JPH0378531B2 - - Google Patents
Info
- Publication number
- JPH0378531B2 JPH0378531B2 JP61144047A JP14404786A JPH0378531B2 JP H0378531 B2 JPH0378531 B2 JP H0378531B2 JP 61144047 A JP61144047 A JP 61144047A JP 14404786 A JP14404786 A JP 14404786A JP H0378531 B2 JPH0378531 B2 JP H0378531B2
- Authority
- JP
- Japan
- Prior art keywords
- oxygen concentration
- flame
- ion current
- level
- detection
- 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.)
- Expired - Lifetime
Links
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 53
- 229910052760 oxygen Inorganic materials 0.000 claims description 53
- 239000001301 oxygen Substances 0.000 claims description 53
- 238000001514 detection method Methods 0.000 claims description 35
- 238000002485 combustion reaction Methods 0.000 claims description 33
- 230000007423 decrease Effects 0.000 claims description 31
- 230000027734 detection of oxygen Effects 0.000 claims 1
- 150000002500 ions Chemical class 0.000 description 27
- 238000010586 diagram Methods 0.000 description 11
- 230000007257 malfunction Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 229910002091 carbon monoxide Inorganic materials 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000000446 fuel Substances 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 238000009423 ventilation Methods 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
- F23N5/003—Systems for controlling combustion using detectors sensitive to combustion gas properties
- F23N5/006—Systems for controlling combustion using detectors sensitive to combustion gas properties the detector being sensitive to oxygen
-
- 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
Description
【発明の詳細な説明】
〔産業上の利用分野〕
この発明は、温風暖房機の不完全燃焼状態を検
出する酸素濃度検出装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to an oxygen concentration detection device for detecting an incomplete combustion state of a hot air heater.
石油またはガスを燃料とする温風暖房機は、燃
焼に必要な空気の酸素濃度が低下すると、不完全
燃焼をして一酸化炭素が発生する不具合が知られ
ている。
Hot-air heaters that use oil or gas as fuel are known to have a problem in which incomplete combustion occurs and carbon monoxide is generated when the oxygen concentration of the air necessary for combustion decreases.
そのため、従来より炎のイオン電流を利用して
酸素濃度の低下を検出する温風暖房機が考えられ
ている。 For this reason, hot air heaters have been considered that utilize the ion current of the flame to detect a decrease in oxygen concentration.
第５図はこの種温風暖房機の酸素濃度検出装置
の概略図であり、火炎１によつて炎のイオン電流
がフレームロツド２とバーナーヘツド３の間で流
れる。 FIG. 5 is a schematic diagram of an oxygen concentration detection device for this kind of hot air heater.
その炎のイオン電流値がマイクロコンピユータ
ー（以下マイコンという）４に入力され、マイコ
ン４の処理により酸素濃度の所定レベル低下時に
モータ５を停止させて燃焼を停止させるととも
に、警告ランプ６を点灯させるものである。 The ion current value of the flame is input to a microcomputer (hereinafter referred to as microcomputer) 4, and through processing by the microcomputer 4, when the oxygen concentration drops to a predetermined level, the motor 5 is stopped to stop combustion, and a warning lamp 6 is turned on. It is.
第６図は従来における温風暖房機を燃焼させた
時の燃焼時間と炎のイオン電流の値と酸素濃度の
検知レベルを示す図である。 FIG. 6 is a diagram showing the combustion time, the value of the ion current of the flame, and the detection level of oxygen concentration when a conventional warm air heater is used.
第７図は同じく従来の酸素濃度検出装置の動作
を示すフローチヤートである。 FIG. 7 is a flow chart showing the operation of the conventional oxygen concentration detection device.
第６図，第７図は参照して従来の検出動作を説
明する。 The conventional detection operation will be explained with reference to FIGS. 6 and 7.
温風暖房機が点火してからおよそ15分経過する
と、炎のイオン電流は安定した値となる。この時
に炎のイオン電流値を測定し、レベルＡからレベ
ルＢの範囲の酸素濃度低下の検出レベル値レベル
Ｃを決定する。 Approximately 15 minutes after the hot air heater is ignited, the ionic current of the flame reaches a stable value. At this time, the ion current value of the flame is measured, and a detection level level C of a decrease in oxygen concentration in the range from level A to level B is determined.
ここでは、レベルＡは酸素濃度低下の検出レベ
ル値の上限値で、酸素濃度20.9％時の炎のイオン
電流の値の80％程度に定め、レベルＢは酸素濃度
低下の検出レベル値の下限値で、酸素濃度が20.9
％時の炎のイオン電流値の25％程度に定め、検出
レベル値であるレベルＣは点火してから15分経過
時点での炎のイオン電流の約１／２の電流値でレ
ベルＡからレベルＢの制限をつけて検出レベルと
している。 Here, level A is the upper limit of the detection level value for a decrease in oxygen concentration, which is set at approximately 80% of the value of the flame ion current when the oxygen concentration is 20.9%, and level B is the lower limit value for the detection level value for a decrease in oxygen concentration. So, the oxygen concentration is 20.9
%, and the detection level value, Level C, is a current value that is approximately 1/2 of the flame ion current at the time of 15 minutes after ignition, and the level is changed from Level A to Level C. The limit B is set as the detection level.
酸素濃度低下の検出レベル値が設定されると、
その時点以降は常に酸素濃度低下の検出を行う。
長時間無換気の状態で使用すると、炎のイオン電
流値が次第に減少する。この炎のイオン電流が酸
素濃度低下の検出レベル値レベルＣを割るとマイ
コン４がこれを検知し、燃焼をストツプさせ、警
告ランプを点灯させる。 Once the detection level value for oxygen concentration decrease is set,
From that point onwards, detection of a decrease in oxygen concentration is always performed.
If used for a long time without ventilation, the ion current value of the flame will gradually decrease. When the ion current of this flame falls below the oxygen concentration detection level C, the microcomputer 4 detects this, stops combustion, and lights up a warning lamp.
第８図は温風暖房機の燃焼量の違いによる酸素
濃度と炎のイオン電流値の関係を示す図である。
FIG. 8 is a diagram showing the relationship between the oxygen concentration and the flame ion current value depending on the combustion amount of the warm air heater.
この図からも明らかなように、最小燃焼量の場
合、酸素濃度が通常（20.9％）の時には、炎のイ
オン電流が他の燃焼量の時と比して小さく、また
酸素濃度が低下しても炎のイオン電流の変化が少
ない。 As is clear from this figure, in the case of the minimum combustion amount, when the oxygen concentration is normal (20.9%), the ion current of the flame is smaller than at other combustion amounts, and the oxygen concentration decreases. There is also little change in the ionic current of the flame.
従つて、従来の方法で酸素濃度低下の検出を行
うと、例えば最小燃焼量の場合は、酸素濃度が所
定レベルに達しないうちに誤動作したり、あるい
は所定レベル低下時に動作しない等の問題点があ
つた。そのため、従来は最小燃焼量を所定の燃焼
量より小さくすることができなかつた。 Therefore, when detecting a decrease in oxygen concentration using the conventional method, for example, in the case of a minimum combustion amount, there are problems such as malfunctions before the oxygen concentration reaches a predetermined level, or failure to operate when a predetermined level decreases. It was hot. Therefore, conventionally it has not been possible to make the minimum combustion amount smaller than a predetermined combustion amount.
本発明は上記のような問題点を解消するために
なされたもので、、燃焼量が小さい時の酸素濃度
低下を、誤動作なく確実に検出できる温風暖房機
の酸素濃度検出装置を得ることを目的とする。 The present invention has been made to solve the above-mentioned problems, and aims to provide an oxygen concentration detection device for a hot air heater that can reliably detect a decrease in oxygen concentration when the combustion amount is small without malfunction. purpose.
この発明に係わる温風暖房機の酸素濃度検出装
置は、最小燃焼等の特定の燃焼量の場合の検出方
法を改善したもので、特定の燃焼量においては、
炎のイオン電流が所定レベルよりも大きいあるレ
ベルまで低下した時、燃焼量を自動的に変化さ
せ、炎のイオン電流を増加させて検出するように
したものである。
The oxygen concentration detection device for a hot-air heater according to the present invention is an improved detection method for a specific combustion amount such as minimum combustion.
When the ion current of the flame drops to a certain level greater than a predetermined level, the amount of combustion is automatically changed and the ion current of the flame is increased for detection.
この発明による検出装置は、最小燃焼量等の特
定の燃焼量時において、炎のイオン電流が所定レ
ベルより大きいあるレベルまで低下したとき、燃
焼量が増加するように制御されるため、イオン電
流の変化が大きくなり、酸素濃度の検出が雑音等
による誤動作がなく、確実に行われる。
The detection device according to the present invention is controlled so that when the ion current of the flame decreases to a certain level greater than a predetermined level at a specific combustion amount such as the minimum combustion amount, the combustion amount is increased. The change is large, and the oxygen concentration can be detected reliably without malfunctions due to noise or the like.
以下、この発明の一実施例について説明する。 An embodiment of the present invention will be described below.
第１図は、この発明による酸素濃度検出装置の
フローチヤートであり、第２図はこのときの酸素
濃度低下を検出する炎のイオン電流の検出レベル
値を示すもので、レベルＡは酸素濃度低下の検出
レベル値の上限値で、酸素濃度が20.9％時の炎の
イオン電流値の80％程度に定める。レベルＢは酸
素濃度低下の検出レベル値の下限値で、酸素濃度
が20.9％時の炎のイオン電流の値の25％程度に定
める。レベルＣ，Ｄは検出レベルであり、レベル
Ｃは点イの炎のイオン電流値によつて決定され、
例えば点イの炎のイオン電流の値の１／２程度と
する。また、準検出レベル値であるレベルＤは、
検出レベル値であるレベルＣよりも＋α大きい値
に設定されるものである。 Fig. 1 is a flowchart of the oxygen concentration detection device according to the present invention, and Fig. 2 shows the detection level value of the ion current of the flame that detects the decrease in oxygen concentration at this time. Level A is the decrease in oxygen concentration. The upper limit of the detection level value is set at approximately 80% of the flame ion current value when the oxygen concentration is 20.9%. Level B is the lower limit of the detection level for a decrease in oxygen concentration, and is set at approximately 25% of the flame ion current value when the oxygen concentration is 20.9%. Levels C and D are detection levels, and level C is determined by the ion current value of the flame at point A,
For example, it is set to about 1/2 of the value of the ion current of the flame at point A. In addition, level D, which is a quasi-detection level value, is
This is set to a value that is +α larger than level C, which is the detection level value.
第３図はこの発明の実施例において、炎のイオ
ン電流が酸素濃度通常時に比較的低い、例えば最
小燃焼量の場合の動作説明図である。 FIG. 3 is an explanatory diagram of the operation in the embodiment of the present invention when the ion current of the flame is relatively low when the oxygen concentration is normal, for example, at the minimum combustion amount.
次に、第１図と第３図を参照して動作を説明す
る。 Next, the operation will be explained with reference to FIGS. 1 and 3.
第３図の時間ロにおいて、炎のイオン電流の測
定を行い、酸素濃度の低下を検出する炎のイオン
電流の検出レベルＣ，Ｄを決定する。酸素濃度が
低下すると、炎のイオン電流が減少し、レベルＤ
に達すると、燃焼量を増し、炎のイオン電流が増
す。 At time B in FIG. 3, the ionic current of the flame is measured, and the detection levels C and D of the ionic current of the flame for detecting a decrease in oxygen concentration are determined. As the oxygen concentration decreases, the ionic current of the flame decreases, reaching level D.
When reaching , the amount of combustion increases and the ionic current of the flame increases.
そして酸素濃度が低下すると、炎のイオン電流
が低下し、レベルＣに達すると、燃焼を停止さ
せ、警告ランプを点灯させる。 When the oxygen concentration decreases, the ion current of the flame decreases, and when it reaches level C, combustion is stopped and a warning lamp is turned on.
燃焼量を変化させない状態を図中破線で示す。
この場合はレベルＣにはさほど酸素濃度が低下し
ないうちに達し、誤動作が発生しやすい。 The broken line in the figure shows the state where the combustion amount remains unchanged.
In this case, level C is reached before the oxygen concentration drops significantly, and malfunctions are likely to occur.
第４図は本実施例において、炎のイオン電流が
酸素濃度通常時に比較的高い場合の炎のイオン電
流と経過時間の関係を示したものである。この場
合は、酸素濃度が低下し、レベルＤに達すると燃
焼量を増すことにより、酸素濃度低下による炎の
イオン電流の変化が大きくなる。 FIG. 4 shows the relationship between the flame ion current and the elapsed time when the flame ion current is relatively high when the oxygen concentration is normal in this example. In this case, when the oxygen concentration decreases and reaches level D, the amount of combustion increases, thereby increasing the change in the ionic current of the flame due to the decrease in oxygen concentration.
従つて、酸素濃度がさらに低下すると、炎のイ
オン電流は、急激に低下し、レベルＣに達して燃
焼を停止し、警告ランプ８を点灯させる。 Therefore, when the oxygen concentration further decreases, the ionic current of the flame decreases rapidly, reaches level C, stops combustion, and lights up the warning lamp 8.
尚、炎のイオン電流は酸素濃度以外の要因にお
いても変化する。 Note that the ion current of the flame also changes due to factors other than oxygen concentration.
第９図は炎のイオン電流の低下の特性要因図で
ある。酸素濃度が減少した場合においても、ま
た、雑音等の他の要因によつても炎のイオン電流
は低下するが、一度消火を経れば、酸素濃度は回
復するし、雑音等の他の要因による誤動作を解消
するために、再燃焼時は変化させる前の燃焼量で
運転する。 FIG. 9 is a characteristic factor diagram of the decrease in flame ion current. The ion current of the flame decreases even when the oxygen concentration decreases, and also due to other factors such as noise, but once the fire is extinguished, the oxygen concentration recovers and decreases due to other factors such as noise. In order to eliminate malfunction caused by this, during reburning, the engine is operated at the combustion amount before the change.
以上のように、この発明によれば、最小燃焼量
での運転時のような特定の燃焼量においても、雑
音等による酸素濃度低下の誤動作が少なくなり、
精度の高い酸素濃度検出ができる。
As described above, according to the present invention, even at a specific combustion amount such as during operation at the minimum combustion amount, malfunctions due to oxygen concentration reduction due to noise etc. are reduced.
Highly accurate oxygen concentration detection is possible.
第１図はこの発明の一実施例を示すフローチヤ
ート、第２図は同じく酸素濃度低下を検出する炎
のイオン電流のレベル値決定を示す図、第３図，
第４図はこの発明の実施例の動作説明図、第５図
はこの種温風暖房機の一般的な酸素濃度検出装置
の概略図、第６図は密閉された部屋で温風暖房機
を運転したときの燃焼時間と炎のイオン電流値と
酸素濃度低下の検知レベルを示す図、第７図は従
来の酸素濃度検出装置のフローチヤート、第８図
は燃焼量の違いによる酸素濃度と炎のイオン電流
の関係図、第９図は炎のイオン電流の変化の特性
要因図である。
図中、１は炎、２はフレームロツド、３はバー
ナーヘツド、４はマイクロコンピユーター、５は
モータ、６は警告ランプである。
FIG. 1 is a flowchart showing an embodiment of the present invention, FIG. 2 is a diagram showing determination of the level value of flame ion current for detecting a decrease in oxygen concentration, and FIG.
Fig. 4 is an explanatory diagram of the operation of the embodiment of the present invention, Fig. 5 is a schematic diagram of a general oxygen concentration detection device for this kind of hot air heater, and Fig. 6 is a diagram showing the operation of the hot air heater in a closed room. A diagram showing the combustion time, flame ion current value, and detection level of oxygen concentration drop during operation, Figure 7 is a flowchart of a conventional oxygen concentration detection device, and Figure 8 shows the oxygen concentration and flame due to differences in combustion amount. FIG. 9 is a diagram showing the characteristics and causes of changes in the ionic current of the flame. In the figure, 1 is a flame, 2 is a flame rod, 3 is a burner head, 4 is a microcomputer, 5 is a motor, and 6 is a warning lamp.
Claims (1)
化することを利用して、室内の酸素濃度を検出す
る温風暖房機の酸素濃度検出装置において、特定
の燃焼量における酸素濃度の検出を、炎のイオン
電流が低下して所定の検出レベル値よりも大きい
あらかじめ設定された準検出レベル値まで低下し
たとき、燃焼量を増加方向に変化させ、その変化
後の炎のイオン電流が前記所定の検出レベル値に
達したことを検出して不完全燃焼状態の検出を行
うことを特徴とする温風暖房機の酸素濃度検出装
置。1 In an oxygen concentration detection device for a warm air heater that detects indoor oxygen concentration by utilizing the fact that the ion current of the flame changes depending on the oxygen concentration in the air, the detection of oxygen concentration at a specific combustion amount is When the ion current of the flame decreases to a preset quasi-detection level value that is larger than the predetermined detection level value, the combustion amount is changed in an increasing direction, and the ion current of the flame after that change is set to the predetermined detection level value. An oxygen concentration detection device for a hot-air heater, characterized in that an incomplete combustion state is detected by detecting that a level value has been reached.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14404786A JPS62299616A (en) | 1986-06-20 | 1986-06-20 | Oxygen concentration detecting device for fan heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP14404786A JPS62299616A (en) | 1986-06-20 | 1986-06-20 | Oxygen concentration detecting device for fan heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS62299616A JPS62299616A (en) | 1987-12-26 |
| JPH0378531B2 true JPH0378531B2 (en) | 1991-12-16 |
Family
ID=15353084
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP14404786A Granted JPS62299616A (en) | 1986-06-20 | 1986-06-20 | Oxygen concentration detecting device for fan heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS62299616A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012067984A (en) * | 2010-09-27 | 2012-04-05 | Corona Corp | Combustion apparatus |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0796925B2 (en) * | 1988-04-13 | 1995-10-18 | 松下電器産業株式会社 | Combustion detector |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6190051A (en) * | 1984-10-11 | 1986-05-08 | Mitsubishi Electric Corp | Oxygen concentration detector for combustion machine |
-
1986
- 1986-06-20 JP JP14404786A patent/JPS62299616A/en active Granted
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6190051A (en) * | 1984-10-11 | 1986-05-08 | Mitsubishi Electric Corp | Oxygen concentration detector for combustion machine |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012067984A (en) * | 2010-09-27 | 2012-04-05 | Corona Corp | Combustion apparatus |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS62299616A (en) | 1987-12-26 |
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