JPH03156209A - Combustion control device - Google Patents
Combustion control deviceInfo
- Publication number
- JPH03156209A JPH03156209A JP1293355A JP29335589A JPH03156209A JP H03156209 A JPH03156209 A JP H03156209A JP 1293355 A JP1293355 A JP 1293355A JP 29335589 A JP29335589 A JP 29335589A JP H03156209 A JPH03156209 A JP H03156209A
- Authority
- JP
- Japan
- Prior art keywords
- proportional valve
- flame
- motor
- burner
- fan motor
- 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.)
- Pending
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 31
- 230000007423 decrease Effects 0.000 claims abstract description 17
- 239000000446 fuel Substances 0.000 claims abstract description 15
- 238000001514 detection method Methods 0.000 claims description 10
- 230000002159 abnormal effect Effects 0.000 abstract description 8
- 230000003247 decreasing effect Effects 0.000 abstract description 5
- 239000007789 gas Substances 0.000 description 9
- 238000010586 diagram Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 229910002092 carbon dioxide Inorganic materials 0.000 description 1
- 239000001569 carbon dioxide Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000003208 petroleum Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
- F23N5/12—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods
- F23N5/123—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using ionisation-sensitive elements, i.e. flame rods using electronic means
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/02—Regulating fuel supply conjointly with air supply
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2233/00—Ventilators
- F23N2233/06—Ventilators at the air intake
- F23N2233/08—Ventilators at the air intake with variable speed
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/16—Fuel valves variable flow or proportional valves
Abstract
Description
【発明の詳細な説明】
［発明の目的］
（産業上の利用分野）
本発明は、燃焼用空気量の調整用ファンモータの回転数
とバーナへの燃料供給調整用の比例弁の開度を制御する
燃焼制御装置に係り、特にファンモータの回転数と比例
弁の開度の減少時に吹き消えや逆火等の異常燃焼が発生
しにくくなる燃焼制御装置に関するものである。[Detailed Description of the Invention] [Object of the Invention] (Industrial Application Field) The present invention provides a system for adjusting the rotation speed of a fan motor for adjusting the amount of combustion air and the opening degree of a proportional valve for adjusting the fuel supply to the burner. The present invention relates to a combustion control device that controls combustion, and particularly to a combustion control device that prevents abnormal combustion such as blowout and backfire from occurring when the rotational speed of a fan motor and the opening degree of a proportional valve decrease.
（従来の技術）
燃焼制御装置は、燃焼用空気量の調整用ファンモータの
回転数とバーナへの燃料供給調整用の比例弁の開度を制
御するものである。その制御は、最少設定・入力（燃料
供給量）と最大設定入力との間を何分側（例えば１００
分割し、そのポイントを１０ポイント程度に設定する）
して、その入力に応じて燃焼用空気量を制御し、燃焼用
空気と燃料の比率がほぼ一定になるようにする。(Prior Art) A combustion control device controls the rotation speed of a fan motor for adjusting the amount of combustion air and the opening degree of a proportional valve for adjusting fuel supply to a burner. The control is performed in minutes (for example, 100 minutes) between the minimum setting/input (fuel supply amount) and the maximum setting input.
Divide it and set the points to about 10 points)
Then, the amount of combustion air is controlled according to the input, so that the ratio of combustion air to fuel remains approximately constant.
（発明が解決しようとする課題）
ところで、従来の燃焼制御装置にあっては、ファンモー
タの回転数と比例弁の開度をある一定の割合で増加し減
少する関数（例えば、１秒間２／１００ステツプづづ増
加及び減少する関数）に乗せて制御しており、可変中が
大きくなると、バーナの大孔負荷等の関係もあり、全て
において燃焼用空気と燃料の比率が一定とならないが、
安定時は同等問題なく制御できる。しかし、ファンモー
夕の回転数と比例弁の開度を最少側に減少させる時にト
ラブルを起こす場合がある。すなわち、ファンモータ、
比例弁の多少のずれによる空気過剰気味の燃焼等のアン
バランスによりバーナの火炎の状態が不安定になり、吹
き消えや逆火等の異常燃焼が発生ずる場合がある。(Problems to be Solved by the Invention) By the way, in conventional combustion control devices, a function that increases and decreases the rotation speed of the fan motor and the opening degree of the proportional valve at a certain rate (for example, 2/2/second) is used. It is controlled using a function that increases and decreases in 100 steps, and as the variable becomes large, the ratio of combustion air and fuel is not constant in all cases due to the large hole load of the burner, etc.
When stable, it can be controlled without any problems. However, trouble may occur when reducing the rotation speed of the fan motor and the opening degree of the proportional valve to the minimum side. i.e. fan motor,
Unbalance, such as combustion with a slight excess of air due to a slight misalignment of the proportional valve, may cause the burner flame to become unstable, resulting in abnormal combustion such as blowout or backfire.
そこで、本発明は上記課題を解決すべくなされたもので
、ファンモータの回転数と比例弁の開度の減少時、吹き
消えや逆火等の異常燃焼が発生しにくい燃焼ｇｉ御装置
を提供することを目的とする。Therefore, the present invention was made to solve the above problems, and provides a combustion GI control device in which abnormal combustion such as blowout and backfire is less likely to occur when the rotation speed of the fan motor and the opening degree of the proportional valve decrease. The purpose is to
［発明の構成］
（課題を解決するための手段）
本発明は、上記目的を達成するために、燃焼用空気量の
調整用ファンモータの回転数とバーナへの燃料供給調整
用の比例弁の開度を一定の割合で増加し減少する関数に
乗せて空燃比を制御する燃焼制御装置において、バーナ
の火炎を検出する火炎検出素子を設けると共に、ファン
モータの回転数と比例弁の開度の減少時に火炎検出素子
からの検出値に応じて、ファンモータと比例弁との出力
の変化スピードを制御する回路を設けたものである。[Structure of the Invention] (Means for Solving the Problems) In order to achieve the above object, the present invention provides a proportional valve for adjusting the rotation speed of a fan motor for adjusting the amount of combustion air and the fuel supply to the burner. In a combustion control device that controls the air-fuel ratio using a function that increases and decreases the opening at a constant rate, a flame detection element is provided to detect the flame of the burner, and the rotation speed of the fan motor and the opening of the proportional valve are controlled. A circuit is provided to control the speed of change in the output of the fan motor and the proportional valve according to the detected value from the flame detection element when the flame is decreased.
（作用）
上記構成によれば、ファンモータの回転数と比例弁の開
度を一定の割合で減少させる時、回路によりバーナの火
炎に応じて、ファンモータと比例弁との出力の減少スピ
ードが緩やかになるために、ファンモータ、比例弁の多
少のずれによる空気過剰気味の燃焼等のアンバランスが
ほとんどなくなるので、バーナの火炎の状態がほぼ安定
になり、吹き消えや逆火等の異常燃焼が発生しにくくな
る。(Function) According to the above configuration, when the rotational speed of the fan motor and the opening degree of the proportional valve are decreased at a constant rate, the speed at which the output of the fan motor and the proportional valve decreases is controlled by the circuit according to the flame of the burner. Because the speed is gradual, unbalances such as excessive air combustion due to slight misalignment of the fan motor or proportional valve are almost eliminated, and the burner flame condition becomes almost stable, preventing abnormal combustion such as blowouts and backfires. is less likely to occur.
（実施例） 本発明の好適−実施例を添付図面に基づいて説明する。(Example) Preferred embodiments of the present invention will be described with reference to the accompanying drawings.
第１図において、１は室内ユニット２と室外ユニット３
とからなる燃焼制御装置である。In Fig. 1, 1 is an indoor unit 2 and an outdoor unit 3.
This is a combustion control device consisting of:
室内ユニット２内には、操作を行うための操作部４等に
接続された室内制御装置５が設けられている。上記室外
ユニット２内には、マイコンで形成された室外制御装置
６が設けられ、この室外制御装置６にはバーナ７の火炎
を検出する火炎検出素子としてのフレームロッド８がフ
レーム電流積出回＃Ｉ９を介して接続されている。また
、室外制御装置６は、上記操作部４からの指令を受ける
べく上記室内制御装置５に接続されている。さらに、室
外制御装置６は、バーナモータ制御回路１０及び比例弁
制御回路１１に接続されている。In the indoor unit 2, an indoor control device 5 is provided which is connected to an operating section 4 and the like for performing operations. In the outdoor unit 2, an outdoor control device 6 formed of a microcomputer is provided, and a flame rod 8 as a flame detection element for detecting the flame of the burner 7 is installed in the outdoor control device 6. Connected via I9. Furthermore, the outdoor control device 6 is connected to the indoor control device 5 to receive commands from the operating section 4 . Further, the outdoor control device 6 is connected to a burner motor control circuit 10 and a proportional valve control circuit 11.
そのバーナモータ制御回路１０は、燃焼用空気量のＦ１
整用ファンモータとしてのＤＣモータ１２に接続される
と共に、比例弁ｖＩａｌ ｒｇｉ路１１は、バーナ６へ
の供給燃料ガス圧力等を調整する比例弁１３に接続され
、室外制御装置６によりＤＣモータ１２の回転数と比例
弁１３の開度をある一定の割合で増加し減少する関数に
乗せて空燃比が制御されるようになっている。The burner motor control circuit 10 controls the combustion air amount F1.
The proportional valve vIal rgi path 11 is connected to a DC motor 12 as a maintenance fan motor, and is also connected to a proportional valve 13 that adjusts the pressure of fuel gas supplied to the burner 6. The air-fuel ratio is controlled by applying a function that increases and decreases the rotation speed of the proportional valve 13 and the opening degree of the proportional valve 13 at a certain constant rate.
ここで、第３図に示すように、最少ガス消費量と最大ガ
ス消費量との間でガス消費量をある一定の割合［例えば
、１秒間２／１００ステツプづづ］で減少及び増加させ
る場合についてみると、最大側ではフレーム電流は余り
変わらないが、最少側ではフレーム電流は燃焼特性によ
り最少側に連れて降下する。そこで、例えば比例弁１３
の出力の減少時、第２図に示すように、フレーム電流の
（ｄｔ／ｄＦｉ）の値の変化量が一定以上になった場合
、比例弁１３の出力の減少スピードを（ｄｔ＋ ／ ｄ
ｓ＋ ）から（ｄｔ、 ／ ｄＳ２ ）のように緩やか
にする。Here, as shown in Fig. 3, regarding the case where the gas consumption is decreased and increased at a certain rate [for example, 2/100 steps per second] between the minimum gas consumption amount and the maximum gas consumption amount. As you can see, the flame current does not change much on the maximum side, but on the minimum side, the flame current decreases as it approaches the minimum side due to the combustion characteristics. Therefore, for example, the proportional valve 13
As shown in Fig. 2, when the output of the proportional valve 13 decreases, if the amount of change in the value of (dt/dFi) of the flame current exceeds a certain level, the speed of decrease in the output of the proportional valve 13 is changed to (dt+/dFi).
s+) to (dt,/dS2).
上記フレーム電流検出回路９．室外制御装置６、バーナ
モータ制御回路１０及び比例弁部回路１１を含んでなる
全体の回路１４は、ＤＣモータ１２の回転数と比例弁１
３の開度を減少させる時、フレーム電流の変化率に応じ
てＤＣモータ１２、比例弁１３の出力の変化スピードが
緩やかに制御されるように構成されている。The frame current detection circuit 9. The entire circuit 14 including the outdoor control device 6, the burner motor control circuit 10, and the proportional valve circuit 11 is configured to control the rotation speed of the DC motor 12 and the proportional valve 1.
3, the speed of change in the output of the DC motor 12 and the proportional valve 13 is controlled to be gradual in accordance with the rate of change in the flame current.
次に本実施例の作用について説明する。Next, the operation of this embodiment will be explained.
空燃比制御におけるガス消費量を例えば最大から最少へ
と減少させる時、ガス消費量が比較的多い場合には、第
２図の左側に示すように、ＤＣモータ１２と比例弁１３
との２つの出力は、上述のマイコンによる制御に基づく
一定の割合で減少する関数に乗せて制御される。When reducing the gas consumption in air-fuel ratio control, for example from the maximum to the minimum, if the gas consumption is relatively large, the DC motor 12 and proportional valve 13 are activated as shown on the left side of FIG.
The two outputs are controlled by a function that decreases at a constant rate based on the control by the microcomputer described above.
次に、ガス消費量がある値Ｃまで低下した場合には、既
に述べたような不都合が生じる。しがし、この時、マイ
コンが監視しているフレーム電流の（ｄｔ／ｃＨｉ）の
値の変化量がソフト的に予め定められた設定値以上にな
る。ここで、マイコンは、ＤＣモータ１２と比例弁１３
との出力を次のように制御する。Next, when the gas consumption decreases to a certain value C, the above-mentioned disadvantages occur. However, at this time, the amount of change in the value of the frame current (dt/cHi) monitored by the microcomputer exceeds a preset value set in the software. Here, the microcomputer controls the DC motor 12 and the proportional valve 13.
Control the output as follows.
まず、バーナモータ制御回路１０に対しては、モータ１
２に対する給電電圧を下げる指令を発する。バーナモー
タ制御回路１０は、これを受けて、モータ１２に対する
給電電圧をそれまでより一定量だけ低い電圧に切り換え
、その結果ファンの回転数を減少させる。また、マイコ
ンは、上記と同時に、比例弁制御回路１１に対しては、
弁１３開度を減少させる指令を与える。これを受けて、
比例弁制御回Ｂ１１は、所定量だけその弁１３開度を小
さく又は開閉頻度を低く翻整する。これによって、ＤＣ
モータ１２の出力及び比例弁１３の出力の減少スピード
が（ｄｔ、 ／ ｄｓ、 ）から（ｄｔ２ ／ｄｓ２）
のように緩やかになり、ガス消費量を最少側へ減少させ
る時のＤＣモータ１２、比例弁１３の多少のずれによる
空気過剰気味の燃焼等のアンバランスがほとんどなくな
る。First, for the burner motor control circuit 10, the motor 1
Issues a command to lower the power supply voltage to 2. In response to this, the burner motor control circuit 10 switches the power supply voltage to the motor 12 to a voltage lower by a certain amount than before, thereby reducing the rotation speed of the fan. Further, at the same time as above, the microcomputer also performs the following for the proportional valve control circuit 11:
A command is given to reduce the opening degree of the valve 13. In response to this,
The proportional valve control circuit B11 reduces the opening degree of the valve 13 or lowers the opening/closing frequency by a predetermined amount. This allows DC
The decreasing speed of the output of the motor 12 and the output of the proportional valve 13 is from (dt, /ds, ) to (dt2 /ds2)
This becomes gradual, and imbalances such as combustion with a slight excess of air due to slight deviations of the DC motor 12 and proportional valve 13 when reducing the gas consumption to the minimum side are almost eliminated.
従って、バーナ７の火炎の状態がほぼ安定し、吹き消え
や逆火等の異常燃焼が発生しにくくなると共に、他の外
乱例えば風等に対しても強くなる。Therefore, the state of the flame of the burner 7 is almost stabilized, making it difficult for abnormal combustion such as blowout and flashback to occur, and making it resistant to other disturbances such as wind.
なお、本実施例においては、ガス燃料を例にとり説明し
たが、石油等の液体燃料に対しても上記構成を備えれば
上記とほぼ同様な効果が期待できることは勿論である。Although the present embodiment has been explained using gas fuel as an example, it goes without saying that substantially the same effects as described above can be expected for liquid fuel such as petroleum if the above configuration is provided.
また、火炎検出素子としてフレームロッドを用いたが、
サーモカッ１式の電圧検出素子を用いてもよく、この場
合でも上記フレーム電流の変化率に応じて電圧が変化す
る。In addition, a flame rod was used as the flame detection element, but
A thermocup type voltage detection element may be used, and even in this case, the voltage changes depending on the rate of change of the frame current.
［発明の効果］
以上要するに本発明によれば、ファンモータの回転数と
比例弁の開度の減少時、火炎検出素子からの検出値に応
じて、ファンモータと比例弁との出力の変化スピードを
緩やかに制御することで、吹き消えや逆火等の異常燃焼
が発生しにくくなるという優れた効果を発揮する。[Effects of the Invention] In summary, according to the present invention, when the number of rotations of the fan motor and the opening degree of the proportional valve decrease, the speed of change in the output of the fan motor and the proportional valve is adjusted according to the detected value from the flame detection element. By gently controlling the amount of fuel, it has the excellent effect of making it difficult for abnormal combustion such as blowout and flashback to occur.
第１図は本発明の一実施例を示す系統図、第２図は本発
明の時間に対するＤＣモータ及び比例弁の出力の関係を
示す図、第３図はガス消費量に対するＤＣモータ出力、
比例弁の出力、フレーム電流及び二酸化炭素の関係を示
す特性図である。
図中、７はバーナ、８は火炎検出素子、１２はファンモ
ータ、１３は比例弁、１４は回路である。FIG. 1 is a system diagram showing an embodiment of the present invention, FIG. 2 is a diagram showing the relationship between the output of the DC motor and the proportional valve with respect to time in the present invention, and FIG. 3 is a diagram showing the relationship between the output of the DC motor and the proportional valve with respect to the amount of gas consumed
It is a characteristic diagram showing the relationship between the output of a proportional valve, flame current, and carbon dioxide. In the figure, 7 is a burner, 8 is a flame detection element, 12 is a fan motor, 13 is a proportional valve, and 14 is a circuit.
Claims (1)
ナへの燃料供給調整用の比例弁の開度を一定の割合で増
加し減少する関数に乗せて空燃比を制御する燃焼制御装
置において、バーナの火炎を検出する火炎検出素子を設
けると共に、ファンモータの回転数と比例弁の開度の減
少時に火炎検出素子からの検出値に応じて、ファンモー
タと比例弁との出力の変化スピードを制御する回路を設
けたことを特徴とする燃焼制御装置。1. In a combustion control device that controls the air-fuel ratio by applying a function that increases and decreases the rotation speed of a fan motor for adjusting the amount of combustion air and the opening degree of a proportional valve for adjusting fuel supply to the burner at a constant rate. , a flame detection element is provided to detect the flame of the burner, and the change speed of the output of the fan motor and proportional valve is determined according to the detected value from the flame detection element when the rotation speed of the fan motor and the opening degree of the proportional valve decrease. A combustion control device characterized by having a circuit for controlling.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1293355A JPH03156209A (en) | 1989-11-10 | 1989-11-10 | Combustion control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1293355A JPH03156209A (en) | 1989-11-10 | 1989-11-10 | Combustion control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03156209A true JPH03156209A (en) | 1991-07-04 |
Family
ID=17793721
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1293355A Pending JPH03156209A (en) | 1989-11-10 | 1989-11-10 | Combustion control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03156209A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0774625A3 (en) * | 1995-11-20 | 1998-04-22 | Haitai Electronics Co., Ltd. | Combustion control circuit of combustion apparatus |
| US5971745A (en) * | 1995-11-13 | 1999-10-26 | Gas Research Institute | Flame ionization control apparatus and method |
| US6299433B1 (en) | 1999-11-05 | 2001-10-09 | Gas Research Institute | Burner control |
| US7241135B2 (en) | 2004-11-18 | 2007-07-10 | Honeywell International Inc. | Feedback control for modulating gas burner |
-
1989
- 1989-11-10 JP JP1293355A patent/JPH03156209A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5971745A (en) * | 1995-11-13 | 1999-10-26 | Gas Research Institute | Flame ionization control apparatus and method |
| EP0774625A3 (en) * | 1995-11-20 | 1998-04-22 | Haitai Electronics Co., Ltd. | Combustion control circuit of combustion apparatus |
| US6299433B1 (en) | 1999-11-05 | 2001-10-09 | Gas Research Institute | Burner control |
| US7241135B2 (en) | 2004-11-18 | 2007-07-10 | Honeywell International Inc. | Feedback control for modulating gas burner |
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