JPS5851551Y2 - Gas water heater with safety device - Google Patents

Description

【考案の詳細な説明】 この考案は、酸素濃度センサを装着した安全装置付きガ
ス湯沸器に関する。[Detailed Description of the Invention] This invention relates to a gas water heater equipped with a safety device and equipped with an oxygen concentration sensor.

パイロット炎（又はメインバーナ炎）中に酸素濃度セン
サを挿入して雰囲気の酸欠によるパイロット炎のリフト
現象を利用して酸欠状態を検知するものは種々提案され
ているが、この考案はメインバーナの燃焼室内に酸素濃
度センサを挿入して燃焼室内における酸欠ならびに熱交
換器のフィン詰りによる酸素濃度低下により起きる不完
全燃焼を直ちにキャッチして、例えばメインガス通路に
設けたマグネット安全バルブを閉じるなどの安全対策を
施したものである。Various proposals have been made to detect oxygen deficiency conditions by inserting an oxygen concentration sensor into the pilot flame (or main burner flame) and utilizing the lift phenomenon of the pilot flame due to oxygen deficiency in the atmosphere, but this idea is the main one. An oxygen concentration sensor is inserted into the combustion chamber of the burner to immediately detect incomplete combustion caused by a lack of oxygen in the combustion chamber and a decrease in oxygen concentration due to clogging of the heat exchanger fins. Safety measures such as closing the door have been taken.

以下その一実施例を図面とともに説明する。One embodiment will be described below with reference to the drawings.

図面において、１は上部に熱交換器Ａを備えた内胴であ
って、その上部−側に試験管状の酸素濃度センサ２を燃
焼室３内にその先端密閉部４を臨ませて取付け、かつ酸
素濃度センサ２の基端開口部５は外気中に開放させた構
成である。In the drawings, reference numeral 1 denotes an inner shell equipped with a heat exchanger A on the upper side, and a test tube-shaped oxygen concentration sensor 2 is attached to the upper side of the inner shell with its tip sealed portion 4 facing into the combustion chamber 3. The base end opening 5 of the oxygen concentration sensor 2 is configured to be open to the outside air.

なお、酸素濃度センサ２はジルコニア素子等の酸素イオ
ン伝導性固体電解質２ａの内外面２ ｂ 、２ ｂ’に
多孔性の白金製電極板を張設した構造となっている。The oxygen concentration sensor 2 has a structure in which porous platinum electrode plates are stretched on the inner and outer surfaces 2 b and 2 b' of an oxygen ion conductive solid electrolyte 2 a such as a zirconia element.

６゜６′はリード線、７はメインバーナ、ａはその火炎
、８は給電管、９は出湯管である。6°6' is a lead wire, 7 is a main burner, a is its flame, 8 is a power supply pipe, and 9 is a hot water outlet pipe.

前記構成において、正常燃焼時（酸素濃度２１％）は、
酸素濃度センサ２の先端密閉部４がメインバーナ７の火
炎ａの排ガスに包まれているが、メインバーナ７の燃焼
に必要な理論酸素量よりも多くの余剰の酸素が燃焼室３
に供給されているため、酸素濃度センサ２の内外両面２
ｂ、２ｂ’間は酸素濃度差が比較的少なく、シかして起
電力も比較的に小さい。In the above configuration, during normal combustion (oxygen concentration 21%),
The sealed end portion 4 of the oxygen concentration sensor 2 is surrounded by the exhaust gas of the flame a of the main burner 7, but the excess oxygen in the combustion chamber 3 is larger than the theoretical amount of oxygen required for combustion in the main burner 7.
Since the oxygen concentration sensor 2 is supplied to both the inner and outer surfaces 2
The difference in oxygen concentration between b and 2b' is relatively small, and the electromotive force is also relatively small.

雰囲気の酸素濃度が１８％附近に低下して酸欠の状態に
なると燃焼室３内の酸素供給量が減少し不完全燃焼とな
り一酸化炭素ガスの発生が多くなるため、酸素濃度セン
サ２の外面２ｂ’の酸素濃度は非常に低くなり酸素濃度
センサ２の内外面２ｂ、２ｂ’間に大きな酸素濃度差が
生じ、しかしてリード線６，６′から大きな起電力を取
り出し得る。When the oxygen concentration in the atmosphere decreases to around 18% and becomes oxygen deficient, the amount of oxygen supplied in the combustion chamber 3 decreases, resulting in incomplete combustion and increased generation of carbon monoxide gas. The oxygen concentration of the oxygen concentration sensor 2b' becomes extremely low, resulting in a large oxygen concentration difference between the inner and outer surfaces 2b and 2b' of the oxygen concentration sensor 2, and a large electromotive force can be extracted from the lead wires 6 and 6'.

次に熱交換器Ａのフィンが詰った場合にも不完全燃焼と
なるので酸欠時と同様にリード線６．６′から大きな起
電力が得られる。Next, if the fins of heat exchanger A become clogged, incomplete combustion will occur, so a large electromotive force can be obtained from the lead wires 6, 6', as in the case of oxygen deficiency.

この発生起電力の増大する特性を利用してメインガス通
路に設けたマグネット弁全バルブを作動しこれを閉止す
れば安全性の向上を図ることができる。Safety can be improved by utilizing this characteristic of increasing electromotive force to operate and close all the magnetic valves provided in the main gas passage.

以上の如くこの考案は酸素濃度センサ２を火炎ａより離
れた位置に設けたので、火炎ａに衝接させたり火炎ａ内
に挿入して設けた場合に比較して不完全燃焼時に正常燃
焼時に対して生ずる起電力を大きくすることができ、火
炎ａの形状殊に火炎ａの伸びに影響を受けずに酸欠なら
びに熱交換器Ａのフィン詰りを安定して検知することが
できる。As described above, in this invention, since the oxygen concentration sensor 2 is installed at a position distant from the flame a, it is more effective during incomplete combustion and normal combustion than when it is installed in contact with the flame a or inserted into the flame a. The generated electromotive force can be increased, and oxygen deficiency and fin clogging of the heat exchanger A can be stably detected without being affected by the shape of the flame a, particularly the elongation of the flame a.

更にこの考案は、試検管状の酸素濃度センサを内胴の燃
焼室内に臨ませたいとう簡単な構造で、酸欠あるいはフ
ィン詰り時に大きな起電力が起られるので不完全燃焼を
的確に検知してガスの供給を停止するなどの安全措置を
とることができるから実際使用上甚だ有益なものである
。Furthermore, this design has a very simple structure in which a test tube-shaped oxygen concentration sensor is placed inside the combustion chamber of the inner shell, and since a large electromotive force is generated when there is a lack of oxygen or the fins are clogged, incomplete combustion can be accurately detected and gas It is extremely useful in practical use because it allows safety measures such as stopping the supply of

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

図面はこの考案の一実施例を示す縦断正面図である。 Ａ・・・・・・熱交換器、１・・・・・・内胴、２・・
・・・・酸素濃度センサ、３・・・・・・燃焼室、４・
・・・・・先端密閉部、５・・・・・・基端開口部。The drawing is a longitudinal sectional front view showing an embodiment of this invention. A... Heat exchanger, 1... Inner shell, 2...
...Oxygen concentration sensor, 3...Combustion chamber, 4.
...Tip sealing part, 5...Proximal opening.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 熱交換器Ａを上部に備えた内胴１の適所に試験管状の酸
素濃度センサ２を燃焼室３内にその先端密閉部４を臨ま
せて取付け、該センサ２の基端開口部５は外気中に開放
させたことを特徴とする安全装置付きガス湯沸器。A test tube-shaped oxygen concentration sensor 2 is installed at a suitable location in the inner shell 1 having the heat exchanger A at the top, with its tip sealed portion 4 facing into the combustion chamber 3, and the proximal opening 5 of the sensor 2 is connected to outside air. A gas water heater with a safety device that is characterized by an open interior.