JPS5997422A - Gas combustion control device - Google Patents
Gas combustion control deviceInfo
- Publication number
- JPS5997422A JPS5997422A JP57207906A JP20790682A JPS5997422A JP S5997422 A JPS5997422 A JP S5997422A JP 57207906 A JP57207906 A JP 57207906A JP 20790682 A JP20790682 A JP 20790682A JP S5997422 A JPS5997422 A JP S5997422A
- Authority
- JP
- Japan
- Prior art keywords
- air
- gas
- differential pressure
- output
- temperature
- 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
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
- F23N1/08—Regulating fuel supply conjointly with another medium, e.g. boiler water
- F23N1/10—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught
- F23N1/102—Regulating fuel supply conjointly with another medium, e.g. boiler water and with air supply or draught 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
- F23N2225/00—Measuring
- F23N2225/02—Measuring filling height in burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/08—Measuring temperature
- F23N2225/18—Measuring temperature feedwater temperature
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/02—Air or combustion gas valves or dampers
- F23N2235/06—Air or combustion gas valves or dampers at the air intake
-
- 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
-
- 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
- F23N2235/18—Groups of two or more valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/18—Systems for controlling combustion using detectors sensitive to rate of flow of air or fuel
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、負荷に応じて燃焼出力を連続可変するととも
に、燃焼用空気量（以下単に空気量という）とガス量の
比（以下空燃比という）をほぼ一定に保ち、燃焼の安定
性と高効率を実現するための特に家庭用燃焼機器に用い
られるガス燃焼制御装置に関するものである。[Detailed Description of the Invention] Industrial Application Field The present invention continuously varies the combustion output according to the load, and the ratio of the combustion air amount (hereinafter simply referred to as the air amount) to the gas amount (hereinafter referred to as the air-fuel ratio). The present invention relates to a gas combustion control device used particularly in household combustion equipment to maintain combustion stability and high efficiency by keeping the temperature approximately constant.
従来例の構成とその問題点
従来のこの種のガス燃焼制御装置として、あ１図に示す
均圧弁方式（あるいはゼロガバナ方式）がよく知られて
いる。すなわち送風機１によシ送られた空気は空気絞９
２を経て混合部３へ、ガスは゛均圧弁４、ガス絞シロを
経て混合部３へ入り空気とガスとが混合され、バーナ６
へ導ひかれて燃焼する。 ・
均圧弁４の背圧室７には空気絞り２の上流の圧力が導ひ
かれており、均圧弁４は均圧弁出口の圧力を背圧室７の
圧力と等しくなる様に自動調節する。Conventional Structure and Problems The pressure equalizing valve system (or zero governor system) shown in Figure A1 is well known as a conventional gas combustion control device of this type. In other words, the air sent by the blower 1 is passed through the air constriction 9.
2, the gas enters the mixing section 3 through the pressure equalization valve 4 and the gas throttle, where the air and gas are mixed, and the gas is transferred to the burner 6.
It is drawn to and burns. - The pressure upstream of the air throttle 2 is introduced into the back pressure chamber 7 of the pressure equalization valve 4, and the pressure equalization valve 4 automatically adjusts the pressure at the outlet of the pressure equalization valve to be equal to the pressure in the back pressure chamber 7.
ここで空気絞りの上流の圧力をＰＡ、空気量全ＱＡ、ガ
ス絞りの上流の圧カ全Ｐ。、ガス量をＱＧ、混合部の圧
力ヲＰＭとすると、空燃比ＱＡ／ＱＧはの関係がある。Here, the pressure upstream of the air restriction is PA, the total air amount QA, and the total pressure upstream of the gas restriction P. , the gas amount is QG, and the pressure of the mixing section is PM, then the air-fuel ratio QA/QG has the following relationship.
均圧弁４が理想的にＰＧ＝ＰＡに調節できればとなシ、
ＱＡを変化させても空燃比は常に一定となるはずである
。しかし、均圧弁４はダイアフラム８でＰＡとＰＧとの
差圧を受けて弁９を機械的に動かすものであるから、ダ
イアフラムの剛性、変位に伴なうダイアフラムの有効面
積の変化、弁９が受ける均圧弁入口圧力の影響等にょシ
、必ず圧力調節誤差ΔＰＧを生じる。すなわちＰＧ＝Ｐ
Ａ＋ΔＰＧであるので、
となり、圧力調節誤差にょる空燃比の変動はＰＡ−ＰＭ
の値が小さくなるほど大きくなる。If the pressure equalizing valve 4 can ideally adjust PG=PA,
Even if QA is changed, the air-fuel ratio should always remain constant. However, since the pressure equalizing valve 4 mechanically moves the valve 9 in response to the differential pressure between PA and PG at the diaphragm 8, the change in the effective area of the diaphragm due to the rigidity of the diaphragm and displacement, Due to the influence of the received pressure equalizing valve inlet pressure, etc., a pressure adjustment error ΔPG will always occur. That is, PG=P
Since A + ΔPG, it becomes , and the fluctuation of air-fuel ratio due to pressure adjustment error is PA - PM
The smaller the value of , the larger it becomes.
したがって、空燃比誤差を一定の範囲内に保ちながら燃
焼出力の調節比を大きくとろうとすれば、ＰＡ−ＰＭの
値を大きくするか、ΔＰＧを小さくしは暖房用の用途で
は燃焼出方の調節比が′／１５ないし ／１０程度必要
である。そのためにＰＡ−ＰＭを大きくすると送風機が
きわめて大きくなるだけでなく、供給圧の低い都市ガス
等ではＰＡがガス供給圧よシ高くな９実現不可能である
。また、都市ガス以外のガスで実現したとしても、ガス
圧が低下した場合には空燃比制御精度が著しく悪化して
良好な燃焼状態が得られなくなるという問題があった。Therefore, if you want to increase the control ratio of combustion output while keeping the air-fuel ratio error within a certain range, you must increase the value of PA-PM or decrease ΔPG and adjust the combustion output in heating applications. The ratio must be between '/15 and /10. For this reason, increasing PA-PM not only makes the blower extremely large, but also makes it impossible to realize that PA is higher than the gas supply pressure in the case of city gas, etc., where the supply pressure is low. Further, even if the method is realized using a gas other than city gas, there is a problem in that when the gas pressure decreases, the accuracy of air-fuel ratio control deteriorates significantly, making it impossible to obtain a good combustion state.
更にまたΔＰＧ を小さくするにも均圧弁の大きさか
ら限度があシ、経時変化の影響、調整の困難さがあるな
ど、家庭用燃焼機器への適用は難しかった。Furthermore, there are limits to reducing ΔPG due to the size of the pressure equalizing valve, the effects of aging, and difficulty in adjustment, making it difficult to apply to household combustion equipment.
発明の目的
本発明は上記従来の問題を解消するもので、送風機や弁
装置を大型化することなく、燃焼出力の調節比が大きく
、かつ空燃比安定性に優れたガス燃焼制御装置を提供す
ることを目的とするものである。Purpose of the Invention The present invention solves the above-mentioned conventional problems, and provides a gas combustion control device that has a large combustion output adjustment ratio and excellent air-fuel ratio stability without increasing the size of the blower or valve device. The purpose is to
発明の構成
この目的を達成するために本発明は、空気側通路とガス
側通路にそれぞれの流量に応じた圧力損失を生じさせる
空気絞りとガス絞りｋ設け、その下流側を合流して共通
圧力にするとともに、前記二つの絞シ上流側の圧力を、
圧力差に応じて電気信号を発生する差圧センサに導ひく
とともに被加熱体の温度を検出する温度検出器と、温度
設定器と、前記温度検出器の信号と前記温度設定器の信
号との差を増幅演算する温度調節回路と、前記差圧セン
サの出力の絶対値が一定値以上のとき出力を発生する差
圧比較器を有し、前記温度調節回路の出力で前記空気絞
り上流に設けられた空気量調節手段を制御し、かつ前記
差圧センサの出力に応じてガス絞り上流に設けられたガ
ス量調節手段を制御するとともに、前記差圧比較器の出
力が発生した時は、前記温度調節回路に優先して差圧セ
ンサの信号に応じた前記空気量調節手段を制御するよう
に構成したものである。Structure of the Invention In order to achieve this object, the present invention provides an air constriction and a gas constriction k that produce pressure loss in accordance with the respective flow rates in the air side passage and the gas side passage, and merges the downstream sides thereof to create a common pressure. At the same time, the pressure on the upstream side of the two throttles is
a temperature detector that is guided to a differential pressure sensor that generates an electrical signal in response to a pressure difference and detects the temperature of the heated object; a temperature setting device; and a signal of the temperature sensor and a signal of the temperature setting device. A temperature control circuit that amplifies and calculates the difference, and a differential pressure comparator that generates an output when the absolute value of the output of the differential pressure sensor is equal to or higher than a certain value, and is provided upstream of the air throttle with the output of the temperature control circuit. and controls the gas amount adjusting means provided upstream of the gas throttle according to the output of the differential pressure sensor, and when the output of the differential pressure comparator is generated, The air amount adjusting means is configured to be controlled in accordance with the signal from the differential pressure sensor with priority over the temperature adjusting circuit.
この構成によって、空気側、ガス側二つの絞シ上流側の
差圧を検出する差圧センサを備え、この差圧センサ出力
に応じて空燃比が一定になるようにガス量をガス量調節
手段によって制御し、差圧センサの出力が空気量に対応
した比較基準値よシも大きくなった場合には、温度調節
回路に優先して、空気量を空気量調節手段で制御するこ
とでガス圧が低下した場合でも、空燃比を補正制御する
ので、常に安定した燃焼状態を可能にする。With this configuration, it is equipped with a differential pressure sensor that detects the differential pressure upstream of the two restrictors on the air side and the gas side, and the gas amount adjusting means adjusts the gas amount so that the air-fuel ratio is constant according to the output of this differential pressure sensor. If the output of the differential pressure sensor becomes larger than the comparison reference value corresponding to the air amount, the air amount is controlled by the air amount adjusting means, giving priority to the temperature control circuit, and the gas pressure is increased. Even if the air-fuel ratio decreases, the air-fuel ratio is corrected and controlled, making it possible to maintain a stable combustion condition at all times.
実施例の説明
以下、本発明の一実施例を第２図〜第４図の図面を用い
て説明する。なお、第２図中、第１図と同一部品につい
ては同一番号を付している。DESCRIPTION OF THE EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS. 2 to 4. In FIG. 2, parts that are the same as those in FIG. 1 are given the same numbers.
第２図において、４は差圧センサ、７Ｇはガス圧力比例
制御弁等のガス量調節手段（以下７Ｇヲガス圧力比例制
御弁と呼ぶ）、７Ａはダンパ等の空気量調節手段、８は
熱交換器、９は出湯管、１０は出湯管上に設置されてい
るサーミスタ等の温度検出器であシ、１１及び１２はそ
れぞれガス側通路及び空気側通路である。そして、電気
制御系として、温度検出器１ｏの信号に応じて１の送風
機を制御する為に、１３の温度検出回路、１４の温度設
定器、１５の温度調節回路、１６の空気量調節手段回路
から構成すると共に、４の差圧センサの出力に応じて７
Ｇのガス圧力比例制御弁を制御する為に１７の差圧セン
サ検出回路、１８の空燃比調節回路で構成し、更に１．
ガス圧が低下した場合に空燃比が許容範囲を越えないよ
うに制御する為の手段として、差圧比較器１９で構成し
ている。In Fig. 2, 4 is a differential pressure sensor, 7G is a gas amount adjusting means such as a gas pressure proportional control valve (hereinafter referred to as 7G gas pressure proportional control valve), 7A is an air amount adjusting means such as a damper, and 8 is a heat exchanger. 9 is a hot water outlet pipe, 10 is a temperature detector such as a thermistor installed on the hot water outlet pipe, and 11 and 12 are a gas side passage and an air side passage, respectively. As an electrical control system, 13 temperature detection circuits, 14 temperature setting devices, 15 temperature adjustment circuits, and 16 air volume adjustment means circuits are used to control the 1 blower according to the signal from the temperature detector 1o. 7 according to the output of the 4 differential pressure sensors.
In order to control the gas pressure proportional control valve G, it is composed of 17 differential pressure sensor detection circuits, 18 air-fuel ratio adjustment circuits, and 1.
A differential pressure comparator 19 is used as a means for controlling the air-fuel ratio so that it does not exceed a permissible range when the gas pressure decreases.
第３図のイに於いて、五Ｂ’ＢＣの直線は異常なガス圧
低下のない場合の空気過剰率（ｍとする）一定（本−実
施例の場合にはｍ＝１．２）の空燃比制御特性を示して
いる。In Fig. 3 A, the straight line of 5B'BC shows the constant air excess ratio (m) (m=1.2 in this example) when there is no abnormal gas pressure drop. It shows the air-fuel ratio control characteristics.
ＢＤＩＣの直線、及びＢ’ Ｄ′に’の直線は異常なガ
ス圧低下が発生した場合に空気量がＡ１からム２へある
いはＡ′１からＡ′２へ増加しても、ガス量が、ＧＬあ
るいはＧ′ＬＪニジ増加しない状態を示している。The straight line of BDIC and the straight line of B' and D' indicate that even if the air volume increases from A1 to M2 or from A'1 to A'2 when an abnormal gas pressure drop occurs, the gas volume will not change. This shows a state in which GL or G'LJ does not increase.
そして、ＯＤ’ Ｄを結ぶ直線は、空気過剰率ｍが１−
１：１．２よシ大きく（本−実施例ではｍ＝１．（３）
かつ、バーナの燃焼特性等から決定される安定燃焼域限
界付近にある空燃比制御特性を示す。逆に。Then, the straight line connecting OD' D has an excess air ratio m of 1-
1: larger than 1.2 (m=1.(3) in this example)
In addition, it shows air-fuel ratio control characteristics near the limit of the stable combustion range determined from the combustion characteristics of the burner. vice versa.
Ｄ点及びＶ点は、燃焼出力が変化した場合でも、空燃比
が等しい点を示している。Point D and point V indicate points where the air-fuel ratio is the same even when the combustion output changes.
また、第３図の口及びハはこのような場合に、空気量に
対応して発生する差圧比較器の出力及び差圧センサの出
力の状況を示している。Further, in such a case, the output of the differential pressure comparator and the output of the differential pressure sensor are shown in FIG.
第４図は、本発明の一実施例としてガス給湯機器に応用
した場合に於ける給湯能力特性図を示している。FIG. 4 shows a hot water supply capacity characteristic diagram when the present invention is applied to a gas hot water supply device as an embodiment of the present invention.
上記構成に於いてすでに、ノ（−す６には点火され、そ
して出湯管９から流れでる出湯量が第４図におけるＷＭ
ＩＮである時に丁度第３図に於けるイのＡ点で制御され
ているものとする。（すなわち、この状態は、燃焼可変
範囲の最小の状態であって空気量はＡＭＩＮ ’ガス量
はＧＭＩＮに制御されている）このような状態から温度
設定器１４ ’ｋ ＴＭＡ！そのままにしておいて、出
湯量を増加させていくと出湯温度が一時降下するように
作用するので、１３の温度検出回路と１４の温度設定器
との間に温度偏差信号ΔＴが発生する。そして、この温
度偏差信号ΔＴは１５の温度調節回路、１６の空気量調
節手段回路で処理されて、１の送風機からの空気量を増
大させるように制御する。空気量力玉亥１ｊ々変化する
このような状態では、４の差圧センサに、差圧が発生す
るので、この差圧を差圧センサ検出回路１７及び、空燃
比調節回路１８で電気的に処理して、差圧センサ４に作
用している差圧カニ零になるように７０のガス圧力比例
制御弁力）らの流量を増加させるように制御する。In the above configuration, the nozzle 6 is already ignited, and the amount of hot water flowing out from the hot water tap 9 is equal to WM in FIG.
Assume that the control is exactly at point A in FIG. 3 when it is IN. (In other words, this state is the minimum state of the combustion variable range, and the air amount is controlled to AMIN' and the gas amount is controlled to GMIN.) From this state, the temperature setting device 14'k TMA! If the amount of hot water left as it is is increased, the temperature of hot water temporarily drops, so a temperature deviation signal ΔT is generated between the temperature detection circuit 13 and the temperature setting device 14. This temperature deviation signal ΔT is processed by a 15 temperature control circuit and a 16 air volume control means circuit to control the air volume from the 1 blower to be increased. In such a state where the air quantity and force are constantly changing, a differential pressure is generated in the differential pressure sensor 4, so this differential pressure is electrically processed by the differential pressure sensor detection circuit 17 and the air-fuel ratio adjustment circuit 18. Then, the flow rate of the gas pressure proportional control valve 70 is increased so that the differential pressure acting on the differential pressure sensor 4 becomes zero.
この時、第３図イに於いて空燃比一定のＩ１１御すなわ
ちＡからＣ方向にむかうはソ直線に沿ったｆｆｔｌ制御
になる。At this time, in FIG. 3A, I11 control with a constant air-fuel ratio, that is, fftl control along the straight line from A to C direction is performed.
また、第４図に於いては、ｅからｅ′にむ力λう線上で
、出湯温度がは’： ＴＭＡｘ一定に制御されている。Further, in FIG. 4, the outlet temperature is controlled to be constant TMAXx on the force λ deflection line from e to e'.
さらにまた、湯量を机ム、になるように絞りさらに温度
設定器１４をＴＭＩＮ Ｋなるように設定すると、第４
図のｆの状態を維持する。そして、この状態から出湯量
を徐々に”ＭＡＸ迄増力口させると前記ｅからｅ′に制
御された場合と同じように、出湯温度がＴＭＩＮをはｙ
維持しつ＼、ｆｄ・らｆ′の状態まで制御される。Furthermore, if the amount of hot water is reduced to TMIN K, and the temperature setting device 14 is set to TMIN K, the fourth
Maintain the state f in the figure. Then, when the hot water output amount is gradually increased from this state to MAX, the hot water temperature will rise below TMIN, just as in the case where the control was from e to e'.
is maintained and controlled to the state of fd.f'.
この状態を第３図イにもとづいて説明するとＡＣｉの線
上に沿って、最大定格値Ｃの状態、すなわち空気量がＡ
ＭＡＸガス量がＧＭＡＸの状態まで空燃比一定で制御さ
れることになる。To explain this state based on Fig. 3A, the maximum rated value C is reached along the line ACi, that is, the air amount is A.
The air-fuel ratio is controlled to be constant until the MAX gas amount reaches the GMAX state.
逆にｅ′やｆ’−またはその中間の状態から出湯 景
−を減少させたシ、最低制御温度”ＭＩＮ以上の
状態から１４の温度設定器で設定温度を低くした場合に
は逆に、送風機１は空気量を減少するように制御され、
第２図におけるＰＡの圧力が低下する方向に作用するの
で差圧センサ４に差圧が発生する。On the other hand, from e', f'- or an intermediate state,
Conversely, when the set temperature is lowered using the temperature setting device 14 from a state where the minimum control temperature "MIN" is lowered, the blower 1 is controlled to reduce the amount of air;
Since the pressure of PA in FIG. 2 acts in a decreasing direction, a differential pressure is generated in the differential pressure sensor 4.
したがって、この差圧が零になるように７のガス圧力比
例制御弁はガス量を減少するように自動制御される。Therefore, the gas pressure proportional control valve 7 is automatically controlled to reduce the gas amount so that this differential pressure becomes zero.
以上がガス圧低下のない正常な制御状態に於ける作用の
説明である。周知の如く家庭用のガス燃焼機器に使われ
ているガス種は、都市ガス、天然ガス、プロパンガス等
で代表さ九る。これらのいづれのガスも供給ガス圧が規
定されており、例えばｔ都市ガスの場合には、標準ガス
圧１００．ＨＯ２
最低ガス圧５０ｆｉＨ２０最高ガス圧２００ ｒｒｒｍ
Ｒ２０と規定されている。The above is an explanation of the operation in a normal control state where there is no drop in gas pressure. As is well known, the types of gases used in household gas combustion appliances include city gas, natural gas, propane gas, etc. The supply gas pressure for each of these gases is specified; for example, in the case of t city gas, the standard gas pressure is 100. HO2 Minimum gas pressure 50fiH20 Maximum gas pressure 200rrrm
It is specified as R20.
燃焼機器の設計は最低ガス圧の時でも燃焼機器として規
定されている燃焼特性、給湯能力等が十分満足されるよ
うに配慮されていることは勿論である。It goes without saying that the combustion equipment is designed so that the combustion characteristics, hot water supply capacity, etc. specified for the combustion equipment are fully satisfied even at the lowest gas pressure.
ところが、今第３図に於けるＡＢ綾線上中間の出力を増
加させようとすると、空気量ＱＡＦｉ、Ａ、。However, if we try to increase the output in the middle of the AB twill line in FIG. 3, the air amount QAFi,A.
Ａ２．Ａ３と増加するがガス量はＢ点に於けるＧＬよシ
増加しないので空燃比制御特性は、ＡＢＣ線上に沿わな
いでＢ点から折り曲がシ、ＡＢＤＥのように制御される
ことになる。つまり、ガス量が不足して空燃比が増加す
るようになる。A2. Although the gas amount increases to A3, the gas amount does not increase as much as GL at point B, so the air-fuel ratio control characteristic is controlled not along line ABC but from point B to ABDE. In other words, the amount of gas becomes insufficient and the air-fuel ratio increases.
−万、このような状態にあるとき、燃焼出力を可変させ
ると、ＡＢ、ＩＪ上では所定の空燃比で制御されている
ので差圧センサ４の出力は零になるように制御されるの
で、ａ１〜ａ２の線に沿い、又差圧比較器１９からの出
方はｂ１〜ｂ２の線に沿って（すなわち見かけ上出力零
の状態〕制御される。- In such a situation, if the combustion output is varied, the output of the differential pressure sensor 4 will be controlled to be zero since AB and IJ are controlled at a predetermined air-fuel ratio. The output from the differential pressure comparator 19 is controlled along the line a1 to a2, and along the line b1 to b2 (that is, an apparent state of zero output).
そして、ガス圧が低下している制御域Ｂ−Ｄに入いると
、差圧センサ４からａ２〜ａ３線上に沿う出力が光生じ
、黄にＤ点から空気量が増加すると、ａ３〜８４線上に
沿う出力が発生する。このときＤＥＯ線に沿って更に空
燃比が増加する方向に変ろうとするが、一方、Ｄ点を越
えて、すなわち空気量が、Ａ２から増加しようとすると
、差圧センサ４の出力が空気量Ａ２によって足首る比較
基準値ａ６の点を越えるので、差圧比較器１９からｂ６
〜ｂ４線上に沿った出力が発生する。このような場合に
は圧力センサ４の出力または差圧比較器１９の出力によ
り温度調節回路１５に優先して送風機１０回転数を減少
させるように、すなわちＥ点からＤ点へひき戻すように
制御するものである。When the gas pressure enters the control range B-D where it is decreasing, the differential pressure sensor 4 generates an output along the lines a2 to a3, and when the air amount increases from point D to yellow, it is on the lines a3 to 84. Output along the lines will be generated. At this time, the air-fuel ratio tries to further increase along the DEO line, but on the other hand, when it exceeds point D, that is, when the air amount tries to increase from A2, the output of the differential pressure sensor 4 changes to the air amount A2. Since the point of comparison reference value a6 is exceeded, the differential pressure comparator 19 to b6
An output along the line ~b4 is generated. In such a case, the output of the pressure sensor 4 or the output of the differential pressure comparator 19 is used to control the temperature control circuit 15 so as to reduce the number of revolutions of the blower 10, that is, to return it from point E to point D. It is something to do.
また、上記の場合よりも低燃焼域で、ガス圧が低下して
し甘い、第３図イのＧ′１．よシガス量が増大しない場
合には、同様にして、その空燃比制御特性は、Ｂ′点か
ら哲り曲がり、Ａ Ｂ′Ｄ’ Ｅ’のように制御されよ
うとするが、この場合にもＥ′点が許容空燃比の限界値
ｍ＝１６よりも増大する方向にあるので空気量Ａ；に対
応した比較基準値ａ′６点を越えると同様にして圧力セ
ンサ４の出力または差圧比較器１９の出力により、温度
調節回路１６に優先して、Ｅ′点からＤ′点へすなわち
ｍ＝１．６になるように制御されるものである。Furthermore, G'1 in Fig. 3A, where the gas pressure decreases more easily in the low combustion range than in the case described above. Similarly, if the amount of exhaust gas does not increase, the air-fuel ratio control characteristic curves from point B' and attempts to be controlled as A B'D'E', but in this case also. Since point E' is in the direction of increasing more than the limit value m = 16 of the allowable air-fuel ratio, when the comparison reference value a' corresponding to the air amount A exceeds the point 6, the output of the pressure sensor 4 or the differential pressure is compared in the same way. The temperature control circuit 19 gives priority to the output of the temperature control circuit 16 and controls the temperature from point E' to point D', that is, m=1.6.
ガス圧が異常に低下する場合として、供給圧そのものが
低下する以外に次のものがある。すなわち燃焼機器の排
気系路の圧力が強風等の為に上昇すると、ガス量が減少
するので、供給ガス圧が低下した場合と同じになる。In addition to a drop in the supply pressure itself, cases where the gas pressure drops abnormally include the following: That is, if the pressure in the exhaust system of the combustion equipment increases due to strong winds or the like, the amount of gas decreases, which is the same as when the supply gas pressure decreases.
このように、ガス燃焼機器の力で供給圧が低下した場合
に、差圧センサ４の出力が空気量によって定まる比較基
準値を越えると、差圧比較器１９の出力により空気量を
減少させるような出力を送風機１に与えることで燃焼可
変範囲全域にわたって許容空燃比の上限値すなわちｍ＝
＝１．６ｉ越えることがないような制御が可能になる。In this way, when the supply pressure is reduced by the force of the gas combustion equipment and the output of the differential pressure sensor 4 exceeds the comparison reference value determined by the air amount, the output of the differential pressure comparator 19 is used to reduce the air amount. The upper limit of the allowable air-fuel ratio, that is, m =
= 1.6i is not exceeded.
したがって−酸化炭素が許容限界値以上発生したり、異
常燃焼音が発生したりあるいは燃焼炎が吹消えしたシす
ることがなくなる。Therefore, there is no possibility that carbon oxides will be generated in excess of the permissible limit, that abnormal combustion noises will be generated, or that the combustion flame will not blow out.
発明の効果
以上のように、本発明のガス燃焼制御装置によれば、次
の効果が得られるものである。Effects of the Invention As described above, the gas combustion control device of the present invention provides the following effects.
空気側及びガス側の両通路に空気絞り及びガス絞りを設
け、その下流側を合流して共通圧力にするとともに、前
記二つの絞シ上流側の圧力を差圧センサで検出し、燃焼
出力に対応して発生する差圧センサの出力で、空燃比が
一定になるように制御するので、従来のような機械式の
均圧弁制御に比較して圧力調節誤差が小さくなシ燃焼制
御精度が向上するはかりでなく、差圧センサの差圧を小
さくして制御することが出来るので、送風機等が小型化
され、かつ都市ガス等の供給ガス圧が低い場合の家庭用
燃焼機器への適用を可能にするものである。An air throttle and a gas throttle are installed on both the air side and gas side passages, and the downstream sides of these are merged to create a common pressure.The pressure upstream of the two throttles is detected by a differential pressure sensor, and the combustion output is adjusted. Since the air-fuel ratio is controlled to be constant using the output of the corresponding differential pressure sensor, the pressure adjustment error is smaller compared to conventional mechanical pressure equalization valve control, and combustion control accuracy is improved. Since it is possible to control by reducing the differential pressure of a differential pressure sensor instead of using a scale, it can be applied to household combustion equipment where blowers, etc. are downsized and the supply gas pressure, such as city gas, is low. It is something to do.
そしてまた、差圧センサの出力が空気量に対応した比較
基準値以上のとき出力を発生する差圧比較器を備えたこ
とによシ、供給ガス圧が低下したシ、燃焼機器に強風が
作用した場合でも、ガス量調節手段に優先して空気量調
節手段を制御するようにしたことによシ燃焼可変範囲全
域にわたって″ 許容空燃比の上限値を越えることがな
いように制御できる。したがって、常に燃焼状態を安定
させることが出来るので安全性の高い燃焼機器の実現を
可能にするものである。Furthermore, by installing a differential pressure comparator that generates an output when the output of the differential pressure sensor is equal to or higher than the comparison reference value corresponding to the air amount, it is possible to prevent the supply gas pressure from decreasing and the combustion equipment to be affected by strong winds. Even in such a case, by controlling the air amount adjusting means with priority over the gas amount adjusting means, it is possible to control the air-fuel ratio so as not to exceed the upper limit of the allowable air-fuel ratio over the entire variable combustion range. Since the combustion state can always be stabilized, it is possible to realize highly safe combustion equipment.
第１図は従来のガス燃焼制御装置の構成説明図。
第２図は本発明のガス燃焼制御装置の一実施例を示す構
成及びブロック説明図、第３図は本発明の上記一実施例
に於ける制御動作説明図、第４図は本発明上記一実施例
に於けるガス給湯機器の給湯能力特性図であ暮。
１・・・・・・送風機、２・・・・・・空気数シ、３・
・・・・・混合部。
４・・・・・・差圧センサ、６・・・・・・ガス絞９．
６・・・・・・バーナ、７Ｇ・・・・・・ガス量調節手
段、７Ａ−１，、、空気量調節手段、１０・・・・・・
温度検出器、１１・・・・・・ガス側通路、１２・・・
・・・空気側通路、１４・・・・・・温度設定器、１５
・・・・・・温度調節回路、１９・・・・・・差圧比較
器。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
２ 図
第３図
第４図FIG. 1 is an explanatory diagram of the configuration of a conventional gas combustion control device. Fig. 2 is a configuration and block explanatory diagram showing one embodiment of the gas combustion control device of the present invention, Fig. 3 is an explanatory diagram of control operation in the above embodiment of the present invention, and Fig. 4 is an explanatory diagram of the control operation in the above embodiment of the present invention. This is a characteristic diagram of the hot water supply capacity of the gas hot water supply equipment in the example. 1...Blower, 2...Number of air, 3.
...Mixing section. 4... Differential pressure sensor, 6... Gas throttle 9.
6...Burner, 7G...Gas amount adjustment means, 7A-1, Air amount adjustment means, 10...
Temperature detector, 11...Gas side passage, 12...
... Air side passage, 14 ... Temperature setting device, 15
...Temperature control circuit, 19...Differential pressure comparator. Name of agent: Patent attorney Toshio Nakao and 1 other person 1st
Figure 2 Figure 3 Figure 4
Claims (1)
節手段と空気絞りとを、ガス側通路にはガス量調節手段
とガス絞９を＾己設し、この空気絞りとガス絞シとの下
流を合流して空気とガスを混合する混合部と、前記空気
絞シの上流とガス絞りの上流との圧力差に対応した電気
信号を発生する差圧センサを具備す仝と共綽、バーナに
より加熱される被加熱体の温度を検出する温度検出器と
、被加熱体の出口温度を設定する温度設定器と、前記温
度検出器の信号と前記温度設定器の信号との差を増巾演
算する温度調節回路と、前記差圧センサの出力の絶対値
が空気量に対応した比較基準値以上のとき出力を発生す
る差圧比較器を有し、前記温度調節回路からの出力で前
記空気量調節手段を制御し、かつ、前記差圧センサの出
力に応じて前記ガス量調節手段を制御するとともに、前
記差圧比較器の出力が発生した時は、前記温度調節回路
に優先して前記差圧センサの信号に応じて前記空気量調
節手段を制御するガス燃焼制御装置。The air side passage is equipped with a blower for supplying combustion air, an air volume adjustment means, and an air throttle, and the gas side passage is equipped with a gas volume adjustment means and a gas throttle 9. a mixing unit that mixes air and gas by merging downstream of the air throttle, and a differential pressure sensor that generates an electric signal corresponding to the pressure difference between the upstream of the air throttle and the upstream of the gas throttle; A temperature detector that detects the temperature of the object to be heated heated by the burner, a temperature setting device that sets the outlet temperature of the object to be heated, and an increase in the difference between the signal of the temperature detector and the signal of the temperature setting device. It has a temperature adjustment circuit that calculates the width, and a differential pressure comparator that generates an output when the absolute value of the output of the differential pressure sensor is equal to or higher than a comparison reference value corresponding to the air amount, and the output from the temperature adjustment circuit controls the air amount adjusting means, and controls the gas amount adjusting means according to the output of the differential pressure sensor, and when the output of the differential pressure comparator is generated, it takes priority over the temperature adjusting circuit. A gas combustion control device that controls the air amount adjusting means according to a signal from the differential pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57207906A JPS5997422A (en) | 1982-11-27 | 1982-11-27 | Gas combustion control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP57207906A JPS5997422A (en) | 1982-11-27 | 1982-11-27 | Gas combustion control device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5997422A true JPS5997422A (en) | 1984-06-05 |
| JPH0221483B2 JPH0221483B2 (en) | 1990-05-15 |
Family
ID=16547524
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP57207906A Granted JPS5997422A (en) | 1982-11-27 | 1982-11-27 | Gas combustion control device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5997422A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0887590A1 (en) * | 1997-06-27 | 1998-12-30 | Compagnie Europeenne Pour L'equipement Menager "Cepem" | Total premixing type gas burner for domestic cooking |
-
1982
- 1982-11-27 JP JP57207906A patent/JPS5997422A/en active Granted
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0887590A1 (en) * | 1997-06-27 | 1998-12-30 | Compagnie Europeenne Pour L'equipement Menager "Cepem" | Total premixing type gas burner for domestic cooking |
| FR2765313A1 (en) * | 1997-06-27 | 1998-12-31 | Europ Equip Menager | TOTAL PREMIX GAS BURNER FOR DOMESTIC COOKING |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0221483B2 (en) | 1990-05-15 |
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