JP6057125B2 - Combustion device - Google Patents

Combustion device Download PDF

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JP6057125B2
JP6057125B2 JP2013007823A JP2013007823A JP6057125B2 JP 6057125 B2 JP6057125 B2 JP 6057125B2 JP 2013007823 A JP2013007823 A JP 2013007823A JP 2013007823 A JP2013007823 A JP 2013007823A JP 6057125 B2 JP6057125 B2 JP 6057125B2
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combustion
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heat
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岡本　真一
真一 岡本
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Noritz Corp
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Description

本発明は、燃焼装置に関するものであり、特に燃焼段数の切換が可能な燃焼装置の技術に関する。   The present invention relates to a combustion apparatus, and more particularly to a technique of a combustion apparatus capable of switching the number of combustion stages.

一般家庭に給湯装置が広く普及している。この給湯装置には、ガスや液体を燃料とし、これらを燃焼させて水を加熱するものがある。すなわち、この種の給湯装置は、湯水が通過する熱交換器を具備した燃焼装置を備え、熱交換器内を通過する湯水を、燃焼によって生成された燃焼ガスで加熱するものである。具体的には、需要者によってカラン等が操作されて、給湯装置内に配された流水系統に一定量以上の通水が生じると、燃焼装置に設けられた燃焼部おいて燃焼制御が実施され、前記流水系統の一部を形成する熱交換器内の水が昇温する。   Hot water supply devices are widely used in general households. Some hot water supply apparatuses use gas or liquid as fuel and burn these to heat water. That is, this type of hot water supply apparatus includes a combustion apparatus including a heat exchanger through which hot water passes, and heats hot water passing through the heat exchanger with combustion gas generated by combustion. Specifically, when a customer operates a currant or the like and a flow of water of a certain amount or more occurs in a running water system arranged in the hot water supply device, combustion control is performed in a combustion section provided in the combustion device. The water in the heat exchanger that forms part of the flowing water system is heated.

また、この種の給湯装置では、カラン等から出湯される湯の温度が、予め設定された温度となるように、燃焼装置における燃焼量が調整される。より詳細には、給湯装置に入水される入水温度や通水量に基づいて、設定温度まで加熱するのに必要な燃焼量が演算される。そして、燃焼初期においては、前記した演算による燃焼量となるように、燃料供給量を制御して燃焼装置が運転される（フィードフォワード制御又はＦＦ制御という）。一般的に、ＦＦ制御においては、比例弁等の開度と、燃焼量と、の関係を予めデータ化しておき、演算された燃焼量を目標値とし、前記したデータを参照して目標値の燃焼量となるように比例弁等の開度を制御する。   Further, in this type of hot water supply device, the combustion amount in the combustion device is adjusted so that the temperature of hot water discharged from the currant or the like becomes a preset temperature. More specifically, the amount of combustion necessary for heating to the set temperature is calculated based on the incoming water temperature and the amount of water flowing into the hot water supply device. In the early stage of combustion, the combustion apparatus is operated by controlling the fuel supply amount so as to achieve the combustion amount by the above-described calculation (referred to as feedforward control or FF control). In general, in FF control, the relationship between the opening of a proportional valve or the like and the combustion amount is converted into data beforehand, and the calculated combustion amount is set as a target value. The opening of the proportional valve or the like is controlled so that the combustion amount is obtained.

また、燃焼初期を過ぎると、前記したＦＦ制御に加え、実際の出湯温度を検出して燃焼量を補正する。すなわち、燃焼開始初期を過ぎれば、前記したＦＦ制御に加えて、実際の出湯温度が設定温度になるようにフィードバック制御（ＦＢ制御）を行う。
例えば、特許文献１に、ＦＦ制御及びＦＢ制御により燃焼量を制御する燃焼装置が開示されている。 When the initial combustion period is passed, in addition to the FF control described above, the actual hot water temperature is detected to correct the combustion amount. That is, if the initial combustion start is passed, in addition to the above-described FF control, feedback control (FB control) is performed so that the actual hot water temperature becomes the set temperature.
For example, Patent Document 1 discloses a combustion apparatus that controls a combustion amount by FF control and FB control.

特開２００８−１２８５７５号公報JP 2008-128575 A

しかしながら、従来の給湯装置においては、このような制御をもってしても、燃焼装置の運転中に、需要者等がカラン等を操作し、設定温度や出湯量が短い期間に幾度となく変更されると、予期せぬ高温の湯が出湯されてしまう場合があった。また、この現象は、燃焼領域が複数に区分され、各燃焼領域へ供給される燃料を開閉弁で制限することを可能とした機能（燃焼段数の切換制御）を備えた燃焼装置において顕著であった。
以下に、それについて説明する。 However, in the conventional hot water supply apparatus, even with such control, the consumer or the like operates the currant or the like during operation of the combustion apparatus, and the set temperature and the amount of hot water are changed several times in a short period. In some cases, unexpectedly hot water was discharged. In addition, this phenomenon is significant in a combustion apparatus having a function (switching control of the number of combustion stages) that allows the combustion regions to be divided into a plurality of regions and restricts the fuel supplied to each combustion region by an on-off valve. It was.
This will be described below.

ここで、燃焼段数の切換制御（以下、単に段数切換制御という）について付言しておくと、この段数切換制御は、出湯量（又は入水量）の増減や設定温度の変化によって、燃焼量（要求燃焼量）が増減された場合に、開閉弁の開閉状態を制御して燃焼領域の拡張あるいは減縮を行い、前記増減した要求燃焼量に応じた燃焼量に制御するものである。すなわち、段数切換制御は、燃焼させる領域の数（主に燃焼面積の大小）やその組み合わせを変化させて、変更された要求燃焼量に応じた燃焼段数に切り換える制御である。   Here, the combustion stage number switching control (hereinafter simply referred to as “stage number switching control”) is additionally described. This stage number switching control is performed by increasing or decreasing the amount of tapping water (or the amount of incoming water) or by changing the set temperature. When the (combustion amount) is increased or decreased, the open / close state of the on-off valve is controlled to expand or contract the combustion region, and the combustion amount is controlled according to the increased or decreased required combustion amount. That is, the stage number switching control is a control for changing to the number of combustion stages according to the changed required combustion amount by changing the number of combustion regions (mainly the size of the combustion area) and the combination thereof.

より詳細には、段数切換制御では、現在の要求燃焼量を増大あるいは減少する場合において、現在の要求燃焼量に応じた燃焼段数から、新たな要求燃焼量（目標燃焼量）に応じた燃焼段数に切り換えられる。例えば、図１１に示すように、現在の要求燃焼量から燃焼量を増大（減少）させるべく、現在非燃焼状態の燃焼領域Ｂを燃焼させる場合においては、隣接する燃焼領域Ａ、Ｂ間で火移りが行われ（図１１（ａ）〜（ｂ））、前記非燃焼状態の燃焼領域Ｂに点火される。またこのとき、燃焼量の増大あるいは減少に関わらず、目標燃焼量によっては、図１１（ｃ）に示すように、既に燃焼状態であった燃焼領域Ａの火が消され、非燃焼状態に制御される場合もある。
なお、燃焼量を減少する場合に限っては、図１２に示すように、単にいずれかの燃焼領域Ｃの火を消すだけの場合があり、その場合は、隣接する燃焼領域Ａ〜Ｃ間における火移りは行われない。 More specifically, in the stage number switching control, when increasing or decreasing the current required combustion amount, the number of combustion stages corresponding to the new required combustion amount (target combustion amount) from the number of combustion stages corresponding to the current required combustion amount. Can be switched to. For example, as shown in FIG. 11, in order to increase (decrease) the combustion amount from the current required combustion amount, when burning the combustion region B that is currently in the non-combustion state, a fire is caused between the adjacent combustion regions A and B. Transfer is performed (FIGS. 11A to 11B), and the non-combustion combustion region B is ignited. At this time, regardless of the increase or decrease in the combustion amount, depending on the target combustion amount, as shown in FIG. 11 (c), the fire in the combustion region A that was already in the combustion state is extinguished and controlled to the non-combustion state. Sometimes it is done.
Note that only when the amount of combustion is reduced, as shown in FIG. 12, there is a case where the fire in any one of the combustion regions C is simply extinguished, and in that case, between the adjacent combustion regions A to C. There is no fire transfer.

そして、段数切換制御によって、燃焼面積の拡張又は減縮が行われ、新たな燃焼領域が点火された場合には、安全的観点から、緩点火動作が実施される（図１１（ｂ））。すなわち、緩点火動作は、目標燃焼量に基づいた燃焼動作を実施するための準備動作であり、確実且つ安全な点火を目的としたものである。そして、緩点火動作では、通常、燃焼段数ごとに予め設定された固定燃焼量で燃焼される。より詳細には、緩点火動作においては、当該燃焼段数における燃焼量の制御範囲内の１点で燃焼が行われる。   Then, when the combustion area is expanded or reduced by the stage number switching control and a new combustion region is ignited, a slow ignition operation is performed from a safety viewpoint (FIG. 11B). That is, the slow ignition operation is a preparatory operation for performing the combustion operation based on the target combustion amount, and is intended for reliable and safe ignition. In the slow ignition operation, combustion is normally performed with a fixed combustion amount set in advance for each number of combustion stages. More specifically, in the slow ignition operation, combustion is performed at one point within the combustion amount control range for the number of combustion stages.

また、緩点火動作では、カラン等の操作によって変更される情報（設定温度や出湯量等）が一切更新されることがない。つまり、緩点火動作では、その最中に、いくらカラン等を操作しても、緩点火動作に突入するきっかけとなった目標燃焼量を基準とした燃焼制御が実施される。このため、緩点火動作のきっかけとなった目標燃焼量に応じた燃焼段数と、緩点火動作の最中において変更された目標燃焼量に応じた燃焼段数とが相違してしまう場合があった。その結果、緩点火動作の基準とされた燃焼段数による燃焼量が、実際に要する燃焼量よりも過剰となってしまう場合があり、出湯温度が意図せず高温になってしまうおそれがあった。   Further, in the slow ignition operation, information (set temperature, amount of hot water, etc.) changed by an operation such as currant is never updated. In other words, during the slow ignition operation, no matter how much the currant or the like is operated, the combustion control is performed based on the target combustion amount that triggered the slow ignition operation. For this reason, the number of combustion stages corresponding to the target combustion amount that has triggered the slow ignition operation may differ from the number of combustion stages corresponding to the target combustion amount changed during the slow ignition operation. As a result, the amount of combustion based on the number of combustion stages used as a reference for the slow ignition operation may become excessive as compared with the amount of combustion actually required, and the tapping temperature may become unintentionally high.

そこで、本発明では、従来の問題点に鑑み、緩点火動作の最中に、需要者等がカラン等を操作して、設定温度や出湯量を短い期間に幾度となく変更したとしても、予期せぬ高温の湯が出湯されてしまうおそれがない燃焼装置を提供することを課題とする。   Therefore, in the present invention, in view of the conventional problems, even if the consumer operates the currant etc. during the slow ignition operation and changes the set temperature and the amount of hot water several times in a short period of time, it is expected It is an object of the present invention to provide a combustion apparatus in which there is no risk that undesired hot water is discharged.

上記課題を解決するべく提供される請求項１に記載の発明は、１又は複数のバーナによって形成されたバーナ群を複数有し、さらに送風機と、少なくとも２つのバーナ群のそれぞれに対応するように設けられた燃料弁とを備え、要求される熱量の大きさに応じて、燃料弁の開閉状態を切り換えて燃焼領域に相当する燃焼段数を切り換える段数切換制御の実施が可能であり、要求される熱量が変更されて、段数切換制御によって燃料弁が開成された場合には、当該燃料弁に対応した燃焼領域のバーナ群は、所定の熱量で燃焼する緩点火動作を行い、その後、前記変更された要求熱量に応じた燃焼動作の実施を可能とする燃焼装置であって、緩点火動作では、燃焼段数ごとに設定された所定の熱量に応じた燃焼制御が行われるものであり、緩点火動作の最中に、目標とする熱量が新たな要求熱量に変更されて、当該新たな要求熱量に応じた燃焼段数が、当該変更前の目標とする要求熱量に応じた燃焼段数よりも小さいことが確認された場合には、当該新たな要求熱量に応じた燃焼段数に応じた緩点火動作が実施されることを特徴とする燃焼装置である。   The invention according to claim 1 provided to solve the above-described problem has a plurality of burner groups formed by one or a plurality of burners, and further corresponds to each of the blower and at least two burner groups. It is possible to carry out stage number switching control that switches the number of combustion stages corresponding to the combustion region by switching the open / close state of the fuel valve according to the required amount of heat. When the amount of heat is changed and the fuel valve is opened by the stage number switching control, the burner group in the combustion region corresponding to the fuel valve performs a slow ignition operation that burns with a predetermined amount of heat, and then the change is made. A combustion apparatus that can perform a combustion operation according to the required amount of heat, and in the slow ignition operation, combustion control is performed according to a predetermined amount of heat set for each number of combustion stages. During the operation, the target heat quantity is changed to a new required heat quantity, and the number of combustion stages corresponding to the new required heat quantity is smaller than the number of combustion stages corresponding to the target required heat quantity before the change. Is confirmed, a slow ignition operation corresponding to the number of combustion stages corresponding to the new required heat amount is performed.

本発明の燃焼装置は、燃料弁の開閉状態を切り換えて、燃焼領域に相当する燃焼段数の切り換えを可能とした段数切換制御の実施を可能とした基本構成を備えている。すなわち、本発明の燃焼装置は、現在燃焼中の燃焼領域における火炎の大きさを変化させるだけでなく、現在燃焼中の燃焼領域に加えて新たな燃焼領域を燃焼（燃焼領域の拡張）させたり、逆に現在の燃焼領域に替えてより小さな燃焼領域で燃焼又は現在の燃焼領域の一部を非燃焼状態（燃焼領域の減縮）にさせたりして、要求される熱量（目標熱量ともいう）に応じた燃焼状態に変化させることが可能である。さらに、本発明の燃焼装置は、燃焼段数の切換によって、新たな燃焼領域を燃焼させる場合においては、安全等の観点から、緩点火動作の実施が可能となっている。   The combustion apparatus of the present invention has a basic configuration that enables switching of the number of combustion stages corresponding to the combustion region by switching the open / close state of the fuel valve. That is, the combustion apparatus according to the present invention not only changes the size of the flame in the combustion region currently in combustion, but also burns a new combustion region (expansion of the combustion region) in addition to the combustion region currently in combustion. Conversely, instead of the current combustion region, combustion is performed in a smaller combustion region or a part of the current combustion region is made into a non-combustion state (combustion region reduction), and the required amount of heat (also called target heat amount) It is possible to change to a combustion state according to. Furthermore, the combustion apparatus of the present invention can perform a slow ignition operation from the viewpoint of safety or the like when a new combustion region is burned by switching the number of combustion stages.

ここで、緩点火動作は、先にも説明したように、目標とする熱量に基づいた燃焼動作を実施するための準備動作であり、主に新たに燃焼させる燃焼領域への着火を確実且つ安全にすることを目的としている。そして、従来、緩点火動作は、当該動作への移行のきっかけとなった要求熱量（以下、移行時目標熱量ともいう）を基準に、燃焼段数が決定され、その燃焼段数に付与された所定の熱量で燃焼制御が実施されていた。つまり、従来では、緩点火動作の最中に、いくら要求熱量を変更するための情報（設定温度や出湯量等）が変更されたとしても、当該情報は一切更新されず、移行時目標熱量に基づいた燃焼制御が行われていた。そのため、従来の燃焼装置が給湯装置に採用された場合、先にも説明したように、実際に出湯される湯量に対して、燃焼量が過剰となる場合があり、出湯温度が意図せず高温となってしまう場合があった。   Here, as described above, the slow ignition operation is a preparatory operation for performing the combustion operation based on the target heat quantity, and is mainly reliable and safe to ignite the combustion region to be newly burned. The purpose is to be. Conventionally, in the slow ignition operation, the number of combustion stages is determined on the basis of the required heat quantity (hereinafter also referred to as the target heat quantity at the time of transition) that has caused the transition to the operation, and a predetermined amount given to the combustion stage number is determined. Combustion control was carried out with the amount of heat. In other words, conventionally, no matter how much information for changing the required heat amount (set temperature, amount of hot water, etc.) is changed during the slow ignition operation, the information is not updated at all, and the target heat amount at the time of transition is set. Based on the combustion control. Therefore, when the conventional combustion device is adopted in the hot water supply device, as described above, the combustion amount may be excessive with respect to the amount of hot water actually discharged, and the temperature of the hot water is unintentionally high. There was a case that became.

そこで、請求項１に記載の発明は、緩点火動作において、要求熱量が変更された場合であって、特定の条件が満たされた場合にのみ、移行時目標熱量を新たな目標熱量に変更可能な構成とされている。より詳細には、緩点火動作中に、要求熱量が変更され、その変更された要求熱量（目標熱量）に応じた燃焼段数が、変更前の要求熱量（目標熱量）に応じた燃焼段数よりも小さい場合に、緩点火動作の目標熱量として、変更された要求熱量の燃焼段数を採用することとした。つまり、本発明では、従来のように、移行時目標熱量に応じた燃焼段数を頑なに採用しておくことはなく、変更前の要求熱量であれ、最新の要求熱量であれ、変更前後における要求熱量のうちの最下限の要求熱量に応じた燃焼段数を基準に、緩点火動作の実施が可能である。そのため、本発明の燃焼装置であれば、給湯装置に採用したとしても、従来のように、出湯される湯量に対して、燃焼量が過剰となることがなく、出湯温度が意図せず高温となってしまうおそれがない。つまり、需要者等がカラン等を操作して、設定温度や出湯量を短い期間に幾度となく変更したとしても、従来のような不具合は起き得ない。   Therefore, the invention according to claim 1 can change the target heat amount at the time of transition to a new target heat amount only when the required heat amount is changed in the slow ignition operation and a specific condition is satisfied. It is made into the composition. More specifically, during the mild ignition operation, the required heat amount is changed, and the number of combustion stages according to the changed required heat amount (target heat amount) is greater than the number of combustion stages according to the required heat amount (target heat amount) before the change. In the case where it is small, the number of combustion stages having the changed required heat amount is adopted as the target heat amount of the slow ignition operation. In other words, in the present invention, the number of combustion stages according to the target heat amount at the time of transition is not stubbornly adopted as in the prior art, whether the required heat amount before the change or the latest required heat amount, before and after the change. The mild ignition operation can be performed based on the number of combustion stages corresponding to the lowest required heat quantity of the required heat quantity. Therefore, even if the combustion apparatus of the present invention is used in a hot water supply apparatus, the amount of combustion does not become excessive with respect to the amount of hot water discharged as in the prior art, and the hot water temperature is unintentionally high. There is no fear of becoming. In other words, even if a consumer or the like operates a currant or the like and changes the set temperature and the amount of hot water several times in a short period of time, the conventional problem cannot occur.

本発明の燃焼装置は、緩点火動作には、送風機の回転数を所定の回転数に移行させる移行期間があり、当該移行期間中に、目標とする熱量が新たな要求熱量に変更されて、当該新たな要求熱量に応じた燃焼段数が、前記変更前の要求熱量に応じた燃焼段数よりも小さいことが確認された場合に、当該新たな要求熱量に応じた燃焼段数に応じた緩点火動作が実施されることが推奨される。（請求項２）   In the combustion apparatus of the present invention, the slow ignition operation has a transition period in which the rotational speed of the blower is shifted to a predetermined rotational speed. During the transition period, the target heat amount is changed to a new required heat amount, When it is confirmed that the number of combustion stages corresponding to the new required heat quantity is smaller than the number of combustion stages corresponding to the required heat quantity before the change, the slow ignition operation according to the number of combustion stages corresponding to the new required heat quantity Is recommended to be implemented. (Claim 2)

請求項３に記載の発明は、緩点火動作には、送風機の回転数が概ね所定の回転数に移行した安定期間があり、前記移行期間中に、目標とする熱量が複数回変更され、当該移行期間突入前の要求熱量に応じた燃焼段数と、当該移行期間終了直前の要求熱量に応じた燃焼段数が一致する場合は、安定期間に突入することなく緩点火動作を終了し、前記移行期間突入前の要求熱量に応じた燃焼段数を基準に燃焼動作が実施されることを特徴とする請求項２に記載の燃焼装置である。   In the invention according to claim 3, in the slow ignition operation, there is a stable period in which the rotational speed of the blower has shifted to a predetermined rotational speed, and the target heat quantity is changed a plurality of times during the transition period. When the number of combustion stages according to the required heat quantity before entering the transition period coincides with the number of combustion stages according to the required heat quantity immediately before the end of the transition period, the slow ignition operation ends without entering the stable period, and the transition period The combustion apparatus according to claim 2, wherein the combustion operation is performed based on the number of combustion stages corresponding to the required heat quantity before entering.

かかる構成によれば、緩点火動作の移行期間中に、目標とする熱量が複数回変更されたにも関わらず、移行期間終了直前の要求熱量に応じた燃焼段数が、移行期間突入前の要求熱量に応じた燃焼段数と相違なければ、安定期間に突入することなく緩点火動作を終了し、移行期間突入直後の要求熱量に応じた燃焼段数に応じた燃焼動作が実施される。その結果、不要な段数切換制御の実施によって、燃焼制御が不安定に陥ってしまうことが防止される。   According to such a configuration, the number of combustion stages according to the required heat amount immediately before the end of the transition period is the request before entering the transition period, even though the target heat amount has been changed a plurality of times during the transition period of the slow ignition operation. If it is not different from the number of combustion stages corresponding to the amount of heat, the mild ignition operation is terminated without entering the stable period, and the combustion operation corresponding to the number of combustion stages corresponding to the required amount of heat immediately after entering the transition period is performed. As a result, it is possible to prevent the combustion control from becoming unstable due to unnecessary stage number switching control.

本発明の燃焼装置は、段数切換制御の際に実施される緩点火動作において、目標とする要求熱量を変更可能な構成とされている。そして、緩点火動作においては、目標熱量が幾度となく変更された場合であっても、その変更された要求熱量のうちの下限値の要求熱量に応じた燃焼段数が採用されて、当該燃焼段数に応じた緩点火動作の燃焼が実施されるため、出湯される湯量に対して、燃焼量が過剰となることがなく、出湯温度が意図せず高温となってしまうおそれがない。   The combustion apparatus of the present invention is configured to be able to change the target required heat quantity in the slow ignition operation performed during the stage number switching control. In the mild ignition operation, even if the target heat amount is changed several times, the number of combustion stages corresponding to the required heat amount at the lower limit of the changed required heat amount is adopted, and the number of combustion stages Therefore, the amount of combustion does not become excessive with respect to the amount of hot water discharged, and there is no possibility that the temperature of the discharged hot water becomes unintentionally high.

本発明の実施形態に係る燃焼装置を示す作動原理図である。It is an operation principle figure which shows the combustion apparatus which concerns on embodiment of this invention. 図１の燃焼装置の燃焼動作を行った際の燃焼部の様子を示す概念図であり、燃焼段数１の状態を示す。It is a conceptual diagram which shows the mode of the combustion part at the time of performing the combustion operation | movement of the combustion apparatus of FIG. 1, and shows the state of the combustion stage number 1. FIG. 図１の燃焼装置の燃焼動作を行った際の燃焼部の様子を示す概念図であり、燃焼段数２の状態を示す。It is a conceptual diagram which shows the mode of the combustion part at the time of performing the combustion operation | movement of the combustion apparatus of FIG. 1, and shows the state of the combustion stage number 2. FIG. 図１の燃焼装置の燃焼動作を行った際の燃焼部の様子を示す概念図であり、燃焼段数３の状態を示す。It is a conceptual diagram which shows the mode of the combustion part at the time of performing combustion operation of the combustion apparatus of FIG. 1, and shows the state of the combustion stage number 3. FIG. 図１の燃焼装置の燃焼動作を行った際の燃焼部の様子を示す概念図であり、燃焼段数４の状態を示す。It is a conceptual diagram which shows the mode of the combustion part at the time of performing the combustion operation | movement of the combustion apparatus of FIG. 1, and shows the state of the combustion stage number 4. FIG. 図１の燃焼装置の燃焼動作を行った際の燃焼部の様子を示す概念図であり、燃焼段数５の状態を示す。It is a conceptual diagram which shows the mode of the combustion part at the time of performing combustion operation of the combustion apparatus of FIG. 1, and shows the state of the combustion stage number 5. FIG. 段数切換制御における電磁弁の開閉状態を簡単に示した表であり、各セルは電磁弁の開閉状態の変化を上から下に向けて変化する様を示す。It is the table | surface which showed simply the opening / closing state of the solenoid valve in stage number switching control, and each cell shows that the change of the opening / closing state of a solenoid valve changes from the top to the bottom. 緩点火動作における送風機の回転数とガス二次圧との関係を示すタイムチャートである。It is a time chart which shows the relationship between the rotation speed of an air blower in a low ignition operation, and a gas secondary pressure. 緩点火動作を示すフローチャートである。It is a flowchart which shows a slow ignition operation | movement. 緩点火動作中における給湯端末の操作に基づいた燃焼段数の変化を示すタイムチャートである。It is a time chart which shows the change of the number of combustion stages based on operation of the hot-water supply terminal in slow ignition operation. 緩点火動作を行う場合の段数切換制御を示す概念図である。It is a conceptual diagram which shows the stage number switching control in the case of performing a slow ignition operation | movement. 緩点火動作を行わない場合の段数切換制御を示す概念図である。It is a conceptual diagram which shows the stage number switching control when not performing a slow ignition operation | movement.

以下に、本発明の実施形態に係る燃焼装置１について説明する。
本実施形態の燃焼装置１は、給湯器として使用されるものであり、図示しない給水源から供給される水を加熱する給湯運転の実施が可能な構成である。つまり、本実施形態の燃焼装置１は、その基本構造は公知のそれと同様である。
そこで、まず燃焼装置１の基本構造について説明する。 Below, the combustion apparatus 1 which concerns on embodiment of this invention is demonstrated.
The combustion apparatus 1 according to the present embodiment is used as a hot water heater and has a configuration capable of performing a hot water supply operation for heating water supplied from a water supply source (not shown). That is, the basic structure of the combustion apparatus 1 of the present embodiment is the same as that of a known one.
First, the basic structure of the combustion apparatus 1 will be described.

燃焼装置１は、図１に示すように、供給される燃料ガスを燃焼して燃焼ガスを生成する燃焼部３と、燃焼部３に空気を供給する送風機５と、燃焼ガスの熱エネルギーを回収する熱交換部６とを備え、さらに、燃焼部３に燃料ガスを供給するための燃料供給系統７と、カラン等の給湯端末６０に湯を導く給湯系統８と、熱交換部６で発生したドレンを中和して外部に排水するためのドレン排水系統１０が設けられている。
また、燃焼装置１には、各種機器からの信号を受信したり、各種機器の動作を制御する制御装置２０が備えられている。 As shown in FIG. 1, the combustion device 1 combusts a supplied fuel gas to generate combustion gas, a blower 5 that supplies air to the combustion unit 3, and recovers thermal energy of the combustion gas. Generated in the heat exchange section 6, and further in the fuel supply system 7 for supplying fuel gas to the combustion section 3, the hot water supply system 8 for introducing hot water to a hot water supply terminal 60 such as a currant, and the heat exchange section 6. A drain drainage system 10 is provided for neutralizing drainage and draining it to the outside.
The combustion apparatus 1 is also provided with a control device 20 that receives signals from various devices and controls the operations of the various devices.

燃焼部３は、複数のバーナ１１が備えられ、所定数のバーナ１１が群をなした複数（本実施形態では３つ）のバーナ群２１に区分されている。具体的には、燃焼部３は、２本のバーナ１１で構成された第１バーナ群２１ａと、３本のバーナ１１で構成された第２バーナ群２１ｂと、７本のバーナ１１で構成された第３バーナ群２１ｃを有し、真ん中に配した第１バーナ群２１ａを基準に、その右側に第２バーナ群２１ｂを配し、左側に第３バーナ群２１ｃを配した構成である。そして、各バーナ群２１ａ〜２１ｃには、火炎が形成される燃焼領域Ａ〜Ｃが設けられている。すなわち、真ん中のバーナ群２１ａには、燃焼領域Ａが設けられ、その右側のバーナ群２１ｂには、燃焼領域Ｂが設けられ、左側のバーナ群２１ｃには、燃焼領域Ｃが設けられている。   The combustion unit 3 includes a plurality of burners 11 and is divided into a plurality (three in this embodiment) of burner groups 21 in which a predetermined number of burners 11 form a group. Specifically, the combustion unit 3 includes a first burner group 21 a configured by two burners 11, a second burner group 21 b configured by three burners 11, and seven burners 11. The second burner group 21c is disposed on the right side and the third burner group 21c is disposed on the left side with respect to the first burner group 21a disposed in the middle. And each burner group 21a-21c is provided with combustion area | region AC in which a flame is formed. That is, the middle burner group 21a is provided with a combustion region A, the right burner group 21b is provided with a combustion region B, and the left burner group 21c is provided with a combustion region C.

また、第１バーナ群２１ａの直上には、着火手段（本実施形態ではイグナイタ）２２が配され、第１バーナ群２１ａと第２バーナ群２１ｂの境界付近の直上には、火炎の有無を検知する火炎検知手段（本実施形態ではフレームロッド）２３が配されている。すなわち、本実施形態の燃焼装置１は、着火手段２２に通電して火花を散らせば、第１バーナ群２１ａの燃焼領域Ａに点火することができ、また火炎検知手段２３が通電の有無を検知することで火炎の有無を検知できる構成である。   An ignition means (igniter in the present embodiment) 22 is disposed immediately above the first burner group 21a, and the presence or absence of a flame is detected immediately above the boundary between the first burner group 21a and the second burner group 21b. Flame detecting means (a frame rod in the present embodiment) 23 is arranged. That is, the combustion apparatus 1 of the present embodiment can ignite the combustion region A of the first burner group 21a by energizing the ignition means 22 to disperse sparks, and the flame detection means 23 determines whether or not energization is present. It is the structure which can detect the presence or absence of a flame by detecting.

送風機５は、公知のそれと同様であり、図示しないモータと羽根車を有し、燃焼部３における燃焼状態に応じて回転数を変化させて、送風量及び送風圧を調整できるものである。   The blower 5 is the same as that known in the art, has a motor and an impeller (not shown), and can adjust the blowing amount and the blowing pressure by changing the rotation speed according to the combustion state in the combustion unit 3.

熱交換部６は、給湯系統８の一部を形成するものであり、湯水が流通する通水管２５を有する。そして、この熱交換部６は、燃焼部３で生成された燃焼ガスが通過する排気ガス流路２６の中途に配される。すなわち、熱交換部６は、通水管２５を流れる湯水と、排気ガス流路２６を流れる燃焼ガスとを熱交換させて、通水管２５内の湯水を昇温させるものである。   The heat exchanging unit 6 forms part of the hot water supply system 8 and has a water conduit 25 through which hot water flows. And this heat exchange part 6 is distribute | arranged to the middle of the exhaust gas flow path 26 through which the combustion gas produced | generated by the combustion part 3 passes. That is, the heat exchanging unit 6 exchanges heat between the hot water flowing through the water pipe 25 and the combustion gas flowing through the exhaust gas passage 26 to raise the temperature of the hot water in the water pipe 25.

燃料供給系統７は、図１に示すように、図示しない燃料供給源から供給される燃料ガスを燃焼部３に導く気体用の経路であり、燃料供給管３５を備えている。そして、燃料供給管３５には、その中途に元ガス電磁弁３６と、ガス比例弁３７と、複数（本実施形態ではバーナ群２１の数と同数）の電磁弁（燃料弁）３８ａ〜３８ｃとが設けられている。より詳細には、燃料供給管３５は、主配管４０と、主配管４０から分岐した３つの分岐配管４１ａ〜４１ｃを有し、主配管４０に元ガス電磁弁３６とガス比例弁３７が設けられ、主配管４０と分岐配管４１ａ〜４１ｃとの境界部分に電磁弁３８ａ〜３８ｃが設けられている。すなわち、燃料供給系統７は、各バーナ群２１ａ〜２１ｃに供給する燃料ガスを、電磁弁３８ａ〜３８ｃの開閉制御によって制限できる構成である。換言すれば、燃焼装置１は、電磁弁３８ａ〜３８ｃによって、各燃焼領域Ａ〜Ｃを独立的に燃焼制御することが可能である。   As shown in FIG. 1, the fuel supply system 7 is a gas path that guides fuel gas supplied from a fuel supply source (not shown) to the combustion unit 3, and includes a fuel supply pipe 35. The fuel supply pipe 35 includes an original gas solenoid valve 36, a gas proportional valve 37, and a plurality of (in the present embodiment, the same number as the number of burner groups 21) solenoid valves (fuel valves) 38a to 38c. Is provided. More specifically, the fuel supply pipe 35 includes a main pipe 40 and three branch pipes 41 a to 41 c branched from the main pipe 40, and the main gas solenoid valve 36 and the gas proportional valve 37 are provided in the main pipe 40. The solenoid valves 38a to 38c are provided at the boundary portions between the main pipe 40 and the branch pipes 41a to 41c. That is, the fuel supply system 7 is configured to be able to limit the fuel gas supplied to the burner groups 21a to 21c by opening / closing control of the electromagnetic valves 38a to 38c. In other words, the combustion apparatus 1 can independently control the combustion regions A to C by the electromagnetic valves 38a to 38c.

給湯系統８は、図１に示すように、図示しない給水源から供給される水を給湯端末６０に導く液体用の経路であり、熱交換部６の前後に設けられた入水管４３及び出湯管４５と、熱交換部６をバイパスするバイパス管４６とを有する。すなわち、給湯系統８は、入水管４３を流通する水を熱交換部６に導入し、熱交換部６で昇温させて湯を生成し、その湯を出湯管４５においてバイパス管４６を通過した水と混合して、所望の設定温度の湯を給湯端末６０から出湯することができる流路である。
なお、入水管４３には、入水量を検知する入水側流量センサ５１と、入水温度を検知する入水側温度センサ５２とが設けられ、出湯管４５には、出湯温度を検知する出湯側温度センサ５３と、出湯量の調整が可能な出湯側流量調整弁５５が設けられている。 As shown in FIG. 1, the hot water supply system 8 is a liquid path that guides water supplied from a water supply source (not shown) to the hot water supply terminal 60, and includes a water inlet pipe 43 and a hot water pipe provided before and after the heat exchange unit 6. 45 and a bypass pipe 46 that bypasses the heat exchange section 6. That is, the hot water supply system 8 introduces the water flowing through the inlet pipe 43 into the heat exchange unit 6, raises the temperature in the heat exchange unit 6 to generate hot water, and passes the hot water through the bypass pipe 46 in the hot water discharge pipe 45. It is a flow path that can mix hot water and discharge hot water having a desired set temperature from the hot water supply terminal 60.
The incoming water pipe 43 is provided with an incoming water flow rate sensor 51 for detecting the incoming water amount and an incoming water temperature sensor 52 for detecting the incoming water temperature, and the hot water outlet pipe 45 is provided with a hot water side temperature sensor for detecting the hot water temperature. 53 and a hot water flow rate adjusting valve 55 capable of adjusting the amount of hot water is provided.

次に、本実施形態の燃焼装置１における給湯運転について説明する。
給湯運転は、需要者が給湯端末６０を操作する等した場合に発生する給湯要求に応じて、所望の設定温度の湯を給湯端末６０から出湯させることができる運転モードである。具体的に説明すると、給湯端末６０が操作されると、まず、図示しない給水源から入水管４３に水が供給される。このとき、入水側流量センサ５１によって、入水管４３を通過する入水量が検知される。そして、入水側流量センサ５１によって、入水管４３を通過する水が一定量以上、つまり燃焼部３において燃焼させることが可能な最低限の流量（MOQ）以上であることが確認されると（給湯要求有り）、燃焼部３における燃焼動作が実施され、昇温した湯が給湯端末６０から吐き出される。 Next, the hot water supply operation in the combustion apparatus 1 of the present embodiment will be described.
The hot water supply operation is an operation mode in which hot water having a desired set temperature can be discharged from the hot water supply terminal 60 in response to a hot water supply request generated when a consumer operates the hot water supply terminal 60 or the like. More specifically, when the hot water supply terminal 60 is operated, first, water is supplied to the water intake pipe 43 from a water supply source (not shown). At this time, the incoming water flow rate sensor 51 detects the amount of incoming water that passes through the incoming water pipe 43. Then, when it is confirmed by the incoming water flow rate sensor 51 that the water passing through the incoming water pipe 43 is equal to or greater than a certain amount, that is, the minimum flow rate (MOQ) that can be combusted in the combustion section 3 (hot water supply) There is a request), the combustion operation in the combustion section 3 is performed, and the hot water whose temperature has been raised is discharged from the hot water supply terminal 60.

より詳細には、燃焼動作では、要求された熱量に応じた燃焼量となるように、従来公知のＦＦ制御とＦＢ制御によって燃焼が制御される。すなわち、燃焼装置１は、給湯要求を確認すると、まず、入水管４３で検知された入水温度及び単位時間当たりの入水量に基づいて、予め設定された設定温度まで加熱するのに必要な燃焼量（ＦＦ目標燃焼量）を演算する。そして、前記ＦＦ目標燃焼量となるように、燃料ガスの供給量（ガス二次圧）及び送風量等を制御して燃焼動作を実施する（ＦＦ制御）。すなわち、燃焼初期においては、入水量と入水温度に基づいた、ＦＦ制御によって燃焼量が制御される。   More specifically, in the combustion operation, combustion is controlled by conventionally known FF control and FB control so that the combustion amount corresponds to the required amount of heat. That is, when the combustion apparatus 1 confirms the hot water supply request, first, based on the incoming water temperature detected by the incoming water pipe 43 and the incoming water amount per unit time, the combustion amount required for heating to a preset temperature. (FF target combustion amount) is calculated. Then, the fuel gas supply amount (secondary gas pressure) and the blown air amount are controlled so as to achieve the FF target combustion amount, and the combustion operation is performed (FF control). That is, at the initial stage of combustion, the combustion amount is controlled by the FF control based on the incoming water amount and the incoming water temperature.

そして、燃焼初期の時期が経過して、ＦＦ制御によって加熱された湯の温度（出湯温度）が検知されるようになれば、ＦＦ制御に加えて、出湯管４５で検知された出湯温度を加味して、水の加熱に必要な燃焼量（ＦＢ目標燃焼量）を新たに演算する。すなわち、燃焼初期の時期が過ぎれば、前記ＦＢ目標燃焼量となるように、燃料ガスの供給及び送風量等が制御された燃焼動作が実施される。   And if the time of the early stage of combustion passes and the temperature (tapping water temperature) of the hot water heated by FF control will be detected, in addition to FF control, the tapping temperature detected with the tapping pipe 45 will be considered. Then, a new combustion amount (FB target combustion amount) necessary for heating the water is calculated. That is, when the initial combustion period has passed, a combustion operation is performed in which the supply of fuel gas, the amount of blown air, and the like are controlled to achieve the FB target combustion amount.

このように、給湯運転では、その動作が開始されてから終了するまでの間、ＦＦ制御やＦＢ制御によって適切な燃焼量に適宜変更されながら燃焼動作が実施されて、所望の設定温度の湯が給湯端末６０を介して需要者に供給される。   Thus, in the hot water supply operation, the combustion operation is performed while appropriately changing to an appropriate combustion amount by FF control or FB control from the start to the end of the operation, and hot water having a desired set temperature is obtained. It is supplied to consumers via the hot water supply terminal 60.

続いて、給湯運転時における燃焼部３の基本的機能について説明する。
本実施形態の燃焼装置１は、前記したように、３つのバーナ群２１ａ〜２１ｃによって構成された燃焼部３を備えている。そして、各バーナ群２１ａ〜２１ｃは、それぞれに対応するように分岐配管４１ａ〜４１ｃが配されている。また、各分岐配管４１ａ〜４１ｃのそれぞれには、導入される燃料ガスを制限するべく、電磁弁３８ａ〜３８ｃが配されている。 Then, the basic function of the combustion part 3 at the time of hot water supply operation is demonstrated.
As described above, the combustion apparatus 1 of the present embodiment includes the combustion unit 3 configured by the three burner groups 21a to 21c. And the branch pipes 41a-41c are arranged so that each burner group 21a-21c may correspond, respectively. In addition, electromagnetic valves 38a to 38c are arranged in each of the branch pipes 41a to 41c in order to limit the fuel gas introduced.

すなわち、本実施形態の燃焼装置１は、ガス比例弁３７の開度調整だけでなく、電磁弁３８ａ〜３８ｃの開閉状態の切り換え（燃焼段数の切換制御）によっても、燃焼量の制御が可能となっている。つまり、燃焼段数の切換制御（以下、単に段数切換制御ともいう）を実施することによって、燃焼領域の拡張又は減縮が可能である。そして、本実施形態では、切り換え可能な３つの燃焼領域Ａ〜Ｃが用意されている。そして、その燃焼領域Ａ〜Ｃを組み合わせて、５段階の燃焼能力の段数（以下、単に燃焼段数ともいう）に切り換えることが可能である。
なお、各燃焼段数は、燃焼能力の小さい側から、燃焼領域Ａのみを燃焼する燃焼段数１と、燃焼領域Ｂのみを燃焼する燃焼段数２と、燃焼領域Ａ及び燃焼領域Ｂを燃焼する燃焼段数３と、燃焼領域Ａ及び燃焼領域Ｃを燃焼する燃焼段数４と、燃焼領域Ａ、燃焼領域Ｂ、及び、燃焼領域Ｃを燃焼する燃焼段数５である。 That is, the combustion apparatus 1 of the present embodiment can control the combustion amount not only by adjusting the opening degree of the gas proportional valve 37 but also by switching the open / close state of the electromagnetic valves 38a to 38c (switching control of the number of combustion stages). It has become. That is, the combustion region can be expanded or reduced by performing combustion stage number switching control (hereinafter also simply referred to as stage number switching control). And in this embodiment, three combustion area | region AC which can be switched is prepared. Then, by combining the combustion regions A to C, it is possible to switch to the number of stages of five stages of combustion capacity (hereinafter also simply referred to as the number of combustion stages).
It should be noted that the number of combustion stages includes the number of combustion stages 1 for burning only the combustion area A, the number of combustion stages 2 for burning only the combustion area B, and the number of combustion stages for burning the combustion area A and the combustion area B from the side with the smaller combustion capacity. 3, the combustion stage number 4 for burning the combustion region A and the combustion region C, and the combustion stage number 5 for burning the combustion region A, the combustion region B, and the combustion region C.

ここで、各燃焼段数１〜５について説明しておく。
まず、給湯運転の実施を待機した状態、つまり全ての燃焼領域Ａ〜Ｃが非燃焼の状態において、需要者等が給湯端末６０を操作して、目標燃焼量に応じた各燃焼段数１〜５に移行する場合について説明する。 Here, each combustion stage number 1-5 is demonstrated.
First, in a state where standby for the hot water supply operation is performed, that is, in a state where all the combustion regions A to C are non-combustion, a consumer or the like operates the hot water supply terminal 60 to set the number of combustion stages 1 to 5 corresponding to the target combustion amount. The case of shifting to will be described.

（燃焼段数１）
燃焼段数１では、図２に示すように、燃焼領域Ａが設けられたバーナ群２１ａを用いて燃焼動作を実施する。すなわち、目標燃焼量が演算され、燃焼段数１で燃焼制御することが決定すると、バーナ群２１ａに対応する電磁弁３８ａを開成し、着火手段２２（図１）によってバーナ群２１ａに属するバーナ１１に点火される。このとき、ガス比例弁３７は、燃焼段数１の緩点火動作に対応した開度（燃焼段数ごとに設定された固定開度）に調整される。すなわち、バーナ群２１ａに供給される燃料ガスの流量（ガス二次圧）は、燃焼段数１におけるガス二次圧の制御範囲内で定められる。そして、緩点火動作が終了すれば、ガス比例弁３７の開度を実際の目標燃焼量に基づいた開度に調整して、燃焼領域Ａのみで通常の燃焼制御を行う。
なお、燃焼段数１では、燃焼領域Ｂに対応した電磁弁３８ｂと、燃焼領域Ｃに対応した電磁弁３８ｃは閉止された状態が維持される。 (Number of combustion stages 1)
In the number of combustion stages 1, as shown in FIG. 2, the combustion operation is performed using the burner group 21a provided with the combustion region A. That is, when the target combustion amount is calculated and it is determined that the combustion control is performed with the number of combustion stages 1, the electromagnetic valve 38a corresponding to the burner group 21a is opened, and the ignition means 22 (FIG. 1) applies the burner 11 belonging to the burner group 21a. Ignited. At this time, the gas proportional valve 37 is adjusted to an opening degree corresponding to the slow ignition operation with the combustion stage number 1 (a fixed opening degree set for each combustion stage number). That is, the flow rate (gas secondary pressure) of the fuel gas supplied to the burner group 21a is determined within the control range of the gas secondary pressure in the number of combustion stages 1. When the slow ignition operation ends, the opening of the gas proportional valve 37 is adjusted to an opening based on the actual target combustion amount, and normal combustion control is performed only in the combustion region A.
In the combustion stage number 1, the electromagnetic valve 38b corresponding to the combustion region B and the electromagnetic valve 38c corresponding to the combustion region C are kept closed.

（燃焼段数２）
燃焼段数２では、図３に示すように、燃焼領域Ｂが設けられたバーナ群２１ｂで燃焼動作を実施する。本実施形態では、目標燃焼量が演算され、燃焼段数２で燃焼制御することが決定すると、まずバーナ群２１ａに対応する電磁弁３８ａを開成し、着火手段２２（図１）によってバーナ群２１ａに属するバーナ１１に点火される。このとき、ガス比例弁３７は、燃焼段数２の緩点火動作に対応した固定開度に調整される。すなわち、バーナ群２１ａにおけるガス二次圧は、燃焼段数２におけるガス二次圧の制御範囲内で定められる。そして、燃焼領域Ａが燃焼した状態で、バーナ群２１ｂに対応する電磁弁３８ｂを開成する。すると、燃焼領域Ｂには、燃焼領域Ａの火炎が火種となって火移りが起こり、当該燃焼領域Ｂにおける緩点火動作が開始される。そして、火移りによって、燃焼領域Ｂに完全に火炎が形成された状態になれば、燃焼領域Ａに対応した電磁弁３８ａを閉止すると同時に、ガス比例弁３７の開度を実際の目標燃焼量に基づいた開度に調整して、燃焼領域Ｂのみで通常の燃焼制御を行う。
なお、燃焼段数２では、燃焼領域Ａに対応した電磁弁３８ａと、燃焼領域Ｃに対応した電磁弁３８ｃは閉止された状態が維持される（火移り時は除く）。 (Number of combustion stages 2)
In the number of combustion stages 2, as shown in FIG. 3, the combustion operation is performed in the burner group 21b in which the combustion region B is provided. In this embodiment, when the target combustion amount is calculated and it is determined that the combustion control is performed with 2 combustion stages, first, the solenoid valve 38a corresponding to the burner group 21a is opened, and the ignition means 22 (FIG. 1) causes the burner group 21a. The burner 11 to which it belongs is ignited. At this time, the gas proportional valve 37 is adjusted to a fixed opening degree corresponding to the slow ignition operation with two combustion stages. That is, the gas secondary pressure in the burner group 21a is determined within the control range of the gas secondary pressure in the number of combustion stages 2. And the solenoid valve 38b corresponding to the burner group 21b is opened in the state which the combustion area | region A burned. Then, in the combustion region B, the flame in the combustion region A becomes a fire type and fire transfer occurs, and the slow ignition operation in the combustion region B is started. When the flame is completely formed in the combustion region B due to the fire transfer, the solenoid valve 38a corresponding to the combustion region A is closed and the opening of the gas proportional valve 37 is set to the actual target combustion amount. The normal opening control is performed only in the combustion region B by adjusting the opening degree based on the opening degree.
Note that, in the combustion stage number 2, the electromagnetic valve 38a corresponding to the combustion region A and the electromagnetic valve 38c corresponding to the combustion region C are kept closed (except at the time of burning).

（燃焼段数３）
燃焼段数３では、図４に示すように、燃焼領域Ａ、Ｂの双方に設けられたバーナ群２１ａ、２１ｂで燃焼動作を実施する。本実施形態では、目標燃焼量が演算されて、燃焼段数３で燃焼制御することが決定すると、燃焼領域Ａと燃焼領域Ｂとの間で火移りが行われるまで、前記した燃焼段数２と同様の動作を実施する。すなわち、燃焼段数３では、燃焼領域Ｂに火移りが行われた後、燃焼領域Ａに対応した電磁弁３８ａを閉止することはなく、燃焼領域Ａと燃焼領域Ｂの双方で緩点火動作が行われた状態となる。なおこのとき、ガス比例弁３７は、燃焼段数３の緩点火動作に対応した固定開度に調整されている。すなわち、バーナ群２１ａ、２１ｂにおけるガス二次圧は、燃焼段数３におけるガス二次圧の制御範囲内で定められる。そして、緩点火動作が終了すれば、ガス比例弁３７の開度を実際の目標燃焼量に基づいた開度に調整して、燃焼領域Ａ、Ｂの双方で通常の燃焼制御を行う。
なお、燃焼段数３では、燃焼領域Ｃに対応した電磁弁３８ｃは閉止された状態が維持される。 (Number of combustion stages 3)
In the number of combustion stages 3, as shown in FIG. 4, the combustion operation is performed by the burner groups 21a and 21b provided in both the combustion regions A and B. In the present embodiment, when the target combustion amount is calculated and it is determined that the combustion control is performed with the number of combustion stages 3, the same as the number of combustion stages 2 described above until the fire transfer is performed between the combustion area A and the combustion area B. Perform the operation. That is, at the number of combustion stages 3, after the ignition is transferred to the combustion region B, the solenoid valve 38a corresponding to the combustion region A is not closed, and the slow ignition operation is performed in both the combustion region A and the combustion region B. It becomes a broken state. At this time, the gas proportional valve 37 is adjusted to a fixed opening degree corresponding to the slow ignition operation of the combustion stage number 3. That is, the gas secondary pressure in the burner groups 21a and 21b is determined within the control range of the gas secondary pressure in the number of combustion stages 3. When the slow ignition operation ends, the opening of the gas proportional valve 37 is adjusted to an opening based on the actual target combustion amount, and normal combustion control is performed in both the combustion regions A and B.
In the combustion stage number 3, the solenoid valve 38c corresponding to the combustion region C is kept closed.

（燃焼段数４）
燃焼段数４では、図５に示すように、燃焼領域Ａ、Ｃに設けられたバーナ群２１ａ、２１ｃで燃焼動作を実施する。本実施形態では、目標燃焼量が演算されて、燃焼段数４で燃焼制御することが決定すると、前記した燃焼段数３と概ね同様の動作を実施する。すなわち、燃焼段数４では、燃焼領域Ａと燃焼領域Ｃとの間で火移りを行い、燃焼領域Ａと燃焼領域Ｃの双方で緩点火動作を行う。具体的には、燃焼領域Ａに点火された後、燃焼領域Ｃに対応する電磁弁３８ｃを開成し、当該燃焼領域Ｃに対して火移りによる点火を行う。なおこのとき、ガス比例弁３７は、燃焼段数４の緩点火動作に対応した固定開度に調整されている。つまり、バーナ群２１ａ、２１ｃにおけるガス二次圧は、燃焼段数４におけるガス二次圧の制御範囲内で定められる。そして、緩点火動作が終了すれば、ガス比例弁３７の開度を実際の目標燃焼量に基づいた開度に調整して、燃焼領域Ａ、Ｃの双方で通常の燃焼制御を行う。
なお、燃焼段数４では、燃焼領域Ｂに対応した電磁弁３８ｂは閉止された状態が維持される。 (Combustion stage number 4)
In the number of combustion stages 4, as shown in FIG. 5, the combustion operation is performed by the burner groups 21a and 21c provided in the combustion regions A and C. In the present embodiment, when the target combustion amount is calculated and it is determined that the combustion control is performed with the combustion stage number 4, the operation substantially similar to the above-described combustion stage number 3 is performed. That is, in the number of combustion stages 4, the fire is transferred between the combustion region A and the combustion region C, and the slow ignition operation is performed in both the combustion region A and the combustion region C. Specifically, after the combustion region A is ignited, the solenoid valve 38c corresponding to the combustion region C is opened, and the combustion region C is ignited by fire transfer. At this time, the gas proportional valve 37 is adjusted to a fixed opening degree corresponding to the slow ignition operation with four combustion stages. That is, the gas secondary pressure in the burner groups 21 a and 21 c is determined within the control range of the gas secondary pressure in the number of combustion stages 4. When the slow ignition operation ends, the opening of the gas proportional valve 37 is adjusted to an opening based on the actual target combustion amount, and normal combustion control is performed in both the combustion regions A and C.
Note that, in the combustion stage number 4, the solenoid valve 38b corresponding to the combustion region B is kept closed.

（燃焼段数５）
燃焼段数５では、図６に示すように、燃焼領域Ａ、Ｂ、Ｃに設けられたバーナ群２１ａ、２１ｂ、２１ｃで燃焼動作を実施する。つまり、燃焼段数５では、燃焼部３に設けられた全ての燃焼領域Ａ〜Ｃが燃焼制御された状態となる。すなわち、本実施形態では、目標燃焼量が演算され、燃焼段数５で燃焼制御することが決定すると、全ての燃焼領域Ａ〜Ｃで緩点火動作を行い、その後、通常の燃焼制御を行う。具体的には、前記燃焼段数１〜４と同様、まず着火手段２２によって、燃焼領域Ａに対応するバーナ群２１ａのバーナ１１に点火する。そして、燃焼領域Ａが燃焼した状態で、燃焼領域Ｂ及び燃焼領域Ｃの電磁弁３８ｂ、３８ｃを開成して、当該燃焼領域Ｂ及び燃焼領域Ｃに対して火移りによる点火を行う。なおこのとき、ガス比例弁３７は、燃焼段数５の緩点火動作に対応した固定開度に調整されている。すなわち、バーナ群２１ａ〜２１ｃにおけるガス二次圧は、燃焼段数５におけるガス二次圧の制御範囲内で定められる。そして、緩点火動作が終了すれば、ガス比例弁３７の開度を実際の目標燃焼量に基づいた開度に調整して、燃焼領域Ａ〜Ｃの全てで通常の燃焼制御を行う。
以上が、給湯運転の実施を待機した状態から燃焼部３を作動させる場合の説明である。 (Number of combustion stages 5)
In the number of combustion stages 5, as shown in FIG. 6, the combustion operation is performed in the burner groups 21a, 21b, and 21c provided in the combustion regions A, B, and C. That is, at the number of combustion stages 5, all the combustion regions A to C provided in the combustion unit 3 are in a state in which combustion is controlled. That is, in the present embodiment, when the target combustion amount is calculated and it is determined that the combustion control is performed with the number of combustion stages 5, the slow ignition operation is performed in all the combustion regions A to C, and then the normal combustion control is performed. Specifically, as with the number of combustion stages 1 to 4, first, the ignition means 22 ignites the burners 11 of the burner group 21a corresponding to the combustion region A. Then, in a state where the combustion region A is combusted, the solenoid valves 38b and 38c in the combustion region B and the combustion region C are opened, and ignition by fire transfer is performed on the combustion region B and the combustion region C. At this time, the gas proportional valve 37 is adjusted to a fixed opening degree corresponding to the slow ignition operation with 5 combustion stages. That is, the gas secondary pressure in the burner groups 21 a to 21 c is determined within the control range of the gas secondary pressure in the number of combustion stages 5. When the slow ignition operation ends, the opening of the gas proportional valve 37 is adjusted to an opening based on the actual target combustion amount, and normal combustion control is performed in all the combustion regions A to C.
The above is the description of the case where the combustion unit 3 is operated from the state where the hot water supply operation is awaited.

また、既に給湯運転中の状態において、需要者等が給湯端末６０を操作すると、新たな目標燃焼量に変更される場合があり、その場合、新たな燃焼段数で給湯運転を継続する場合がある。すなわち、給湯運転中に目標燃焼量が変更された場合においても、燃焼能力の段数切換制御が実施される。そして、本実施形態では、この場合においても、基本的には、前記した燃焼段数１〜５のうちのいずれかと同様の燃焼動作が行われる。   In addition, when a consumer or the like operates the hot water supply terminal 60 in a state where the hot water supply operation is already being performed, the target combustion amount may be changed to a new target combustion amount. In this case, the hot water supply operation may be continued with a new number of combustion stages. . That is, even when the target combustion amount is changed during the hot water supply operation, the stage switching control of the combustion capacity is performed. In this embodiment, even in this case, basically, a combustion operation similar to any one of the above-described number of combustion stages 1 to 5 is performed.

例えば、現在燃焼段数１の状態で燃焼動作が行われており、その状態から燃焼段数３に燃焼状態を移行する場合においては、着火手段２２による燃焼領域Ａへの点火を行わない点を除けば、前記した燃焼段数３での燃焼制御とほぼ同様の動作が実施される。すなわち、給湯運転中に目標燃焼量が変更されて、燃焼段数３への移行が決定すると、まず、ガス比例弁３７の開度を燃焼段数３の緩点火動作用の固定開度に調整する。その状態で、燃焼領域Ｂに対応する電磁弁３８ｂを開成して、燃焼領域Ａと燃焼領域Ｂとの間で火移りを行い、双方の燃焼領域Ａ、Ｂで緩点火動作を実施する。そして、緩点火動作が終了すれば、ガス比例弁３７の開度を実際の目標燃焼量に基づいた開度に調整して、燃焼領域Ａ、Ｂの双方で通常の燃焼制御を行う。
また、燃焼段数２→燃焼段数５、燃焼段数４→燃焼段数２等、いずれの状態から段数切換制御を行っても同様の動作が行われる。すなわち、給湯運転中の段数切換制御においては、重複した説明を避けるため、説明を省略し、図７の表に示す。 For example, when the combustion operation is currently performed in the state of the combustion stage number 1 and the combustion state is shifted from the state to the combustion stage number 3, except that the ignition means 22 does not ignite the combustion region A. The operation similar to the combustion control at the number of combustion stages 3 is performed. That is, when the target combustion amount is changed during the hot water supply operation and the shift to the combustion stage number 3 is determined, first, the opening degree of the gas proportional valve 37 is adjusted to a fixed opening degree for the slow ignition operation with the combustion stage number 3. In this state, the solenoid valve 38b corresponding to the combustion region B is opened, the fire is transferred between the combustion region A and the combustion region B, and the slow ignition operation is performed in both the combustion regions A and B. When the slow ignition operation ends, the opening of the gas proportional valve 37 is adjusted to an opening based on the actual target combustion amount, and normal combustion control is performed in both the combustion regions A and B.
Further, the same operation is performed regardless of the stage number switching control from any state such as the number of combustion stages 2 → the number of combustion stages 5 and the number of combustion stages 4 → the number of combustion stages 2. That is, in the stage number switching control during the hot water supply operation, the description is omitted and the table shown in FIG.

続いて、給湯運転時における燃焼部３の特徴的機能について説明する。
本実施形態の燃焼装置１では、前記したように、段数切換制御を行って、新たに燃焼領域を燃焼させる場合には、緩点火動作が実施される。この緩点火動作は、ガス比例弁３７の開度を、比較的小さなガス二次圧に調整して、新たに燃焼させる燃焼領域に対して安定的に火移りが行われるようにした動作モードである。 Then, the characteristic function of the combustion part 3 at the time of hot water supply operation is demonstrated.
In the combustion apparatus 1 of the present embodiment, as described above, when the stage number switching control is performed to newly burn the combustion region, the slow ignition operation is performed. This slow ignition operation is an operation mode in which the opening of the gas proportional valve 37 is adjusted to a relatively small gas secondary pressure so that the ignition is stably performed in the combustion region where new combustion is performed. is there.

そして、本実施形態では、緩点火動作が、図８のタイムチャートに示すように、移行期と安定期の二部構成である。すなわち、緩点火動作に移行すると、まず、送風機５のモータの回転数が所定数（燃焼段数ごとに設定された固定の回転数）に向けて移行する移行期（例えば０．１〜１．０秒程度の間）に突入する。このとき、同時にガス比例弁３７の開度が、送風機５の回転数に追従するように調整される。そして、送風機５のモータの回転数が所定数に至り、移行期が終了すると、安定期（例えば０．６〜０．８秒程度の間）に突入する。そして、安定期においては、所定の送風量と、所定のガス二次圧に調整された状態で燃焼制御が実施される。そして、安定期が終了すると同時に、本来の目標燃焼量に応じた燃焼制御が実施される。   In the present embodiment, the slow ignition operation has a two-part configuration of a transition period and a stable period as shown in the time chart of FIG. That is, when shifting to the mild ignition operation, first, a transition period (for example, 0.1 to 1.0) in which the rotational speed of the motor of the blower 5 shifts toward a predetermined number (a fixed rotational speed set for each number of combustion stages). For about a second). At this time, the opening degree of the gas proportional valve 37 is adjusted to follow the rotational speed of the blower 5 at the same time. And when the rotation speed of the motor of the blower 5 reaches a predetermined number and the transition period ends, the motor enters the stable period (for example, between about 0.6 to 0.8 seconds). And in a stable period, combustion control is implemented in the state adjusted to predetermined | prescribed ventilation volume and predetermined | prescribed gas secondary pressure. Then, at the same time when the stable period ends, combustion control corresponding to the original target combustion amount is performed.

また、本実施形態では、緩点火動作が、緩点火動作への突入のきっかけとなった目標燃焼量（以下、移行時燃焼量ともいう）、あるいは、移行期に変更された目標燃焼量を、安定期における制御に反映させるような制御が行われる。つまり、緩点火動作では、移行期における給湯端末６０の操作によって変更される情報（設定温度や出湯量）に基づいて当該緩点火動作モードの制御のための目標燃焼量を更新することが可能である。一方で、本実施形態では、安定期における給湯端末６０の操作は、当該緩点火動作モードのための目標燃焼量を更新することは一切ない。
なお、緩点火動作中においては、移行期あるいは安定期に関わらず、緩点火動作後に行われる通常の燃焼制御のために、入水温度、入水量、並びに、出湯温度等の情報そのものは検出されている。 Further, in the present embodiment, the target combustion amount (hereinafter also referred to as the transition combustion amount) that triggered the slow ignition operation into the slow ignition operation, or the target combustion amount changed in the transition period, Control that reflects the control in the stable period is performed. That is, in the slow ignition operation, it is possible to update the target combustion amount for controlling the slow ignition operation mode based on information (set temperature and amount of hot water) changed by operation of the hot water supply terminal 60 in the transition period. is there. On the other hand, in the present embodiment, the operation of the hot water supply terminal 60 in the stable period does not update the target combustion amount for the slow ignition operation mode at all.
During the slow ignition operation, regardless of the transition period or the stable period, information such as the incoming water temperature, the incoming water amount, and the tapping temperature is detected for normal combustion control performed after the slow ignition operation. Yes.

そして、本実施形態の燃焼装置１では、緩点火動作、特に移行期に幾度となく目標燃焼量が変更された場合であっても、従来のように意図しない高温の湯が出湯しないように、移行期において変更された目標燃焼量に応じた燃焼段数のうち、最下限の燃焼段数で、新たな緩点火動作を行う下限段数優先機能が備えられている。つまり、下限段数優先機能は、安定期における燃焼制御の基準として、移行期における最下限の燃焼段数を使用することを可能とした機能である。
以下、下限段数優先機能を加味した緩点火動作について、図９のフローチャートに従って説明する。 And in the combustion apparatus 1 of this embodiment, even if it is a case where the target combustion amount is changed several times during the slow ignition operation, particularly during the transition period, unintended high temperature hot water does not come out. Of the number of combustion stages according to the target combustion amount changed in the transition period, a lower limit stage number priority function for performing a new slow ignition operation at the lowest number of combustion stages is provided. That is, the lower limit stage number priority function is a function that allows the lowest number of combustion stages in the transition period to be used as a reference for combustion control in the stable period.
Hereinafter, the slow ignition operation with the lower limit stage priority function will be described with reference to the flowchart of FIG.

給湯運転が開始され、給湯端末６０の操作によって目標燃焼量が変更されて、緩点火動作が実施されると、ステップ１からステップ２に移行する。ステップ２では、移行期において目標燃焼量が変更されたか否かが確認される。そして、ステップ２において、目標燃焼量の変更が確認されていれば、ステップ３に移行する。なお、ステップ２において、移行期における目標燃焼量の変更が確認されなければ、ステップ４に移行する。   When the hot water supply operation is started, the target combustion amount is changed by operating the hot water supply terminal 60, and the mild ignition operation is performed, the process proceeds from step 1 to step 2. In step 2, it is confirmed whether or not the target combustion amount has been changed in the transition period. If it is confirmed in step 2 that the target combustion amount has been changed, the process proceeds to step 3. In Step 2, if the change of the target combustion amount in the transition period is not confirmed, the process proceeds to Step 4.

ステップ３では、移行期において変更された最新の目標燃焼量に応じた燃焼段数が、緩点火動作に移行する直前の燃焼段数と同一か否かが確認される。そして、ステップ３において、前記最新の目標燃焼量に応じた燃焼段数が、緩点火動作に移行する直前の燃焼段数と同一でなければ、ステップ４に移行する。   In step 3, it is confirmed whether or not the number of combustion stages according to the latest target combustion amount changed in the transition period is the same as the number of combustion stages immediately before the transition to the slow ignition operation. In step 3, if the number of combustion stages corresponding to the latest target combustion amount is not the same as the number of combustion stages immediately before the transition to the mild ignition operation, the process proceeds to step 4.

ステップ４では、下限段数優先機能による安定期の燃焼制御が実施される。すなわち、ステップ４では、安定期に突入しており、移行期において１又は複数回変更された目標燃焼量に応じた燃焼段数のうち、最下限の燃焼段数を基準とした燃焼制御が実施される。例えば、移行期において、需要者等が、図１０に示すように、燃焼段数４→燃焼段数３→燃焼段数５という具合に燃焼段数の切換を行った場合であれば、最下限の燃焼段数として、燃焼段数３が採用される。すなわち、この場合、安定期は、燃焼段数３に基づいた固定燃焼量で燃焼が行われる。   In step 4, combustion control in the stable period is performed by the lower limit stage number priority function. That is, in step 4, combustion control is performed with reference to the lowest number of combustion stages among the number of combustion stages corresponding to the target combustion amount changed one or more times in the transition period, which has entered the stable period. . For example, in the transition period, as shown in FIG. 10, if the user switches the number of combustion stages such as the number of combustion stages 4 → the number of combustion stages 3 → the number of combustion stages 5, the minimum number of combustion stages is set. A combustion stage number of 3 is employed. That is, in this case, in the stable period, combustion is performed with a fixed combustion amount based on the number of combustion stages 3.

そして、下限段数優先機能による燃焼制御が終了して、安定期が終了すれば（ステップ５）、ステップ６に移行し、実際の目標燃焼量に応じた燃焼段数に基づいた通常の燃焼制御が実施される。具体的には、安定期において給湯端末６０が操作されていなければ（目標燃焼量が変更されていなければ）、移行期における最新の目標燃焼量（前記例によれば、燃焼段数５に対応する目標燃焼量）に基づいた燃焼制御が行われ、安定期において目標燃焼量が変更されていれば、その変更された最新の目標燃焼量に基づいた燃焼制御が行われる。そしてその後は、燃焼装置１が運転されている限り、再びステップ１に戻って、それ以降の動作が繰り返される。   Then, when the combustion control by the lower limit stage number priority function is finished and the stable period is finished (step 5), the process proceeds to step 6 and normal combustion control is performed based on the number of combustion stages according to the actual target combustion amount. Is done. Specifically, if the hot water supply terminal 60 is not operated in the stable period (if the target combustion amount is not changed), the latest target combustion amount in the transition period (according to the above example, corresponds to the number of combustion stages 5). If the target combustion amount is changed during the stable period, the combustion control based on the changed latest target combustion amount is performed. After that, as long as the combustion apparatus 1 is operated, the process returns to step 1 and the subsequent operations are repeated.

なお、ステップ６において、移行期における最新の目標燃焼量と、安定期の基準となった目標燃焼量との間に差があったり、また安定期に変更された最新の目標燃焼量と、安定期の基準となった目標燃焼量との間に差があった場合には、再び燃焼段数を変更する必要があるため、新たに緩点火動作を行い、前記同様の動作が実施された後、通常の燃焼制御が実施される。前記した例によれば、燃焼段数３（移行期における最下限燃焼段数）を基準にした緩点火動作を行った後に、燃焼段数５（移行期における最新目標燃焼量又は安定期における最新目標燃焼量）を基準にした緩点火動作を改めて行い、その後に、通常の燃焼制御に移行する。   In Step 6, there is a difference between the latest target combustion amount in the transition period and the target combustion amount that has become the reference for the stable period, or the latest target combustion amount changed in the stable period and the stable If there is a difference between the target combustion amount that became the reference for the period, it is necessary to change the number of combustion stages again, so a slow ignition operation is newly performed, and the same operation as described above is performed. Normal combustion control is performed. According to the example described above, after performing the mild ignition operation based on the combustion stage number 3 (the lowest combustion stage number in the transition period), the combustion stage number 5 (the latest target combustion quantity in the transition period or the latest target combustion quantity in the stable period). ) Is performed again, and then the normal combustion control is performed.

一方、ステップ３において、移行期において変更された最新の目標燃焼量に応じた燃焼段数が、緩点火動作に移行する直前の燃焼段数と同一の場合においては、ステップ７に移行して、以後の緩点火動作を終了する。すなわち、本実施形態では、移行期における最新の目標燃焼量に応じた燃焼段数と、緩点火動作に移行する直前の燃焼段数とが同一であれば、安定期に突入することなくステップ７に移行して、緩点火動作に移行する直前の燃焼段数で、目標燃焼量に応じた通常の燃焼制御が実施される。   On the other hand, in step 3, when the number of combustion stages according to the latest target combustion amount changed in the transition period is the same as the number of combustion stages immediately before the transition to the mild ignition operation, the process proceeds to step 7 and thereafter. End the slow ignition operation. That is, in this embodiment, if the number of combustion stages according to the latest target combustion amount in the transition period is the same as the number of combustion stages immediately before the transition to the mild ignition operation, the process proceeds to step 7 without entering the stable period. Thus, normal combustion control according to the target combustion amount is performed with the number of combustion stages immediately before the transition to the slow ignition operation.

以上のように、本実施形態の燃焼装置１では、緩点火動作の移行期に幾度となく目標燃焼量が変更されたとしても、その変更された目標燃焼量に応じた燃焼段数のうち、最下限の燃焼段数を安定期における燃焼制御の基準にすることが可能である。そのため、従来のように、緩点火動作時における出湯量や設定温度の変更に起因して、意図しない高温の湯が出湯してしまうおそれがない。   As described above, in the combustion apparatus 1 of the present embodiment, even if the target combustion amount is changed several times during the transition period of the slow ignition operation, among the number of combustion stages corresponding to the changed target combustion amount, It is possible to use the lower limit number of combustion stages as a reference for combustion control in the stable period. Therefore, unlike the conventional case, there is no possibility that unintended high-temperature hot water may be discharged due to a change in the amount of hot water and a set temperature during the slow ignition operation.

また、本実施形態の燃焼装置１は、緩点火動作の移行期に幾度となく目標燃焼量が変更された場合であって、移行期における最新の目標燃焼量に応じた燃焼段数と、緩点火動作に移行する直前の燃焼段数とが同一であれば、安定期以降の動作が省略されるため、不要な緩点火動作の実施によって、燃焼制御が不安定に陥ってしまうことが防止される。   Further, the combustion apparatus 1 of the present embodiment is a case where the target combustion amount is changed several times during the transition period of the slow ignition operation, and the number of combustion stages according to the latest target combustion amount in the transition period, and the mild ignition. If the number of combustion stages immediately before the transition to the operation is the same, the operation after the stable period is omitted, so that it is possible to prevent the combustion control from becoming unstable due to the unnecessary slow ignition operation.

上記実施形態では、緩点火動作を制御するための情報が、移行期においてのみ更新される構成としたが、本発明はこれに限定されず、安定期においても更新される構成であっても構わない。   In the above embodiment, the information for controlling the slow ignition operation is updated only in the transition period. However, the present invention is not limited to this, and may be configured to be updated in the stable period. Absent.

上記実施形態では、３つの燃焼領域Ａ〜Ｃに区分された燃焼部３を備えた燃焼装置１を示したが、本発明はこれに限定されず、２つ又は４つ以上の燃焼領域に区分された燃焼部を備えた燃焼装置であっても構わない。また、同様に、各燃焼領域に対応するバーナ群には、上記実施形態以外の数のバーナ１１が設けられたものであっても構わない。   In the said embodiment, although the combustion apparatus 1 provided with the combustion part 3 divided into three combustion area | region AC was shown, this invention is not limited to this, It divides into two or four or more combustion area | regions It may be a combustion apparatus provided with the made combustion part. Similarly, the burner group corresponding to each combustion region may be provided with a number of burners 11 other than the above embodiment.

上記実施形態では、全てのバーナ群２１ａ〜２１ｃが、いずれかの電磁弁３８ａ〜３８ｃによって、燃料ガスの供給が規制される構成を示したが、本発明はこれに限定されず、少なくともバーナ群２１ａ〜２１ｃのうちのいずれか２つが、電磁弁３８によって、燃料ガスの供給が規制される構成であっても構わない。   In the said embodiment, although all the burner groups 21a-21c showed the structure by which supply of fuel gas is controlled by one of solenoid valves 38a-38c, this invention is not limited to this, At least burner group Any two of 21a to 21c may be configured such that the supply of fuel gas is regulated by the solenoid valve 38.

上記実施形態では、給湯運転のみが実施できる燃焼装置１を示したが、本発明はこれに限定されず、給湯運転に加えて、あるいは、替えて、風呂落とし込み運転や追い焚き運転、並びに、暖房運転等の実施が可能な燃焼装置であっても構わない。   In the above embodiment, the combustion apparatus 1 capable of performing only the hot water supply operation has been shown. However, the present invention is not limited to this, and in addition to or instead of the hot water supply operation, the bath dropping operation, the reheating operation, and the heating are performed. It may be a combustion device capable of performing operation or the like.

１ 燃焼装置
３ 燃焼部
５ 送風機
６ 熱交換部
７ 燃料供給系統
８ 給湯系統
１１ バーナ
２０ 制御装置
２１ バーナ群
３７ ガス比例弁
３８ 電磁弁（燃料弁）
Ａ 燃焼領域
Ｂ 燃焼領域
Ｃ 燃焼領域 DESCRIPTION OF SYMBOLS 1 Combustion device 3 Combustion part 5 Blower 6 Heat exchange part 7 Fuel supply system 8 Hot water supply system 11 Burner 20 Control apparatus 21 Burner group 37 Gas proportional valve 38 Solenoid valve (fuel valve)
A Combustion region B Combustion region C Combustion region

Claims (3)

１又は複数のバーナによって形成されたバーナ群を複数有し、さらに送風機と、少なくとも２つのバーナ群のそれぞれに対応するように設けられた燃料弁とを備え、要求される熱量の大きさに応じて、燃料弁の開閉状態を切り換えて燃焼領域に相当する燃焼段数を切り換える段数切換制御の実施が可能であり、要求される熱量が変更されて、段数切換制御によって燃料弁が開成された場合には、当該燃料弁に対応した燃焼領域のバーナ群は、所定の熱量で燃焼する緩点火動作を行い、その後、前記変更された要求熱量に応じた燃焼動作の実施を可能とする燃焼装置であって、
緩点火動作では、燃焼段数ごとに設定された所定の熱量に応じた燃焼制御が行われるものであり、緩点火動作の最中に、目標とする熱量が新たな要求熱量に変更されて、当該新たな要求熱量に応じた燃焼段数が、当該変更前の目標とする要求熱量に応じた燃焼段数よりも小さいことが確認された場合には、当該新たな要求熱量に応じた燃焼段数に応じた緩点火動作が実施されることを特徴とする燃焼装置。 It has a plurality of burner groups formed by one or a plurality of burners, further includes a blower and a fuel valve provided to correspond to each of at least two burner groups, and according to the required amount of heat Therefore, it is possible to perform stage number switching control that switches the opening / closing state of the fuel valve to switch the number of combustion stages corresponding to the combustion region, and when the required amount of heat is changed and the fuel valve is opened by the stage number switching control. The burner group in the combustion region corresponding to the fuel valve is a combustion device that performs a slow ignition operation in which combustion is performed with a predetermined amount of heat, and thereafter enables a combustion operation in accordance with the changed required heat amount. And
In the slow ignition operation, combustion control is performed according to a predetermined amount of heat set for each number of combustion stages. During the mild ignition operation, the target heat amount is changed to a new required heat amount, When it is confirmed that the number of combustion stages corresponding to the new required heat quantity is smaller than the number of combustion stages corresponding to the target required heat quantity before the change, the number of combustion stages corresponding to the new required heat quantity is determined. A combustion apparatus characterized in that a slow ignition operation is performed. 緩点火動作には、送風機の回転数を所定の回転数に移行させる移行期間があり、当該移行期間中に、目標とする熱量が新たな要求熱量に変更されて、当該新たな要求熱量に応じた燃焼段数が、前記変更前の要求熱量に応じた燃焼段数よりも小さいことが確認された場合に、当該新たな要求熱量に応じた燃焼段数に応じた緩点火動作が実施されることを特徴とする請求項１に記載の燃焼装置。   The slow ignition operation has a transition period in which the rotational speed of the blower is shifted to a predetermined rotational speed. During the transition period, the target heat amount is changed to a new required heat amount, and the new required heat amount is changed. When it is confirmed that the number of combustion stages is smaller than the number of combustion stages corresponding to the required amount of heat before the change, a slow ignition operation is performed according to the number of combustion stages corresponding to the new required amount of heat. The combustion apparatus according to claim 1. 緩点火動作には、送風機の回転数が概ね所定の回転数に移行した安定期間があり、
前記移行期間中に、目標とする熱量が複数回変更され、当該移行期間突入前の要求熱量に応じた燃焼能力の段数と、当該移行期間終了直前の要求熱量に応じた燃焼能力の段数が一致する場合は、安定期間に突入することなく緩点火動作を終了し、前記移行期間突入前の要求熱量に応じた燃焼能力の段数を基準に燃焼動作が実施されることを特徴とする請求項２に記載の燃焼装置。 In the slow ignition operation, there is a stable period in which the rotational speed of the blower has shifted to a predetermined rotational speed,
During the transition period, the target heat quantity is changed a plurality of times, and the number of stages of the combustion capacity according to the required heat quantity before entering the transition period coincides with the number of stages of the combustion capacity according to the required heat quantity immediately before the end of the transition period. 3. When performing, the slow ignition operation is terminated without entering the stable period, and the combustion operation is performed based on the number of stages of the combustion capacity corresponding to the required heat quantity before the transition period is entered. The combustion apparatus as described in.
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