JP3798075B2 - Combustion equipment - Google Patents

Description

【００６７】
さらに、上記実施形態例では、給湯設定温度に対するバーナ燃焼開始時の出湯温のずれ量ΔＴを求め、点着火区分位置Ｓ_ｓに上記ずれ量ΔＴに対応する補正値Ｋを掛けて点着火区分位置Ｓ_ｓを補正していたが、他の手法により点着火区分位置Ｓ_ｓを補正してもよい。例えば、点着火区分位置Ｓ_ｓからずれ量ΔＴに対応する補正値Ｔだけ差し引いて（加えて）点着火区分位置Ｓ_ｓを補正してもよい。もちろん、演算を用いた手法以外の他の手法により点着火区分位置Ｓ_ｓを補正してもよい。
【００６８】
さらに、上記実施形態例では、図５に示す給湯単機能の給湯器を例にして説明したが、熱交換器と入水温度センサ（入水サーミスタ）と出湯湯温センサ（出湯サーミスタ）と複数段能力切り換え方式のバーナを有している燃焼機器であれば、本発明は適用することができる。例えば、風呂の湯張り機能と給湯機能を備えた燃焼機器や、風呂の湯張り機能と追い焚き機能と給湯機能を備え、追い焚き用と給湯用の別個のバーナと、各バーナに対応する熱交換器とを有した燃焼機器や、バーナが追い焚き用と給湯用の共通のバーナと成し追い焚き用と給湯用の熱交換器を別個に持ち風呂の湯張り機能と追い焚き機能と給湯機能を備えた一缶二水構成の燃焼機器にも、本発明は適用することができる。
【００６９】
【発明の効果】
この発明によれば、要求燃焼熱量演算部と点着火段設定部を設け、また、下側の燃焼段の燃焼制御特性データ上に定められた点火位置と、上側の燃焼制御特性データの点火位置との間に点着火区分位置を設けて、この点着火区分位置によってバーナの点着火時の燃焼段を設定する構成にしたので、要求燃焼熱量演算部が求めた要求燃焼熱量が点着火区分位置とその上側の点火位置の間にあるときには、上側の点火位置でバーナの点着火が行われる。このことから、従来に比べて要求燃焼熱量に対する点火位置のずれ量が小さくなるし、バーナ点着火直後に、上側の点火位置以上の燃焼熱量が要求されても、従来のように、下側の燃焼制御特性データから上側の燃焼制御特性データに切り換わって燃焼運転が行われることがない。
【００７０】
したがって、バーナ点着火直後に燃焼制御特性データの上側への切り換えに起因して燃料量の操作量が急激に低下変動するのを防止することができ、バーナへの燃料供給量の低下変動を防止することができ、この供給量の低下変動による出湯温の急激な低下変動を回避することが可能である。このことから、バーナ燃焼開始時に湯の利用者に急激な湯温変動による不快感を与えてしまうのを防止することができる。
【００７１】
また、下側の点火位置でバーナの点着火が行われた直後に、下側から上側の燃焼制御特性データに切り換わって燃焼運転が行われることはないし、仮に、バーナ点着火直後に燃焼制御特性データの上側への切り換えが行われたとしても、燃料量の操作可変量が少なくて済むことから、燃料供給量の低下変動を回避することができ、出湯湯温の急激な低下変動を防止することができる。
【００７２】
さらに、本発明は、ずれ量検出部と点着火区分位置補正部を設けた構成としたので、季節の変化等によって変動する出湯温の立ち上がり特性の変化を給湯設定温度に対する出湯温のずれ量として検出し、このずれ量を小さくする方向に点着火区分位置を自動的に学習補正できるので、季節の変化等による出湯温の立ち上がり特性の変化に起因したバーナ点着火時のアンダーシュートやオーバーシュートの問題を回避することができる。
【図面の簡単な説明】
【図１】本発明に係る実施形態例を示すブロック構成図である。
【図２】燃焼制御特性データの一例を示すグラフである。
【図３】 実施形態例に示したバーナの点着火制御を行ってバーナの点着火を行うときのガス供給量と出湯温の変化を時間の経過に従って示すタイムチャートである。
【図４】ずれ量ΔＴと補正値Ｋの関係例を示すグラフである。
【図５】給湯器のモデル例を示す説明図である。
【図６】従来の課題を示す説明図である。
【符号の説明】
２ 熱交換器
７ バーナ
10 入水サーミスタ
11 出湯サーミスタ
25 要求燃焼熱量演算部
27 点着火段設定部
32 ずれ量検出部
33 点着火区分位置補正部
48 給湯温度設定手段[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustion device having a capability-switching type burner.
[0002]
[Prior art]
FIG. 5 shows a system configuration example of a general hot water heater as a combustion device having a capability switching burner. In the figure, a water supply pipe 3 for introducing water into the heat exchanger 2 is connected to the inlet side of the heat exchanger 2, and this water supply pipe 3 has a water inlet thermistor as a water inlet temperature sensor for detecting the water inlet temperature. 10 and a flow rate sensor 9 for detecting the amount of incoming water are provided. A hot water supply pipe 4 is connected to the outlet side of the heat exchanger 2, and a hot water tap 1 is provided on the outlet side of the hot water supply pipe 4. Further, the hot water supply pipe 4 is provided with a water amount control valve 16 for variably controlling the flow rate according to the valve opening amount, and a hot water thermistor 11 as a hot water temperature sensor for detecting the hot water temperature.
[0003]
Below the heat exchanger 2 are disposed a capacity-switching type burner 7, an igniter electrode 18 for igniting the burner 7, a frame rod electrode 19 for detecting ignition, and a combustion fan 5 for supplying and exhausting air. A gas nozzle 6 is disposed opposite to the gas inlet 7, and a gas pipe 8 leading to the gas nozzle 6 has a gas proportional valve 13 for controlling the gas supply amount (fuel supply amount) by the valve opening amount, and opens and closes the pipeline. A gas solenoid valve 12 to be performed, a solenoid valve 44, and a capacity switching solenoid valve 45 are interposed.
[0004]
The gas chamber of the gas nozzle 6 is divided into two by a partition wall 46, and by closing the capacity switching solenoid valve 45, the burner 7 has a small capacity (first combustion stage) one-side combustion state (side A single combustion state) When the capacity switching solenoid valve 45 is opened, a two-sided combustion state (A and B double-sided combustion state) with a large capacity (second combustion stage) is established. By opening and closing the solenoid valve 45, the amount of combustion heat ( (Combustion capacity) can be switched. As described above, the burner 7 has two combustion surfaces (A surface and B surface), and is configured as a multi-stage capacity switching type burner in which each combustion surface is switched according to the combustion capacity.
[0005]
This type of water heater is provided with a control device 14, and a remote control 15 is connected to the control device 14. The remote control 15 has a hot water supply temperature setting means 48 such as a button for setting a hot water supply temperature and a hot water supply set temperature. The display section is provided. The control device 14 controls the hot water supply operation of the water heater. When the hot water tap 1 is opened, the flow rate sensor 9 detects the amount of incoming water, and when the incoming water amount exceeds a certain level (above the minimum operating flow rate). In response to the signal from the flow sensor 9, the control device 14 rotates the combustion fan 5, opens the gas solenoid valve 12, the gas proportional valve 13, the solenoid valve 44, etc., and supplies gas to the burner 7, and the igniter electrode. Ignition operation by 18 is performed. When the flame rod electrode 19 detects the ignition of the gas, the control device 14 performs feedforward control so that the tapping temperature is set to the set temperature, changes the valve opening amount of the gas proportional valve 13, and exits the heat exchanger 2. Control is performed so that the hot water temperature becomes a set temperature, and after a predetermined time has elapsed since the stability of the hot water temperature has been detected, combustion control is performed by combined control of feedforward control and feedback control.
[0006]
The hot water heater is provided with hot water combustion ability, and the hot water heater performs combustion control so that the hot water temperature is set to a set temperature within the range of the combustion capacity. The combustion capacity given to the water heater is given by the number, and No. 1 means the combustion capacity required to raise 1 liter of water by 25 ° C. per minute.
[0007]
In other words, the number is expressed by the formula: incoming water amount (liter / minute) × {hot water temperature (° C.) − Incoming water temperature (° C.)} ÷ 25. In addition, since the tapping temperature becomes equal to the set temperature, the number may be calculated using the set temperature instead of the tapping temperature. For example, when the incoming water volume is 24 liters / minute, the hot water temperature is 40 ° C., and the incoming water temperature is 15 ° C., the combustion capacity of the hot water heater is given as No. 24 by the above formula.
[0008]
When the combustion capacity is given as a specification value, combustion control characteristic data as shown in FIG. As shown in the figure, the combustion control characteristic data is represented by a combustion control characteristic line L for small capacity (for A-side single combustion) on a graph in which the abscissa represents the fuel supply operation amount and the ordinate represents the combustion heat amount.₁And combustion control characteristic line L for large capacity (A / B double side combustion)₂Each characteristic line L₁, L₂Both of them function as linear characteristic data for variably controlling the gas supply amount by varying the operation amount within the range of 0% to 100%.
[0009]
2 corresponds to the opening amount of the gas proportional valve 13, and in the first stage A-side single combustion operation state in which the capacity switching solenoid valve 45 is closed, the operation amount is 100. The valve opening drive current of the gas proportional valve 13 is set so that the gas supply amount corresponding to the combustion heat amount at point B is supplied to the burner 7 at the position of%, and the combustion heat amount A point at the position of 0% operation amount. The valve opening drive current of the gas proportional valve 13 is set so that a gas supply amount corresponding to the combustion heat amount is supplied to the burner 7.
[0010]
Similarly, at the time of the second stage A / B double side combustion operation with the ability switching solenoid valve 45 opened, the characteristic line L at 100% manipulated value.₂When the gas supply amount corresponding to the combustion heat quantity at point D is 0%, the gas supply quantity corresponding to the combustion heat quantity at point C is supplied to the burner 7, and the operation amount is 100%. The valve opening drive current at the position of% is set respectively. The valve opening amount of the gas proportional valve 13 is proportional to the magnitude of the valve opening drive current, the magnitude of the valve opening drive current changes according to the magnitude of the manipulated variable, and the gas quantity corresponding to the manipulated variable changes to the burner. 7 is supplied. Further, the rotational operation of the combustion fan 5 is controlled by the magnitude of the manipulated variable, and the air volume suitable for the burned quantity is supplied by the manipulated variable.
[0011]
In this type of capacity switching type water heater, the first stage characteristic line L₁When a combustion operation is performed at point B along the line B, when a combustion heat quantity larger than the combustion heat quantity at this point B is required, the second characteristic line L₂S_aJump to the point (B and S_aThe point of combustion heat is equal), characteristic line L₂The combustion operation is performed according to the above. Conversely, the second line L₂When a combustion operation is performed at point C, and a smaller amount of combustion heat is required, the first stage line L₁S_bJump to point (C point and S_bThe point of combustion heat is equal), characteristic line L₁The combustion operation is performed according to the above.
[0012]
Normally, characteristic line L₁Characteristic line L from point B₂S_aThe part that flies to the point and the characteristic line L₂Characteristic line L from point C₁S_bThe part that flies to the point has an overlap of X₁, X₂And the characteristic line L₁, L₂The jump between them is done smoothly. This overlap fee X₁, X₂If, for example, characteristic line L₁To characteristic line L₂When the flow rate fluctuates due to fluctuations in water pressure, etc., and the required amount of combustion heat slightly fluctuates and falls, the characteristic line L₂To L₁As the flow rate fluctuates, the characteristic line L₁, L₂There is a problem that a so-called hunting phenomenon that frequently reciprocates between them occurs, but as shown in FIG.₁, L₂Overlap allowance X jumping in between₁, X₂Characteristic line L₁, L₂Can be switched smoothly.
[0013]
[Problems to be solved by the invention]
  By the way, combustion control characteristic data L₁, L₂The ignition operating point (ignition position) E₁, E₂Are given respectively. This ignition operating point E₁, E₂Is the gas supply when the burner 7 is ignitedAmountThis is the operating point of ignition.
[0014]
The control device 14 obtains a required combustion heat amount (FF amount) necessary for raising the incoming water temperature to the hot water supply set temperature immediately before the ignition of the burner 7, and this required combustion heat amount is the ignition operation point E.₂When the combustion heat quantity is lower than the above, the ignition operation point E of the lower combustion stage is₁Then, ignite the burner 7. That is, the ignition operating point E₁Is the first characteristic line L₁Since it is above, it indicates that combustion is performed on the A side alone, so the control device 14 opens the gas solenoid valve 12 and the solenoid valve 44 (the capacity switching valve 45 remains closed). , Ignition operating point E₁A valve opening drive current corresponding to 0% of the manipulated variable is supplied to the gas proportional valve 13 to supply gas to the A surface of the burner 7, and the burner 7 is ignited.
[0015]
Further, the required amount of combustion heat is the ignition operation point E.₂Is the ignition operation point E of the upper combustion stage₂That is, the gas solenoid valve 12, the solenoid valve 44, and the capacity switching valve 45 are opened so that A / B double-side combustion is possible, and the ignition operating point E₂A valve opening driving current corresponding to 0% of the operation amount is supplied to the gas proportional valve 13 and supplied to both sides A and B of the gas burner 7, so that the burner 7 is ignited.
[0016]
  However, if the hot water temperature immediately after ignition of the burner 7 is much lower than the hot water supply set temperature, as shown in FIG. 6B, the amount of combustion heat required for the burner 7 may be significantly increased. In this case, the required amount of combustion heat (FF amount) obtained immediately before the ignition of the burner is, for example, an ignition operation point E as shown by an FF point shown in FIG.₂When the value is slightly lower than the ignition operation point E₁The spot line of the burner 7 is ignited and the characteristic line L₁I tried to perform the combustion operation according toActually, in order to make the hot water temperature to the hot water supply set temperature,Required combustion heat is characteristic line L₁Immediately after point ignition of the burner 7, for example, the first stage characteristic data L₁Characteristic data L at the second stage from point F₂Jump to F 'point of combustion control characteristic data L₂The combustion operation is performed according to the above. As described above, the lower characteristic data L₁Upper characteristic data L₂When the engine jumps to (when the combustion stage is switched), the capacity switching solenoid valve 45 is opened to enter the A / B double-side combustion state, and at the same time, as shown in FIG. %, The gas supply amount to the burner 7 greatly decreases immediately after the burner ignition, as shown in the M position in FIG. 6 (a). As a result, as shown at the N position in FIG. Thus, if the combustion stage moves from the lower side to the upper side when the burner 7 is ignited, the hot water temperature fluctuation becomes very large at the start of hot water supply, and there is a possibility that the hot water user may feel uncomfortable due to the hot water temperature fluctuation. there were.
[0017]
The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a combustion device capable of preventing combustion stage switching at the time of burner point ignition and suppressing fluctuations in the temperature of discharged hot water at the start of hot water supply. It is to provide.
[0018]
[Means for Solving the Problems]
In order to achieve the above object, the present invention has the following configuration as means for solving the above problems.
[0019]
  That is,BookThe present invention relates to a heat exchanger that heats water to be passed, an incoming water temperature sensor that detects the temperature of incoming water that flows into the heat exchanger, and a hot water temperature sensor that detects hot water temperature on the outlet side of the heat exchanger. And a hot water supply temperature setting means for setting a hot water supply set temperature of hot water heated and discharged by the heat exchanger, and a burner for combustion heating the heat exchanger by spot ignition, the burner having a plurality of combustion The combustion control characteristic data indicating the relationship between the fuel supply amount and the combustion heat amount is given for each combustion stage. The combustion equipment has a required combustion calorific value calculation unit for obtaining the required combustion calorific value required to raise the incoming water temperature to the hot water supply set temperature at the start of burner combustion, and the ignition position is indicated on the combustion control characteristic data of each stage. Constant Point ignition for distinguishing the stage to be ignited at the start of burner combustion between the ignition position of the combustion control characteristic data of the lower combustion stage and the ignition position of the combustion control characteristic data of the upper combustion stage When the required combustion heat quantity obtained by the required combustion heat quantity calculation unit is equal to or higher than the above-mentioned ignition point classification position, spot ignition is performed at the ignition position of the upper combustion control characteristic data, and the required combustion heat quantity is A point ignition stage setting unit is provided for performing point ignition at the ignition position of the lower combustion control characteristic data when the position is less than the point ignition division position.Furthermore, the hot water temperature detected by the hot water temperature sensor detected at the start of burner combustion and the hot water temperature set in the hot water temperature setting means are taken in, and the hot water temperature at the start of burner combustion deviates from the hot water temperature setting. A deviation amount detection unit that detects a deviation amount; a point ignition division position correction unit that corrects the point ignition division position in a direction to reduce the deviation amount detected by the deviation amount detection unit based on calculation data given in advance; HaveThe configuration serves as means for solving the above-described problems.
[0021]
In the invention having the above-described configuration, for example, the required combustion heat quantity calculation unit is necessary to increase the incoming water temperature detected by the incoming water temperature sensor to the hot water supply set temperature set in the hot water supply temperature setting means immediately before the start of burner combustion. Obtain the required amount of combustion heat (required combustion capacity).
[0022]
The burner is a multistage capability switching type burner having a plurality of combustion surfaces, and combustion control characteristic data is predetermined for each combustion stage, and an ignition position is provided on each combustion control characteristic data. At the same time, spot ignition division positions are provided between the ignition positions.
[0023]
The point ignition stage setting unit compares the required combustion heat amount obtained by the required combustion heat amount calculation unit with the combustion heat amount at the point ignition division position, and determines that the required combustion heat amount is equal to or higher than the point ignition division position. The burner is ignited at the ignition position of the upper combustion control characteristic data. When the point ignition stage setting unit determines that the required combustion heat amount is less than the point ignition division position, the burner is ignited at the ignition position of the lower combustion control characteristic data.
[0024]
As described above, a point ignition division position is provided between the upper ignition position and the lower ignition position, and by dividing the combustion stage in which the burner is ignited by this point ignition division position, for example, burner combustion When the required combustion calorific value obtained immediately before is between the point ignition division position and the upper ignition position, the burner will be ignited at the upper ignition position. The amount of deviation of the ignition position with respect to is reduced.
[0025]
Moreover, even if the required combustion heat quantity is increased to the upper ignition position or higher immediately after the point ignition of the burner combustion, switching from the lower side to the upper side combustion control characteristic data is not performed, and the characteristic data can be switched. It is possible to avoid a sudden decrease and fluctuation in the manipulated amount of the fuel amount, and a sudden decrease and decrease in the fuel supply amount is prevented.
[0026]
Further, even when switching from the upper side to the lower side combustion control characteristic data is performed, the amount of operation of the fuel amount changes in an increasing direction, so that a sudden decrease in the fuel supply amount does not occur. Therefore, immediately after the burner point ignition, a rapid decrease in the fuel supply amount due to the switching of the characteristic data is prevented, and a sudden tapping temperature variation is avoided.
[0027]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments according to the present invention will be described below with reference to the drawings.
[0028]
  In FIG.The present inventionThe block configuration showing the embodiment example ofIndicationHas been. Each block component shown in FIG. 1 is incorporated in the controller 14 of the water heater shown in FIG. In addition, since the system configuration of the water heater in FIG. 4 has been described above, redundant description thereof will be omitted.
[0029]
  ThisThe fruitIn the embodiment, as shown in FIG. 1, the control device 14 includes a required combustion heat amount calculation unit 25, a data storage unit 26, a spot ignition stage setting unit 27, a combustion control unit 28, and a proportional valve drive unit 29. And a capability switching control unit 30.
[0030]
Further, in this embodiment, the flow rate sensor 9 is configured to output an incoming water detection signal to the required combustion heat amount calculation unit 25 and the combustion control unit 28 when the incoming water amount is equal to or higher than a predetermined minimum operating flow rate. Has been.
[0031]
The data storage unit 26 stores the combustion control characteristic data L as described above.₁, L₂Is predetermined for each combustion stage, and the characteristic data L₁, L₂Above is the ignition position E₁, E₂Is stipulated. In this embodiment example, the ignition position E₁, E₂Is each characteristic data L₁, L₂Is determined at a position where the predetermined minimum operation amount is 0%.
[0032]
Further, the data storage unit 26 has a spot ignition division position S._sIs stored, and this ignition point position S_sIs the ignition position E on the graph shown in FIG.₁, E₂On the straight line that passes through both (in this case, the position where the operation amount is 0%), the ignition position E₁And E₂It is provided in the position between. Further, the data storage unit 26 stores in advance FF amount calculation formula data for obtaining a required combustion heat amount necessary to raise the incoming water temperature to the hot water supply set temperature.
[0033]
When the hot water tap 1 is opened, the flow rate sensor 9 detects the incoming water and outputs the incoming water detection signal, the required combustion calorific value calculation unit 25 receives the received water temperature and the hot water temperature setting means detected by the incoming water thermistor 10. The hot water supply set temperature set to 48 and the FF amount calculation formula data stored in the data storage unit 26 are fetched. Then, the required combustion heat amount calculation unit 25 calculates a combustion heat amount (hereinafter referred to as FF amount) necessary to increase the incoming water temperature to the hot water supply set temperature based on the above-described incoming water temperature, hot water supply set temperature, and FF amount calculation formula data. The calculation is performed, and the data signal of this FF amount is output to the spot ignition stage setting unit 27.
[0034]
When the ignition stage setting unit 27 receives the FF amount data signal from the required combustion heat amount calculation unit 25, the ignition point classification position S stored in the data storage unit 26 is received._sCombustion heat quantity S_sThe above FF amount and combustion heat amount S are read out._sCompare The point ignition stage setting unit 27 determines that the FF amount is the combustion heat amount S._sWhen it is determined that (FF amount ≧ S_s), Ignition position E of the upper combustion stage₂Is determined to perform point ignition of the burner 7, and the ignition position E₂E to make the burner 7 ignite₂An ignition command signal is output to the combustion control unit 28.
[0035]
Further, the spot ignition stage setting unit 27 has the FF amount as the combustion heat amount S._sWhen it is determined that the value is less than (FF amount <S_s), Ignition position E₁Is determined to perform point ignition of the burner 7, and the ignition position E₁E to make the burner 7 ignite₁An ignition command signal is output to the combustion control unit 28.
[0036]
After receiving the water entry detection signal from the flow sensor 9, the combustion control unit 28 receives E from the point ignition stage setting unit 27.₂When the ignition command signal is received, the ignition position E stored in the data storage unit 26 is received.₂Read the data. This ignition position E₂Since the operation amount of the gas proportional valve 13 is 0%, the combustion control unit 28 outputs a data signal indicating this operation amount 0% to the proportional valve drive unit 29, and the proportional valve drive unit 29 operates the operation amount. A valve opening drive current corresponding to 0% is supplied to the gas proportional valve 13.
[0037]
At the same time, the ignition position E₂Is the second stage combustion control characteristic data L₂Therefore, the combustion control unit 28 determines that the burner combustion is performed on both sides A and B, outputs the A / B double side combustion signal to the capability switching control unit 30, and the capability switching control unit 30 outputs the capability switching electromagnetic wave. While opening the valve 45, the combustion control unit 28 opens the gas solenoid valve 12 and the solenoid valve 44, and starts supplying gas to both sides A and B of the burner 7. The combustion control unit 28 has a built-in timer, and ignites the burner 7 by the igniter electrode 18 when a predetermined time has elapsed since the gas electromagnetic valve 12 was opened.
[0038]
The combustion controller 28 receives the incoming detection signal from the flow sensor 9 and then receives the E-stage from the ignition stage setting unit 27.₁When the ignition command signal is received, the ignition position E stored in the data storage unit 26 is received.₁Read the data. This ignition position E₁Since the operation amount of the gas proportional valve 13 is 0%, the combustion control unit 28 outputs a data signal indicating this operation amount 0% to the proportional valve drive unit 29 in the same manner as described above, and the proportional valve drive unit By 29, a valve opening drive current corresponding to an operation amount of 0% is supplied to the gas proportional valve 13.
[0039]
At the same time, the ignition position E₁Is the first stage combustion control characteristic data L₁Therefore, the combustion controller 28 determines that burner combustion is performed on the A side alone, opens only the gas solenoid valve 12 and the solenoid valve 44, and starts supplying gas only to the A side of the burner 7. Similarly to the above, the burner 7 is ignited by the igniter electrode 18 when a predetermined time has elapsed. At this time, the capability switching electromagnetic valve 45 is maintained in a closed state by the capability switching control unit 30.
[0040]
Of course, when the combustion control unit 28 performs ignition of the burner 7, the ignition position E₁Or E₂The rotation of the combustion fan 5 is controlled so that the amount of air corresponding to the amount of combustion heat is supplied to the burner 7.
[0041]
By the way, the point ignition division position S_sIgnition position E₁If it is too close to the FF amount, the ignition position E₁Despite being close to the ignition position E₂In this case, a point ignition of the burner 7 occurs. In this case, the ignition position E with respect to the FF amount₂There is a problem of overshoot in which the amount of deviation is large and hot water considerably higher than the hot water supply set temperature is discharged. In addition, spot ignition classification position S_sIgnition position E₂If the temperature is too close to the temperature, conversely to the above, there will be an undershoot problem that hot water that is considerably lower than the hot water supply temperature continues to come out after the ignition of the burner.
[0042]
From this, the spot ignition division position S_sThe optimum position where both the undershoot and overshoot problems can be avoided is obtained and set by experiments and calculations. For example, the present inventor₁The combustion heat quantity of No. 3 is ignition position E₂In the hot water heater as shown in FIG._sWhen an experiment was performed to determine the ignition point position S_sThe optimal value of was 5.5. This value is substantially the same as the predetermined minimum amount of combustion heat when using the shower when hot water is assumed to be used in the shower.
[0043]
According to this example embodiment, the ignition position E₁, E₂Point ignition position S during_sThis spot ignition division position S_sSince the combustion stage at the time of spot ignition of the burner 7 is set by the_sAnd upper ignition position E₂The upper ignition position E₂Since the ignition of the burner 7 is performed at this time, the amount of deviation of the ignition position with respect to the FF amount is reduced compared to the conventional case, and the ignition position E immediately after the ignition of the burner 7 is reduced.₂When a combustion heat amount higher than the combustion heat amount is required, the upper characteristic data L₂Therefore, immediately after the ignition of the burner 7, the lower characteristic data L₁Upper characteristic data L₂The combustion operation is not performed by switching to.
[0044]
Accordingly, there is no sudden change in the manipulated variable due to the upward switching of the characteristic data, that is, there is no change in the gas supply amount of the burner 7 as shown by the solid line curve β in FIG. Thus, the hot water temperature does not suddenly drop and fluctuate at the start of hot water supply, and it is possible to prevent the hot water user from feeling uncomfortable due to fluctuations in the hot water temperature.
[0045]
In addition, the ignition position E is higher than the FF amount.₂By starting the combustion of the burner 7 with the amount of combustion heat of, it is possible to raise the hot water temperature to the hot water supply set temperature earlier at a cold start or the like.
[0046]
By the way, the upper ignition position E₂After the ignition of the burner 7 is performed, the ignition position E₂When a lower combustion heat quantity is required, naturally, the upper characteristic data L₂Characteristic data L below₁In this way, when switching from the upper side to the lower side characteristic data, the operation amount of the gas proportional valve 13 is variably controlled in the increasing direction, so the burner 7 As shown by the solid curve α in FIG. 3A, the gas supply amount to the gas changes slowly and does not fluctuate rapidly, and fluctuations in the tapping temperature due to fluctuations in the gas supply amount are prevented. .
[0047]
Further, the FF amount is equal to the ignition position E.₁And spot ignition classification position S_sWhen it is between, the ignition position E₁In this case, the ignition of the burner 7 is performed, and immediately after the ignition of the burner, the combustion data is not switched from the lower side to the upper side characteristic data. Even if the characteristic data is switched to the upper side, The amount of change in the operation amount of the gas proportional valve 13 can be reduced, so that the gas supply amount does not change sharply, and the hot water temperature can be prevented from changing rapidly.
[0048]
  thisWhat is characteristic in the embodiment isThe figureAs indicated by the dotted line 1, a deviation amount detection unit 32 and a point ignition segment position correction unit 33 are provided. At the start of burner combustion, the point ignition segment position based on the amount of deviation of the hot water temperature with respect to the hot water supply set temperature. S_sIt has a learning function that automatically corrects the position of.
[0049]
When the deviation amount detection unit 32 detects that the ignition of the burner 7 has been achieved based on the control operation information of the frame rod electrode 19 or the combustion control unit 28, the hot water temperature detected by the hot water thermistor 11 and the hot water supply temperature setting means Take in the hot water supply set temperature set to 48.
[0050]
The deviation detection unit 32 has a hot water supply set temperature T_sHot spring temperature T_outIs calculated as a deviation amount calculation formula data (ΔT = T) for calculating a deviation amount ΔT in which the tapping temperature deviates from the hot water supply set temperature_s-T_out) Is provided, and the deviation amount detection unit 32 calculates the deviation amount ΔT by substituting the taken out hot water temperature and hot water supply set temperature into the deviation amount calculation formula data, and calculates the deviation amount ΔT. The data signal is output to the point ignition classification position correction unit 33.
[0051]
As shown in FIG. 1, the spot ignition classification position correction unit 33 includes a correction value determination unit 34 and a correction / automatic update unit 35, and the deviation amount ΔT output by the deviation amount detection unit 32 is calculated. The data signal is formed so that the correction value determination unit 34 receives the data signal.
[0052]
When the correction value determination unit 34 receives the data signal of the deviation amount ΔT output from the deviation amount detection unit 32, the correction value determination unit 34 reads the correction value data stored in the data storage unit 26 in advance. This correction value data indicates the relationship between the deviation amount ΔT and the correction value K as shown in FIG. 4 and is obtained in advance by experiments, calculations, etc., and is shown in FIG. 4 as graph data, table data, and calculation formula data. Or the like in the data storage unit 26.
[0053]
The correction value K is the ignition point position S_sOf combustion heat S_sIs applied to the point ignition division position S in the direction in which the shift amount ΔT becomes smaller._sAs the amount of deviation ΔT increases in the positive direction (underside direction) (as the tapping temperature shifts downward from the hot water supply set temperature and the degree of undershoot increases), the point ignition division position S_sIs corrected in the direction in which the amount of heat of combustion decreases (in the direction of decreasing undershoot), and on the contrary, the amount of deviation ΔT increases in the negative direction (over-side direction) As the degree of chute increases), the spot ignition segment position S_sIs corrected in the direction in which the amount of combustion heat increases (the direction in which the overshoot is reduced).
[0054]
When reading the correction value data, the correction value determination unit 34 determines a correction value K corresponding to the deviation amount ΔT based on the correction value data and the deviation amount ΔT data, and corrects the correction value K data. -Output to the automatic update unit 35.
[0055]
When the correction / automatic update unit 35 receives the data signal of the correction value K from the correction value determination unit 34, the ignition / ignition position S stored in the data storage unit 26 is received._sOf combustion heat S_sThe data of the combustion heat S_sIs multiplied by the correction value K and integrated. The correction / automatic update unit 35 uses the integrated value as the combustion heat amount S in the data storage unit 26._sIs overwritten and stored in the position of ignition point S_sIs automatically corrected and updated.
[0056]
  According to this example embodimentZThe amount detection section 32 and the spot ignition section position correction section 33 are provided, and the spot ignition section position S according to the amount of deviation ΔT of the tapping temperature relative to the hot water supply set temperature at the start of burner combustion._sIs set to correct the point ignition division position S_sCan be automatically corrected, and the following problems can be prevented.
[0057]
For example, when summer and winter are compared, there is a big difference in the outside air temperature around the water heater, so that when the burner 7 is ignited under conditions other than the outside air temperature, it is affected by the outside air temperature. Thus, there is a difference in the rising characteristics of the hot spring temperature between summer and winter. For this reason, the same spot ignition position S in both summer and winter_sWhen the point ignition control of the burner 7 is performed using, for example, the optimal point ignition of the burner 7 was performed in winter, and the problems of undershoot and overshoot were almost avoided, but the problem of overshoot in summer Point ignition division position S due to large fluctuations in the outside air temperature_sMay be deviated from the optimum value.
[0058]
In this embodiment example, a change in rising characteristics of the hot water temperature that changes due to a seasonal change or the like is detected as a deviation amount ΔT of the hot water temperature with respect to the set temperature of the hot water supply, and in the direction of reducing the deviation amount ΔT, as described above, Ignition division position S_sTherefore, it is possible to reliably avoid the possibility of the above-mentioned problem.
[0060]
  The present invention isRealThe present invention is not limited to the embodiment, and various embodiments can be adopted. For example, onRealIn the embodiment, as shown in FIG. 5, the case where the burner 7 has two combustion surfaces (A surface and B surface) has been described as an example. However, in the present invention, combustion with three or more burners 7 is performed. The present invention can also be applied to a combustion apparatus having a surface and having a capacity switching type burner having three or more stages.
[0061]
For example, if the burner 7 is a three-stage capacity switching type burner, the first stage characteristic data L as shown by the solid line in FIG.₁And second stage characteristic data L₂And the third stage characteristic data L as shown by the chain line in FIG._ThreeIs given in advance, and the above characteristic data L₁, L₂, L_ThreeAbove is the ignition position E₁, E₂, E_ThreeAre provided respectively. Ignition position E₁, E₂Between the ignition point position S between_sIs the ignition position E₂, E_ThreeBetween the ignition point position S between_rAre set respectively.
[0062]
  Up just before burner burningRealThe required amount of combustion heat (FF amount) calculated in the same manner as the embodiment is the ignition position E.₁Above, point ignition division position S_sIs less than (E₁≦ FF amount <S_s), Ignition position E₁Then, ignite the burner 7. When the FF amount is equal to or greater than the point ignition segment position Ss and less than the point ignition segment position Sr (S_s≦ FF amount <S_r), Ignition position E₂The point 7 is ignited by the burner 7 and the FF amount is the point ignition division position S._rWhen it is above (FF amount ≧ S_r), Ignition position E₃Then, ignite the burner 7.
[0063]
  As mentioned above, even in a capacity switching type burner with three or more stages,RealAs in the embodiment, a point ignition division position is provided between the ignition position of the lower characteristic data and the ignition position of the upper characteristic data, and the ignition position is determined by the point ignition division position and the FF amount, thereby The same excellent effects as those of the embodiments can be obtained.
[0064]
  Also onRealIn the embodiment, the characteristic data L₁, L₂The ignition position E₁, E₂However, the ignition position may be provided at another position. For example, as shown in FIG.₁', E₂′ May be provided, in which case the ignition position E₁', E₂Point ignition position S at a position between ′_s'Will be provided.
[0065]
  Furthermore, onRealIn the embodiment, the FF amount and the spot ignition division position S_sThe ignition position was determined based on the comparison result.For example, table data and graph data as shown in Table 1 are given in advance, and the FF amount is collated with the given data. Thus, the ignition position may be determined.
[0066]
[Table 1]

[0067]
  Furthermore, onRealIn the embodiment, the amount ΔT of the hot water temperature at the start of burner combustion with respect to the hot water supply set temperature is obtained, and the ignition point position S_sIs multiplied by the correction value K corresponding to the deviation amount ΔT to ignite the ignition position S_sWas corrected, but the point ignition division position S was determined by other methods._sMay be corrected. For example, the ignition point position S_sBy subtracting (in addition to) the correction value T corresponding to the deviation amount ΔT from the ignition point position S_sMay be corrected. Of course, the ignition point position S can be determined by a method other than the method using the calculation._sMay be corrected.
[0068]
  Furthermore, onRealIn the embodiment, the hot water heater having a single function of hot water shown in FIG. 5 has been described as an example. However, the heat exchanger, the incoming water temperature sensor (incoming thermistor), the outgoing hot water temperature sensor (outlet hot water thermistor), and the multistage capability switching system The present invention can be applied to any combustion device having a burner. For example, combustion equipment with bath hot water function and hot water supply function, bath hot water function, reheating function and hot water supply function, separate burner for hot water supply and hot water supply, and heat corresponding to each burner Combustion equipment with an exchanger, a burner with a common burner for reheating and hot water supply, a separate heat exchanger for reheating and hot water supply, and hot water filling function, reheating function and hot water supply The present invention can also be applied to a combustion apparatus having a single can / two water structure having a function.
[0069]
【The invention's effect】
According to the present invention, the required combustion heat amount calculation unit and the spot ignition stage setting unit are provided, and the ignition position determined on the combustion control characteristic data of the lower combustion stage and the ignition position of the upper combustion control characteristic data Since the combustion stage at the time of spot ignition of the burner is set based on this point ignition section position, the required combustion heat amount obtained by the required combustion heat amount calculation unit is the point ignition section position. And the upper ignition position, the burner is ignited at the upper ignition position. From this, the amount of deviation of the ignition position with respect to the required combustion heat amount is smaller than in the conventional case, and even if the combustion heat amount equal to or higher than the upper ignition position is required immediately after the burner point ignition, The combustion operation is not performed by switching from the combustion control characteristic data to the upper combustion control characteristic data.
[0070]
Therefore, it is possible to prevent the manipulated value of the fuel amount from rapidly decreasing due to the switching to the upper side of the combustion control characteristic data immediately after the ignition of the burner point, and to prevent the fuel supply amount to the burner from decreasing. Therefore, it is possible to avoid a rapid decrease in the hot water temperature due to a decrease in the supply amount. From this, it is possible to prevent the hot water user from feeling uncomfortable due to a rapid fluctuation of the hot water temperature at the start of burner combustion.
[0071]
Also, immediately after the ignition of the burner is performed at the lower ignition position, the combustion control characteristic data is not switched from the lower side to the upper combustion control characteristic data, and the combustion control is performed immediately after the burner ignition. Even if the characteristic data is switched to the upper side, it is possible to avoid fluctuations in the fuel supply amount and prevent sudden fluctuations in the tapping water temperature because only a small amount of fuel can be manipulated. can do.
[0072]
  Furthermore, the present invention providesConfiguration with a displacement detection unit and a spot ignition classification position correction unitBecauseBecause the change in the rising characteristics of the hot water temperature, which varies with seasonal changes, etc., is detected as the amount of deviation of the hot water temperature relative to the hot water supply set temperature, and the ignition point position can be automatically learned and corrected in a direction to reduce this amount of deviation, It is possible to avoid problems such as undershoot and overshoot at the time of ignition of the burner due to changes in rising characteristics of the hot water temperature due to seasonal changes and the like.
[Brief description of the drawings]
FIG. 1 is a block diagram showing an embodiment according to the present invention.
FIG. 2 is a graph showing an example of combustion control characteristic data.
[Fig. 3]FruitIt is a time chart which shows the change of the gas supply amount and the tapping temperature when performing the spot ignition control of the burner shown in the embodiment and performing the spot ignition of the burner as time elapses.
FIG. 4 is a graph showing an example of the relationship between a deviation amount ΔT and a correction value K.
FIG. 5 is an explanatory view showing a model example of a water heater.
FIG. 6 is an explanatory diagram showing a conventional problem.
[Explanation of symbols]
2 Heat exchanger
7 Burner
10 Water thermistor
11 Hot spring thermistor
25 Required combustion heat quantity calculation section
27-point ignition stage setting section
32 Deviation detection unit
33-point ignition classification position correction section
48 Hot water temperature setting means

Claims (1)

A heat exchanger for heating the water to be passed, an incoming water temperature sensor for detecting the temperature of the incoming water flowing into the heat exchanger, a hot water temperature sensor for detecting the hot water temperature on the outlet side of the heat exchanger, and the above Hot water supply temperature setting means for setting a hot water supply set temperature of hot water heated and discharged by a heat exchanger, and a burner that burns and heats the heat exchanger by spot ignition, and this burner has a plurality of combustion surfaces. Combustion equipment in which each combustion surface is a multistage capability switching type burner that switches according to the amount of combustion heat, and combustion control characteristic data indicating the relationship between the fuel supply amount and the combustion heat amount is given for each combustion stage , A required combustion calorific value calculation unit for obtaining a required combustion calorific value required to raise the incoming water temperature to the hot water supply set temperature at the start of burner combustion, and the ignition position is determined on the combustion control characteristic data of each stage. The ignition position of the ignition point for dividing the ignition stage at the start of burner combustion between the ignition position of the combustion control characteristic data of the lower combustion stage and the ignition position of the combustion control characteristic data of the upper combustion stage Is provided, and when the required combustion heat amount obtained by the required combustion heat amount calculation unit is equal to or higher than the point ignition division position, point ignition is performed at the ignition position of the upper combustion control characteristic data, and the required combustion heat amount is A point ignition stage setting unit that performs point ignition at the ignition position of the lower combustion control characteristic data when it is less than the ignition division position is provided , and the hot water temperature and the hot water temperature detected by the hot water temperature sensor at the start of burner combustion A deviation amount detection unit that detects a deviation amount in which the hot water temperature at the start of burner combustion deviates from the hot water supply temperature; Combustion equipment characterized by having a; shift amount and the smaller to the direction to the point ignition division position previously given calculation data ignition division position correction unit that corrects, based on the.

Images