JP2002048403A - Combustion control device for hot water feeder - Google Patents
Combustion control device for hot water feederInfo
- Publication number
- JP2002048403A JP2002048403A JP2000235718A JP2000235718A JP2002048403A JP 2002048403 A JP2002048403 A JP 2002048403A JP 2000235718 A JP2000235718 A JP 2000235718A JP 2000235718 A JP2000235718 A JP 2000235718A JP 2002048403 A JP2002048403 A JP 2002048403A
- Authority
- JP
- Japan
- Prior art keywords
- combustion
- combustion control
- amount
- heat quantity
- required heat
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Landscapes
- Instantaneous Water Boilers, Portable Hot-Water Supply Apparatuses, And Control Of Portable Hot-Water Supply Apparatuses (AREA)
- Control Of Combustion (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は給湯機の燃焼制御装
置に関し、特に複数の燃焼制御方式を要求熱量に応じて
切換えるようにした給湯機の燃焼制御装置に関するもの
である。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a combustion control device for a water heater, and more particularly to a combustion control device for a water heater in which a plurality of combustion control systems are switched in accordance with a required amount of heat.
【０００２】[0002]
【従来の技術】従来よりこの種のものに於いては、例え
ば特開平９−１７８１１９号や特開２０００−１８５７
３号のようにバーナ部への送風経路中に設けたダンパを
開状態で比例燃焼制御するＨｉ比例燃焼制御とダンパを
閉状態で比例燃焼制御するＬｏ比例燃焼制御の二つの燃
焼制御方式を有し、Ｈｉ比例燃焼制御で燃焼している際
に、入水温度と流量と給湯設定温度により演算されるフ
ィードフォワード要求熱量（以下、ＦＦ要求熱量）と給
湯設定温度と出湯温度との差に基づくフィードバック要
求熱量（以下、ＦＢ要求熱量）との和である総要求熱量
が予め定められた基準切換熱量以下になったらダンパを
閉じてＬｏ比例燃焼制御に切換えるようにしたものがあ
った。また、例えば特開昭６２−１６２８４７号や特開
平７−１４５９３２号のようにＯＮ／ＯＦＦ燃焼制御と
比例燃焼制御の二つの燃焼制御方式を有し、比例燃焼制
御で燃焼している際に、ＦＦ要求熱量が基準切換熱量以
下になったらＯＮ／ＯＦＦ燃焼制御に切換えるようにし
ているものがあった。2. Description of the Related Art Conventionally, in this kind, for example, JP-A-9-178119 and JP-A-2000-1857.
As described in No. 3, there are two types of combustion control systems: Hi proportional combustion control in which the damper provided in the ventilation path to the burner is opened when the damper is open, and Lo proportional combustion control in which the damper is closed when the damper is closed. Then, during combustion by the Hi proportional combustion control, feedback based on a difference between the feedforward required heat amount (hereinafter, referred to as FF required heat amount) calculated from the incoming water temperature, the flow rate, and the set hot water supply temperature, and the set hot water supply temperature and the outlet water temperature. When the total required heat amount, which is the sum of the required heat amount (hereinafter referred to as FB required heat amount), becomes equal to or less than a predetermined reference switching heat amount, the damper is closed to switch to the Lo proportional combustion control. Also, for example, as disclosed in Japanese Patent Application Laid-Open Nos. 62-162847 and 7-145932, there are two combustion control systems of ON / OFF combustion control and proportional combustion control. In some cases, the control is switched to the ON / OFF combustion control when the FF required heat quantity falls below the reference switching heat quantity.
【０００３】[0003]
【発明が解決しようとする課題】ところが、先の従来の
ものでは流量の急変や給湯設定温度の変更によりＦＢ要
求熱量が過敏に反応し大きく増減して振れてしまうこと
があり、総要求熱量が一時的に基準切換熱量の上下に振
れてしまい、ダンパ開状態の燃焼制御方式に切換わった
途端に元のダンパ閉状態の燃焼制御方式に戻る燃焼制御
方式の切換えのチャタリングが発生してしまい、切換動
作を行うことによる出湯温度のオーバー／アンダーシュ
ートが発生してしまう問題があり、また、後の従来のも
のでは入水温度センサや流量センサのバラツキによって
実際の必要熱量とＦＦ要求熱量の間にズレが生じ、実際
は燃焼制御方式を切換える必要があるのにＦＦ要求熱量
が基準切換熱量に達しないためいつまでも切換わらずに
出湯温度が給湯設定温度からズレた状態を継続してしま
うという問題があった。However, in the prior art described above, the required FB calorific value may react excessively due to a sudden change in the flow rate or a change in the set hot water supply temperature, and may greatly fluctuate. The reference switching calorific value temporarily fluctuates up and down, and as soon as the combustion control method is switched to the damper open state, chattering occurs in the switching of the combustion control method that returns to the original combustion control method with the damper closed. However, there is a problem that over / undershoot of the hot water temperature occurs due to the switching operation, and in the later conventional one, the difference between the actual required heat amount and the FF required heat amount depends on the variation of the incoming water temperature sensor and the flow rate sensor. The FF demand calorie does not reach the reference switching calorie, but the tapping temperature is not changed forever and the hot water supply is set. The state was shifted from the temperature there is a problem that continues.
【０００４】[0004]
【課題を解決するための手段】そこで本発明はこの点に
着目し上記課題を解決するため、請求項１では特にその
構成を、熱交換器と、この熱交換器下流に設けられた出
湯温度センサと、前記熱交換器を加熱するバーナ部とを
備え、フィードフォワード要求熱量とフィードバック要
求熱量とに基づく総要求熱量により燃焼量可変制御を行
うと共に、燃焼量の小さい領域では前記バーナ部を第１
燃焼制御方式で燃焼させ、また燃焼量の大きい領域では
前記バーナ部を前記第１燃焼制御方式とは異なる第２燃
焼制御方式で燃焼させるようにした給湯機の燃焼制御装
置であって、前記第１燃焼制御方式での制御状態におい
て、フィードフォワード要求熱量が第１基準切換熱量以
上になった場合は前記第２燃焼制御方式に切換え、また
フィードフォワード要求熱量が前記第１基準切換熱量以
下で且つ総要求熱量が前記第１基準切換熱量以上になっ
た場合は、燃焼量が前記第１燃焼制御方式の最大燃焼量
になった後に出湯温度から設定温度を引いた差を演算
し、この差が負の所定値以下であると前記第２燃焼制御
方式に切換えるようにした。Therefore, the present invention focuses on this point, and in order to solve the above-mentioned problems, in the present invention, the structure of the present invention is particularly defined by a heat exchanger and a tap water temperature provided downstream of the heat exchanger. A sensor and a burner section for heating the heat exchanger, performing the combustion amount variable control based on the total required heat amount based on the feedforward required heat amount and the feedback required heat amount, and including the burner portion in a region where the combustion amount is small. 1
A combustion control device for a water heater in which combustion is performed by a combustion control method, and in a region where the amount of combustion is large, the burner unit is burned by a second combustion control method different from the first combustion control method. In the control state of the one-combustion control method, when the required feed-forward heat quantity is equal to or more than the first reference switching heat quantity, the mode is switched to the second combustion control method, and the required feed-forward required heat quantity is equal to or less than the first reference switching heat quantity and When the total required heat amount is equal to or greater than the first reference switching heat amount, a difference obtained by subtracting the set temperature from the tapping temperature after the combustion amount reaches the maximum combustion amount of the first combustion control method is calculated. When the value is equal to or less than the negative predetermined value, the mode is switched to the second combustion control method.
【０００５】また、請求項２では特にその構成を、熱交
換器と、この熱交換器下流に設けられた出湯温度センサ
と、前記熱交換器を加熱するバーナ部とを備え、フィー
ドフォワード要求熱量とフィードバック要求熱量とに基
づく総要求熱量により燃焼量可変制御を行うと共に、燃
焼量の小さい領域では前記バーナ部を第１燃焼制御方式
で燃焼させ、また燃焼量の大きい領域では前記バーナ部
を前記第１燃焼制御方式とは異なる第２燃焼制御方式で
燃焼させるようにした給湯機の燃焼制御装置であって、
前記第２燃焼制御方式での制御状態において、フィード
フォワード要求熱量が第２基準切換熱量以下になった場
合は前記第１燃焼制御方式に切換え、またフィードフォ
ワード要求熱量が前記第２基準切換熱量以上で且つ総要
求熱量が前記第２基準切換熱量以下になった場合は、燃
焼量が前記第２燃焼制御方式の最小燃焼量になった後に
出湯温度から設定温度を引いた差を演算し、この差が正
の所定値以上であると前記第１燃焼制御方式に切換える
ようにした。According to a second aspect of the present invention, there is provided a heat exchanger comprising a heat exchanger, a tapping temperature sensor provided downstream of the heat exchanger, and a burner for heating the heat exchanger. While performing the combustion amount variable control based on the total required heat amount based on the feedback required heat amount and the feedback required heat amount, the burner portion is burned by the first combustion control method in a region where the combustion amount is small, and the burner portion is burned in the region where the combustion amount is large. A combustion control device for a water heater configured to burn in a second combustion control method different from the first combustion control method,
In the control state of the second combustion control method, when the feed forward required heat amount becomes equal to or less than the second reference switching heat amount, the mode is switched to the first combustion control method, and the feed forward required heat amount is equal to or more than the second reference switching heat amount. When the total required heat amount is equal to or less than the second reference switching heat amount, the difference is calculated by subtracting the set temperature from the tapping temperature after the combustion amount has reached the minimum combustion amount of the second combustion control method. If the difference is equal to or more than a positive predetermined value, the system is switched to the first combustion control system.
【０００６】[0006]
【発明の実施の形態】請求項１に係る発明によると、熱
交換器１と、この熱交換器１下流に設けられた出湯温度
センサ４と、前記熱交換器１を加熱するバーナ部１２と
を備え、入水温度と流量と給湯設定温度により演算され
るＦＦ要求熱量と給湯設定温度と出湯温度との差に基づ
くＦＢ要求熱量とに基づく総要求熱量により燃焼量可変
制御を行うと共に、燃焼量の小さい領域では前記バーナ
部１２を第１燃焼制御方式で燃焼させ、また燃焼量の大
きい領域では前記バーナ部１２を前記第１燃焼制御方式
とは異なる第２燃焼制御方式で燃焼させるようにした給
湯機の燃焼制御装置２９であって、前記第１燃焼制御方
式での制御状態において、ＦＦ要求熱量が第１基準切換
熱量以上になった場合は前記第２燃焼制御方式に切換
え、またＦＦ要求熱量が前記第１基準切換熱量以下で且
つ総要求熱量が前記第１基準切換熱量以上になった場合
は、燃焼量が前記第１燃焼制御方式の最大燃焼量になっ
た後に出湯温度から設定温度を引いた差を演算し、この
差が負の所定値以下であると前記第２燃焼制御方式に切
換えるようにしたので、ＦＢ要求熱量が急激に増減して
振れることによる燃焼制御方式の切換えのチャタリング
現象を防止することができると共に、電磁ポンプ１４の
送油量や入水温度センサ４と流量センサ５の検出値のバ
ラツキによって実際の必要熱量とＦＦ要求熱量または実
際の燃焼量がズレていた場合にも燃焼制御方式を切換え
ることができて出湯温度が給湯設定温度からズレた状態
が長時間継続することを防止でき、出湯温度の変動の少
ない安定した出湯を行うことができる。DESCRIPTION OF THE PREFERRED EMBODIMENTS According to the first aspect of the present invention, a heat exchanger 1, a tapping temperature sensor 4 provided downstream of the heat exchanger 1, and a burner section 12 for heating the heat exchanger 1 are provided. And performs variable combustion amount control based on the total required heat amount based on the FF required heat amount calculated based on the inlet water temperature, the flow rate, and the hot water supply set temperature, and the FB required heat amount based on the difference between the hot water supply set temperature and the outlet water temperature. The burner section 12 is burned by the first combustion control method in a region where the combustion amount is small, and the burner portion 12 is burned by a second combustion control method different from the first combustion control method in a region where the combustion amount is large. The combustion control device 29 of the water heater, wherein, in the control state of the first combustion control method, when the FF required heat quantity is equal to or more than the first reference switching heat quantity, the combustion control apparatus is switched to the second combustion control method. heat Is less than or equal to the first reference switching calorie and the total required calorie is greater than or equal to the first reference switching calorie, after the combustion amount reaches the maximum combustion amount of the first combustion control method, the set temperature is changed from the tapping temperature. The subtracted difference is calculated, and if the difference is equal to or smaller than a negative predetermined value, the control is switched to the second combustion control method. Therefore, the chattering for switching the combustion control method due to a sudden increase or decrease in the FB required heat quantity and fluctuation. In addition to preventing the phenomenon, the actual required heat amount and the FF required heat amount or the actual combustion amount may be deviated due to variations in the oil supply amount of the electromagnetic pump 14 and the detection values of the input water temperature sensor 4 and the flow rate sensor 5. It is also possible to switch the combustion control method, to prevent a state where the tapping temperature deviates from the hot water supply set temperature for a long time, and to perform a stable tapping with little variation in tapping temperature.
【０００７】請求項２に係る発明によると、熱交換器１
と、この熱交換器１下流に設けられた出湯温度センサ４
と、前記熱交換器１を加熱するバーナ部１２とを備え、
入水温度と流量と給湯設定温度により演算されるＦＦ要
求熱量と給湯設定温度と出湯温度との差に基づくＦＢ要
求熱量とに基づく総要求熱量により燃焼量可変制御を行
うと共に、燃焼量の小さい領域では前記バーナ部１２を
第１燃焼制御方式で燃焼させ、また燃焼量の大きい領域
では前記バーナ部１２を前記第１燃焼制御方式とは異な
る第２燃焼制御方式で燃焼させるようにした給湯機の燃
焼制御装置２９であって、前記第２燃焼制御方式での制
御状態において、ＦＦ要求熱量が第２基準切換熱量以下
になった場合は前記第１燃焼制御方式に切換え、またＦ
Ｆ要求熱量が前記第２基準切換熱量以上で且つ総要求熱
量が前記第１基準切換熱量以下になった場合は、燃焼量
が前記第２燃焼制御方式の最小燃焼量になった後に出湯
温度から設定温度を引いた差を演算し、この差が正の所
定値以上であると前記第１燃焼制御方式に切換えるよう
にしたので、ＦＢ要求熱量が急激に増減して振れること
による燃焼制御方式の切換えのチャタリング現象を防止
することができると共に、電磁ポンプ１４の送油量や入
水温度センサ４と流量センサ５の検出値のバラツキによ
って実際の必要熱量とＦＦ要求熱量または実際の燃焼量
がズレていた場合にも燃焼制御方式を切換えることがで
きて出湯温度が給湯設定温度からズレた状態が長時間継
続することを防止でき、出湯温度の変動の少ない安定し
た出湯を行うことができる。According to the invention of claim 2, the heat exchanger 1
And a tapping temperature sensor 4 provided downstream of the heat exchanger 1.
And a burner section 12 for heating the heat exchanger 1.
The combustion amount variable control is performed based on the total required heat amount based on the FF required heat amount calculated based on the inlet water temperature, the flow rate, and the hot water supply set temperature, and the FB required heat amount based on the difference between the hot water supply set temperature and the outlet water temperature, and a region where the combustion amount is small. In the water heater, the burner unit 12 is burned by a first combustion control system, and the burner unit 12 is burned by a second combustion control system different from the first combustion control system in a region where the amount of combustion is large. In the combustion control device 29, in the control state of the second combustion control method, when the FF required heat quantity becomes equal to or less than the second reference switching heat quantity, the combustion control apparatus 29 switches to the first combustion control method,
When the required heat quantity is equal to or more than the second reference switching heat quantity and the total required heat quantity is equal to or less than the first reference switching heat quantity, after the combustion quantity reaches the minimum combustion quantity of the second combustion control method, the temperature is calculated from the tapping temperature. A difference obtained by subtracting the set temperature is calculated, and if the difference is equal to or more than a positive predetermined value, the first combustion control method is switched to the first combustion control method. The switching chattering phenomenon can be prevented, and the actual required heat amount and the FF required heat amount or the actual combustion amount are shifted due to variations in the oil supply amount of the electromagnetic pump 14 and the detection values of the input water temperature sensor 4 and the flow rate sensor 5. In this case, the combustion control method can be switched even in the event that the tapping temperature deviates from the hot water supply set temperature for a long time, and stable tapping with little fluctuation in tapping temperature can be performed. It can be.
【０００８】ここで、第１燃焼制御方式と第２燃焼制御
方式は、例えば送風経路２２に設けたダンパ２４の閉状
態でのＬｏ比例燃焼制御を第１燃焼制御方式とし、ダン
パ２４の開状態でのＨｉ比例燃焼制御を第２燃焼制御方
式とすることができ、また例えばＯＮ／ＯＦＦ燃焼制御
を第１燃焼制御方式とし、比例燃焼制御を第２燃焼制御
方式とすることができ、さらにまた、第１バーナ３１の
みの燃焼制御を第１燃焼制御方式とし、第１バーナ３１
と第２バーナ３２の同時使用での燃焼制御を第２燃焼制
御方式とすることができるもので、第１燃焼制御方式は
燃焼量の小さい領域に対応し、第２燃焼制御方式は燃焼
量の大きい領域に対応すると共に、第１燃焼制御方式と
第２燃焼制御方式とは燃焼制御の仕方が異なればよいも
のである。Here, the first combustion control method and the second combustion control method are, for example, Lo proportional combustion control in a closed state of a damper 24 provided in an air passage 22 as a first combustion control method, and an open state of the damper 24. Can be a second combustion control system, for example, ON / OFF combustion control can be a first combustion control system, and proportional combustion control can be a second combustion control system. The combustion control of only the first burner 31 is defined as a first combustion control method, and the first burner 31
And the second burner 32 can be used as the second combustion control system. The first combustion control system corresponds to a region where the amount of combustion is small, and the second combustion control system corresponds to the region where the combustion amount is small. It is sufficient that the first combustion control method and the second combustion control method have different combustion control methods while corresponding to a large area.
【０００９】尚、第１切換熱量と第２切換熱量の大小関
係は、第１切換熱量が第２切換熱量より大きいことが望
ましいが、同一の熱量になることを妨げるものではな
い。Note that the magnitude relation between the first switching heat quantity and the second switching heat quantity is desirably that the first switching heat quantity is larger than the second switching heat quantity, but does not prevent the same heat quantity.
【００１０】[0010]
【実施例】次に本発明を図１〜図７に示した一実施例に
基づいて説明する。１はフィンチューブ式の熱交換器
で、入水管２及び出湯管３が接続されている。４は市水
道等から入水管２に流入する水の温度を検出する入水温
度センサで、５は熱交換器１に流れる水の温度を検出す
る流量センサである。６は熱交換器１の途中を流れる水
の温度を検出する熱交温度センサで、７は熱交換器１か
らの湯が異常高温になるとこの給湯機を異常停止させる
ための異常停止サーモである。８は流量センサ５の上流
側で入水管２から分岐して熱交換器１をバイパスし水を
出湯管３に合流させるバイパス管で、ステッピングモー
タよりなるミキシングモータ９で駆動されるミキシング
弁１０を介して出湯管３に接続されている。１１はミキ
シング弁１０下流側の出湯管３に設けられ、熱交換器１
で加熱された湯とバイパス管８からの水とが混合された
湯の温度を検出する出湯温度センサである。DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, the present invention will be described based on one embodiment shown in FIGS. Reference numeral 1 denotes a fin tube type heat exchanger to which an inlet pipe 2 and a tapping pipe 3 are connected. Reference numeral 4 denotes an incoming water temperature sensor for detecting the temperature of water flowing into the inlet pipe 2 from city water supply or the like, and reference numeral 5 denotes a flow rate sensor for detecting the temperature of water flowing to the heat exchanger 1. Reference numeral 6 denotes a heat exchange temperature sensor for detecting the temperature of water flowing in the middle of the heat exchanger 1. Reference numeral 7 denotes an abnormal stop thermometer for abnormally stopping the water heater when the temperature of the hot water from the heat exchanger 1 becomes abnormally high. . Reference numeral 8 denotes a bypass pipe which branches from the water inlet pipe 2 on the upstream side of the flow rate sensor 5 and bypasses the heat exchanger 1 and joins the water to the tapping pipe 3. The bypass pipe 8 is driven by a mixing motor 9 composed of a stepping motor. It is connected to the tapping pipe 3 via the same. 11 is provided on the tapping pipe 3 downstream of the mixing valve 10,
Is a hot water temperature sensor for detecting the temperature of hot water in which the hot water heated by the heater and the water from the bypass pipe 8 are mixed.
【００１１】１２は熱交換器１を加熱するバーナ部で、
その構造を説明すると、１３は電磁ポンプ１４から圧送
される液体燃料を気化ヒータ１５で加熱される気化器１
６へ向けて噴射する噴射ノズルで、１７は気化器１６の
下方に連通し気化器１６で気化した気化ガスと燃焼用送
風機１８からの燃焼用一次空気を混合する混合室で、１
９は混合室１７の下流側上面で且つ気化器１６の背面側
に設けられたバーナヘッドで、２０は気化器１６背面に
一体に形成され燃焼熱を吸収して気化器１６の加熱を行
う吸熱フィンであり、これら気化器１６、混合室１７は
箱状の二次空気室２１内に設けられている。Reference numeral 12 denotes a burner for heating the heat exchanger 1.
Explaining the structure, reference numeral 13 denotes a vaporizer 1 in which liquid fuel pumped from an electromagnetic pump 14 is heated by a vaporization heater 15.
Reference numeral 17 denotes an injection nozzle which communicates below the vaporizer 16 and a mixing chamber 17 for mixing the vaporized gas vaporized by the vaporizer 16 with the primary air for combustion from the combustion blower 18.
9 is a burner head provided on the downstream upper surface of the mixing chamber 17 and on the back side of the vaporizer 16, and 20 is an endotherm integrally formed on the rear surface of the vaporizer 16 to absorb combustion heat and heat the vaporizer 16. These are fins, and the vaporizer 16 and the mixing chamber 17 are provided in a box-shaped secondary air chamber 21.
【００１２】２２は燃焼用送風機１８と気化器１６及び
二次空気室２１を連通する送風経路で、この送風経路２
２途中にはステッピングモータよりなるダンパモータ２
３で開閉され弱送風時に閉して送風圧を確保するダンパ
２４が設けられている。２５は送風経路２２に連通し気
化器１６内に噴射ノズル１３から噴射された液体燃料と
燃焼用送風機１８からの燃焼用一次空気を取り込む一次
空気口で、この一次空気口２５の周囲には二次空気室２
１に連通して燃焼用二次空気を取り込む二次空気口２６
が設けられている。２７はバーナヘッド１９から噴出さ
れる混合ガスに点火する点火器で、２８はバーナヘッド
１９の炎の状態を検出するフレームロッドである。Reference numeral 22 denotes a ventilation path which communicates the combustion blower 18, the carburetor 16 and the secondary air chamber 21 with each other.
2 A damper motor 2 consisting of a stepping motor
A damper 24 is provided which is opened and closed by 3 and closed when weak air is blown to secure the air blowing pressure. Reference numeral 25 denotes a primary air port which communicates with the blowing path 22 and takes in the liquid fuel injected from the injection nozzle 13 into the carburetor 16 and the primary air for combustion from the combustion blower 18. Next air chamber 2
Secondary air port 26 which communicates with 1 and takes in secondary air for combustion
Is provided. Reference numeral 27 denotes an igniter for igniting the mixed gas ejected from the burner head 19, and reference numeral 28 denotes a frame rod for detecting the state of the flame of the burner head 19.
【００１３】燃焼が開始されると、噴射ノズル１３から
噴射された液体燃料は高温の気化器１６に衝突して気化
し、一次空気口２５から流入する燃焼用一次空気と混合
しながら混合室１７を通過してバーナヘッド１９へ供給
され、点火器２７により点火されて燃焼する。ここで、
一次空気口２５の周囲の二次空気口２６から二次空気室
２１に流入した燃焼用二次空気は混合室１７の脇からバ
ーナヘッド１９の側面に供給されバーナヘッド１９の火
炎が完全燃焼するものである。When the combustion is started, the liquid fuel injected from the injection nozzle 13 collides with the high-temperature carburetor 16 and is vaporized. The liquid fuel is mixed with the primary air for combustion flowing from the primary air port 25 while mixing in the mixing chamber 17. Is supplied to the burner head 19 and ignited by the igniter 27 to burn. here,
The secondary air for combustion that has flowed into the secondary air chamber 21 from the secondary air port 26 around the primary air port 25 is supplied to the side of the burner head 19 from the side of the mixing chamber 17 and the flame of the burner head 19 is completely burned. Things.
【００１４】２９はこの給湯機の制御を行う燃焼制御装
置で、給湯栓（図示せず）が開かれ流量センサ５の検出
する流量が最低作動流量（ここでは２Ｌ／ｈ）以上にな
ると燃焼用送風機１８、電磁ポンプ１４、点火器２７を
駆動して燃焼を開始し、リモコン（図示せず）等で設定
された給湯設定温度の湯を出すように、給湯設定温度
と、入水温度センサ４で検出する入水温度と、流量セン
サ５で検出する熱交流量とミキシング弁１０の開度より
演算される総流量とによるフィードフォワード要求熱量
（以下、ＦＦ要求熱量）と、給湯設定温度と出湯温度セ
ンサ１１で検出する出湯温度との差をＰＩＤ演算したフ
ィードバック要求熱量（以下、ＦＢ要求熱量）との和で
ある総要求熱量により燃焼量を可変制御する。Reference numeral 29 denotes a combustion control device for controlling the hot water supply unit. When a hot water tap (not shown) is opened and the flow rate detected by the flow rate sensor 5 exceeds a minimum operating flow rate (here, 2 L / h), a combustion control unit 29 is provided. The blower 18, the electromagnetic pump 14, and the igniter 27 are driven to start combustion, and the hot water set temperature and the incoming water temperature sensor 4 are used to output hot water at the hot water set temperature set by a remote controller (not shown) or the like. Feedforward required heat amount (hereinafter referred to as FF required heat amount) based on the detected incoming water temperature, the heat exchange amount detected by the flow rate sensor 5 and the total flow rate calculated from the opening of the mixing valve 10, a hot water supply set temperature, and a hot water temperature sensor The combustion amount is variably controlled by the total required heat amount which is the sum of the difference from the hot water temperature detected at 11 and the feedback required heat amount (hereinafter, referred to as FB required heat amount) obtained by PID calculation.
【００１５】ここで、この給湯機の燃焼制御装置２９は
総要求熱量に応じて三つの燃焼制御方式うちの一つの燃
焼制御方式で燃焼を行うと共に、この燃焼制御方式の切
換えはＦＦ要求熱量と基準切換熱量とを比較して行うよ
うにしており、図３に示すように燃焼制御方式の一つ目
は総要求熱量（燃焼量）が大きい熱量Ａ〜基準切換熱量
Ｃの領域ではダンパ２４を開状態にして総要求熱量に応
じて電磁ポンプ１４及び燃焼用送風機１８を駆動制御し
て燃焼量を可変制御するＨｉ比例燃焼制御領域で、燃焼
制御方式の二つ目は総要求熱量（燃焼量）がＨｉ比例燃
焼領域よりも小さい基準切換熱量Ｂ〜基準切換熱量Ｅの
領域ではダンパ２４を閉状態にして総要求熱量に応じて
電磁ポンプ１４及び燃焼用送風機１８を駆動制御して燃
焼量を可変制御するＬｏ比例燃焼制御領域で、燃焼制御
方式の三つ目はＬｏ比例燃焼制御領域よりも小さい基準
切換熱量Ｄ〜熱量Ｆの領域ではバーナ部１２の燃焼のＯ
ＮとＯＦＦのサイクルを繰り返してバーナ部１２を最低
燃焼量で連続燃焼したときよりも小さい要求熱量に対応
するようにＯＮ時間とＯＦＦ時間の比を可変制御するＯ
Ｎ／ＯＦＦ燃焼制御領域である。尚、各燃焼制御方式の
領域が重複した領域を設けて燃焼制御方式の切換えのチ
ャタリングを防止している。Here, the combustion control device 29 of the water heater performs combustion in one of the three combustion control systems in accordance with the total required heat amount, and the switching of the combustion control system depends on the FF required heat amount. As shown in FIG. 3, the first method of the combustion control method is to use the damper 24 in the range of the heat amount A where the total required heat amount (burning amount) is large to the reference switching heat amount C as shown in FIG. The Hi proportional combustion control region in which the electromagnetic pump 14 and the combustion blower 18 are driven and controlled in accordance with the total required heat amount in the open state to variably control the combustion amount. The second of the combustion control methods is the total required heat amount (combustion amount). ) Is smaller than the Hi proportional combustion region, the damper 24 is closed and the electromagnetic pump 14 and the combustion blower 18 are driven and controlled in accordance with the total required heat amount to reduce the combustion amount. Variable control In Lo proportional combustion control region, third is O combustion of the burner unit 12 in the region of small reference switching 換熱 amount D~ heat F than Lo proportional combustion control region of the combustion control method
The cycle of N and OFF is repeated to variably control the ratio of the ON time to the OFF time so as to correspond to the required heat quantity smaller than when the burner section 12 is continuously burned at the minimum combustion quantity.
This is an N / OFF combustion control area. It should be noted that chattering of switching of the combustion control method is prevented by providing an area where the areas of the respective combustion control methods overlap.
【００１６】今、Ｈｉ比例燃焼制御を行っている際に総
要求熱量が減少してＬｏ比例燃焼制御に切換える場合に
ついて図４のフローチャートに基づいて説明すると、Ｆ
Ｆ要求熱量が基準切換熱量Ｃ以下になった場合（ステッ
プ１、以下Ｓ１）は、ダンパモータ２３を駆動してダン
パ２４を全閉状態にして基準切換熱量Ｂ〜基準切換熱量
Ｅの領域内で燃焼量を可変制御するＬｏ比例燃焼制御に
燃焼制御方式を切換える（Ｓ２）。Now, the case where the total required heat quantity is reduced during Hi-proportional combustion control to switch to Lo-proportional combustion control will be described with reference to the flowchart of FIG.
When the required heat amount F becomes equal to or less than the reference switching heat amount C (step 1, hereinafter S1), the damper motor 23 is driven to fully close the damper 24, and combustion is performed in the range from the reference switching heat amount B to the reference switching heat amount E. The combustion control method is switched to Lo proportional combustion control in which the amount is variably controlled (S2).
【００１７】また、ＦＦ要求熱量が基準切換熱量Ｃ以上
であるがＦＢ要求熱量を加えた総要求熱量が基準切換熱
量Ｃ以下になった場合（Ｓ３）は、この総要求熱量に応
じて燃焼量がＨｉ比例燃焼制御領域の最小燃焼量になる
のを待ち（Ｓ４）、燃焼量がＨｉ比例燃焼制御領域の最
小燃焼量になると、流量センサ５により流量をカウント
し始めて（Ｓ５）熱交換器１への積算流量が熱交換器１
の容量以上（ここでは１Ｌ）になると（Ｓ６）、出湯温
度センサ１１で検出する出湯温度からリモコン等で設定
した給湯設定温度を引いた差を演算し、この差が正の所
定値（ここでは２（℃））以上であると（Ｓ７）、ダン
パモータ２３を駆動してダンパ２４を全閉状態にして基
準切換熱量Ｂ〜基準切換熱量Ｅの領域内で燃焼量を可変
制御するＬｏ比例燃焼制御に燃焼制御方式を切換える
（Ｓ２）。When the required heat quantity of the FF is equal to or more than the reference switching heat quantity C but the total required heat quantity including the FB required heat quantity is equal to or less than the reference switching heat quantity C (S3), the combustion amount is determined according to the total required heat quantity. Waits for the minimum combustion amount in the Hi proportional combustion control region (S4). When the combustion amount reaches the minimum combustion amount in the Hi proportional combustion control region, the flow sensor 5 starts counting the flow (S5). Heat exchanger 1
(Here, 1L) or more (here, 1L), a difference is calculated by subtracting the hot water supply set temperature set by the remote controller or the like from the hot water temperature detected by the hot water temperature sensor 11, and the difference is calculated as a positive predetermined value (here, 2 (° C.)) or more (S7), Lo proportional combustion control in which the damper motor 23 is driven to fully close the damper 24 and the combustion amount is variably controlled within the range of the reference switching heat amount B to the reference switching heat amount E. The combustion control method is switched to (S2).
【００１８】このようにＦＦ要求熱量のみに基づいた燃
焼制御方式の切換えのみならず、ＦＦ要求熱量にＦＢ要
求熱量を加えた総要求熱量が基準切換熱量Ｃを下回った
ときに、Ｈｉ比例燃焼制御領域の最小燃焼量に達するの
を待って最小燃焼量での熱交換が出湯温度に反映される
のを待ち、そして出湯温度が給湯設定温度より所定値以
上高くなっている場合にＬｏ比例燃焼制御に燃焼制御方
式を切換えるようにしたため、ＦＢ要求熱量が急激に増
減して振れることによる燃焼制御方式の切換えのチャタ
リング現象を防止することができると共に、電磁ポンプ
１４の送油量や入水温度センサ４と流量センサ５の検出
値のバラツキによって実際の必要熱量とＦＦ要求熱量ま
たは実際の燃焼量がズレていた場合にも燃焼制御方式を
切換えることができて出湯温度が給湯設定温度からズレ
た状態が長時間継続することを防止でき、出湯温度の変
動のない安定した出湯を行うことができる。As described above, in addition to switching the combustion control method based only on the FF required heat amount, when the total required heat amount obtained by adding the FB required heat amount to the FF required heat amount falls below the reference switching heat amount C, the Hi proportional combustion control is performed. Wait until the minimum combustion amount in the region reaches the minimum combustion amount, wait for the heat exchange at the minimum combustion amount to be reflected in the tapping temperature, and if the tapping temperature is higher than the set hot water supply temperature by a predetermined value, Lo proportional combustion control Since the combustion control method is switched to the other, it is possible to prevent a chattering phenomenon of switching the combustion control method due to a sudden increase and decrease of the FB required heat amount, and to prevent the oil supply amount of the electromagnetic pump 14 and the water input temperature sensor 4 from changing. The combustion control method can be switched even when the actual required heat quantity and the FF required heat quantity or the actual combustion quantity are different due to the variation of the detection value of the flow rate sensor 5 and the flow rate. Hot water temperature Te can be prevented that the state was shifted from the hot water set temperature continues for a long time, it is possible to perform stable tapped without variation of tapping temperature.
【００１９】次に、Ｌｏ比例燃焼制御を行っている際に
総要求熱量が増加してＨｉ比例燃焼制御に切換える場合
について図５のフローチャートに基づいて説明すると、
ＦＦ要求熱量が基準切換熱量Ｂ以上になった場合（Ｓ
８）は、ダンパモータ２３を駆動してダンパ２４を全開
状態にして基準切換熱量Ａ〜基準切換熱量Ｃの領域内で
燃焼量を可変制御するＨｉ比例燃焼制御に燃焼制御方式
を切換える（Ｓ９）。Next, the case where the total required heat amount increases during the Lo proportional combustion control to switch to the Hi proportional combustion control will be described with reference to the flowchart of FIG.
When the FF required heat quantity becomes equal to or more than the reference switching heat quantity B (S
8) The damper motor 23 is driven to fully open the damper 24, and the combustion control method is switched to Hi proportional combustion control in which the combustion amount is variably controlled within the range of the reference switching heat amount A to the reference switching heat amount C (S9).
【００２０】また、ＦＦ要求熱量が基準切換熱量Ｂ以下
であるがＦＢ要求熱量を加えた総要求熱量が基準切換熱
量Ｂ以上になった場合（Ｓ１０）は、この総要求熱量に
応じて燃焼量がＬｏ比例燃焼制御領域の最大燃焼量にな
るのを待ち（Ｓ１１）、燃焼量がＬｏ比例燃焼制御領域
の最大燃焼量になると、流量センサ５により流量をカウ
ントし始めて（Ｓ１２）熱交換器１への積算流量が熱交
換器１の容量以上（ここでは１Ｌ）になると（Ｓ１
３）、出湯温度センサ１１で検出する出湯温度からリモ
コン等で設定した給湯設定温度を引いた差を演算し、こ
の差が負の所定値（ここでは−２（℃））以下であると
（Ｓ１４）、ダンパモータ２３を駆動してダンパ２４を
全開状態にして基準切換熱量Ａ〜基準切換熱量Ｃの領域
内で燃焼量を可変制御するＨｉ比例燃焼制御に燃焼制御
方式を切換える（Ｓ９）。If the required heat quantity of the FF is equal to or less than the reference switching heat quantity B, but the total required heat quantity including the FB required heat quantity is equal to or greater than the reference switching heat quantity B (S10), the combustion amount is determined according to the total required heat quantity. Waits for the maximum amount of combustion in the Lo proportional combustion control region (S11), and when the amount of combustion reaches the maximum amount of combustion in the Lo proportional combustion control region, the flow sensor 5 starts counting the flow rate (S12). When the integrated flow rate to the heat exchanger 1 becomes equal to or larger than the capacity of the heat exchanger 1 (here, 1 L) (S1).
3) A difference obtained by subtracting the hot water supply set temperature set by a remote controller or the like from the hot water temperature detected by the hot water temperature sensor 11 is calculated, and if this difference is equal to or less than a negative predetermined value (here, -2 (° C.)) ( S14) The damper motor 23 is driven to fully open the damper 24, and the combustion control method is switched to Hi proportional combustion control in which the combustion amount is variably controlled within the range of the reference switching heat amount A to the reference switching heat amount C (S9).
【００２１】このようにＦＦ要求熱量のみに基づいた燃
焼制御方式の切換えのみならず、ＦＦ要求熱量にＦＢ要
求熱量を加えた総要求熱量が基準切換熱量Ｂを上回った
ときに、Ｌｏ比例燃焼制御領域の最大燃焼量に達するの
を待って最大燃焼量での熱交換が出湯温度に反映される
のを待ち、そして出湯温度が給湯設定温度より所定値以
上低くなっている場合にＨｉ比例燃焼制御に燃焼制御方
式を切換えるようにしたため、ＦＢ要求熱量が急激に増
減して振れることによる燃焼制御方式の切換えのチャタ
リング現象を防止することができると共に、電磁ポンプ
１４の送油量や入水温度センサ４と流量センサ５の検出
値のバラツキによって実際の必要熱量とＦＦ要求熱量ま
たは実際の燃焼量がズレていた場合にも燃焼制御方式を
切換えることができて出湯温度が給湯設定温度からズレ
た状態が長時間継続することを防止でき、出湯温度の変
動の少ない安定した出湯を行うことができる。As described above, not only the switching of the combustion control method based on only the FF required heat amount but also the Lo proportional combustion control when the total required heat amount obtained by adding the FB required heat amount to the FF required heat amount exceeds the reference switching heat amount B. Wait until the maximum combustion amount in the region is reached, wait for heat exchange at the maximum combustion amount to be reflected in the tapping temperature, and if the tapping temperature is lower than the hot water supply set temperature by a predetermined value or more, Hi proportional combustion control Since the combustion control method is switched to the other, it is possible to prevent a chattering phenomenon of switching the combustion control method due to a sudden increase and decrease of the FB required heat amount, and to prevent the oil supply amount of the electromagnetic pump 14 and the water input temperature sensor 4 from changing. The combustion control method can be switched even when the actual required heat quantity and the FF required heat quantity or the actual combustion quantity are different due to the variation of the detection value of the flow rate sensor 5 and the flow rate. Hot water temperature Te can be prevented that the state was shifted from the hot water set temperature continues for a long time, it can be performed less stable pouring fluctuation of tapping temperature.
【００２２】また、Ｌｏ比例燃焼制御からＯＮ／ＯＦＦ
燃焼制御への切換えは図６のフローチャートに示すよう
に行われ、ＯＮ／ＯＦＦ燃焼制御からＬｏ比例燃焼制御
への切換えは図７のフローチャートに示すように行わ
れ、その説明はＨｉ比例燃焼制御とＬｏ比例燃焼制御の
切換えとほとんど変わりがないため省略する。Also, the ON / OFF switching from the Lo proportional combustion control is performed.
The switching to the combustion control is performed as shown in the flowchart of FIG. 6, and the switching from ON / OFF combustion control to the Lo proportional combustion control is performed as shown in the flowchart of FIG. The description is omitted because there is almost no difference from the switching of the Lo proportional combustion control.
【００２３】次に、図８に示した本発明の他の一実施例
を先の一実施例と同じ部分の説明を省略し異なる部分の
みを説明する。この他の一実施例は、先の一実施例のバ
ーナ部１２をガスバーナ３０に置き換えたものである。
ここで、このガスバーナ３０は比例制御可能な第１バー
ナ３１と燃焼量固定の第２バーナ３２とで構成され、燃
焼制御装置２９で演算される総要求熱量に応じて複数の
燃焼制御方式のうちの一つの燃焼制御方式で燃焼するも
のである。ここで、複数の燃焼制御方式として、例えば
中燃焼量領域での第１バーナ３１のみによる比例燃焼制
御と、大燃焼量領域での第１バーナ３１と第２バーナ３
２の同時使用による比例燃焼制御と、小燃焼量領域での
第２バーナ３２のＯＮ／ＯＦＦ燃焼制御の三つの燃焼制
御方式が考えられ、それぞれの燃焼制御方式を先の一実
施例と同様にＦＦ要求熱量により切換えると共に、ＦＦ
要求熱量が基準切換熱量を超えずに総要求熱量が基準切
換熱量を超えている場合には、出湯温度と給湯設定温度
との差が一定値を超えている場合に燃焼制御方式を切換
えるようにしたものである。Next, in the other embodiment of the present invention shown in FIG. 8, the description of the same parts as those of the previous embodiment will be omitted, and only different parts will be described. In another embodiment, the burner section 12 of the previous embodiment is replaced with a gas burner 30.
Here, the gas burner 30 is composed of a first burner 31 capable of proportional control and a second burner 32 having a fixed combustion amount, and among a plurality of combustion control methods according to the total required heat amount calculated by the combustion control device 29. It burns by one of the combustion control methods. Here, as a plurality of combustion control methods, for example, proportional combustion control using only the first burner 31 in the medium combustion amount region, and the first burner 31 and the second burner 3 in the large combustion amount region are used.
There are three combustion control methods, that is, proportional combustion control by simultaneous use of the two fuel cells and ON / OFF combustion control of the second burner 32 in the small combustion amount region. Each of the combustion control methods is the same as in the first embodiment. Switching according to the required FF calorific value,
If the required heat quantity does not exceed the reference switching heat quantity and the total required heat quantity exceeds the reference switching heat quantity, the combustion control method is switched when the difference between the tapping temperature and the hot water supply setting temperature exceeds a certain value. It was done.
【００２４】[0024]
【発明の効果】以上のように本発明の請求項１によれ
ば、ＦＦ要求熱量のみに基づいた燃焼制御方式の切換え
のみならず、ＦＦ要求熱量とＦＢ要求熱量とに基づいた
総要求熱量が基準切換熱量を上回ったときに、第１燃焼
制御方式の最大燃焼量に達するのを待ち、そして出湯温
度が給湯設定温度より所定値以上低くなっている場合に
第２燃焼制御方式に切換えるようにしたため、ＦＢ要求
熱量が急激に増減して振れることによる燃焼制御方式の
切換えのチャタリング現象を防止することができると共
に、入水温度と流量の検出値のバラツキによって実際の
必要熱量とＦＦ要求熱量がズレていた場合にも燃焼制御
方式を切換えることができて出湯温度が給湯設定温度か
らズレた状態が長時間継続することを防止でき、出湯温
度の変動のない安定した出湯を行うことができる。As described above, according to the first aspect of the present invention, not only the switching of the combustion control method based on only the FF required heat amount, but also the total required heat amount based on the FF required heat amount and the FB required heat amount. When the heat amount exceeds the reference switching heat amount, the system waits for the maximum combustion amount of the first combustion control method to be reached, and switches to the second combustion control method when the tapping temperature is lower than the hot water supply set temperature by a predetermined value or more. As a result, it is possible to prevent a chattering phenomenon of switching the combustion control system due to a sudden increase / decrease of the FB required heat amount, and a deviation between the actual required heat amount and the FF required heat amount due to a variation in the detected values of the incoming water temperature and the flow rate. In this case, the combustion control method can be switched even when the hot water supply temperature has changed, preventing the state in which the hot water temperature deviates from the hot water supply set temperature for a long time, and keeping the hot water temperature stable. Hot water can be carried out was.
【００２５】また、本発明の請求項２によれば、ＦＦ要
求熱量のみに基づいた燃焼制御方式の切換えのみなら
ず、ＦＦ要求熱量とＦＢ要求熱量とに基づいた総要求熱
量が基準切換熱量を下回ったときに、第２燃焼制御方式
の最小燃焼量に達するのを待ち、そして出湯温度が給湯
設定温度より所定値以上高くなっている場合に第１燃焼
制御方式に切換えるようにしたため、ＦＢ要求熱量が急
激に増減して振れることによる燃焼制御方式の切換えの
チャタリング現象を防止することができると共に、入水
温度と流量の検出値のバラツキによって実際の必要熱量
とＦＦ要求熱量がズレていた場合にも燃焼制御方式を切
換えることができて出湯温度が給湯設定温度からズレた
状態が長時間継続することを防止でき、出湯温度の変動
のない安定した出湯を行うことができる。According to the second aspect of the present invention, not only the switching of the combustion control method based on only the FF required heat amount, but also the total required heat amount based on the FF required heat amount and the FB required heat amount determines the reference switching heat amount. When the temperature falls below the minimum combustion amount of the second combustion control system, the system is switched to the first combustion control system when the tapping temperature is higher than the hot water supply set temperature by a predetermined value or more. In addition to preventing the chattering phenomenon of switching the combustion control system due to the sudden increase and decrease of the heat amount, the actual required heat amount and the FF required heat amount are shifted due to the variation of the input water temperature and the detection value of the flow rate. The combustion control method can also be switched, and the state where the tapping temperature deviates from the hot water supply set temperature can be prevented from continuing for a long time, and stable tapping without fluctuation of tapping temperature It can be carried out.
【図１】本発明の一実施例の構成図。FIG. 1 is a configuration diagram of an embodiment of the present invention.
【図２】同一実施例の燃焼制御装置の説明図。FIG. 2 is an explanatory diagram of a combustion control device of the same embodiment.
【図３】同一実施例の複数の燃焼制御方式の説明図。FIG. 3 is an explanatory diagram of a plurality of combustion control systems of the same embodiment.
【図４】同一実施例のＨｉ比例燃焼制御からＬｏ比例燃
焼制御への切換え動作のフローチャート。FIG. 4 is a flowchart of a switching operation from Hi proportional combustion control to Lo proportional combustion control in the same embodiment.
【図５】同一実施例のＬｏ比例燃焼制御からＨｉ比例燃
焼制御への切換え動作のフローチャート。FIG. 5 is a flowchart of a switching operation from Lo proportional combustion control to Hi proportional combustion control in the same embodiment.
【図６】同一実施例のＬｏ比例燃焼制御からＯＮ／ＯＦ
Ｆ燃焼制御への切換え動作のフローチャート。FIG. 6 shows the ON / OF from the Lo proportional combustion control of the same embodiment.
7 is a flowchart of a switching operation to F combustion control.
【図７】同一実施例のＯＮ／ＯＦＦ燃焼制御からＬｏ比
例燃焼制御への切換え動作のフローチャート。FIG. 7 is a flowchart of a switching operation from ON / OFF combustion control to Lo proportional combustion control in the same embodiment.
【図８】本発明の他の一実施例の構成図。FIG. 8 is a configuration diagram of another embodiment of the present invention.
１ 熱交換器 １１ 出湯温度センサ １２ バーナ部 ２９ 燃焼制御装置 DESCRIPTION OF SYMBOLS 1 Heat exchanger 11 Hot water temperature sensor 12 Burner part 29 Combustion control device
Claims (2)
れた出湯温度センサと、前記熱交換器を加熱するバーナ
部とを備え、フィードフォワード要求熱量とフィードバ
ック要求熱量とに基づく総要求熱量により燃焼量可変制
御を行うと共に、燃焼量の小さい領域では前記バーナ部
を第１燃焼制御方式で燃焼させ、また燃焼量の大きい領
域では前記バーナ部を前記第１燃焼制御方式とは異なる
第２燃焼制御方式で燃焼させるようにした給湯機の燃焼
制御装置であって、前記第１燃焼制御方式での制御状態
において、フィードフォワード要求熱量が第１基準切換
熱量以上になった場合は前記第２燃焼制御方式に切換
え、またフィードフォワード要求熱量が前記第１基準切
換熱量以下で且つ総要求熱量が前記第１基準切換熱量以
上になった場合は、燃焼量が前記第１燃焼制御方式の最
大燃焼量になった後に出湯温度から設定温度を引いた差
を演算し、この差が負の所定値以下であると前記第２燃
焼制御方式に切換えるようにしたことを特徴とする給湯
機の燃焼制御装置。1. A heat exchanger comprising: a heat exchanger; a tapping temperature sensor provided downstream of the heat exchanger; and a burner section for heating the heat exchanger. In addition to performing the combustion amount variable control based on the amount of heat, the burner unit is burned by the first combustion control system in a region where the combustion amount is small, and the burner unit is burned by the first combustion control system in a region where the combustion amount is large. A combustion control device for a water heater configured to perform combustion by a two-combustion control method, wherein in a control state of the first combustion control method, when a required feed-forward heat amount is equal to or more than a first reference switching heat amount, In the case where the combustion mode is switched to the two-combustion control mode, and the feedforward required heat quantity is equal to or less than the first reference switching heat quantity and the total required heat quantity is equal to or greater than the first reference switching heat quantity, the fuel After the burning amount reaches the maximum burning amount of the first combustion control system, a difference obtained by subtracting the set temperature from the tapping temperature is calculated, and if the difference is not more than a predetermined negative value, the system is switched to the second combustion control system. A combustion control device for a water heater, comprising:
れた出湯温度センサと、前記熱交換器を加熱するバーナ
部とを備え、フィードフォワード要求熱量とフィードバ
ック要求熱量とに基づく総要求熱量により燃焼量可変制
御を行うと共に、燃焼量の小さい領域では前記バーナ部
を第１燃焼制御方式で燃焼させ、また燃焼量の大きい領
域では前記バーナ部を前記第１燃焼制御方式とは異なる
第２燃焼制御方式で燃焼させるようにした給湯機の燃焼
制御装置であって、前記第２燃焼制御方式での制御状態
において、フィードフォワード要求熱量が第２基準切換
熱量以下になった場合は前記第１燃焼制御方式に切換
え、またフィードフォワード要求熱量が前記第２基準切
換熱量以上で且つ総要求熱量が前記第２基準切換熱量以
下になった場合は、燃焼量が前記第２燃焼制御方式の最
小燃焼量になった後に出湯温度から設定温度を引いた差
を演算し、この差が正の所定値以上であると前記第１燃
焼制御方式に切換えるようにしたことを特徴とする給湯
機の燃焼制御装置。2. A total demand based on a feedforward required heat quantity and a feedback required heat quantity, comprising a heat exchanger, a tapping temperature sensor provided downstream of the heat exchanger, and a burner unit for heating the heat exchanger. In addition to performing the combustion amount variable control based on the amount of heat, the burner unit is burned by the first combustion control system in a region where the combustion amount is small, and the burner unit is burned by the first combustion control system in a region where the combustion amount is large. A combustion control device for a water heater configured to perform combustion by a two-combustion control method, wherein in a control state of the second combustion control method, the feedforward required heat amount becomes equal to or less than a second reference switching heat amount. If the combustion mode is switched to the single combustion control mode, and the feedforward required heat quantity is equal to or more than the second reference switching heat quantity and the total required heat quantity is equal to or less than the second reference switching heat quantity, the fuel After the burning amount reaches the minimum burning amount of the second combustion control system, a difference obtained by subtracting the set temperature from the tapping temperature is calculated, and if the difference is a positive predetermined value or more, the system is switched to the first combustion control system. A combustion control device for a water heater, comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000235718A JP3869637B2 (en) | 2000-08-03 | 2000-08-03 | Water heater combustion control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2000235718A JP3869637B2 (en) | 2000-08-03 | 2000-08-03 | Water heater combustion control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JP2002048403A true JP2002048403A (en) | 2002-02-15 |
| JP3869637B2 JP3869637B2 (en) | 2007-01-17 |
Family
ID=18727889
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000235718A Expired - Fee Related JP3869637B2 (en) | 2000-08-03 | 2000-08-03 | Water heater combustion control device |
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| Country | Link |
|---|---|
| JP (1) | JP3869637B2 (en) |
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2000
- 2000-08-03 JP JP2000235718A patent/JP3869637B2/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| JP3869637B2 (en) | 2007-01-17 |
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