出値が前記所定の増加特性を示したと判断するように構成されていること
が好ましい。 In the indoor installation type hot water supply apparatus of the present invention,
The controller detects the second detection value when a predetermined first time elapses after the start of combustion of the burner, and the second detection time elapses after a predetermined second time longer than the predetermined first time after the burner starts combustion. A storage unit for storing the detected value;
When the second detection value when the predetermined second time elapses becomes larger than the second detection value when the predetermined first time elapses, the second detection value exhibits the predetermined increase characteristic. It is preferable that it is configured so as to be judged.

また、前記コントローラが、前記熱交換器の排気閉塞状態であると判断して前記バーナの燃焼を停止したときに報知を行う燃焼停止時報知部を備えているとともに、
前記燃焼停止時報知部が、前記熱交換器の清掃を促す旨の報知を行う前記報知部としても用いられており、
前記燃焼停止時報知部による前記熱交換器の清掃を促す旨の報知が、前記バーナの燃焼を停止したときの報知とは異なる態様で行われるように構成されていること
が好ましい。 In addition, the controller includes a combustion stop notification unit that performs notification when the burner is stopped by determining that the heat exchanger is in an exhaust blockage state,
The notification unit when the combustion is stopped is also used as the notification unit that notifies that the heat exchanger is to be cleaned,
It is preferable that the notification that the cleaning of the heat exchanger is promoted by the notification unit when the combustion is stopped is performed in a manner different from the notification when the combustion of the burner is stopped.

本発明の屋内設置型給湯装置は、上述のように構成されており、第２温度検出部の検出値（第２検出値）が所定の排気閉塞検出用閾値以下の状態で、第２検出値が所定の増加特性を示したとき、熱交換器の清掃を促す旨の報知を行う報知部を備えているので、熱交換器が排気閉塞状態に至ったことが検出されてバーナの燃焼が停止される前に報知が行われることになる。 The indoor-installed hot water supply apparatus of the present invention is configured as described above, and the second detection value is obtained when the detection value (second detection value) of the second temperature detection unit is equal to or lower than a predetermined exhaust blockage detection threshold. When it shows a predetermined increase characteristic, it is provided with a notification unit for notifying that the heat exchanger is to be cleaned, so that it is detected that the heat exchanger has reached the exhaust blockage state, and combustion of the burner is stopped. Notification will be made before it is made.

その結果、熱交換器が閉塞状態であると判断されてバーナの燃焼が停止されることが繰り返され、バーナの燃焼停止の回数が所定の回数に達して、点火操作がなされてもバーナが燃焼を開始しない状態（給湯装置の使用が禁止された状態）に至ることを抑制、防止することが可能になる。 As a result, it is repeatedly determined that the heat exchanger is closed and combustion of the burner is stopped, and the burner burns even when the ignition operation is performed when the number of burner combustion stops reaches a predetermined number. Can be suppressed and prevented from reaching a state in which the hot water supply apparatus is not started (a state where use of the hot water supply apparatus is prohibited).

上述のように、本発明によれば、バーナの燃焼を停止した回数が所定の回数に達し、特にリセット操作が行われるまではバーナが燃焼を開始しない、という不便な状態に至ることを抑制、回避することが可能で、使い勝手のよい屋内設置型給湯装置を実現することができる。 As described above, according to the present invention, the number of times the combustion of the burner is stopped reaches a predetermined number, and in particular, it is suppressed that the burner does not start combustion until the reset operation is performed. An indoor installation type hot water supply apparatus that can be avoided and is easy to use can be realized.

また、コントローラが、バーナの燃焼開始後、所定第１時間経過時点の第２温度検出部の検出値（第２検出値）、および、バーナの燃焼開始後、所定第１時間より長い所定第２時間経過時点の第２検出値を記憶する記憶部を備え、所定第２時間経過時点の第２検出値が、所定第１時間経過時点の第２検出値より大きい値となったときに、第２検出値が所定の増加特性を示したと判断するように構成した場合、バーナの燃焼開始後、所定第１時間経過時点の第２検出値と、所定第１時間より長い所定第２時間経過時点の第２検出値によって、第２温度検出部の検出値（第２検出値）が所定の増加特性を示すこと簡単に、しかも、適正に判定することが可能になり、本発明をより実効あらしめることができる。 Further, the controller detects a detected value (second detected value) of the second temperature detector when a predetermined first time has elapsed after the start of combustion of the burner, and a predetermined second longer than the predetermined first time after the start of combustion of the burner. A storage unit is provided for storing a second detection value at the elapse of time, and when the second detection value at the elapse of the predetermined second time becomes larger than the second detection value at the elapse of the predetermined first time, 2 When the detection value is determined to exhibit a predetermined increase characteristic, the second detection value at the time when the predetermined first time has elapsed after the start of combustion of the burner and the time at which the predetermined second time has elapsed that is longer than the predetermined first time With this second detection value, the detection value (second detection value) of the second temperature detection unit can exhibit a predetermined increase characteristic easily and appropriately, and the present invention is more effective. It can be tightened.

また、コントローラが、熱交換器の排気閉塞状態であると判断してバーナの燃焼を停止したときに報知を行う燃焼停止時報知部を備えているとともに、燃焼停止時報知部が、熱交換器の清掃を促す旨の報知を行う報知部としても用いられており、燃焼停止時報知部による熱交換器の清掃を促す旨の報知が、バーナの燃焼を停止したときの報知とは異なる態様で行われるように構成した場合、必要な報知機能を確保しつつ、燃焼停止時報知部を、熱交換器の清掃を促す旨の報知を行う報知部としても用いる（共用する）ことが可能になり、部品点数を少なくして製造コストを低減することができる。 In addition, the controller includes a combustion stop notification unit that notifies when the controller determines that the heat exchanger is in an exhaust blockage state and stops combustion of the burner. It is also used as a notification unit that notifies that the cleaning of the heat exchanger is promoted, and the notification that prompts the cleaning of the heat exchanger by the notification unit at the time of combustion stop is different from the notification when the combustion of the burner is stopped. When configured to be performed, it is possible to use (share) the notification unit at the time of combustion stop as a notification unit that notifies that the heat exchanger is to be cleaned while securing a necessary notification function. The number of parts can be reduced and the manufacturing cost can be reduced.

本発明の実施形態にかかる屋内設置型給湯装置の全体構成図である。It is a whole block diagram of the indoor installation type hot-water supply apparatus concerning embodiment of this invention. 図１の屋内設置型給湯装置の制御ブロック図である。It is a control block diagram of the indoor installation type hot water supply apparatus of FIG. 図１の屋内設置型給湯装置のバーナの加熱量が大火力の場合の第２酸欠基準、および、第１温度検出部（第１熱電対）、第２温度検出部（第２熱電対）の起電力の変化の一例を示す特性図である。The second oxygen deficiency standard, the first temperature detection unit (first thermocouple), the second temperature detection unit (second thermocouple) when the heating amount of the burner of the indoor hot water supply apparatus of FIG. 1 is large thermal power It is a characteristic view which shows an example of the change of the electromotive force of. 図１の屋内設置型給湯装置のバーナの加熱量が小火力の場合の第２酸欠基準、および、第１温度検出部（第１熱電対）、第２温度検出部（第２熱電対）の起電力の変化の一例を示す特性図である。The second oxygen deficiency standard when the heating amount of the burner of the indoor hot water supply apparatus of FIG. 1 is small thermal power, the first temperature detection unit (first thermocouple), the second temperature detection unit (second thermocouple) It is a characteristic view which shows an example of the change of the electromotive force of. 本発明の実施形態にかかる屋内設置型給湯装置において、バーナに酸欠燃焼の兆候が表れたときの第１温度検出部（第１熱電対）の起電力、第２温度検出部（第２熱電対）の起電力、および、燃焼排ガス中の一酸化炭素（ＣＯ）濃度の関係を示す図である。In the indoor hot water supply apparatus according to the embodiment of the present invention, the electromotive force of the first temperature detector (first thermocouple) when the sign of oxygen deficient combustion appears in the burner, the second temperature detector (second thermoelectric) It is a figure which shows the relationship between the electromotive force of a pair) and the carbon monoxide (CO) density | concentration in combustion exhaust gas.

以下、本発明の実施形態を示して、その特徴とするところを詳しく説明する。 Hereinafter, an embodiment of the present invention will be shown and features thereof will be described in detail.

［実施形態］
図１は本発明の実施形態にかかる屋内設置型給湯装置（以下、単に「給湯装置」ともいう）の全体構成図である。
この給湯装置は、燃焼室Ｒを構成するための筒胴１を備え、この筒胴１の内側上端部には、フィンチューブ型の水加熱用の熱交換器２が設けられている。また、筒胴１の下方には熱交換器２を加熱するバーナ３が設けられている。 [Embodiment]
FIG. 1 is an overall configuration diagram of an indoor installation type hot water supply apparatus (hereinafter also simply referred to as “hot water supply apparatus”) according to an embodiment of the present invention.
This hot water supply apparatus includes a cylinder body 1 for constituting a combustion chamber R, and a fin tube type heat exchanger 2 for water heating is provided at an inner upper end portion of the cylinder body 1. A burner 3 for heating the heat exchanger 2 is provided below the cylinder 1.

さらに、熱交換器２への給水路Ｗｉには、止水弁４、水圧変化に応動して給水量を調整する水ガバナ５、および分流弁６が順次配設されている。一方、熱交換器２からの出湯路Ｗｏには、フレキシブル管７を介して出湯具８が接続されている。そして、上記の分流弁６と出湯路Ｗｏとの間にはバイパス路Ｗｂが設けられ、分流弁６の開度により、給水路Ｗｉから出湯路Ｗｏへバイパス路Ｗｂを介して分流供給されるバイパス水量の割合が調整されるように構成されている。 Further, in the water supply channel Wi to the heat exchanger 2, a water stop valve 4, a water governor 5 that adjusts a water supply amount in response to a change in water pressure, and a diversion valve 6 are sequentially arranged. On the other hand, a hot water outlet 8 is connected to a hot water path Wo from the heat exchanger 2 via a flexible pipe 7. A bypass path Wb is provided between the diversion valve 6 and the outlet hot water path Wo, and the bypass is supplied from the water supply path Wi to the outlet hot water path Wo through the bypass path Wb according to the opening of the diversion valve 6. It is comprised so that the ratio of the amount of water may be adjusted.

また、バーナ３へのガス供給路Ｇには、遮断弁９、水圧応動弁１０、ガスガバナ１１、および燃料ガス供給量を調整する調整弁１２が順次介装されている。 Further, a shutoff valve 9, a water pressure responsive valve 10, a gas governor 11, and an adjustment valve 12 for adjusting the fuel gas supply amount are sequentially provided in the gas supply path G to the burner 3.

そして、この給湯装置においては、水圧応動弁１０は、連動杆１０ａを介して水ガバナ５との連動により給水状態でのみ弁が開くように構成されており、また、ガスガバナ１１は、燃料ガス供給の元圧変化に応動してバーナ３への燃料ガス供給圧を適正圧に保つように構成されている。 In this hot water supply apparatus, the water pressure responsive valve 10 is configured to open only in a water supply state by interlocking with the water governor 5 via the interlocking rod 10a, and the gas governor 11 is configured to supply fuel gas. The fuel gas supply pressure to the burner 3 is maintained at an appropriate pressure in response to the original pressure change.

さらに、この給湯装置においては、バーナ３に近接して点火プラグ１６が設けられ、バーナ３の燃焼炎に接触するように第１熱電対１７が配設されている。また、燃焼室Ｒを構成する筒胴１に形成した測温用開口１ａには、感熱部が臨む状態で第２熱電対２１が配設されている。 Furthermore, in this hot water supply apparatus, a spark plug 16 is provided in the vicinity of the burner 3, and a first thermocouple 17 is disposed so as to contact the combustion flame of the burner 3. In addition, a second thermocouple 21 is disposed in the temperature measuring opening 1a formed in the cylinder body 1 constituting the combustion chamber R in a state where the heat sensitive part faces.

そして、上記の第１熱電対１７が、本発明におけるバーナの燃焼炎の温度を検出し、第１検出値として出力する第１温度検出部である。
なお、第２熱電対２１は、第２温度検出部として、バーナ３により加熱される熱交換器２の周囲温度を検出するために配設されており、その検出値を熱交換器２の排気通路が狭くなって排気ガスが流れにくくなる排気閉塞状態の発生の有無を判断するための第２検出値として出力する。 And said 1st thermocouple 17 is a 1st temperature detection part which detects the temperature of the combustion flame of the burner in this invention, and outputs it as a 1st detection value.
The second thermocouple 21 is provided as a second temperature detection unit for detecting the ambient temperature of the heat exchanger 2 heated by the burner 3, and the detected value is used as the exhaust of the heat exchanger 2. This is output as a second detection value for determining whether or not an exhaust blockage state in which the passage becomes narrow and the exhaust gas does not flow easily.

第１温度検出部である第１熱電対１７は、金属製の熱電対取付板を用いて感熱部を正常燃焼状態の燃焼炎の内部に位置するように配設されているとともに、そのプラス側が熱電対取付板と電気的に接続して設けられており、バーナ３の燃焼炎の温度に応じた起電力を第１検出値として出力する。 The first thermocouple 17 serving as the first temperature detecting unit is disposed so that the heat-sensitive unit is positioned inside the combustion flame in a normal combustion state using a metal thermocouple mounting plate, and the positive side thereof is It is provided in electrical connection with the thermocouple mounting plate, and outputs an electromotive force according to the temperature of the combustion flame of the burner 3 as a first detection value.

また、第２温度検出部である第２熱電対２１は、そのプラス側が筒胴１と電気的に接続して設けられており、バーナ３から熱交換器２を通過する筒胴１内の燃焼ガスの排気通路が狭くなって排気閉塞状態が発生したときには、筒胴１の測温用開口１ａから高温の燃焼ガスが流出するので、そのときに流出した燃焼ガスの温度に応じた起電力を第２検出値として出力する。 Further, the second thermocouple 21 as the second temperature detection unit is provided with its positive side electrically connected to the cylinder body 1, and combustion in the cylinder body 1 passing through the heat exchanger 2 from the burner 3. When the exhaust passage of the gas becomes narrow and an exhaust blockage state occurs, high-temperature combustion gas flows out from the temperature measurement opening 1a of the cylinder 1 so that an electromotive force corresponding to the temperature of the combustion gas flowing out at that time is generated. Output as the second detection value.

そして、図２に示すように、第１熱電対１７のマイナス端子を後述するコントローラＣの入力端子ｃに接続し、第１熱電対１７のプラス端子をコントローラＣの入力端子ａに接続している。また、第２熱電対２１のマイナス端子をコントローラＣの入力端子ｂに接続し、第２熱電対２１のプラス端子をコントローラＣの入力端子ａに接続している。ここで、コントローラＣの入力端子ａは接地されている。以上のように、コントローラＣの入力端子ａ−ｃ間にはバーナ３の燃焼炎の温度に応じた起電力が端子ａ側をプラスとして入力され、コントローラＣの入力端子ａ−ｂ間にはバーナ３から熱交換器２を通過する筒胴１内の燃焼ガスの排気通路が狭くなって排気閉塞状態が発生したときに流出した燃焼ガスの温度に応じた起電力が端子ａ側をプラスとして入力されるように構成している。 As shown in FIG. 2, the minus terminal of the first thermocouple 17 is connected to the input terminal c of the controller C described later, and the plus terminal of the first thermocouple 17 is connected to the input terminal a of the controller C. . The minus terminal of the second thermocouple 21 is connected to the input terminal b of the controller C, and the plus terminal of the second thermocouple 21 is connected to the input terminal a of the controller C. Here, the input terminal a of the controller C is grounded. As described above, the electromotive force corresponding to the temperature of the combustion flame of the burner 3 is input between the input terminals a and c of the controller C with the terminal a side being positive, and the burner is input between the input terminals a and b of the controller C. The electromotive force corresponding to the temperature of the combustion gas flowing out when the exhaust passage of the combustion gas in the cylinder body 1 passing through the heat exchanger 2 from 3 is narrowed and the exhaust blockage state occurs is input with the terminal a side as a plus It is configured to be.

さらに、バーナ３に対向するガスノズル１８の下方近傍の位置にはノズル近傍用温度ヒューズ１９が、また、筒胴１の外周部の背面側（給湯装置を壁面に設置する場合は、壁面側）近傍に筒胴用温度ヒューズ２０が、それぞれ配設されている。 Further, a temperature fuse 19 for the vicinity of the nozzle is located at a position near the lower side of the gas nozzle 18 facing the burner 3, and the back side of the outer peripheral portion of the cylinder body 1 (the wall surface side when the hot water supply device is installed on the wall surface). The cylinder body temperature fuses 20 are respectively provided.

ノズル近傍用温度ヒューズ１９は、ガスノズル１８の近傍の温度が異常高温になると溶断するものであり、また、筒胴用温度ヒューズ２０は、筒胴１の上部外周近傍の温度が異常高温になると溶断するものであって、両ヒューズ１９、２０はそれぞれ同様の構成のものである。そして、特に図示しないが、両ヒューズ１９、２０は、リード線を接続したヒューズ素子が、可撓性および耐熱性を有するチューブ内に直列に挿入され、チューブの外周の２箇所をバインダで束縛することによりチューブ内に固定された構成を有している。 The temperature fuse 19 near the nozzle is blown when the temperature near the gas nozzle 18 becomes abnormally high, and the temperature fuse 20 for cylinder is blown when the temperature near the upper outer periphery of the cylinder 1 becomes abnormally high. The fuses 19 and 20 have the same configuration. Although not shown in particular, the fuses 19 and 20 have fuse elements connected to lead wires inserted in series in a tube having flexibility and heat resistance, and two places on the outer periphery of the tube are bound by a binder. This has a configuration fixed in the tube.

また、給湯装置は、制御手段としてのコントローラＣを備えている。このコントローラＣは、マイクロコンピュータを有し、所定の制御プログラムをインストールすることにより、第１熱電対１７、第２熱電対２１、操作マイクロスイッチ１４、水圧マイクロスイッチ１５などからの出力に基づいてバーナ３の燃焼制御や各部の動作を制御するように構成されている。そして、このコントローラＣには、図２に示すように、動作電源として乾電池Ｂｔから電力が供給され、乾電池Ｂｔを取り外さない限り電力供給が継続される。 In addition, the hot water supply apparatus includes a controller C as a control means. This controller C has a microcomputer, and installs a predetermined control program, so that the burner is based on outputs from the first thermocouple 17, the second thermocouple 21, the operation micro switch 14, the water pressure micro switch 15, and the like. 3 is configured to control the combustion control of 3 and the operation of each part. As shown in FIG. 2, the controller C is supplied with electric power from the dry battery Bt as an operating power supply, and the electric power supply is continued unless the dry battery Bt is removed.

また、この給湯装置は、後述のように燃焼状態の異常により燃焼禁止状態になっていることを報知するための、ＬＥＤを用いた異常報知ランプ（報知部）２２（図２）を備えている。 In addition, the hot water supply device includes an abnormality notification lamp (notification unit) 22 (FIG. 2) using an LED for notifying that the combustion is prohibited due to an abnormality in the combustion state as described later. .

次に、給湯装置が正常燃焼する場合における給湯時および給湯停止時のコントローラＣの制御動作について説明する。 Next, the control operation of the controller C during hot water supply and when hot water supply is stopped when the hot water supply device normally burns will be described.

給湯を開始する場合には、押しボタン式の出湯操作具１３（図１）を押す。出湯操作具１３が押されると、これに応じて操作マイクロスイッチ１４がオンになり、同時に、出湯操作具１３の押し操作に連動して止水弁４が開弁される。止水弁４が開弁されると、水が水ガバナ５に入り、水圧により連動杆１０ａが水圧応動弁１０を開弁する方向に応動して水圧マイクロスイッチ１５がオンになる。 When hot water supply is started, the push button type hot water operation tool 13 (FIG. 1) is pushed. When the hot water operation tool 13 is pushed, the operation micro switch 14 is turned on accordingly, and at the same time, the water stop valve 4 is opened in conjunction with the push operation of the hot water operation tool 13. When the water stop valve 4 is opened, water enters the water governor 5, and the water pressure microswitch 15 is turned on in response to the direction of the interlocking rod 10 a opening the water pressure responsive valve 10 due to the water pressure.

操作マイクロスイッチ１４および水圧マイクロスイッチ１５がともにオンになると、これに応じてコントローラＣは、点火プラグ１６をスパークさせるとともに、遮断弁９のコイル９ａに吸着電流を流すので、遮断弁９が開弁される。 When both the operation micro switch 14 and the water pressure micro switch 15 are turned on, the controller C causes the spark plug 16 to spark in response to this and causes an adsorption current to flow through the coil 9a of the shut-off valve 9, so that the shut-off valve 9 opens. Is done.

これにより、燃料ガスは、遮断弁９、連動杆１０ａにより開弁された水圧応動弁１０、ガスガバナ１１、および調整弁１２を順次通過してバーナ３に供給され、点火プラグ１６のスパークにより点火されて燃焼する。 As a result, the fuel gas is sequentially supplied to the burner 3 through the shutoff valve 9, the water pressure responsive valve 10 opened by the interlocking rod 10 a, the gas governor 11, and the regulating valve 12, and is ignited by the spark of the spark plug 16. And burn.

第１熱電対１７は、バーナ３の燃焼炎に接触する状態で配置されているので、バーナ３が正常に燃焼している限り、燃焼炎により加熱された第１熱電対１７の起電力に応じた温度がコントローラＣに予め設定された着火検出用の基準値以上となるため、コントローラＣからは遮断弁９のコイル９ａに吸着電流が供給され続ける結果、遮断弁９の開弁状態が継続する。 Since the 1st thermocouple 17 is arrange | positioned in the state which contacts the combustion flame of the burner 3, as long as the burner 3 is burning normally, according to the electromotive force of the 1st thermocouple 17 heated by the combustion flame As a result, the controller C continues to supply an adsorption current to the coil 9a of the shutoff valve 9, so that the open state of the shutoff valve 9 continues. .

一方、水は、止水弁４、水ガバナ５および分流弁６を通過して熱交換器２に流れると同時に、バイパス路Ｗｂを経由して出湯路Ｗｏに流れる。そして、熱交換器２からの湯とバイパス路Ｗｂからの水とが混合されて適温となった湯が出湯具８から出湯される。 On the other hand, the water passes through the water stop valve 4, the water governor 5, and the diversion valve 6 and flows into the heat exchanger 2 and simultaneously flows into the hot water outlet Wo through the bypass path Wb. Then, the hot water from which the hot water from the heat exchanger 2 and the water from the bypass passage Wb are mixed to reach an appropriate temperature is discharged from the hot water outlet 8.

このような給湯状態において、給湯を停止したい場合には、出湯操作具１３を再び押すと、その押し操作に連動して操作マイクロスイッチ１４がオフになるとともに、止水弁４が閉弁して給水が停止され、結果的に出湯も停止される。また、止水弁４が閉弁すると、水ガバナ５は水圧差がなくなるので、連動杆１０ａが水圧応動弁１０を閉弁する方向に応動するため、水圧応動弁１０が閉弁されるとともに、水圧マイクロスイッチ１５がオフになる。そして、コントローラＣは、操作マイクロスイッチ１４および水圧マイクロスイッチ１５がともにオフになると、遮断弁９のコイル９ａへの吸着電流の供給を停止するので、遮断弁９が閉弁されてバーナ３への燃料ガスの供給が断たれ、バーナ３の燃焼が停止する。 When it is desired to stop the hot water supply in such a hot water supply state, when the hot water operation tool 13 is pressed again, the operation micro switch 14 is turned off in conjunction with the pressing operation, and the water stop valve 4 is closed. Water supply is stopped, and as a result, hot water is also stopped. Further, when the water stop valve 4 is closed, the water governor 5 has no difference in water pressure. Therefore, the interlocking rod 10a responds in the direction in which the water pressure responsive valve 10 is closed, so that the water pressure responsive valve 10 is closed. The water pressure micro switch 15 is turned off. Then, when both the operation micro switch 14 and the water pressure micro switch 15 are turned off, the controller C stops supplying the adsorption current to the coil 9a of the shut-off valve 9, so that the shut-off valve 9 is closed and the burner 3 is closed. The supply of the fuel gas is cut off, and the combustion of the burner 3 is stopped.

＜不完全燃焼の検出＞
次に、バーナ３に酸欠による不完全燃焼が発生したり、熱交換器２の排気閉塞などの異常が起こったりした場合のコントローラＣにより実行される制御動作について説明する（図３Ａ、図３Ｂ参照）。 <Detection of incomplete combustion>
Next, the control operation executed by the controller C when incomplete combustion occurs due to lack of oxygen in the burner 3 or when an abnormality such as exhaust blockage of the heat exchanger 2 occurs (FIGS. 3A and 3B) will be described. reference).

前述の給湯を開始する操作を行い、遮断弁９の開弁、点火プラグ１６のスパークなどによるバーナ３への点火動作を開始してから２秒経過した以降に、第１熱電対１７の起電力が１．２ｍＶ以上になった時点で、バーナ３に着火した（着火検出状態である）とコントローラＣが判断し、点火プラグ１６のスパークのみを停止し、遮断弁９の開弁を維持して燃焼を継続する。 The electromotive force of the first thermocouple 17 is passed after 2 seconds have elapsed since the start of the hot water supply and the ignition operation of the burner 3 by the opening of the shut-off valve 9 and the spark of the spark plug 16 being started. When the pressure reaches 1.2 mV or more, the controller C determines that the burner 3 has ignited (ignition detection state), stops only the spark of the spark plug 16, and maintains the shut-off valve 9 open. Continue burning.

なお、もし、バーナ３への点火動作を開始してから２秒経過した時点で第１熱電対１７の起電力が１．２ｍＶ未満の場合は、バーナ３に着火しなかった（不着火検出状態である）とコントローラＣが判断し、遮断弁９を閉弁して、点火プラグ１６のスパークを停止し、点火動作を中断するとともに、報知部である異常報知ランプ２２を点滅させて、不着火検出状態により点火動作を中断したことを報知するように構成されている。 If the electromotive force of the first thermocouple 17 is less than 1.2 mV when 2 seconds have elapsed since the ignition operation to the burner 3 was started, the burner 3 was not ignited (non-ignition detection state Controller C determines that the shut-off valve 9 is closed, the spark of the spark plug 16 is stopped, the ignition operation is interrupted, and the abnormality notification lamp 22 which is a notification unit flashes to cause non-ignition. It is configured to notify that the ignition operation is interrupted depending on the detection state.

点火動作を開始してから着火検出状態になり、２秒以上経過し１０秒経過するまで、第１熱電対１７の起電力が２．５ｍＶ以上である場合は、コントローラＣは着火検出状態が維持されていると判断し、遮断弁９の開弁を維持して燃焼を継続する（ただし、２秒〜３秒の閾値は、１．２ｍＶ）。 The controller C maintains the ignition detection state when the electromotive force of the first thermocouple 17 is 2.5 mV or more from the start of the ignition operation until the ignition detection state is reached for 2 seconds or more and 10 seconds have elapsed. It is determined that the valve is open, and the combustion is continued while maintaining the shut-off valve 9 open (however, the threshold of 2 to 3 seconds is 1.2 mV).

なお、もし、バーナ３への点火動作を開始してから２秒以上経過し、１０秒経過するまでの間に第１熱電対１７の起電力が２．５ｍＶ未満になった場合は、バーナ３に着火しなかった（不着火検出状態である）とコントローラＣが判断し（ただし、２秒〜３秒の閾値は、１．２ｍＶ）、遮断弁９を閉弁することで点火動作を中断するとともに、異常報知ランプ２２を点滅させて、不着火検出状態により点火動作を中断したことを報知するように構成されている。 If the electromotive force of the first thermocouple 17 becomes less than 2.5 mV after 2 seconds have passed since the ignition operation of the burner 3 started and 10 seconds have passed, the burner 3 The controller C determines that the ignition is not ignited (non-ignition detection state) (however, the threshold of 2 to 3 seconds is 1.2 mV), and the ignition operation is interrupted by closing the shutoff valve 9 At the same time, the abnormality notification lamp 22 is blinked to notify that the ignition operation has been interrupted due to the non-ignition detection state.

因みに、一旦、第１熱電対１７の起電力が１．２ｍＶ以上であることを検出した後に、バーナ３に着火しなかったとコントローラＣが判断するための起電力の閾値は、１．２ｍＶから所定ヒステリシスを減じた１．２ｍＶより小さい値とすることが一般的であるが、点火動作を開始して最初に着火検出状態になった後しばらくの間は、熱電対の熱容量に起因して第１熱電対１７の起電力は上昇し続けることがわかっていることから、一旦第１熱電対１７の起電力が１．２ｍＶ以上であることを検出した後に、バーナ３に着火しなかったとコントローラＣが判断するための起電力の閾値を２．５ｍＶに設定している。 Incidentally, the threshold value of the electromotive force for the controller C to determine that the burner 3 did not ignite after detecting that the electromotive force of the first thermocouple 17 is 1.2 mV or more is predetermined from 1.2 mV. Generally, the hysteresis is reduced to a value smaller than 1.2 mV. However, for a while after the ignition operation is started and the ignition detection state is first set, the first is caused by the heat capacity of the thermocouple. Since it is known that the electromotive force of the thermocouple 17 continues to rise, the controller C determines that the burner 3 did not ignite after once detecting that the electromotive force of the first thermocouple 17 is 1.2 mV or more. The threshold of electromotive force for determination is set to 2.5 mV.

このように、点火動作を開始してから最初に着火検出したかどうかの判断を行う閾値を１．２ｍＶと低く設定することで、点火プラグ１６のスパークを早く停止することが可能となり、消費電力の低減が図られ、かつ、着火後１０秒経過するまで第１熱電対１７の起電力が２．５ｍＶ以上である場合には、燃焼が維持されていると判断し、遮断弁９の開弁を維持して燃焼を継続することにより、安全性が確保される。 Thus, by setting the threshold value for determining whether or not the ignition is detected for the first time after starting the ignition operation to a low value of 1.2 mV, it is possible to stop the spark of the spark plug 16 early and to reduce power consumption. If the electromotive force of the first thermocouple 17 is 2.5 mV or more until 10 seconds have elapsed after ignition, it is determined that combustion is maintained, and the shut-off valve 9 is opened. By maintaining the combustion and continuing the combustion, safety is ensured.

バーナ３への点火動作を開始した後、１０秒以降４０秒が経過するまでの間は、第１熱電対１７の起電力が第１酸欠基準（７ｍｖ）以上であるかどうかがコントローラＣによってチェックされ、第１熱電対１７の起電力が第１酸欠基準（７ｍｖ）以上である場合は、コントローラＣが酸欠燃焼ではない（正常燃焼検出状態である）と判断し、遮断弁９の開弁を維持して燃焼を継続する。 The controller C determines whether or not the electromotive force of the first thermocouple 17 is equal to or higher than the first oxygen deficiency reference (7 mv) during the period from 10 seconds to 40 seconds after the ignition operation of the burner 3 is started. When the check is made and the electromotive force of the first thermocouple 17 is equal to or greater than the first oxygen deficiency reference (7 mv), the controller C determines that it is not oxygen deficient combustion (normal combustion detection state), and the shutoff valve 9 Maintain combustion and continue combustion.

なお、もし、バーナ３への点火動作の開始後、１０秒以降４０秒が経過するまでの間に、第１熱電対１７の起電力が第１酸欠基準（７ｍｖ）未満になった場合は、コントローラＣが酸欠燃焼である（不完全燃焼検出状態）であると判断し、遮断弁９を閉弁することでバーナ３の燃焼を停止し、異常報知ランプ２２を点滅させて、不完全燃焼検出状態によりバーナ３の燃焼を停止したことを報知するように構成されている。 If the electromotive force of the first thermocouple 17 becomes less than the first oxygen deficiency reference (7 mv) after the start of the ignition operation to the burner 3 until 40 seconds elapse after 10 seconds. The controller C determines that it is oxygen deficient combustion (incomplete combustion detection state), and closes the shut-off valve 9 to stop the combustion of the burner 3 and cause the abnormality notification lamp 22 to blink, resulting in incompleteness. It is configured to notify that the combustion of the burner 3 is stopped by the combustion detection state.

バーナ３への点火動作の開始後４０秒を経過した時点（正確には４０秒経過する時点の直前の時点）において、バーナ３への点火動作の開始後４０秒を経過した時点以降に酸欠燃焼であるかどうかを判断するために、第２熱電対２１の起電力に基いて第２酸欠基準が設定される。 At the time when 40 seconds have elapsed since the start of the ignition operation to the burner 3 (to be exact, the time immediately before the time when 40 seconds have elapsed), the oxygen deficiency is reached after the time when 40 seconds have elapsed since the start of the ignition operation to the burner 3. In order to determine whether or not it is combustion, a second oxygen deficiency criterion is set based on the electromotive force of the second thermocouple 21.

なお、上記第２酸欠基準は第１熱電対１７により検出される温度の設定値であって、第１熱電対１７により検出される温度が、その値より低くなったときにバーナの燃焼が停止される値（この実施形態では、温度に対応する起電力の値）である。 Note that the second oxygen deficiency criterion is a set value of the temperature detected by the first thermocouple 17, and the burner burns when the temperature detected by the first thermocouple 17 becomes lower than that value. The value to be stopped (in this embodiment, the value of the electromotive force corresponding to the temperature).

バーナ３への点火動作の開始後４０秒を経過した時点（正確には４０秒を経過する時点の直前の時点）における第２熱電対２１の起電力が５．５ｍＶ以上である場合は、バーナ３の加熱量が大火力であるとコントローラＣが判断し、第２酸欠基準が１５ｍＶに設定される。 When the electromotive force of the second thermocouple 21 at the time when 40 seconds have elapsed after the start of the ignition operation to the burner 3 (precisely, the time immediately before the time when 40 seconds have elapsed) is 5.5 mV or more, The controller C determines that the heating amount of 3 is a large heating power, and the second oxygen deficiency standard is set to 15 mV.

また、バーナ３への点火動作の開始後４０秒を経過した時点（正確には４０秒を経過する時点の直前の時点）における第２熱電対２１の起電力が５．５ｍＶ未満である場合は、バーナ３の加熱量が小火力であるとコントローラＣが判断し、第２酸欠基準が１３．５ｍＶに設定される。 Further, when the electromotive force of the second thermocouple 21 is less than 5.5 mV at the time when 40 seconds have elapsed after the start of the ignition operation to the burner 3 (more precisely, the time immediately before the time when 40 seconds have elapsed) Then, the controller C determines that the heating amount of the burner 3 is a small heating power, and the second oxygen deficiency standard is set to 13.5 mV.

そして、バーナ３への点火動作の開始後４０秒を経過した時点以降においては、第１熱電対１７の起電力が第２酸欠基準以上であるかどうかがコントローラＣによってチェックされ、第１熱電対１７の起電力が第２酸欠基準以上である場合は、コントローラＣが酸欠燃焼ではない（正常燃焼検出状態である）と判断し、遮断弁９の開弁を維持して燃焼を継続する。 Then, after 40 seconds from the start of the ignition operation to the burner 3, the controller C checks whether the electromotive force of the first thermocouple 17 is equal to or higher than the second oxygen deficiency reference, and the first thermoelectric When the electromotive force of the pair 17 is equal to or greater than the second oxygen deficiency reference, the controller C determines that the oxygen deficient combustion is not occurring (normal combustion detection state), and maintains the shut-off valve 9 open to continue combustion To do.

なお、バーナ３への点火動作の開始後４０秒を経過した時点以降において、第１熱電対１７の起電力が第２酸欠基準未満になった場合は、酸欠燃焼である（不完全燃焼検出状態である）とコントローラＣが判断し、遮断弁９を閉弁することでバーナ３の燃焼を停止し、異常報知ランプ２２を点滅させて、不完全燃焼検出状態によりバーナ３の燃焼を停止したことを報知するように構成されている。 In addition, after 40 seconds have elapsed since the start of the ignition operation to the burner 3, if the electromotive force of the first thermocouple 17 becomes less than the second oxygen deficiency standard, it is oxygen deficient combustion (incomplete combustion). The controller C determines that the detection valve is in the detection state, and the combustion of the burner 3 is stopped by closing the shut-off valve 9, the abnormality notification lamp 22 is blinked, and the combustion of the burner 3 is stopped by the incomplete combustion detection state. It is comprised so that it may alert | report.

図３Ａは、バーナ３の加熱量（火力）を最大火力に設定した、バーナ３の加熱量が大火力である状態に相当する場合における第１熱電対１７の起電力と第１酸欠基準や第２酸欠基準との関係、および、第２熱電対２１の起電力と排気閉塞状態検出との関係を表している。 FIG. 3A shows an electromotive force of the first thermocouple 17 and a first oxygen deficiency criterion when the heating amount of the burner 3 is set to the maximum heating power and the heating amount of the burner 3 corresponds to a state of a large heating power. The relationship between the second oxygen deficiency standard and the relationship between the electromotive force of the second thermocouple 21 and the detection of the exhaust plugging state is shown.

また、図３Ｂは、バーナ３の加熱量（火力）を最小火力に設定した、バーナ３の加熱量が小火力である状態に相当する場合における第１熱電対１７の起電力と第１酸欠基準や第２酸欠基準との関係、および、第２熱電対２１の起電力と排気閉塞状態検出との関係を表している。 FIG. 3B shows the electromotive force of the first thermocouple 17 and the first oxygen deficiency when the heating amount of the burner 3 is set to the minimum heating power and the heating amount of the burner 3 corresponds to the state of small heating power. The relationship between the reference and the second oxygen deficiency criterion, and the relationship between the electromotive force of the second thermocouple 21 and the exhaust blockage state detection are shown.

図３Ａに示すように、バーナ３の加熱量が大火力のときには、バーナ３への点火動作の開始後４０秒を経過した時点（正確には４０秒を経過する時点の直前の時点）における第２熱電対２１の起電力が５．５ｍＶ以上である場合、バーナ３の加熱量が大火力であるとコントローラＣが判断し、第２酸欠基準がバーナ３の加熱量は大火力のときに適した値である１５ｍＶに設定されているが、バーナ３の加熱量が大火力のときの第１熱電対１７の起電力は第２酸欠基準である１５ｍＶを大きく上回っており、燃焼が継続される。 As shown in FIG. 3A, when the amount of heating of the burner 3 is large, the first time at the time when 40 seconds have elapsed after the start of the ignition operation to the burner 3 (precisely, the time immediately before the time when 40 seconds have elapsed). 2 When the electromotive force of the thermocouple 21 is 5.5 mV or more, the controller C determines that the heating amount of the burner 3 is large thermal power, and the second oxygen deficiency criterion is when the heating amount of the burner 3 is large thermal power. Although it is set to a suitable value of 15 mV, the electromotive force of the first thermocouple 17 when the heating amount of the burner 3 is large thermal power greatly exceeds 15 mV, which is the second oxygen deficiency standard, and combustion continues. Is done.

また、図３Ｂに示すように、バーナ３の加熱量が小火力のときには、バーナ３への点火動作の開始後４０秒を経過した時点（正確には４０秒を経過する時点の直前の時点）における第２熱電対２１の起電力が５．５ｍＶ未満である場合、バーナ３の加熱量が小火力であるとコントローラＣが判断し、第２酸欠基準がバーナ３の加熱量が小火力のときに適した値である１３．５ｍＶに設定されているが、バーナ３の加熱量が小火力のときでも第１熱電対１７の起電力は第２酸欠基準である１３．５ｍＶを上回っており、燃焼が継続される。 As shown in FIG. 3B, when the heating amount of the burner 3 is a small heating power, when 40 seconds have elapsed after the start of the ignition operation to the burner 3 (precisely, immediately before the point when 40 seconds have elapsed) When the electromotive force of the second thermocouple 21 is less than 5.5 mV, the controller C determines that the heating amount of the burner 3 is a small heating power, and the second oxygen deficiency criterion is that the heating amount of the burner 3 is a small heating power. Although it is set to 13.5 mV, which is sometimes suitable, the electromotive force of the first thermocouple 17 exceeds 13.5 mV, which is the second oxygen deficiency criterion, even when the heating amount of the burner 3 is small thermal power. And combustion continues.

なお、本発明においては、筒胴１内の燃焼ガスの排気通路がいくらか狭くなって多少の排気閉塞状態が発生した場合には、第２熱電対２１の起電力は、上述のような排気閉塞状態が発生していない場合に比べて多少大きくなることから、上記の第２酸欠基準は大きい値に設定されることになり、筒胴１内の燃焼ガスの排気通路がいくらか狭くなって多少の排気閉塞状態が発生した場合にも、第２酸欠基準が誤って小さい値に設定されるという不安全な状態が生じることがなく、安全性が確保されるように構成されている。 In the present invention, when the exhaust passage of the combustion gas in the cylinder body 1 is somewhat narrowed and a slight exhaust blockage occurs, the electromotive force of the second thermocouple 21 is the exhaust plug block as described above. Since the second oxygen deficiency standard is set to a large value because it is slightly larger than when no state has occurred, the exhaust passage for the combustion gas in the cylinder body 1 is somewhat narrowed to some extent. Even when an exhaust blockage state occurs, an unsafe state in which the second oxygen deficiency standard is erroneously set to a small value does not occur, and safety is ensured.

なお、コントローラＣが、熱交換器２の排気閉塞状態であると判断してバーナ３の燃焼を停止した回数が所定の回数に達したときには、コントローラＣに対して所定のリセット操作（例えばメンテナンス作業者によるリセットスイッチの操作）が行われるまで、点火操作がなされてもバーナ３の燃焼を開始しないように構成されている。 When the controller C determines that the heat exchanger 2 is in the exhaust blockage state and the combustion of the burner 3 has stopped a predetermined number of times, the controller C performs a predetermined reset operation (for example, maintenance work). The burner 3 is not combusted until the ignition operation is performed until the reset switch is operated by a person.

＜特徴的な構成および動作＞
この実施形態にかかる屋内設置型給湯装置は、以下の特徴的構成を備えている。 <Characteristic configuration and operation>
The indoor installation type hot water supply apparatus according to this embodiment has the following characteristic configuration.

すなわち、本実施形態の屋内設置型給湯装置は、熱交換器の周囲温度を検出する第２熱電対（第２温度検出部）２１の検出値である第２検出値が所定の排気閉塞検出用閾値（バーナ３の点火後１５秒以上経過した時点で、１８．５ｍＶ）以下の状態で、上記第２検出値が所定の増加特性を示したときに、熱交換器２の清掃を促す旨の報知を行う報知部を備えている。 That is, in the indoor-installed hot water supply apparatus of the present embodiment, the second detection value that is the detection value of the second thermocouple (second temperature detection unit) 21 that detects the ambient temperature of the heat exchanger is a predetermined exhaust blockage detection. When the second detection value shows a predetermined increase characteristic in a state of a threshold value (18.5 mV when 15 seconds or more have elapsed after the ignition of the burner 3), the cleaning of the heat exchanger 2 is urged. An informing unit for informing is provided.

なお、本実施形態では、熱交換器２の清掃を促す旨の報知を行う報知部として、バーナ３の燃焼を停止したことを報知する報知部である異常報知ランプ２２が共用されており、この異常報知ランプ２２の点滅によって熱交換器２の清掃を促す旨の報知が行われるように構成されている。 In the present embodiment, an abnormality notification lamp 22 that is a notification unit that notifies that combustion of the burner 3 has been stopped is shared as a notification unit that notifies that the heat exchanger 2 is to be cleaned. It is configured such that notification that the cleaning of the heat exchanger 2 is urged is performed by blinking of the abnormality notification lamp 22.

すなわち、熱交換器２の清掃を促す旨の報知を行う報知部による報知は、異常報知ランプ２２の点滅によって行われ、バーナ３の燃焼を停止したときの報知の態様（たとえば、０．５秒ＯＮ−０．５秒ＯＦＦの周期１秒の点滅、あるいは、１秒ＯＮ−１秒ＯＦＦの周期２秒の点滅）と異なる態様（例えば、０．２５秒ＯＮ−０．２５秒ＯＦＦの周期０．５秒で点滅）で行われる。 That is, the notification by the notification unit that notifies that the heat exchanger 2 is to be cleaned is performed by blinking of the abnormality notification lamp 22, and a notification mode when the combustion of the burner 3 is stopped (for example, 0.5 seconds). ON-0.5 second OFF period 1 second blinking, or 1 second ON-1 second OFF period 2 second blinking) (for example, 0.25 second ON-0.25 second OFF period 0) .. blinking in 5 seconds).

このように、第２熱電対２１の検出値（第２検出値）が所定の排気閉塞検出用閾値（バーナ３の点火後１５秒以上経過した時点で、１８．５ｍＶ）以下の状態で、第２熱電対の検出値（第２検出値）が所定の増加特性を示したとき、熱交換器２の清掃を促す旨の報知を行う報知部（バーナ３の燃焼を停止したときの報知を行う異常報知ランプ２２と共用）を備えているので、熱交換器２の閉塞状態（不完全燃焼検出状態）であると判断されてバーナ３の燃焼を停止する前に熱交換器２の清掃を促す旨の報知が行われることになり、熱交換器２の清掃を行うことで、熱交換器２の閉塞状態（不完全燃焼検出状態）であると判断されてバーナ３の燃焼が停止されてしまう事態に至ることを抑制することが可能になる。 Thus, in a state where the detection value (second detection value) of the second thermocouple 21 is equal to or lower than a predetermined exhaust blockage detection threshold (18.5 mV when 15 seconds or more have elapsed after the ignition of the burner 3), When the detection value (second detection value) of the two thermocouples shows a predetermined increase characteristic, a notification unit that notifies that the heat exchanger 2 is to be cleaned (notification when combustion of the burner 3 is stopped) is performed. (The abnormality notification lamp 22 is shared), so that the heat exchanger 2 is urged to be cleaned before it is determined that the heat exchanger 2 is closed (incomplete combustion detection state) and combustion of the burner 3 is stopped. This is notified, and by cleaning the heat exchanger 2, it is determined that the heat exchanger 2 is in a closed state (incomplete combustion detection state), and the combustion of the burner 3 is stopped. It becomes possible to suppress reaching the situation.

したがって、熱交換器２が閉塞状態であると判断されてバーナ３の燃焼が停止されることが繰り返され、バーナ３の燃焼停止の回数が所定の回数に達して、点火操作がなされてもバーナ３が燃焼を開始しない状態（給湯装置の使用が禁止された状態）に至ることを抑制、防止することができる。 Therefore, it is repeatedly determined that the heat exchanger 2 is in the closed state and the combustion of the burner 3 is stopped, and even if the number of times of the combustion stop of the burner 3 reaches a predetermined number and the ignition operation is performed, the burner 3 can be suppressed and prevented from reaching a state where combustion does not start (a state where use of the hot water supply apparatus is prohibited).

上述のように、本発明によれば、バーナ３の燃焼を停止した回数が所定の回数に達し、所定のリセット操作が行われるまでの間バーナ３が燃焼を開始しない、という不便な状態（給湯装置の使用が禁止された状態）に至ることを回避することが可能で、使い勝手のよい屋内設置型給湯装置を実現することができる。 As described above, according to the present invention, the number of times the combustion of the burner 3 is stopped reaches a predetermined number, and the burner 3 does not start combustion until a predetermined reset operation is performed (hot water supply) State in which use of the apparatus is prohibited) can be avoided, and an easy-to-use indoor installation type hot water supply apparatus can be realized.

また、本実施形態では、上述のように異常報知ランプ２２を、熱交換器２の清掃を促す旨の報知を行う報知部としても用いる（共用する）ようにしているので、部品点数を減らしてコストの低減を図ることができる。 Further, in the present embodiment, as described above, the abnormality notification lamp 22 is also used (shared) as a notification unit for notifying that the heat exchanger 2 is to be cleaned, so the number of parts is reduced. Cost can be reduced.

次に、本発明における、第２温度検出部である第２熱電対２１の検出値（第２検出値）が所定の増加特性を示すという、熱交換器２の清掃を促す旨の報知を行うためのトリガーとなる現象について説明を加える。 Next, in the present invention, a notification that the detected value (second detected value) of the second thermocouple 21 that is the second temperature detecting unit shows a predetermined increase characteristic is made to promote cleaning of the heat exchanger 2. An explanation of the phenomenon that triggers

本実施形態にかかる屋内設置型給湯装置においては、コントローラＣが、バーナ３の燃焼開始後、所定第１時間（例えば、１５０秒）経過時点の第２熱電対２１の検出値（第２検出値）、および、バーナ３の燃焼開始後、所定第１時間より長い所定第２時間（例えば、５００秒）経過時点の第２熱電対２１の検出値（第２検出値）を記憶する記憶部（図示せず）を備えている。 In the indoor hot water supply apparatus according to the present embodiment, the controller C detects the detection value (second detection value) of the second thermocouple 21 when a predetermined first time (for example, 150 seconds) has elapsed after the start of combustion of the burner 3. ) And a storage unit that stores a detection value (second detection value) of the second thermocouple 21 when a predetermined second time (for example, 500 seconds) longer than the predetermined first time has elapsed after the start of combustion of the burner 3 ( (Not shown).

そして、所定第２時間経過時点（例えば、５００秒）の第２検出値が、所定第１時間経過時点（例えば、１５０秒）の第２検出値より大きい値となったときに、第２検出値が所定の増加特性を示したと判定されるように構成されている。 Then, the second detection value is detected when the second detection value at the predetermined second time elapsed time (for example, 500 seconds) is larger than the second detection value at the predetermined first time elapsed time (for example, 150 seconds). It is configured to determine that the value indicates a predetermined increase characteristic.

本実施形態にかかる屋内設置型給湯装置は上述のように構成されているので、バーナ３の燃焼開始後、所定第１時間（例えば、１５０秒）経過時点の第２検出値、および、バーナ３の燃焼開始後、所定第１時間より長い所定第２時間（例えば、５００秒）経過時点の第２検出値によって、第２検出値が所定の増加特性を示すことを判定することができるので、第２検出値が所定の増加特性を示すことが簡単に、しかも適正に判定することができる。 Since the indoor hot water supply apparatus according to the present embodiment is configured as described above, the second detection value when the predetermined first time (for example, 150 seconds) has elapsed after the start of combustion of the burner 3, and the burner 3 After the start of combustion, it can be determined that the second detection value exhibits a predetermined increase characteristic based on the second detection value when a predetermined second time (for example, 500 seconds) that is longer than the predetermined first time has elapsed. It can be easily and appropriately determined that the second detection value exhibits a predetermined increase characteristic.

その結果、バーナ３の燃焼が停止される前に、熱交換器２の清掃を促す旨の報知が行われることになり、熱交換器２の清掃を行うことで、熱交換器２が閉塞状態（不完全燃焼検出状態）に至ったと判断されてバーナ３の燃焼が停止されてしまうことを抑制することが可能になる。 As a result, before the combustion of the burner 3 is stopped, notification that the cleaning of the heat exchanger 2 is promoted is performed, and the heat exchanger 2 is closed by cleaning the heat exchanger 2. It is possible to prevent the combustion of the burner 3 from being stopped because it is determined that (the incomplete combustion detection state) has been reached.

つまり、図４に破線で示すように第２熱電対２１の検出値（第２検出値）が徐々に増加する場合、バーナの燃焼開始後、所定第１時間（例えば、１５０秒）経過時点の第２検出値、および、バーナの燃焼開始後、所定第１時間より長い所定第２時間（例えば、５００秒）経過時点の第２検出値によって、第２検出値が所定の増加特性を示すことを確実に判定することができる。 That is, as indicated by a broken line in FIG. 4, when the detection value (second detection value) of the second thermocouple 21 gradually increases, a predetermined first time (for example, 150 seconds) has elapsed after the start of combustion of the burner. The second detection value exhibits a predetermined increase characteristic according to the second detection value and the second detection value at the time when a predetermined second time (for example, 500 seconds) longer than the predetermined first time has elapsed after the start of combustion of the burner. Can be reliably determined.

なお、本実施形態では、熱交換器２の清掃を促す旨の報知が、バーナ３の燃焼を停止したことを報知する報知部である異常報知ランプ２２の点滅によって行われるように構成されている（すなわち、異常報知ランプ２２が、換気を促す旨の報知を行う報知部として共用されている）が、熱交換器２の清掃を促す旨の報知を行う報知部を異常報知ランプ２２とは別に設けてもよい。 In the present embodiment, the notification that the cleaning of the heat exchanger 2 is urged is performed by the blinking of the abnormality notification lamp 22 that is a notification unit that notifies that the combustion of the burner 3 has been stopped. (That is, the abnormality notification lamp 22 is shared as a notification unit that notifies that ventilation is promoted.) However, the notification unit that notifies that the heat exchanger 2 is cleaned is separated from the abnormality notification lamp 22. It may be provided.

また、熱交換器２の清掃を促す旨の報知を行う報知部による報知を、音声やブザーによる電子音によって行うように構成してもよい。 Moreover, you may comprise so that the alerting | reporting part which alert | reports that the cleaning of the heat exchanger 2 is promoted may be performed with an audio | voice and the electronic sound by a buzzer.

本発明は、上記実施形態に限定されるものではなく、本発明の範囲内において種々の変形を加えることが可能である。 The present invention is not limited to the above embodiment, and various modifications can be made within the scope of the present invention.

１筒胴
１ａ測温用開口
２熱交換器
３バーナ
４止水弁
５水ガバナ
６分流弁
７フレキシブル管
８出湯具
９遮断弁
９ａコイル
１０水圧応動弁
１０ａ連動杆
１１ガスガバナ
１２調整弁
１３出湯操作具
１４操作マイクロスイッチ
１５水圧マイクロスイッチ
１６点火プラグ
１７第１温度検出部（第１熱電対）
１８ガスノズル
１９ノズル近傍用温度ヒューズ
２０筒胴用温度ヒューズ
２１第２温度検出部（第２熱電対）
２２異常報知ランプ
Ｂｔ乾電池
Ｃコントローラ
Ｇガス供給路
Ｒ燃焼室
Ｗｂバイパス路
Ｗｉ給水路
Ｗｏ出湯路 DESCRIPTION OF SYMBOLS 1 Tube barrel 1a Temperature measurement opening 2 Heat exchanger 3 Burner 4 Water stop valve 5 Water governor 6 Diverging valve 7 Flexible pipe 8 Hot water outlet 9 Shut-off valve 9a Coil 10 Water pressure responsive valve 10a Interlocking rod 11 Gas governor 12 Adjustment valve 13 Hot water operation Tool 14 Operation micro switch 15 Water pressure micro switch 16 Spark plug 17 1st temperature detection part (1st thermocouple)
18 Gas nozzle 19 Nozzle temperature fuse 20 Cylinder temperature fuse 21 Second temperature detector (second thermocouple)
22 Abnormality alarm lamp Bt Dry cell C Controller G Gas supply path R Combustion chamber Wb Bypass path Wi Water supply path Wo Hot water path

Claims

A burner that starts combustion by ignition operation;
A heat exchanger heated by a combustion flame of the burner;
A first temperature detector for detecting the temperature of the combustion flame of the burner and outputting it as a first detection value;
The ambient temperature of the heat exchanger heated by the combustion flame of the burner is detected, and the detected value is determined whether or not an exhaust blockage state occurs in which the exhaust passage of the heat exchanger becomes narrow and the exhaust gas hardly flows. A second temperature detection unit that outputs a second detection value for
A controller for controlling combustion of the burner based on the second detection value,
When the second detection value is higher than a predetermined exhaust blockage detection threshold for detecting the exhaust blockage state of the heat exchanger, the controller determines that the heat exchanger is in an exhaust blockage state. The combustion of the burner is stopped,
When the controller determines that the heat exchanger is in an exhaust blockage state and the combustion of the burner has stopped a predetermined number of times, the ignition is continued until a predetermined reset operation is performed on the controller. An indoor installation type hot water supply device configured not to start combustion of the burner even if an operation is performed,
An informing unit for informing that cleaning of the heat exchanger is promoted when the second detection value exhibits a predetermined increase characteristic in a state where the second detection value is equal to or less than the predetermined exhaust gas blockage detection threshold; An indoor hot water supply system characterized in that it is equipped.

The controller detects the second detection value when a predetermined first time elapses after the start of combustion of the burner, and the second detection time elapses after a predetermined second time longer than the predetermined first time after the burner starts combustion. A storage unit for storing the detected value;
When the second detection value when the predetermined second time elapses becomes larger than the second detection value when the predetermined first time elapses, the second detection value exhibits the predetermined increase characteristic. The indoor installation type hot water supply device according to claim 1, wherein the indoor installation type hot water supply device is configured to determine that the

The controller includes a combustion stop notification unit that performs notification when the combustion of the burner is stopped by determining that the heat exchanger is in an exhaust blockage state,
The notification unit when the combustion is stopped is also used as the notification unit that notifies that the heat exchanger is to be cleaned,
The notification that the cleaning unit is instructed to clean the heat exchanger is configured to be performed in a mode different from the notification when the combustion of the burner is stopped. The indoor installation type hot water supply apparatus according to 1 or 2.