JPS618520A - Burning safety device - Google Patents

Burning safety device

Info

Publication number
JPS618520A
JPS618520A JP59130339A JP13033984A JPS618520A JP S618520 A JPS618520 A JP S618520A JP 59130339 A JP59130339 A JP 59130339A JP 13033984 A JP13033984 A JP 13033984A JP S618520 A JPS618520 A JP S618520A
Authority
JP
Japan
Prior art keywords
flame
circuit
primary air
blower
output value
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
Application number
JP59130339A
Other languages
Japanese (ja)
Inventor
Yoshifumi Moriya
好文 守屋
Hideki Kaneko
秀樹 金子
Masahiro Indo
引頭　正博
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP59130339A priority Critical patent/JPS618520A/en
Publication of JPS618520A publication Critical patent/JPS618520A/en
Pending legal-status Critical Current

Links

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
    • F23N5/126—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 electrical or electromechanical means
    • 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
    • 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
    • F23N2235/14—Fuel valves electromagnetically operated

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)

Abstract

PURPOSE:To enable the detection of oxygen deficiency by a flame rod in a full primary air type burner by a method wherein an output value from a proportional circuit is inputted to a driving circuit for driving a solenoid valve. CONSTITUTION:A flame rod 3 is provided as a flame detecting element above a flame hole 1 of a full primary air type burner 2 having a gauze for the flame hole 1. A memory circuit 4 stores the output value from the flame rod 3, a comparison circuit 5 compares the output from the flame rod 3, a driving circuit 7 drives a solenoid valve 6, the air flowing quantity of a blower 8 arranged under the full primary air type burner 2 can be changed-over to strong mode and weak mode. Under the constant burning condition, the amount of an ion electric current value is compared nearly at the air flowing quantity changing-over time of the blower 8, then the changing-over mode under operation condition can be discriminated based on the border of equivalance ratio. Thereby, in case that the initial setting is made so that the equivalance ratio is kept at one under the required indoor oxygen concentration to be detected, the required oxygen concentration can be estimated when the equivalance ratio exceeds one, accordingly, the solenoid valve 6 is closed by the driving circuit 7, the burning can be stopped.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、火炎検知素子を用いた全１次空気式燃焼装置
に対する不完全燃焼防止技術に関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a technique for preventing incomplete combustion in an all-primary air combustion apparatus using a flame detection element.

従来例の構成とその問題点 全１次空気式燃焼装置に対する火炎検知素子を用いた燃
焼安全装置として、特開昭５８−１２９１１６号公報の
発明が挙げられる。この発明は、メインバーナとパイロ
ットバーナとを燃焼用送風機からの空気を１次空気とし
て燃焼する全１次空気式のガスバーナに構成し、各燃焼
面に夫々各別のフレームロッドを臨ませて、メインバー
ナのフレーム電流値とパイロットバーナのフレーム電流
値とを検出し、これらフレーム電流値を夫々電流−電圧
変換器と増幅器とを介して比較器に入力し、この比較器
の出力で燃焼を制御するようにし、増幅器の増幅率を弱
燃焼時のフレーム電流値の変化特性に対応して設定する
と共に、強運転時における間欠的な弱運転への切換を与
えるようにしている。Conventional Structure and Problems There is an invention disclosed in Japanese Patent Application Laid-Open No. 129116/1983 as a combustion safety device using a flame detection element for an all-primary air type combustion device. This invention comprises a main burner and a pilot burner as an all-primary air type gas burner that burns air from a combustion blower as primary air, and has separate flame rods facing each combustion surface, Detects the flame current value of the main burner and the flame current value of the pilot burner, inputs these flame current values to a comparator via a current-voltage converter and an amplifier, and controls combustion with the output of this comparator. The amplification factor of the amplifier is set in accordance with the change characteristics of the flame current value during weak combustion, and intermittent switching to weak operation during strong operation is provided.

この発明では、酸欠検知する場合、メインバーナとパイ
ロットバーナの電位差を比較するため、必ずパイロット
バーナが必要であり、構成・制御が複雑になる。また、
強燃焼時の酸欠検知は、強制的な弱燃焼への切換が必須
であり、室内の温度調整とは無関係に行なわれるため、
使い勝手が悪い等の問題がある。さらに、燃焼速度の速
いガス種では、メインバーナとパイロットバーナの電位
差の変位が少ないため、酸欠検知が難しい。In this invention, in order to compare the potential difference between the main burner and the pilot burner when detecting oxygen deficiency, a pilot burner is always required, making the configuration and control complicated. Also,
Oxygen deficiency detection during strong combustion requires a forced switch to weak combustion, and is performed independently of indoor temperature adjustment.
There are problems such as poor usability. Furthermore, in the case of gases with a high combustion rate, the potential difference between the main burner and the pilot burner has little variation, making it difficult to detect oxygen deficiency.

発明の目的 本発明は、かかる従来の問題を解消するもので、全１次
燃焼装置に対し、火炎検知素子を用い、メインバーナの
みによる不完全燃焼防止技術を提供することを目的とす
る。OBJECTS OF THE INVENTION The present invention solves these conventional problems, and aims to provide a technique for preventing incomplete combustion using only the main burner by using a flame detection element for all primary combustion devices.

発明の構成 この目的を達成するために、本発明は、全１次空気式バ
ーナと風量可変の送風機と、前記バーナの炎孔面に臨ま
せた火炎検知素子とを備えるとともに、火炎検知素子か
らの出力値を記憶する記憶回路と、燃焼量一定の条件で
、風量のみ変化させた場合の火炎検知素子の出力値とを
比較する比較回路を備え、前記比較回路からの出力値は
、電磁弁を駆動する駆動回路に与えるようにした燃焼安
全装置である。火炎検知素子として代表的であるフレー
ムロッドを用いた場合について、フレーム電流値と当量
比の関係に関し、第２図を用いて、簡単に述べでおく、
横軸には当量比φを、縦軸には、フレーム電流値Ｉｆを
示す。当量比φが１付近において、フレーム電流値１１
は最高値を示す上に凸の関係がある。第３図も、第２図
と同様に横軸に当量比を、縦軸にフレーム電流値を示す
。Structure of the Invention In order to achieve this object, the present invention includes an all-primary air burner, a blower with variable air volume, and a flame detection element facing the flame hole surface of the burner. A memory circuit that stores the output value of the flame detection element and a comparison circuit that compares the output value of the flame detection element when only the air flow rate is changed under the condition that the combustion amount is constant, and the output value from the comparison circuit is This is a combustion safety device that provides safety to the drive circuit that drives the engine. In the case where a flame rod, which is a typical flame detection element, is used, the relationship between the flame current value and the equivalence ratio will be briefly described using Fig. 2.
The horizontal axis shows the equivalence ratio φ, and the vertical axis shows the frame current value If. When the equivalence ratio φ is around 1, the flame current value is 11
has a convex relationship with the highest value. Similarly to FIG. 2, FIG. 3 also shows the equivalence ratio on the horizontal axis and the flame current value on the vertical axis.

全１次空気式バーナでは、送風機の風量変化に応じて、
当量比も変わり、その変化は、風量が増加すれば、当量
比が低下する方向に、すな′わち１次空気量が増大し、
風量が減少すれば、当量比が大きくなる。In all primary air burners, depending on the change in air volume of the blower,
The equivalence ratio also changes, and the change is such that as the air volume increases, the equivalence ratio decreases, that is, the primary air volume increases,
As the air volume decreases, the equivalence ratio increases.

こうした事実に基づいて、この構成について考えるなら
ば、第３図のａに示されるごとく、当量比を１以下に設
定する場合、火炎検知素子としてフレームロッドを用い
るならば、その時のフレーム電流値Ｉ（はａに示される
値として記憶回路に納められる。ここでもし、送風機の
風量を減少させるならば、前述したように、光量比は増
加し、ａｌＯ値となり、その結果として、イオン電流値
も増加する。逆に風量を増加させるならば、当量比は減
少し、ａ２となり、イオン電流値も減少する。他方、当
量比を１以上のＣに設定する場合について、先に述べた
同じ議論を考えてみる。送風機の風量を減少させると、
当量比は増加しＣｌ。Considering this configuration based on these facts, if the equivalence ratio is set to 1 or less and a flame rod is used as the flame detection element, then the flame current value I (is stored in the memory circuit as the value shown in a. Here, if the air volume of the blower is decreased, the light amount ratio increases and becomes the alO value as described above, and as a result, the ion current value also increases. On the other hand, if the air volume is increased, the equivalence ratio decreases to a2, and the ion current value also decreases.On the other hand, when the equivalence ratio is set to C greater than 1, the same argument mentioned earlier can be applied. Think about it: If you reduce the airflow of the blower,
The equivalence ratio increases and Cl.

値となり、火炎が伸長してくるため、イオン電流値は減
少する・逆に送風機の風量を増加させるならば、当量比
は減少し、ｃ２の値となり、このため燃焼速度が増加し
、火炎は短くなシ、イオン電流値は増加する。以上述べ
てきたように、当量比が１以上か、以下であるかによシ
、送風機の風量を変化させることによるイオン電流値の
特性は、相反するようになる。value and the flame elongates, so the ion current value decreases.Conversely, if the air volume of the blower is increased, the equivalence ratio decreases and reaches the value of c2, so the combustion speed increases and the flame As the time becomes shorter, the ion current value increases. As described above, depending on whether the equivalence ratio is 1 or more or less than 1, the characteristics of the ion current value by changing the air volume of the blower become contradictory.

従って、この構成のごとく、風量を変化させる前のイオ
ン電流値を記憶しておき、その後風量を変化させた時の
イオン電流値と、記憶されているイオン電流値を比較す
るどとによシ、光量比が１以上か１以下かを容易に判定
でき、このことは、室内酸素濃度がある値になった時に
、燃焼を停止させたい場合、この酸素濃度において、当
量比が１になるように、初期の当量比を設定しておきさ
えすれば、全１次空気式バーナにおいても、火炎検知素
子により容易にその酸素濃度を判定できることを意味す
る。Therefore, as in this configuration, the ion current value before changing the air volume is memorized, and then the ion current value when the air volume is changed is compared with the stored ion current value. , it is easy to determine whether the light intensity ratio is greater than or equal to 1 or less than 1. This means that if you want to stop combustion when the indoor oxygen concentration reaches a certain value, you need to make sure that the equivalence ratio becomes 1 at this oxygen concentration. This means that, as long as the initial equivalence ratio is set, the oxygen concentration can be easily determined by the flame detection element even in an all-primary air burner.

実施例の説明 以下、本発明の一実施例について、第１図を用いて説明
する。金網を炎孔１とする全１次空気式バーナ２の炎孔
１上方に、フレームロッド３を設け、フレームロッド３
からの出力値を記憶する記憶回路４とフレームロッド３
からの出力値を比較する比較回路６と、電磁弁６を駆動
する駆動回路７を備え、送風機８は、全１次空気式バー
ナ２の下方に設けられており、風量は強弱二段に切替え
が可能である。DESCRIPTION OF EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG. A frame rod 3 is provided above the flame hole 1 of the all-primary air burner 2 whose flame hole 1 is made of wire mesh.
A memory circuit 4 that stores the output value from the frame rod 3
The blower 8 is provided below all the primary air burners 2, and the air volume is switched in two stages, high and low. is possible.

上記構成によれば、当量比φく１で、風量は強の状態で
あると、火炎は炎孔１上で均一に薄く形成される表面燃
焼火炎であり、この状態でフレームロッド３から得られ
るイオン電流値をａとすると、ａの値は記憶回路４に格
納されている。この時、風量を弱に切替えると、当量比
は、切替前よりも増加し、イオン電流値は増加すること
なシ、この値をｂとするならば、比較回路５により、送
風機の強から弱への切替により、イオン電流値は、ａ’
　ｂに増加したことが判断でき、このことは、現在の燃
焼状態における当量比が１よりも小さいことを示す。仁
の一連の動作を、適当なインターバルのもとに繰り返す
ことによシ、燃焼における尚量比変化を把握することが
でき、もし、当量比が１を越えたならば、この一連の動
作は、次のようにして、それを示してくれる。捷ず、風
量の変化前のイオン電流値Ｃは、記憶回路４に納められ
ており、風量が弱に切替りた後のイオン電流値をｄとす
ると、このｄは、風量が切替りたことにより当量比が増
加したにもかかわらず、Ｃと比較した場合には、火炎が
伸長してイオン電流値が減少し、火炎が伸長するという
ことは、当量比が１を越えていることを示すことになる
。また、風量が弱の状態から強に切替えた場合も、同様
な議論により説明される。According to the above configuration, when the equivalence ratio φ is 1 and the air flow is strong, the flame is a surface combustion flame that is formed uniformly and thinly on the flame hole 1, and in this state, the flame is obtained from the flame rod 3. Letting the ion current value be a, the value of a is stored in the memory circuit 4. At this time, if the air volume is switched to weak, the equivalence ratio increases compared to before switching, and the ion current value does not increase.If this value is b, then the comparison circuit 5 changes the blower from strong to weak. By switching to , the ion current value becomes a'
b, which indicates that the equivalence ratio in the current combustion state is smaller than 1. By repeating this series of actions at appropriate intervals, it is possible to grasp the change in the equivalence ratio during combustion.If the equivalence ratio exceeds 1, this series of actions is , shows it as follows. The ion current value C before the air volume changes without switching is stored in the memory circuit 4, and if the ion current value after the air volume is switched to weak is d, then this d indicates that the air volume has been switched. Even though the equivalence ratio has increased, when compared with C, the flame elongates and the ionic current value decreases, and the elongation of the flame indicates that the equivalence ratio exceeds 1. It turns out. Further, the case where the air volume is switched from a weak state to a strong state can also be explained using a similar argument.

このように、燃焼量を一定にして、送風機の風量を切替
えた時の前後のイオン電流値の大小関係を比較すること
により、現在の燃焼が当量比１を境界にして、どちら側
で行なわれているかを判別できる。これにより、検知し
たい室内酸素濃度下で当量比が１になるように、初期（
酸素濃度２０．６％）の当量比を逆算して、設定するな
らば、前述した一連の動作により、当量比が１を越えた
と判定できた時点で、所要酸素濃度と推定でき、駆動回
路７により電磁弁６を閉止し、燃焼を停止することがで
きる。この議論は、ダンパが閉塞され、当量比が１を越
え、ブンゼン火炎になったかどうかを判定する場合にも
、全く同様に説明され、成立するため、ダンパ閉塞等の
１次空気不足の検知にも本発明は適用できる。In this way, by keeping the combustion amount constant and comparing the magnitude relationship of the ion current values before and after switching the airflow rate of the blower, it is possible to determine which side of the equivalence ratio 1 the current combustion is taking place on. It is possible to determine whether As a result, the initial (
If the equivalence ratio (oxygen concentration 20.6%) is set by back calculation, the required oxygen concentration can be estimated as soon as it is determined that the equivalence ratio exceeds 1 through the series of operations described above, and the drive circuit 7 The solenoid valve 6 can be closed and combustion can be stopped. This argument can be explained and held in exactly the same way when determining whether a damper is blocked and the equivalence ratio exceeds 1, resulting in a Bunsen flame. The present invention is also applicable.

発明の効果 （１）風量を変化させた前後での火炎検知素子の顕著な
出力変化を比較するため、全１次空気式バーナにおいて
も、フレームロッドによる酸欠が可能となる。Advantages of the Invention (1) In order to compare the remarkable output change of the flame detection element before and after changing the air volume, oxygen deficiency by the flame rod is possible even in an all-primary air burner.

（２）原理的に、当量比変化を間接的に把握することに
なるので、ダンパ閉塞等の１次空気量の不足による不完
全燃焼が検知できる。(2) In principle, changes in the equivalence ratio can be detected indirectly, so incomplete combustion due to insufficient primary air volume, such as damper blockage, can be detected.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は本発明の一実施例である燃焼安全装置の断面図
、第２図は当量比とフレーム電流値との関係を示す特性
図、第３図は本発明の装置における当量比とフレーム電
流値の特性図である。 １・・・・炎孔、２　・・・全１次空気式バーナ、３・
・・・火炎検知素子、４・・・・・記憶回路、５・・・
・・比較回路、６・・・電磁弁、７・・・・・駆動回路
、８・・・・・・送風機・ 代理人の氏名　弁理士　中　尾　敏　男　は７５弓名第
１図Fig. 1 is a sectional view of a combustion safety device which is an embodiment of the present invention, Fig. 2 is a characteristic diagram showing the relationship between the equivalence ratio and the flame current value, and Fig. 3 is a diagram showing the equivalence ratio and flame in the apparatus of the present invention. It is a characteristic diagram of a current value. 1...flame hole, 2...all primary air burner, 3...
...Flame detection element, 4...Memory circuit, 5...
... Comparison circuit, 6 ... Solenoid valve, 7 ... Drive circuit, 8 ... Blower Agent's name Patent attorney Toshio Nakao is 75 years old Figure 1

Claims (1)

【特許請求の範囲】[Claims] 全１次空気式バーナと風量可変の送風機と、前記バーナ
の炎孔面に臨ませた火炎検知素子と、前記火炎検知素子
からの出力値を記憶する記憶回路と、燃焼量一定の条件
で、風量のみ変化させた場合の火炎検知素子の出力値お
よび前記記憶回路に貯えられた火炎検知素子の出力値と
を比較する比較回路を備え、前記比較回路からの出力値
は、電磁弁を駆動する駆動回路に与えるようにした燃焼
安全装置。A total primary air burner, a blower with variable air volume, a flame detection element facing the flame hole surface of the burner, a memory circuit that stores the output value from the flame detection element, and under the condition that the combustion amount is constant, A comparison circuit is provided for comparing an output value of the flame detection element when only the air volume is changed and an output value of the flame detection element stored in the memory circuit, and the output value from the comparison circuit drives a solenoid valve. Combustion safety device provided to the drive circuit.
JP59130339A 1984-06-25 1984-06-25 Burning safety device Pending JPS618520A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP59130339A JPS618520A (en) 1984-06-25 1984-06-25 Burning safety device

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP59130339A JPS618520A (en) 1984-06-25 1984-06-25 Burning safety device

Publications (1)

Publication Number Publication Date
JPS618520A true JPS618520A (en) 1986-01-16

Family

ID=15032010

Family Applications (1)

Application Number Title Priority Date Filing Date
JP59130339A Pending JPS618520A (en) 1984-06-25 1984-06-25 Burning safety device

Country Status (1)

Country Link
JP (1) JPS618520A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS63306718A (en) * 1987-06-08 1988-12-14 Nec Corp Serial access circuit
US4817056A (en) * 1986-07-30 1989-03-28 Mitsubishi Denki Kabushiki Kaisha Semiconductor memory device
US4849938A (en) * 1986-07-31 1989-07-18 Mitsubishi Denki Kabushiki Kaisha Semiconductor memory device
JPH05242693A (en) * 1992-02-28 1993-09-21 Mitsubishi Electric Corp Semiconductor storage device

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4817056A (en) * 1986-07-30 1989-03-28 Mitsubishi Denki Kabushiki Kaisha Semiconductor memory device
US4849938A (en) * 1986-07-31 1989-07-18 Mitsubishi Denki Kabushiki Kaisha Semiconductor memory device
JPS63306718A (en) * 1987-06-08 1988-12-14 Nec Corp Serial access circuit
JPH05242693A (en) * 1992-02-28 1993-09-21 Mitsubishi Electric Corp Semiconductor storage device

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