JPH0158417B2 - - Google Patents
Info
- Publication number
- JPH0158417B2 JPH0158417B2 JP22509785A JP22509785A JPH0158417B2 JP H0158417 B2 JPH0158417 B2 JP H0158417B2 JP 22509785 A JP22509785 A JP 22509785A JP 22509785 A JP22509785 A JP 22509785A JP H0158417 B2 JPH0158417 B2 JP H0158417B2
- Authority
- JP
- Japan
- Prior art keywords
- pressure
- combustion
- combustion chamber
- fan
- set 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.)
- Expired
Links
- 238000002485 combustion reaction Methods 0.000 claims description 79
- 238000009423 ventilation Methods 0.000 claims description 23
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 15
- 239000007789 gas Substances 0.000 claims description 13
- 239000000567 combustion gas Substances 0.000 claims description 11
- 230000002159 abnormal effect Effects 0.000 claims description 2
- 239000000446 fuel Substances 0.000 claims description 2
- 238000010438 heat treatment Methods 0.000 claims description 2
- 238000001514 detection method Methods 0.000 description 10
- 230000000694 effects Effects 0.000 description 5
- 238000007664 blowing Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000008236 heating water Substances 0.000 description 2
- 230000004043 responsiveness Effects 0.000 description 2
- 230000003213 activating effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000002441 reversible effect Effects 0.000 description 1
Landscapes
- Regulation And Control Of Combustion (AREA)
- Control Of Combustion (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、水加熱用の熱交換器に燃焼生成物等
が付着することが原因で生じる不完全燃焼等の不
良燃焼の原因となる排気詰りを検出するための手
段を備えた給湯器に関する。具体的には、バーナ
と水加熱用の熱交換器とを備えた燃焼室に燃焼用
空気を供給するフアンを設け、前記燃焼室に、燃
焼室内圧の異常上昇に伴つて燃焼ガスを流出させ
る通気路を接続し、かつ、この通気路を通るガス
の温度を検出する温度センサと、この温度センサ
からの情報に基づいて検出情報が設定値以上にな
ると前記バーナへの燃料供給を停止する遮断弁と
を設けてある給湯器に関する。Detailed Description of the Invention [Industrial Application Field] The present invention is aimed at reducing exhaust gas that causes poor combustion such as incomplete combustion caused by combustion products adhering to a heat exchanger for water heating. The present invention relates to a water heater equipped with means for detecting clogging. Specifically, a fan is provided to supply combustion air to a combustion chamber equipped with a burner and a heat exchanger for heating water, and combustion gas is caused to flow into the combustion chamber as the pressure in the combustion chamber increases abnormally. A temperature sensor that connects the ventilation passage and detects the temperature of gas passing through the ventilation passage, and a shutoff that stops fuel supply to the burner when the detected information exceeds a set value based on information from this temperature sensor. The present invention relates to a water heater equipped with a valve.
一般に、排気詰りに起因した燃焼室内圧の異常
上昇によりその燃焼室に接続する通気路に燃焼ガ
スを流入させ、これによつて温度センサによる検
出対象ガスを燃焼ガスに切換えることで、温度を
パラメータとして排気詰りを検出するに、従来で
は、通気路の圧力を大気圧としていた。
Generally, when the combustion chamber pressure rises abnormally due to exhaust clogging, combustion gas flows into the ventilation passage connected to the combustion chamber, and the temperature is set as a parameter by switching the gas to be detected by the temperature sensor to combustion gas. Conventionally, to detect exhaust clogging, the pressure in the air passage was set to atmospheric pressure.
しかしながら、前記従来によるときは、排気詰
りのない正常燃焼時の燃焼室内圧と大気圧との差
圧の大きさが器具構成により異なつて、前記の差
圧が適切でない場合が多々あり、特に、フアンに
よつて燃焼室に対する給気や排気を強制的に行う
場合は、その傾向が強く、しかも、燃焼室内圧が
大気圧以上になることもある。そして、前記の差
圧が大き過ぎる場合には、排気詰りの発生時に対
して燃焼ガスの通気路への流入時期が大きく遅れ
て排気詰り検出の応答性が悪くなり、差圧が小さ
過ぎる場合には、応答過敏となり、また、燃焼室
内圧が大気圧以上である場合には、正常燃焼時に
も燃焼ガスが通気路に流入して排気詰り検出がで
きないのである。
However, in the conventional method, the magnitude of the pressure difference between the combustion chamber pressure and the atmospheric pressure during normal combustion without exhaust clogging varies depending on the equipment configuration, and the pressure difference is often not appropriate. When air is forcibly supplied to or exhausted from the combustion chamber using a fan, this tendency is strong, and the pressure inside the combustion chamber may exceed atmospheric pressure. If the above-mentioned differential pressure is too large, the timing of combustion gas flowing into the ventilation passage will be significantly delayed compared to when exhaust clogging occurs, resulting in poor responsiveness in detecting exhaust clogging, and if the differential pressure is too small, If the combustion chamber pressure is above atmospheric pressure, combustion gas will flow into the ventilation passage even during normal combustion, making it impossible to detect exhaust clogging.
このように、従来にあつては、温度をパラメー
タとした排気詰り検出が正常燃焼時の燃焼室内圧
による影響を受け、その排気詰り検出を良好、か
つ、正確に行えないことがあつた。 As described above, in the past, exhaust gas clogging detection using temperature as a parameter was affected by the combustion chamber pressure during normal combustion, and the exhaust gas clogging could not be detected satisfactorily and accurately.
本発明の目的は、燃焼のためのフアンの作用を
利用することによつて、正常燃焼時の燃焼室内圧
の大きさにかかわらず、排気詰り検出を良好、か
つ、確実に行えるようにする点にある。 An object of the present invention is to use the action of a fan for combustion to successfully and reliably detect exhaust clogging regardless of the pressure in the combustion chamber during normal combustion. It is in.
本発明による給湯器の特徴構成は、前記通気路
の圧力を正常燃焼時の燃焼室内圧に近い設定値に
前記フアンの作用で維持する導圧路を設けてある
点にある。そして、それによる作用・効果は次の
通りである。
The water heater according to the present invention is characterized in that it is provided with a pressure guiding path that maintains the pressure in the ventilation path at a set value close to the combustion chamber pressure during normal combustion by the action of the fan. The effects and effects thereof are as follows.
導圧路によつて、例えば、フアンを排気フアン
としたこと等が原因で正常燃焼時の燃焼室内圧が
大気圧よりも低い（つまり負圧である）場合に
は、前記フアンによる吸引作用で、また、フアン
を給気フアンとしたこと等が原因で正常燃焼時の
燃焼室内圧が大気圧よりも高い（つまり正圧であ
る）場合には、前記フアンによる吹込作用で、そ
れぞれ、通気路の圧力を、燃焼室内圧よりも高
く、かつ、燃焼室内圧に近い設定値に維持するよ
うにしてあるため、排気詰りのない正常燃焼時の
燃焼室内圧が負圧、正圧のいずれの場合であつて
も、また、どのような値であつても、導圧路によ
つて、前記通気路の圧力を、不完全燃焼等の不良
燃焼の原因となる排気詰りが生じたときの燃焼室
内圧に設定することができる。これによつて、正
常燃焼時には、通気路に導圧路からの低温のガス
（外気やフアンにより吹込まれる大気）を流入さ
せて温度センサの検出情報を設定値未満に確実に
維持し、排気詰りが生じた場合には、直ちに、通
気路に燃焼ガスを流入させて温度センサの検出情
報を設定値以上にすることができる。しかも、前
記のように燃焼のためのフアンの作用を利用して
通気路の圧力を設定値に維持するため、通気路の
圧力を設定値に維持するための特別なフアンが不
要で、導圧路を設けるだけで良い。
If the pressure in the combustion chamber during normal combustion is lower than atmospheric pressure (that is, negative pressure) due to the use of a fan as an exhaust fan, for example, due to the suction effect of the fan, In addition, if the combustion chamber pressure during normal combustion is higher than atmospheric pressure (that is, positive pressure) due to the use of a fan as an air supply fan, the blowing action of the fan will cause the air passage to The pressure in the combustion chamber is maintained at a set value higher than and close to the combustion chamber pressure, so whether the combustion chamber pressure is negative or positive during normal combustion without exhaust clogging. Regardless of the value, the pressure in the ventilation path can be adjusted by the pressure path to the pressure in the combustion chamber in the event of exhaust clogging that causes poor combustion such as incomplete combustion. pressure can be set. As a result, during normal combustion, low-temperature gas (outside air or air blown in by a fan) from the pressure path flows into the ventilation path to ensure that the temperature sensor's detection information is maintained below the set value, and the exhaust gas is If a blockage occurs, combustion gas can be immediately flowed into the ventilation passage to make the detection information of the temperature sensor equal to or higher than the set value. Moreover, as mentioned above, the pressure in the air passage is maintained at the set value using the action of the combustion fan, so there is no need for a special fan to maintain the pressure in the air passage at the set value, and the pressure is All you have to do is create a path.
したがつて、本発明は、正常燃焼時にはその正
常燃焼を確実に行うことができ、かつ、正常燃焼
時における燃焼室内圧の大きさにかかわらず、不
完全燃焼等の不良燃焼の原因となる排気詰りの検
出を応答性良く確実に、かつ、良好に行え、しか
も、構造簡単、かつ、安価に実施できる給湯器を
提供できた。
Therefore, the present invention can reliably perform normal combustion during normal combustion, and eliminates the exhaust gas that causes incomplete combustion and other poor combustion regardless of the pressure in the combustion chamber during normal combustion. It has been possible to provide a water heater that can detect clogging with good responsiveness, reliably, and satisfactorily, has a simple structure, and can be implemented at low cost.
以下、本発明の実施例を図面に基づいて説明す
る。
Embodiments of the present invention will be described below based on the drawings.
第１実施例
給湯器は、第１図に示すように、ガスバーナ１
と水加熱用の熱交換器２とを備えた燃焼室３に燃
焼用空気を供給する給気フアン４を設け、前記ガ
スバーナ１への燃料ガス供給路５を開閉する電磁
弁６と、燃料ガス供給量を制御する比例弁７と、
点火プラグ８と、各種のセンサと、制御器９とを
設けて、構成されている。1st Example As shown in FIG. 1, the water heater has a gas burner 1
An air supply fan 4 is provided for supplying combustion air to a combustion chamber 3 having a heat exchanger 2 for heating water. a proportional valve 7 that controls the supply amount;
It is configured by providing a spark plug 8, various sensors, and a controller 9.
前記センサは、出湯の有無を検出するフローセ
ンサ１０、出湯温を検出する出湯温サーミスタ１
１、給気フアン４による送風圧を検出する圧力セ
ンサ１２、燃焼炎の有無を検出するフレームロツ
ド利用の燃焼炎センサ１３、温度センサとしての
サーミスタ１４である。 The sensors include a flow sensor 10 that detects the presence or absence of hot water, and a hot water temperature thermistor 1 that detects the temperature of hot water.
1, a pressure sensor 12 that detects the pressure of air blown by the air supply fan 4, a combustion flame sensor 13 using a flame rod that detects the presence or absence of combustion flame, and a thermistor 14 as a temperature sensor.
前記サーミスタ１４は、前記燃焼室３にそれに
形成の孔３ａを介して接続させたＬ字形の通気路
１５を通るガスの温度を検出するものであつて、
前記通気路１５は、燃焼室内圧の異常上昇に伴つ
て燃焼ガスを流出させるものである。 The thermistor 14 detects the temperature of gas passing through an L-shaped ventilation passage 15 connected to the combustion chamber 3 through a hole 3a formed therein.
The ventilation passage 15 is for allowing combustion gas to flow out in response to an abnormal rise in the internal pressure of the combustion chamber.
前記制御器９は次に列記する手段を有する。 The controller 9 has the following means.
〔1〕 前記フローセンサ１０からの有検出情報に
基づいて、前記給気フアン４を可逆的に作動さ
せ、その後、圧力センサ１２の検出情報に基づ
いて、検出情報が設定値以上になると、可逆的
に前記電磁弁６を開くとともに、点火プラグ８
を作動させる点火・消火手段。[1] Based on the presence detection information from the flow sensor 10, the air supply fan 4 is reversibly operated, and then, based on the detection information of the pressure sensor 12, when the detection information exceeds a set value, the reversible operation is performed. At the same time, the solenoid valve 6 is opened, and the spark plug 8 is opened.
ignition/extinguishing means for activating.
〔2〕 前記出湯温サーミスタ１１からの検出情報
に基づいて、ガス供給量が出湯温を目標値とさ
せる燃焼量に相当する値となるように前記比例
弁７を作動させる湯温制御手段。[2] Hot water temperature control means that operates the proportional valve 7 based on the detection information from the hot water temperature thermistor 11 so that the gas supply amount becomes a value corresponding to the combustion amount that makes the hot water temperature reach the target value.
〔3〕 点火操作後の前記燃焼炎センサ１３の無検
出情報に基づいて、前記電磁弁６を閉じる不測
消火用の燃焼停止手段。[3] Combustion stop means for unexpected fire extinguishing that closes the solenoid valve 6 based on non-detection information from the combustion flame sensor 13 after the ignition operation.
〔4〕 前記サーミスタ１４からの検出情報に基づ
いて、検出情報が設定値以上になると前記電磁
弁６を遮断弁として閉じる不完全燃焼防止用の
燃焼停止手段。なお、設定値は、燃焼ガスの温
度よりも低い温度である。[4] Combustion stop means for preventing incomplete combustion, which closes the solenoid valve 6 as a cutoff valve when the detected information from the thermistor 14 exceeds a set value. Note that the set value is a temperature lower than the temperature of the combustion gas.
かつ、前記通気路１５の屈折部と前記給気フア
ン４の出口との間には、燃焼時において通気路１
５の圧力を給気フアン４による吹込作用で正常燃
焼時の燃焼室内圧P1に近く、かつ、やや高い設
定値、具体的には、不完全燃焼の原因となる排気
詰りが発生したときの燃焼室内圧P1に等しい設
定値に維持する導圧路１６が介装されている。前
記の設定値は、導圧路１６および通気路１５の遊
端部に設けたオリフイス１７，１８によつて設定
されている。因に、ガスバーナ１での圧損を
ΔP1、熱交換器２での圧損をΔP2、導圧路１６で
の圧損をΔP3、通気路１５における遊端部での圧
損をΔP4、給気フアン１４の出口圧をＰとし、か
つ、強制燃焼の圧力損失は燃焼室３内のドラフト
と比べて非常に大きくて、ドラフトによる圧力の
影響は無視するものとすると、燃焼室内圧P1は、
Ｐ−ΔP1でΔP2に等しく、通気路１５の圧力P2
は、Ｐ−ΔP3でΔP4に等しい。そして、Ｐ、ΔP1、
ΔP2は決まつているため、オリフイス１７，１８
の調節によつて、通気路内圧P2を前記の設定値
に容易に設定することができるのである。 Also, between the bent part of the ventilation passage 15 and the outlet of the air supply fan 4, the ventilation passage 1 is formed during combustion.
The pressure of 5 is set close to the combustion chamber pressure P 1 during normal combustion by the blowing action of the air supply fan 4, and a slightly higher set value, specifically, when exhaust clogging occurs that causes incomplete combustion. A pressure channel 16 is provided which maintains the combustion chamber pressure at a set value equal to P 1 . The above set values are set by orifices 17 and 18 provided at the free ends of the pressure guiding path 16 and the ventilation path 15. Incidentally, the pressure loss in the gas burner 1 is ΔP 1 , the pressure loss in the heat exchanger 2 is ΔP 2 , the pressure loss in the pressure guide path 16 is ΔP 3 , the pressure loss at the free end of the ventilation path 15 is ΔP 4 , and the pressure loss in the air supply path 15 is ΔP 4 . Assuming that the outlet pressure of the fan 14 is P, and the pressure loss due to forced combustion is much larger than the draft in the combustion chamber 3, and the influence of pressure due to the draft is ignored, the combustion chamber pressure P 1 is:
P - ΔP 1 equals ΔP 2 and the pressure in the air passage 15 P 2
is P-ΔP 3 equal to ΔP 4 . And P, ΔP 1 ,
Since ΔP 2 is fixed, orifices 17 and 18
By adjusting the above, the air passage internal pressure P2 can be easily set to the above set value.
上記の構成によれば、正常燃焼時においては、
燃焼室内圧P1は正圧で、通気路１５の圧力P2は
設定値であつて、P1＜P2であるため、給気フア
ン４から導圧路１６を介して送られてくる燃焼用
空気（外気）が通気路１５に流入する。その結
果、サーミスタ１４による検出情報は設定値以上
とならず、電磁弁６が開状態に保持され、その正
常燃焼が継続して行われる。他方、熱交換器２で
の排気詰りが発生したときには、その排気詰りに
よつて燃焼室内圧P1が通気路１５の圧力P2より
も上昇して燃焼ガスが通気路１５に流入し、サー
ミスタ１４の検出情報が設定値以上となつて電磁
弁６が閉じ、燃焼が自動停止して、排気詰りによ
る不完全燃焼が防止される。 According to the above configuration, during normal combustion,
The pressure P 1 in the combustion chamber is a positive pressure, and the pressure P 2 in the air passage 15 is a set value, and P 1 < P 2 , so the combustion air sent from the air supply fan 4 through the pressure passage 16 Air for use (outside air) flows into the ventilation path 15. As a result, the information detected by the thermistor 14 does not exceed the set value, the solenoid valve 6 is kept open, and normal combustion continues. On the other hand, when exhaust clogging occurs in the heat exchanger 2, the combustion chamber pressure P1 rises higher than the pressure P2 in the ventilation passage 15 due to the exhaust clogging, and combustion gas flows into the ventilation passage 15, causing the thermistor When the detection information 14 exceeds a set value, the solenoid valve 6 closes, combustion is automatically stopped, and incomplete combustion due to exhaust clogging is prevented.
第２実施例
前記第１実施例において、図中二点鎖線で示す
ように、通気路１５の遊端を排気チヤンバー１９
内に連通させる。この場合、風等による熱交換器
２よりも下流側での一過的な排気抵抗の変動に応
じて通気路１５内の圧力P2が、燃焼室内圧P1と
同様に、排気抵抗が大きくなれば上昇するといつ
た具合に変化するため、排気抵抗が一時的に大き
くなつて、燃焼室内圧力P1が上昇しても、燃焼
ガスの通気路１５への流入がなく、不測の消火が
防止される。Second Embodiment In the first embodiment, the free end of the ventilation passage 15 is connected to the exhaust chamber 19 as shown by the two-dot chain line in the figure.
communicate within. In this case, the pressure P 2 in the ventilation passage 15 increases due to a temporary fluctuation in exhaust resistance downstream of the heat exchanger 2 due to wind, etc., and the exhaust resistance increases as well as the pressure P 1 in the combustion chamber. As the pressure rises, the condition changes accordingly, so even if the exhaust resistance temporarily increases and the combustion chamber pressure P1 rises, the combustion gas will not flow into the ventilation passage 15, preventing accidental extinguishing. be done.
第３実施例
第２図に示すように、前述第１実施例におい
て、フアン４を排気フアンとし、この排気フアン
４による吸引作用で通気路１５の圧力P2を前述
した設定値に維持する導圧路１６を排気フアン４
の入口と通気路１５の屈折部との間に亘つて、設
けたものである。この場合、正常燃焼時の燃焼室
内圧P1および通気路１５の圧力P2はともに負圧
である。なお、他の構造は第１実施例と同じであ
るため、同一符号を付すことによつて、それらの
証明は省略する。Third Embodiment As shown in FIG. 2, in the first embodiment, the fan 4 is used as an exhaust fan, and the suction action of the exhaust fan 4 is used to maintain the pressure P 2 in the air passage 15 at the set value described above. Exhaust fan 4 exhausts pressure path 16
It is provided between the entrance of the air passage 15 and the bent part of the air passage 15. In this case, during normal combustion, the combustion chamber pressure P 1 and the pressure P 2 of the air passage 15 are both negative pressures. Note that since the other structures are the same as those in the first embodiment, the proof thereof will be omitted by giving the same reference numerals.
第４実施例
前述第１実施例では、サーミスタ１４からの検
出情報に基づいて作動する遮断弁６を、通常の燃
焼制御に用いられる電磁弁をもつて兼用させた
が、専用の遮断弁６を設けて実施しても良いこと
はいうまでもない。Fourth Embodiment In the first embodiment described above, the solenoid valve used for normal combustion control was also used as the cutoff valve 6 that operates based on the detection information from the thermistor 14. It goes without saying that it may be established and implemented.
なお、温度センサ１４としては、サーミスタの
他、熱電対、バイメタル、光学的に温度を検出す
るもの、ダイオードの順方向電圧の変化を利用し
て温度を検出するもの等、各種のものを挙げるこ
とができる。 In addition to the thermistor, the temperature sensor 14 may include various types such as a thermocouple, a bimetal, a sensor that detects temperature optically, and a sensor that detects temperature using a change in the forward voltage of a diode. Can be done.
図面は本発明に係る給湯器の実施例を示し、第
１図は第１実施例を示す概略構成図、第２図は第
３実施例を示す概略構成図である。
１……バーナ、２……熱交換器、３……燃焼
室、４……フアン、１５……通気路、１４……温
度センサ、６……遮断弁、１６……導圧路。
The drawings show embodiments of the water heater according to the present invention, with FIG. 1 being a schematic diagram showing the first embodiment, and FIG. 2 being a schematic diagram showing the third embodiment. 1...Burner, 2...Heat exchanger, 3...Combustion chamber, 4...Fan, 15...Air passage, 14...Temperature sensor, 6...Shutoff valve, 16...Pressure passage.
Claims (1)
燃焼室３に燃焼用空気を供給するフアン４を設
け、前記燃焼室３に、燃焼室内圧の異常上昇に伴
つて燃焼ガスを流出させる通気路１５を接続し、
かつ、この通気路１５を通るガスの温度を検出す
る温度センサ１４と、この温度センサ１４からの
情報に基づいて検出情報が設定値以上になると前
記バーナ１への燃料供給を停止する遮断弁６とを
設けてある給湯器であつて、前記通気路１５の圧
力を正常燃焼時の燃焼室内圧に近い設定値に前記
フアン４の作用で維持する導圧路１６を設けてあ
る給湯器。1. A fan 4 is provided to supply combustion air to a combustion chamber 3 equipped with a burner 1 and a heat exchanger 2 for water heating, and combustion gas flows out into the combustion chamber 3 due to an abnormal increase in pressure within the combustion chamber. Connect the ventilation path 15 to
A temperature sensor 14 detects the temperature of the gas passing through the air passage 15, and a cutoff valve 6 stops fuel supply to the burner 1 when the detected information exceeds a set value based on the information from the temperature sensor 14. The water heater is equipped with a pressure guiding path 16 for maintaining the pressure in the ventilation path 15 at a set value close to the combustion chamber pressure during normal combustion by the action of the fan 4.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22509785A JPS6284224A (en) | 1985-10-09 | 1985-10-09 | Hot water heater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22509785A JPS6284224A (en) | 1985-10-09 | 1985-10-09 | Hot water heater |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6284224A JPS6284224A (en) | 1987-04-17 |
| JPH0158417B2 true JPH0158417B2 (en) | 1989-12-12 |
Family
ID=16823937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22509785A Granted JPS6284224A (en) | 1985-10-09 | 1985-10-09 | Hot water heater |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6284224A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012097932A (en) * | 2010-10-29 | 2012-05-24 | Rinnai Corp | Water heater |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB0002263D0 (en) * | 2000-02-02 | 2000-03-22 | Smiths Industries Plc | Gas appliances and control systems |
-
1985
- 1985-10-09 JP JP22509785A patent/JPS6284224A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2012097932A (en) * | 2010-10-29 | 2012-05-24 | Rinnai Corp | Water heater |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6284224A (en) | 1987-04-17 |
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