JP3712499B2 - Combustor oxygen deficiency safety device - Google Patents

Combustor oxygen deficiency safety device Download PDF

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Publication number
JP3712499B2
JP3712499B2 JP11107197A JP11107197A JP3712499B2 JP 3712499 B2 JP3712499 B2 JP 3712499B2 JP 11107197 A JP11107197 A JP 11107197A JP 11107197 A JP11107197 A JP 11107197A JP 3712499 B2 JP3712499 B2 JP 3712499B2
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Japan
Prior art keywords
burner
oxygen deficiency
draft
gas
flame
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
Application number
JP11107197A
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Japanese (ja)
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JPH10300093A (en
Inventor
智志 金岩
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Rinnai Corp
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Rinnai Corp
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
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Priority to JP11107197A priority Critical patent/JP3712499B2/en
Publication of JPH10300093A publication Critical patent/JPH10300093A/en
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Publication of JP3712499B2 publication Critical patent/JP3712499B2/en
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Description

【0001】
【発明の属する技術分野】
本発明は、ガスを燃料とするストーブ、湯沸かし器の如き燃焼器に関し、更に詳しくは、燃焼器を設置した室内の空気が酸欠状態になったときガスを止めるようにした、燃焼器の酸欠安全装置に関する。
【0002】
【従来の技術】
従来、燃焼器を設置した室内の空気が酸欠状態であるか否かを検知し、酸欠状態になった場合にガスを止める酸欠安全装置は知られており、該装置としては、例えば実開平2-36745 号公報に示されるものがある。該装置は、燃焼器のケースに常火の酸欠検知バーナとこれに対向するサーモカップルを設け、該サーモカップルの出力が変化したとき、主バーナのガス安全弁を閉じるようにしてあり、また、酸欠検知バーナの炎が風で揺れてサーモカップルの出力が乱れるのを防止するために、該酸欠検知バーナを覆体でカバーしている。
【0003】
燃焼器を設置した室内の空気が酸欠状態になると酸欠検知バーナの炎が伸び、ついに酸欠炎となってリフトし、この状態変化に伴ってサーモカップルで検出する温度と出力が変化するから、これによりガス安全弁は閉じる。
【0004】
しかし、このリフト状態は、ガス種によって異なり、ガス安全弁が作動する酸素濃度もガス種によって異なる。しかも、酸欠検知バーナの炎の揺れを防止する覆体の大きさも適切でなければ、同じ酸素濃度でもガス安全弁が作動しない場合がある。
【0005】
【発明が解決しようとする課題】
本発明は、燃焼器の酸欠安全装置が正しく作動できるようにすること、及び該装置を低コストで作ることを課題とする。
【0006】
【課題を解決するための手段】
前記課題を解決するための手段は、請求項1に記載したとおり、排気出口を上部にもち、主バーナを内部に取り付けたケースと、主バーナの下方に設けた酸欠検知バーナと、該酸欠検知バーナの炎を検知する炎検知素子と、該炎検知素子の出力で作動するガス安全弁とを備える燃焼器の酸欠安全装置において、前記ケースの底部に取り付ける底板における前記酸欠検知バーナの炎口の下方位置に、穴を開けないドラフト抑制部を設け、底板の該ドラフト抑制部以外の位置に多数の空気穴を全体的に設け、前記ドラフト抑制部の広さを、使用するガスのリフト性が大きいものでは広く、小さいものでは狭く設定したことを特徴とする。
【0007】
該手段によれば、ケース内に底部から異物が侵入するのを底板で防止することができ、且つガス種に適応した広さのドラフト抑制部をもつ底板をケースに取り付ければ、酸欠検知バーナの炎がドラフト空気によって変動されず、適正に酸欠状態が検出できる。
【0008】
【発明の実施の形態】
以下、図面を参照して本発明を壁掛け型のガスストーブに実施した形態を説明する。図1,2で1は燃焼器として壁掛け型のガスストーブを示し、2はそのケースで、該ケース2は、前面板3、上板4、後面板5、底板6を結合してなり、前面板3の上部に排気出口7が設けられる。底板6は、図3(A)(B)に示すように、多数の空気穴6aと面積が異なるドラフト抑制部6b1 又は6b2 をもつ2種類があり、面積の小さいドラフト抑制部6b1 をもつ底板61 は、リフト性の小さいガス、例えば13Aガスの場合に使用され、面積の大きいドラフト抑制部6b2 をもつ底板62 は、リフト性の大きいガス、例えばLPGの場合に使用される。
【0009】
後面板5の内部両側には縦ビーム8,9が固定され、両縦ビーム8,9の下方位置に渡って主バーナ10が固定され、該主バーナ10の前方下位にパイロットバーナ取り付け板11が固定されている。一方の縦ビーム9の外側面には、ガス安全弁12aを内設したガス元弁12が取り付けられ、これにガス流入管13,主ガス管14,パイロットガス管15が接続される。前記ガス流入管13aの入り口にはガスホース接続管16が接続され、主ガス管14の先端は主バーナ10に接続され、パイロットガス管15の先端は主バーナ10への点火用のパイロットバーナ17に接続される。該パイロットバーナ17は、酸欠検知バーナであり、この該パイロットバーナ17と点火プラグ18とサーモカップル19は、セット板20を介してパイロットバーナ取り付け板11に固定される。
【0010】
サーモカップル19は、パイロットバーナ17の炎の温度を検知するための炎検知素子として作用し、そのリード線19aがガス安全弁12に接続されている。なお、サーモカップル19の出力を図外の制御回路に入力し、該制御回路によってガス安全弁12aを制御するようにしてもよい。
【0011】
この実施の形態は、主バーナ10に点火するためのパイロットバーナ17を酸欠検知バーナとして使用するものであるが、これとは別の小さいバーナを取り付けて使用してもよい。
【0012】
また、22aはケース2内の前部に設けた前部排気ガイド板、22bはケース2内の後部に設けた後部排気ガイド板、23は前記ガス流入管13の固定具であり、ガス元弁12の弁軸12bに係合した調節軸24が上板4を貫通して設けられ、これに摘み24aが取り付けられる。
【0013】
点火プラグ18から火花放電してパイロットバーナ17に点火し、パイロットバーナ17の炎で主バーナ10に着火して主バーナ10を燃焼させると、これに伴ってドラフトが生じ、底板6のドラフト抑制部以外の位置に全面的に均等に設けた空気穴6aから室内の空気が前部排気ガイド板22aと後部排気ガイド板22bの間に流れ込み、その一部は主バーナ10の燃焼用空気となり、残部は排気と共に排気出口7から排出される。このとき、図4に示すように、主バーナ10の燃焼によるドラフト空気gが空気穴6aを流れても、底板6の前記ドラフト抑制部6b1 又は6b2 は、ドラフト空気gを通さないから、炎fは、ドラフト空気gの流勢の影響を受けず安定した状態で燃焼し、炎fとサーモカップル19は一定の関係を保つ。しかし、室内の空気が酸欠の状態になると、炎fは酸素不足でリフト炎f1 となってサーモカップル19から離れ、サーモカップル19の検出温度が低下するから、ガス安全弁12aを閉じて主バーナ10とパイロトバーナ17を消火する。
【0014】
前記ドラフト抑制部6b1 又は6b2 の面積は、ガスのリフト性が小さいものでは狭く、大きいものでは広くしてあり、例えばガス種が13Aのときは狭いドラフト抑制部6b1 をもつ底板61 を使用し、LPGのときは広いドラフト抑制部6b2 をもつ底板62 を使用する。このように、リフト性の大きいLPGなどにはドラフト抑制部の面積が大きい底板62 を使うので、酸欠検知バーナーとしてのパイロットバーナー17へのドラフト作用が少なく、ガス安全弁12aが早切れすることがない。一方、リフト性の小さい13Aのときはドラフト抑制部の面積が小さい底板61 を使うので、パイロットバーナー17へのドラフト作用が大きく、ガス安全弁12aが遅切れすることがない。
【0015】
なお、図5は参考例を示し、主バーナ10の背後に遮風板25を設け、前記パイロットバーナ取り付け板11と遮風板25で主バーナ10の前後を挟んで、炎fにドラフト空気gが直接接触しないようにしたもので、このようにすれば、炎の冷却が遅れるから、有害なNO2 が出にくい。
【0016】
【発明の効果】
以上のとおり、請求項1の手段によれば、ガス種に適応した広さのドラフト抑制部をもつ底板をケースに取り付けることにより、酸欠検知バーナの炎がドラフト空気によって変動されず、適正にガス安全弁を作動できる効果がある。また該底板により異物がケース内に侵入するのを防止できる。
【図面の簡単な説明】
【図1】 本発明の実施の形態を示す正面図
【図2】 同じく縦断側面図
【図3】 2種類の底板の平面図
【図4】 要部の正面図
【図5】 参考例の側面図
【符号の説明】
2 ケース 6,61,62 底板
6a 空気穴 6b1 ,6b2 ドラフト抑制部
10 主バーナ 12 ガス元弁
12a ガス安全弁 17 酸欠検知バーナ
19 サーモカップル
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a combustor such as a gas-fired stove or a water heater, and more particularly, a combustor having a lack of oxygen when the air in the room where the combustor is installed is deprived of oxygen. It relates to safety devices.
[0002]
[Prior art]
Conventionally, an oxygen deficiency safety device that detects whether or not the air in a room where a combustor is installed is in an oxygen deficiency state and stops gas when it is in an oxygen deficiency state is known. There is one disclosed in Japanese Utility Model Publication No. 2-36745. The apparatus is provided with a short-burning oxygen deficiency detection burner and a thermocouple facing the burner case, and when the output of the thermocouple changes, the gas safety valve of the main burner is closed, and In order to prevent the flame of the oxygen deficiency detection burner from being shaken by the wind and disturbing the output of the thermocouple, the oxygen deficiency detection burner is covered with a cover.
[0003]
When the air in the room where the combustor is installed becomes oxygen deficient, the flame of the oxygen deficiency detection burner extends and finally lifts as oxygen deficient flame, and the temperature and output detected by the thermocouple change with this state change. Thus, the gas safety valve is closed.
[0004]
However, this lift state differs depending on the gas type, and the oxygen concentration at which the gas safety valve operates also differs depending on the gas type. In addition, if the size of the cover that prevents the flame of the oxygen deficiency detection burner is not appropriate, the gas safety valve may not operate even at the same oxygen concentration.
[0005]
[Problems to be solved by the invention]
It is an object of the present invention to enable a combustor oxygen deficiency safety device to operate correctly and to make the device low cost.
[0006]
[Means for Solving the Problems]
Means for solving the above-mentioned problems include a case having an exhaust outlet at the top and a main burner mounted therein, an oxygen deficiency detection burner provided below the main burner, and the acid In the oxygen deficiency safety device of a combustor comprising a flame detection element for detecting a flame of a deficiency detection burner and a gas safety valve that operates by the output of the flame detection element, the deficiency detection burner of the bottom plate attached to the bottom of the case A draft suppressing part that does not open a hole is provided at a position below the flame opening, and a large number of air holes are provided at positions other than the draft suppressing part on the bottom plate, and the width of the draft suppressing part is set to It is characterized in that it is wide when the lift is large and narrow when it is small.
[0007]
According to this means, it is possible to prevent foreign matter from entering the case from the bottom with the bottom plate, and if a bottom plate having a draft suppressing portion having a width adapted to the gas type is attached to the case, the oxygen deficiency detection burner is provided. The flame is not fluctuated by the draft air, and the oxygen deficiency state can be detected properly.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment in which the present invention is implemented in a wall-mounted gas stove will be described with reference to the drawings. 1 and 2, reference numeral 1 denotes a wall-mounted gas stove as a combustor, and reference numeral 2 denotes a case. The case 2 includes a front plate 3, an upper plate 4, a rear plate 5, and a bottom plate 6. An exhaust outlet 7 is provided at the top of the face plate 3. As shown in FIGS. 3 (A) and 3 (B), there are two types of bottom plate 6 having a draft suppressing portion 6b1 or 6b2 having a different area from many air holes 6a, and having a draft suppressing portion 6b1 having a small area. Is used in the case of a gas having a low liftability, for example, 13A gas, and the bottom plate 62 having the draft suppression portion 6b2 having a large area is used in the case of a gas having a high liftability, for example, LPG.
[0009]
Longitudinal beams 8 and 9 are fixed to both inner sides of the rear plate 5, a main burner 10 is fixed over the lower positions of both the vertical beams 8 and 9, and a pilot burner mounting plate 11 is disposed at a lower front side of the main burner 10. It is fixed. A gas source valve 12 having a gas safety valve 12a is attached to the outer surface of one vertical beam 9, and a gas inflow pipe 13, a main gas pipe 14, and a pilot gas pipe 15 are connected to the gas main valve 12. A gas hose connection pipe 16 is connected to the inlet of the gas inflow pipe 13a, the tip of the main gas pipe 14 is connected to the main burner 10, and the tip of the pilot gas pipe 15 is connected to the pilot burner 17 for igniting the main burner 10. Connected. The pilot burner 17 is an oxygen deficiency detection burner, and the pilot burner 17, the spark plug 18, and the thermocouple 19 are fixed to the pilot burner mounting plate 11 via a set plate 20.
[0010]
The thermocouple 19 functions as a flame detection element for detecting the flame temperature of the pilot burner 17, and its lead wire 19 a is connected to the gas safety valve 12. Note that the output of the thermocouple 19 may be input to a control circuit (not shown), and the gas safety valve 12a may be controlled by the control circuit.
[0011]
In this embodiment, the pilot burner 17 for igniting the main burner 10 is used as an oxygen deficiency detection burner, but a small burner other than this may be used.
[0012]
22a is a front exhaust guide plate provided at the front part in the case 2, 22b is a rear exhaust guide plate provided at the rear part in the case 2, and 23 is a fixture for the gas inflow pipe 13. An adjustment shaft 24 engaged with the 12 valve shafts 12b is provided through the upper plate 4, and a knob 24a is attached thereto.
[0013]
When a spark is discharged from the spark plug 18 to ignite the pilot burner 17 and the main burner 10 is ignited by the flame of the pilot burner 17 to burn the main burner 10, a draft is generated accordingly, and a draft suppression portion of the bottom plate 6 is generated. The air in the room flows between the front exhaust guide plate 22a and the rear exhaust guide plate 22b from the air holes 6a that are uniformly provided over the entire position, and a part of the air becomes combustion air for the main burner 10, and the rest Is discharged from the exhaust outlet 7 together with the exhaust. At this time, as shown in FIG. 4, even if the draft air g due to the combustion of the main burner 10 flows through the air hole 6a, the draft suppression portion 6b1 or 6b2 of the bottom plate 6 does not pass the draft air g. Burns in a stable state without being affected by the flow of the draft air g, and the flame f and the thermocouple 19 maintain a certain relationship. However, when the indoor air is in an oxygen deficient state, the flame f becomes a lift flame f1 due to lack of oxygen and leaves the thermocouple 19 so that the temperature detected by the thermocouple 19 decreases, so the gas safety valve 12a is closed and the main burner is closed. Extinguish 10 and pilot burner 17.
[0014]
The area of the draft suppressing portion 6b1 or 6b2 is narrow when the gas lift property is small and wide when it is large. For example, when the gas type is 13A, the bottom plate 61 having the narrow draft suppressing portion 6b1 is used. In the case of LPG, a bottom plate 62 having a wide draft suppressing portion 6b2 is used. In this way, since the bottom plate 62 having a large draft suppression portion is used for LPG having a high liftability, the draft action on the pilot burner 17 as an oxygen deficiency detection burner is small, and the gas safety valve 12a may be cut off quickly. Absent. On the other hand, in the case of 13A having a small lift, since the bottom plate 61 having a small area of the draft suppressing portion is used, the draft action to the pilot burner 17 is great and the gas safety valve 12a is not delayed.
[0015]
FIG. 5 shows a reference example, in which a wind shield plate 25 is provided behind the main burner 10, and the pilot burner mounting plate 11 and the wind shield plate 25 sandwich the front and rear of the main burner 10, and the draft f In this way, since the cooling of the flame is delayed, harmful NO2 is not easily produced.
[0016]
【The invention's effect】
As described above, according to the means of claim 1, the flame of the oxygen deficiency detection burner is not fluctuated by the draft air by attaching the bottom plate having the draft suppressing portion having the width adapted to the gas type to the case, and appropriately. The gas safety valve can be activated. Further, the bottom plate can prevent foreign matter from entering the case.
[Brief description of the drawings]
1 is a front view showing an embodiment of the present invention. FIG. 2 is a longitudinal side view of the same. FIG. 3 is a plan view of two types of bottom plates. FIG. 4 is a front view of essential parts. Figure [Explanation of symbols]
2 Case 6, 61, 62 Bottom plate 6a Air hole 6b1, 6b2 Draft suppression part 10 Main burner 12 Gas source valve 12a Gas safety valve 17 Oxygen deficiency detection burner 19 Thermocouple

Claims (1)

排気出口を上部にもち、主バーナを内部に取り付けたケースと、主バーナの下方に設けた酸欠検知バーナと、該酸欠検知バーナの炎を検知する炎検知素子と、該炎検知素子の出力で作動するガス安全弁とを備える燃焼器の酸欠安全装置において、前記ケースの底部に取り付ける底板における前記酸欠検知バーナの炎口の下方位置に、穴を開けないドラフト抑制部を設け、底板の該ドラフト抑制部以外の位置に多数の空気穴を全体的に設け、前記ドラフト抑制部の広さを、使用するガスのリフト性が大きいものでは広く、小さいものでは狭く設定したことを特徴とする燃焼器の酸欠安全装置。A case with an exhaust outlet at the top and a main burner installed inside, an oxygen deficiency detection burner provided below the main burner, a flame detection element for detecting the flame of the oxygen deficiency detection burner, and the flame detection element In the oxygen deficiency safety device for a combustor including a gas safety valve that operates with an output, a bottom plate that is provided with a draft suppressing portion that does not open a hole is provided at a position below the flame opening of the oxygen deficiency detection burner in a bottom plate attached to the bottom of the case. A large number of air holes are generally provided at positions other than the draft suppressing portion, and the width of the draft suppressing portion is set to be wide when the lift property of the gas used is large, and narrow when set small. Combustor oxygen deficiency safety device.
JP11107197A 1997-04-28 1997-04-28 Combustor oxygen deficiency safety device Expired - Lifetime JP3712499B2 (en)

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Application Number Priority Date Filing Date Title
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Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP11107197A JP3712499B2 (en) 1997-04-28 1997-04-28 Combustor oxygen deficiency safety device

Publications (2)

Publication Number Publication Date
JPH10300093A JPH10300093A (en) 1998-11-13
JP3712499B2 true JP3712499B2 (en) 2005-11-02

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Publication number Priority date Publication date Assignee Title
CN113109540B (en) * 2021-04-22 2024-07-12 广东聚德阀门科技有限公司 Dual-fuel oxygen deficiency detection device

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