JP3845546B2 - Operation control method of vaporization type combustion apparatus - Google Patents

Description

【００５７】
これらの第１〜第３閾値温度T1，T2，T3は、気化器温度センサ３６の検出温度に対する閾値であり、第１閾値温度T1は、後述のように燃焼ファン４３の作動を開始するタイミングを規定する閾値温度である。また、第２閾値温度T2は後述のように種火バーナ４の燃焼を開始するタイミングを規定する閾値温度であり、第３閾値温度T3は、後述のようにメインバーナ３の燃焼を開始するタイミングを規定する閾値温度である。
【００５８】
この場合、第１〜第３閾値温度T1，T2，T3の設定種別は、大別すると、初期雰囲気温度TS0が例えば５℃以下である場合（低温環境下で温風暖房装置の運転を行う場合）と、初期雰囲気温度TSが５℃よりも高い場合（通常的な温度環境下で温風暖房装置の運転を行う場合）とで分類され、さらに、後者の場合については、気化器初期温度TK0が例えば１００℃以下である場合と気化器初期温度TK0が１００℃よりも高い場合とで分類されている。ここで、気化器初期温度TK0が、TK0＞１００℃となる場合は、基本的には温風暖房装置の運転停止後、比較的短い時間の経過後に温風暖房装置の運転が再開される場合（気化器６が未だ比較的高温状態になっている場合）である。また、TK0≦１００℃となる場合は、基本的には、前回の温風暖房装置の運転を停止してから十分に時間が経過した後に温風暖房装置の運転が行われる場合で、別の言い方をすれば、気化器６の温度が初期雰囲気温度TS0と大差のない温度になっている場合である。
【００５９】
そして、本実施形態では、TS0≦５℃の場合における第１閾値温度T1（１０℃）は、TS0＞５℃の場合の第１閾値温度T1（１３０℃又は１５０℃）よりも十分に小さな値に設定されている。また、TS0≦５℃の場合における第２閾値温度T2（１９０℃）及び第３閾値温度T3（２４０℃）は、それぞれ、TS0＞５℃の場合の第２閾値温度T2（１６０℃又は１８０℃）、第３閾値温度T3（２２０℃）よりも大きな値に設定されている。
【００６０】
また、TS0＞５℃の場合においては、電熱ヒータ３５により後述のように加熱される気化器６の本体部３１の、燃料噴射ノズル３９から噴射される液体燃料が接触する部分（図１の参照符号３１ａを付した部分。以下、燃料供給部分３１ａという）の実際の温度に対する気化器温度センサ３６の検出温度（気化器温度センサ３６が取付けられた部分の温度）の時間的な遅れが生じ、また、その時間的な遅れの程度が気化器初期温度TK0に応じて相違することを考慮して第１〜第３閾値温度T1〜T3が設定されている。すなわち、前記電熱ヒータ３５による気化器６の後述の加熱開始後に、気化器温度センサ３６の検出温度が、第１〜第３の各閾値温度T1〜T3に到達した時における前記燃料供給部分３１ａの実際の温度がTK0≦１００℃の場合と、TK0＞１００℃の場合とで、ほぼ同一の温度になるように第１〜第３閾値温度T1〜T3が実験等に基づいて設定されている。この場合、基本的には、気化器初期温度TK0が低い方が、高い場合よりも、気化器６の燃料供給部分３１ａの実際の温度に対する気化器温度センサ３６の検出温度の時間的な遅れが長くなり、また、その時間的な遅れの気化器初期温度TK0に応じた差は、気化器６の本体部３１の電熱ヒータ３５による加熱が進行するに伴って小さくなるので、第１〜第３の各閾値温度T1〜T3は、TK0≦１００℃の場合の値が、TK0＞１００℃の場合の値よりも小さいか（第１及び第２閾値温度T1，T2）、もしくは同等の値（第３閾値温度T3）に設定されている。
【００６１】
尚、TS0＞５℃の場合における第１〜第３の各閾値温度T1〜T3に対応する気化器６の燃料供給部分３１ａの実際の温度は、それぞれ例えば約１７０℃、２００℃、２４０℃である。また、TS0≦５℃の場合における第１〜第３の各閾値温度T1〜T3に対応する気化器６の燃料供給部分３１ａの実際の温度は、それぞれ例えば約５０℃、２４０℃、２６０℃である。また、いずれの場合であっても、第２閾値温度T2及び第３閾値温度T3は、それぞれに対応する燃料供給部分３１ａの実際の温度が、後述のように種火バーナ４、メインバーナ３の燃焼運転が開始される際に気化器６に供給される液体燃料を気化し得る温度になるように設定された閾値温度である。
【００６２】
上述のようにして、第１〜第３閾値T1〜T3を設定した後、制御装置４７は、さらに、弁装置２４の電動モータ２７を制御して、前記混合気分配部１２内の弁体２５をメイン側貫通穴１７に向かって移動させ、該メイン側貫通穴１７の凸部１６に着座させる（ＳＴＥＰ３）。これにより、メインバーナ３のメイン側混合気通路１０を混合気分配部１２から遮断すると共に、該混合気分配部１２を種火側貫通穴１５を介して種火バーナ４の種火側混合気通路１１のみに開放する。さらに、このＳＴＥＰ３では、制御装置４７は、前記電熱ヒータ３５に通電し、気化器６の本体部３１の加熱を開始する。尚、ＳＴＥＰ１〜３の処理はほぼ同時に行われる。
【００６３】
このようにして、電熱ヒータ３５の通電（気化器６の加熱）を開始した後、制御装置４７は、気化器温度センサ３６の検出温度（以下、これに参照符号TKを付する）を逐次監視し、該検出温度TKが前記ＳＴＥＰ２で設定した第１閾値温度T1まで上昇したか否かを判断する（ＳＴＥＰ４）。
【００６４】
このとき、気化器温度センサ３６の検出温度TKがTK≧T1になると、制御装置４７は、燃焼ファン４３のファンモータ４３ａを制御して、該燃焼ファン４３の作動を開始し、該燃焼ファン４３を所定回転数で回転させる（ＳＴＥＰ５）。このとき、該燃焼ファン４３から送風される空気は、バーナケース１内の前記空気通路４５、メイン混合気通路３３、混合気分配部１２、種火側混合気通路１１、種火炎口１９を介して燃焼室２１に流れ、これにより該燃焼室２１等の掃気が行われる。
【００６５】
また、このとき、気化器６内のメイン混合気通路３３を流れる空気が、電熱ヒータ３５により加熱されている気化器６の本体部３１の熱を受けることで暖められる。そして、その暖められた空気が混合気分配部１２及び種火側混合気通路１１を流れることで、これらの混合気分配部１２及び種火側混合気通路１１を内部に有する種火バーナヘッド８も加温されて暖められる。特に、前記初期雰囲気温度TS0がTS0≦５℃である場合（低温環境下での温風暖房装置の運転の場合）においては、前記第１閾値温度T1が低い値（１０℃）に設定されているため、燃焼ファン４３の作動、ひいては種火バーナヘッド８の加温が比較的早期に開始される。
【００６６】
尚、TS0＞５℃である場合（通常的な温度環境下での温風暖房装置の運転の場合）には、気化器温度センサ３６の検出温度TKが、TK0≦１００℃の場合と、TK0＞１００℃の場合とで、互いに異なる温度（１３０℃、１５０℃）に達したときに燃焼ファン４３の作動が開始される。但し、前述した気化器温度センサ３６の検出温度TKの時間的な遅れによって、TK0≦１００℃の場合と、TK0＞１００℃の場合とのいずれの場合であっても、燃焼ファン４３の作動が開始される際における気化器６の本体部３１の燃料供給部分３１ａの実際の温度は概ね同一の温度（約１７０℃）である。
【００６７】
このように燃焼ファン４３の作動を開始した後、制御装置４７は、次に、気化器温度センサ３６の検出温度TKが前記ＳＴＥＰ２で設定した第２閾値温度T2まで上昇したか否かを判断する（ＳＴＥＰ６）。
【００６８】
このとき、電熱ヒータ３５による気化器６の本体部３１の加熱によって、該本体部３１の温度がさらに上昇し、気化器温度センサ３６の検出温度TKがTK≧T2になると、制御装置４７は、種火バーナ４の点火処理を実行して、該種火バーナ４の燃焼運転を開始させる（ＳＴＥＰ７）。
【００６９】
この種火バーナ４の点火処理では、制御装置４７は、燃焼ファン４３の作動を継続したまま、イグナイタ５１を作動させて点火電極５０に火花放電を発生させる。さらに、制御装置４７は、電磁ポンプ４１を制御して、該電磁ポンプ４１による定油面器２の灯油の吐出量（＝燃料噴射ノズル３９への灯油の供給量）を所定量に制御し、その所定の吐出量の灯油を燃料噴射ノズル３９に供給せしめる。
【００７０】
このとき、燃料噴射ノズル３９に供給される灯油は、気化器６内のメイン混合気通路３３内で気化器６の本体部３１の燃料供給部分３１ａに向かって燃料噴射ノズル３９から噴射され、該本体部３１の燃料供給部分３１ａの熱により気化される。さらにこのとき、その気化した気化ガスは、気化器６の空気導入口３８からメイン混合気通路３３内に導入される空気（一次空気）と混合して混合気となり、その混合気がメイン混合気通路３３から、種火バーナヘッド８内の混合気分配部１２、種火側貫通穴１５、種火側混合気通路１１、及び種火炎口１９を介して燃焼室２１内に噴出する。そして、その噴出した混合気が点火電極５０の火花放電により点火され、種火バーナ４の燃焼が開始する。
【００７１】
この場合、種火バーナヘッド８や、その内部の混合気分配部１２及び種火側混合気通路１１は、種火バーナ４の点火処理に先行する燃焼ファン４３の作動（ＳＴＥＰ５）によって、前述のように暖められている。このため、気化器６内のメイン混合気通路３３で生成される液体燃料の気化ガスが種火バーナヘッド８内を通って種火炎口１９に流れる過程で該気化ガスが放出する熱が少ないものとなって、該気化ガスの結露を回避しつつ該気化ガスを種火炎口１９に供給して燃焼させることができる。
【００７２】
特に、初期雰囲気温度TS0がTS0≦５℃である低温環境下での運転、換言すれば、気化ガスの結露を生じやすい運転環境下においては、早期に燃焼ファン４３の作動が開始されていると共に、種火バーナ４の燃焼開始のタイミングを規定する第２閾値温度T2は、通常的な温度環境下での運転の場合よりも高い。このため、低温環境下での運転の場合には、種火バーナ４の燃焼運転の開始の際に、通常的な場合よりも種火バーナヘッド８が十分に暖められており、気化器６内で生成された気化ガスが種火炎口１９に流れる過程で該気化ガスから放出される熱が少ないものとなる。また、種火バーナ４の燃焼運転の開始の際の気化器６の本体部３１の温度が比較的高い温度になっていることで、燃料噴射ノズル３９から噴射される液体燃料は十分な熱を気化器６の本体部３１から吸収して気化することができる。この結果、気化ガスの結露を生じやすい低温環境下での運転においても、気化器６内で生成された気化ガスが種火炎口１９に流れる過程で結露を生じることなく、種火炎口１９に供給されて燃焼する。
【００７３】
また、通常的な温度環境下での運転においては、気化器温度センサ３６の検出温度TKが第２閾値温度T2に到達したとき（種火バーナ４の燃焼を開始する際）における気化器６の本体部３１の燃料供給部分３１ａの温度は、気化器初期温度TK0によらずにほぼ一定の温度（約２００℃）である。さらに、先にも述べたように、種火バーナ４の燃焼開始前に燃焼ファン４３の作動を開始したとき（TK≧T1となったとき）における気化器６の本体部３１の燃料供給部分３１ａの温度も、気化器初期温度TK0によらずにほぼ一定の温度である。
【００７４】
このため、種火バーナ４の燃焼を開始するための種火バーナヘッド８の加温と気化器６の予熱を必要限の時間で過不足なく行うことができる。
【００７５】
尚、種火バーナ４の燃焼が開始すると、種火炎口１９から立ち上がる燃焼炎Ｆ4によって気化器６の本体部３１が前記受熱フィン３７を介して加熱される（熱がフィードバックされる）。従って、気化器６の本体部３１は、種火バーナ４の燃焼開始直後は、基本的には電熱ヒータ３５の熱と種火バーナ４の燃焼熱によって加熱される。
【００７６】
このようにして種火バーナ４の燃焼が開始し、該種火バーナ４の燃焼炎Ｆ4が炎検知器４８により検知されてから一定時間（例えば５秒）が経過して種火バーナ４の燃焼が安定すると、制御装置４７は、イグナイタ５１の作動を停止すると共に、前記対流ファン５２の作動を開始し、種火バーナ４の燃焼熱による温風の室内への送風を開始する（ＳＴＥＰ８）。このときの対流ファン５２の回転数は、例えば所定の最小回転数に制御される。
【００７７】
さらに、制御装置４７は、気化器温度センサ３６の検出温度TKを監視し、該検出温度TKが前記ＳＴＥＰ２で設定した第３閾値温度T3まで上昇したか否かを判断する（ＳＴＥＰ９）。
【００７８】
このとき、気化器温度センサ３６の検出温度TKがTK≧T3になると、制御装置４７は、種火バーナ４の燃焼と合わせてメインバーナ３の燃焼を開始する処理を実行する（ＳＴＥＰ１０）。このメインバーナ３の燃焼開始処理では、制御装置４７は、あらかじめ定めた所定量の灯油を燃料噴射ノズル３９に供給するように電磁ポンプ４１の吐出量を制御すると共に、この灯油の供給量に合わせた量の空気をメインバーナ３及び種火バーナ４に供給するように燃焼ファン４３の回転数をあらかじめ定めた所定回転数に制御する。さらに、制御装置４７は、弁装置２４の電動モータ２７を制御して、弁体２５を、前記種火側貫通穴１５とメイン側貫通穴１７との間の所定位置に移動させ、混合気分配部１２をメイン側混合気通路１０と種火側混合気通路１１との両者に開放する。尚、このときの弁体２５の移動位置は、種火側貫通孔１５寄りの位置である。
【００７９】
これにより、気化器６内のメイン混合気通路３３で、灯油の気化ガスと空気（一次空気）との混合気が生成されつつ、その混合気の一部が混合気分配部１２から種火側混合気通路１１を介して種火炎口１９に供給されて種火バーナ４の燃焼が継続すると共に、気化器６で生成された混合気の残部が混合気分配部１２からメイン側混合気通路１０を介してメイン炎口１８に供給され、該炎口１８から噴出する。そして、このメイン炎口１８から噴出する混合気に種火バーナ４の燃焼炎Ｆ4が火移りして、メインバーナ３が点火され、該メインバーナ３及び種火バーナ４を合わせたバーナユニット５の全体の燃焼運転が開始する。また、対流ファン５２の継続的な作動によって、メインバーナ３及び種火バーナ４の燃焼熱による温風の室内への送風がなされる。
【００８０】
この場合、メインバーナ３の燃焼開始前に、種火バーナヘッド８は、既に開始されている種火バーナ４の燃焼によって加熱されており、また、メインバーナヘッド７は、その内部のメイン側混合気通路１０を併せて種火バーナヘッド８の熱やバーナトップ９の熱により暖められている。このため、気化器６内のメイン混合気通路３３で生成される液体燃料の気化ガスのうち、種火バーナヘッド８内を通って種火炎口１９に流れる気化ガスはもちろんのこと、該種火バーナヘッド８の混合気分配部１２からメインバーナヘッド７内のメイン側混合気通路１０を通ってメイン炎口１８に流れる気化ガスについても、該気化ガスの流動過程で該気化ガスが放出する熱が少ないものとなる。従って、該気化ガスの結露を回避しつつ該気化ガスをメイン炎口１８に供給して燃焼させることができる。
【００８１】
特に、気化ガスの結露を生じやすい低温環境下での運転（TS0≦５℃である場合の運転）においては、メインバーナ３の燃焼開始のタイミングを規定する第３閾値温度T3は、通常的な温度環境下での運転の場合よりも高いため、メインバーナ４の燃焼運転の開始前に、通常的な場合よりもメインバーナヘッド８が十分に暖められるとともに、メインバーナ３の燃焼の開始の際に燃料噴射ノズル３９から噴射される液体燃料は十分な熱を気化器６の本体部３１から吸収して気化することができる。この結果、種火バーナ４の燃焼開始の際と同様、気化ガスの結露を生じやすい低温環境下での運転においても、気化器６内で生成された気化ガスがメイン炎口１８及び種火炎口１９に流れる過程で結露を生じることなく、これらの炎口１８，１９に供給されて燃焼する。
【００８２】
また、通常的な温度環境下での運転においては、気化器温度センサ３６の検出温度TKが第３閾値温度T3に到達したとき（メインバーナ３の燃焼を開始する際）における気化器６の本体部３１の燃料供給部分３１ａの温度は、気化器初期温度TK0によらずにほぼ一定の温度（約２４０℃）である。
【００８３】
このため、種火バーナ４の燃焼と合わせてメインバーナ３の燃焼を開始するためのメインバーナヘッド７の加温と気化器６の予熱を必要限の時間で過不足なく行うことができる。
【００８４】
尚、気化器６の電熱ヒータ３５の作動に関し、気化器温度センサ３６の検出温度TKが例えば２２０℃（これは本実施形態ではTS0＞５℃の場合の第３閾値温度T3に等しい）以上に上昇した後には、制御装置４７は、気化器６の本体部３１の温度が、例えば２２０〜２４０℃のほぼ一定の温度に保たれるように電熱ヒータ３５の通電をON／OFFする。
【００８５】
上述のようにして、メインバーナ３の燃焼を開始した後には、制御装置４７は、対流ファン５２の作動による温風の送風及び室内空気の対流を行いながら、室温センサ４９により検出される室温とあらかじめ使用者により設定される目標室温とに応じて燃焼ファン４３の回転数、電磁ポンプ４１の灯油の吐出量、対流ファン５５の回転数を制御し、室温を目標室温に大略維持するように温風暖房装置の温調運転を行う（ＳＴＥＰ１１）。この場合、基本的には、室温センサ４９による検出室温が目標室温よりも低い程、燃焼ファン４３の回転数、電磁ポンプ４１の灯油の吐出量を大きくして、バーナユニット５の燃焼量を増加させると共に、対流ファン５２の回転数を大きくして、温風の送風量を多くする。また、室温センサ４９による検出室温が目標室温に近づくと、燃焼ファン４３の回転数、電磁ポンプ４１の吐出量を小さくして、バーナユニット５の燃焼量を減少させると共に、対流ファン５２の回転数を小さくして、温風の送風量を少なくする。
【００８６】
尚、本発明の本質をなすものではないのでここでは簡略な説明に留めるが、本実施形態では、燃焼ファン４３による燃焼用空気の給気温度（具体的には例えば燃焼ファン４３の吸気口における空気温度等）を図示を省略する給気温度センサにより検出するようにしている。そして、前記ＳＴＥＰ８からＳＴＥＰ９にかけての種火バーナ４の燃焼中や、前記ＳＴＥＰ１１の温調運転における種火バーナ４及びメインバーナ３の燃焼中における燃焼ファン４３の回転数の制御（燃焼用空気の送風量の制御）においては、常温程度の所定の給気温度（例えば２０℃）の環境下で種火バーナ４やメインバーナ３の良好な燃焼状態が確保されるようにバーナユニット５の全体の燃焼量あるいは気化器６への液体燃料の供給量に対してあらかじめ定めた燃焼ファン４３の回転数を基本回転数とし、この基本回転数を上記給気温度センサの検出温度に応じて適宜補正することで、該燃焼ファン４３の目標回転数を決定して、該燃焼ファン４３の回転数を制御するようにしている。この補正は、バーナユニット５に供給される燃焼用空気の密度（ひいては該空気の単位体積当りの酸素量）が給気温度に応じて変化し、また、バーナユニット５における気化ガスの燃焼速度（燃焼反応の生じ易さ）が該給気温度に応じて変化することを考慮したものである。そして、燃焼ファン４３の回転数の上記基本回転数に対する補正量は、該給気温度に応じた空気の密度変化や気化ガスの燃焼速度の変化によらずに、バーナユニット５における気化ガスの良好な燃焼状態が確保されるように該給気温度に応じてあらかじめ実験的に定められている。
【００８７】
以上説明したようにして、本実施形態の装置では、種火バーナ４やメインバーナ３の燃焼を開始する際の気化ガスの結露を効果的に防止することができる。この結果、所望量の気化ガスを種火炎口１９やメイン炎口１８に供給して、種火バーナ４やメインバーナ３の着火・燃焼を良好に行うことができる。また、液体燃料の気化に実際に寄与する気化器６の本体部３１の燃料供給部分３１ａの温度に対する気化器温度センサ３６の検出温度TKの時間的な遅れの影響も適正に補償して、種火バーナ３やメインバーナ４の燃焼開始前の加温や、気化器６の予熱を過不足なく行うことができ、円滑に燃焼運転を開始することができる。
【００８８】
尚、以上説明した実施形態では、種火バーナ４及びメインバーナ３を備えた気化式燃焼装置を例にとって説明したが、種火バーナを備えずに、メインバーナのみを備えるような気化式燃焼装置についても本発明を適用することができることはもちろんである。この場合には、メインバーナの燃焼を本実施形態における種火バーナ４の燃焼を開始する場合と同様の手順によって開始するようにすればよい。
【図面の簡単な説明】
【図１】本発明の気化式燃焼装置の一実施形態の機構的構成を示す断面図。
【図２】図１の気化式燃焼装置の電子機器の構成を示すブロック図。
【図３】図１の気化式燃焼装置の作動を説明するためのフローチャート。
【符号の説明】
３…種火バーナ、４…メインバーナ、６…気化器、３５…電熱ヒータ、３６…気化器温度センサ、４３…燃焼ファン（送風手段）、４９…室温センサ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an operation control method for a vaporization type combustion apparatus that vaporizes and burns liquid fuel such as kerosene.
[0002]
[Prior art]
A vaporization type combustion apparatus that vaporizes and burns liquid fuel such as kerosene is vaporized by supplying liquid fuel to a vaporizer heated by a heater (electric heater) by an electromagnetic pump, and then the vaporized gas is supplied to the vaporizer. It is mixed with combustion air supplied from a combustion fan, supplied to the burner, and burned in the burner.
[0003]
In this type of vaporization combustion apparatus, a temperature sensor (hereinafter referred to as a vaporizer temperature sensor) for detecting the temperature of the vaporizer is attached to the vaporizer, and the combustion operation of the vaporization combustion apparatus is performed by a microcomputer or the like. Is controlled according to the temperature detected by the vaporizer temperature sensor. In this case, at the start of the combustion operation of the vaporization combustion apparatus, for example, the following operation control is performed.
[0004]
That is, when an operation start command is given to the control device by turning on the operation switch or the like, the control device first starts the operation of the heater of the vaporizer and starts heating the vaporizer. When the carburetor is heated (preheated) by the operation of the heater, and the temperature detected by the carburetor temperature sensor rises to a predetermined threshold temperature at which the liquid fuel can be vaporized by the vaporizer, the control device performs combustion. While operating the fan, the electromagnetic pump is operated to supply liquid fuel to the vaporizer. As a result, the vaporized gas and the combustion air produced by the combustion fan are mixed while the liquid fuel is vaporized by the vaporizer, and the mixed gas is supplied to the burner. In parallel with this, the igniter is operated to ignite the air-fuel mixture supplied to the burner, thereby starting combustion of the burner.
[0005]
By the way, in the operation control of this type of conventional vaporization type combustion apparatus, the threshold temperature that defines the timing for starting the supply of liquid fuel to the vaporizer or starting the operation of the combustion fan is generally a constant value (fixed). Value). In this case, the threshold temperature is set so that, for example, the combustion operation of the vaporization combustion apparatus can be started smoothly under a normal temperature environment.
[0006]
However, such a conventional vaporization type combustion apparatus has the following disadvantages particularly during operation in a low temperature environment. That is, in a low temperature environment, since the burner and the like of the vaporization type combustion apparatus are cold, the vaporization gas generated by the vaporizer is likely to be radiated in the process until it flows into the flame opening of the burner. For this reason, in the case where the above-mentioned threshold temperature is fixedly set in accordance with the operation of the vaporization type combustion apparatus in a normal temperature environment, the vaporized gas is used in the operation of the vaporization type combustion apparatus in a low temperature environment. However, the inconvenience that dew condensation easily occurs in the burner.
[0007]
In order to eliminate such inconvenience, the above-mentioned threshold temperature is set high, and supply of liquid fuel to the vaporizer and operation of the combustion fan are started when the temperature of the vaporizer rises sufficiently. It is conceivable to do so. However, in this case, there is an inconvenience that the time from the start of the operation of the vaporizing combustion apparatus to the start of the combustion operation of the burner is always long.
[0008]
In addition, depending on the attachment position of the vaporizer temperature sensor to the vaporizer, the temperature detected by the vaporizer by the vaporizer temperature sensor is a portion in contact with the liquid fuel of the vaporizer (the liquid fuel is supplied when vaporizing the liquid fuel). There may be a time lag with respect to the actual temperature of the vaporizer part (hereinafter referred to as vaporization part). In this case, with regard to this time delay, for example, the temperature of the carburetor is reduced as in the case where the combustion operation of the vaporization combustion apparatus is restarted after a relatively short time after the combustion operation of the vaporization combustion apparatus is stopped. Is already sufficiently high (hereinafter referred to as the first case), and after a sufficiently long time has elapsed since the combustion operation of the vaporization combustion apparatus was stopped, the combustion operation of the vaporization combustion apparatus Compared with the case where the temperature of the vaporizer is about the same as the ambient temperature in the vicinity of the installation location of the vaporization combustion apparatus (hereinafter referred to as the second case here) as in the case of starting Compared with the first case, the time delay in the second case is large.
[0009]
Therefore, when a time delay of the temperature detected by the carburetor temperature sensor occurs in this way, if the threshold temperature is fixedly set as described above, the liquid fuel is not supplied to the carburetor. The temperature of the vaporization part of the vaporizer at the start (at the start of the ignition process of the burner) is different (the temperature of the vaporization part of the vaporizer is higher in the second case than in the first case). Become). In this case, the threshold temperature needs to be set in accordance with the first case so that the liquid fuel can be surely vaporized in both the first and second cases. There is. However, when the threshold temperature is set in this way, in the second case, the time for heating the carburetor becomes longer than necessary, and the timing for starting the burner combustion becomes unnecessarily late. There has been a disadvantage that the temperature of the vaporization site becomes high.
[0010]
[Problems to be solved by the invention]
The present invention has been made in view of such a background, and an operation control method for a vaporization combustion apparatus capable of smoothly starting a combustion operation while preventing condensation of vaporized gas at the start of operation of the vaporization combustion apparatus. The purpose is to provide.
[0011]
In addition, even when the temperature detected by the vaporizer temperature sensor causes a time delay with respect to the temperature of the vaporizer in contact with the liquid fuel (the vaporization site), the temperature of the vaporization site is increased more than necessary. Another object of the present invention is to provide an operation control method for a vaporization type combustion apparatus capable of smoothly starting a combustion operation without causing inconvenience such as a delay in the start of combustion of a burner.
[0012]
[Means for Solving the Problems]
In order to achieve the above object, the operation control method for a vaporization type combustion apparatus of the present invention comprises a burner for burning a mixture of vaporized gas and liquid fuel, a vaporizer for vaporizing the supplied liquid fuel, In the operation control method of a vaporization type combustion apparatus, comprising: a heater that heats a vaporizer; and a blowing unit that supplies combustion air mixed with the vaporized gas to the burner via the vaporizer, the vaporization combustion At the start of operation of the apparatus, a first step of detecting the atmospheric temperature at the installation location of the vaporization combustion apparatus as an initial atmospheric temperature and starting the operation of the heater; and after the operation of the heater is started, the apparatus is attached to the vaporizer The temperature of the vaporizer is monitored by a vaporizer temperature sensor, and when the temperature detected by the vaporizer temperature sensor reaches a first threshold temperature determined according to the initial ambient temperature, the operation of the blower means A second step to start, and then the liquid fuel is supplied to the vaporizer after the temperature detected by the vaporizer temperature sensor reaches a second threshold temperature set higher than the first threshold temperature. A third step of igniting a burner, wherein the first threshold temperature is at least when the initial ambient temperature is lower than the predetermined value than when the initial ambient temperature is higher than a predetermined value Is determined in accordance with the initial ambient temperature so as to have a lower value.
[0013]
According to the present invention, after the operation of the heater is started (after the preheating of the carburetor is started), the temperature detected by the carburetor by the carburetor temperature sensor is equal to the initial ambient temperature detected at the start of operation of the vaporization combustion apparatus. When the corresponding first threshold temperature is reached, the operation of the blowing means is started, and air is supplied to the burner via the vaporizer. At this time, scavenging of the burner or the like is performed by the air supplied to the burner, and at the same time, the air is warmed through the vaporizer, so that it is warmed and heated by the air supplied to the burner.
[0014]
In the present invention, the temperature detected by the vaporizer temperature sensor further rises to a second threshold temperature that is higher than the first threshold temperature (this is a temperature at which the liquid fuel can be vaporized by the vaporizer). After that, the burner is ignited while supplying liquid fuel to the vaporizer. At this time, the liquid fuel supplied to the carburetor is vaporized by the heat of the carburetor, and the vaporized gas is supplied to the burner together with the air by the blowing means, and combustion is started.
[0015]
In this case, according to the present invention, the first threshold temperature that defines the operation start timing of the blower means is the operation of the vaporization combustion apparatus when the initial ambient temperature is lower than the predetermined value, that is, in a low temperature environment. When starting, it is set to a lower value than when the initial atmospheric temperature is higher than the predetermined value, that is, when the operation of the vaporizing combustion apparatus is started under a normal temperature environment. For this reason, basically, in the operation of the vaporization type combustion apparatus in a low temperature environment, the blowing means is operated earlier than usual, and the burner by the air heated through the vaporizer is used. Will be started earlier. Therefore, not only when the operation of the vaporization type combustion apparatus is started under a normal temperature environment, but also when the operation of the vaporization type combustion apparatus is started under a low temperature environment, the vaporization of the liquid fuel by the vaporizer and the burner It is possible to sufficiently warm the burner before starting ignition. As a result, it is possible to prevent the vaporized gas supplied to the burner from condensing when the burner is ignited. Further, in the operation of the vaporization type combustion apparatus under a normal temperature environment, the first and second threshold temperatures that are adapted thereto may be set, so that the blower is operated to heat the burner. It is possible to limit the time and the time for heating the vaporizer with the heater before the start of combustion of the burner.
[0016]
Therefore, according to the present invention, it is possible to smoothly start the combustion operation while preventing condensation of the vaporized gas at the start of operation of the vaporization type combustion apparatus.
[0017]
In the present invention, more preferably, the second threshold temperature is higher when the initial atmospheric temperature is lower than the predetermined value than when the initial atmospheric temperature is higher than the predetermined value. It is determined according to the initial ambient temperature so as to be a value.
[0018]
According to this, by setting the second threshold temperature that regulates the timing of supplying the liquid fuel to the vaporizer and the ignition of the burner as described above, the operation of the vaporization type combustion apparatus is performed particularly in a low temperature environment. When starting the vaporizer, the vaporization of the liquid fuel is started by the vaporizer while the vaporizer is heated to a higher temperature than when the operation of the vaporization combustion apparatus is started under a normal temperature environment. The For this reason, the burner can be sufficiently heated in accordance with the operation of the air blowing means, and can be vaporized by giving a sufficient amount of heat to the liquid fuel from the vaporizer. As a result, condensation of the vaporized gas can be prevented more reliably, and the vaporized gas can be favorably burned in the burner.
[0019]
Furthermore, in a preferred embodiment of the present invention, the first step includes a step of obtaining a temperature detected by the vaporizer temperature sensor as a vaporizer initial temperature at the start of operation of the vaporization type combustion apparatus. When the threshold temperature is at least the initial ambient temperature higher than the predetermined value, the liquid fuel of the vaporizer comes into contact when the temperature detected by the vaporizer temperature sensor reaches the first threshold temperature. The actual temperature of the part is determined according to the initial temperature of the vaporizer so as to be substantially constant regardless of the initial temperature of the vaporizer, and the second threshold temperature is detected by the vaporizer temperature sensor. When the temperature reaches the second threshold temperature, the initial temperature of the vaporizer is such that the actual temperature of the portion of the vaporizer that contacts the liquid fuel becomes substantially constant regardless of the initial temperature of the vaporizer. In response it is determined.
[0020]
According to this, when the operation of the vaporization type combustion apparatus is started under a normal temperature environment, the temperature detected by the vaporizer temperature sensor is a point where the liquid fuel in the vaporizer comes into contact with the liquid fuel when the liquid fuel is vaporized. Even if there is a time lag with respect to the actual temperature of the portion to which the fuel is supplied (hereinafter referred to as the actual temperature of the carburetor), the carburetor is independent of the initial temperature of the carburetor. When the actual temperature reaches a certain temperature corresponding to the first threshold temperature, the operation of the blowing means is started, and the actual temperature of the vaporizer corresponds to the second threshold temperature. Then, the burner is ignited while supplying liquid fuel to the vaporizer. That is, the operation of the blowing means for preheating the burner and the combustion of the burner do not depend on the temperature of the vaporizer at the start of operation of the vaporization combustion device, respectively, and the substantial temperature of the vaporizer is constant. It is performed at the timing when the temperature state is reached.
[0021]
For this reason, combustion of the burner can be started smoothly without causing excess or shortage of time for heating the burner or heating (preheating) the vaporizer before the start of combustion of the burner.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
One embodiment of the operation control method of the vaporization type combustion apparatus of the present invention will be described with reference to FIGS. FIG. 1 is a cross-sectional view showing a mechanical configuration of a vaporization type combustion apparatus according to the present embodiment, FIG. 2 is a block diagram showing a configuration of electronic equipment of the vaporization type combustion apparatus, and FIG. 3 explains the operation of the vaporization type combustion apparatus. It is a flowchart for doing.
[0023]
First, the mechanical configuration of the vaporization type combustion apparatus in the present embodiment will be described with reference to FIG. The vaporization type combustion apparatus of this embodiment is provided in, for example, an FF type hot air heating apparatus, and includes a rectangular box-like burner case 1 and a constant oil level device 2 that stores kerosene as liquid fuel. It has. The burner case 1 and the constant oil level device 2 are accommodated in an exterior case (not shown) of the hot air heater. In this case, the constant oil level device 2 is connected to a fuel tank (not shown) by piping, and kerosene is supplied from the fuel tank.
[0024]
In the following description, for the sake of convenience, the left-right direction in FIG. 1 is the front-rear direction of the burner case 1, and the left side and the right side of the burner case 1 are the front side and the rear side of the burner case 1, respectively.
[0025]
In the burner case 1, a burner unit 5 constituting the main burner 3 and the seed fire burner 4 and a vaporizer 6 attached to the burner unit 5 are accommodated.
[0026]
The main part of the burner unit 5 is composed of a main burner head 7, a pilot fire burner head 8, and a burner top 9.
[0027]
The main burner head 7 constitutes the main burner 3 together with a burner top 9 which will be described in detail later, and is a box-shaped one that opens upward and extends in the front-rear direction. The seed fire burner head 8 constitutes the seed fire burner 4 together with the burner top 9, and is a box-like one that opens upward in a shape substantially similar to the main burner head 7.
[0028]
This seed fire burner head 8 is formed such that its longitudinal length and depth are smaller than those of the main burner head 7, and its upper end surface is flush with the upper end surface of the main burner head 7. 7 is accommodated. In this case, the seed flame burner head 8 is supported on both upper end sides of the main burner head 7 via flanges (not shown) formed on both upper end sides.
[0029]
In the main burner head 7, spaces 10 are formed at the front and rear positions of the seed fire burner head 8 accommodated therein and at the lower position. This space 10 serves as a passage for supplying an air-fuel mixture burned in the main burner 3 (a mixture of vaporized gas of kerosene and air) to a later-described flame port 18 of the main burner 3 (hereinafter, this space). 10 is referred to as the main-side air-fuel mixture passage 10).
[0030]
A partition plate 13 is provided inside the seed fire burner head 8 to separate the interior into a front space 11 and a rear space 12. The partition plate 13 is formed with a through hole (burring hole) 15 having a protruding portion 14 protruding into the space 12, and the spaces 11 and 12 are communicated with each other through the through hole 15. Further, a through hole (burring hole) having a convex portion 16 protruding into the space 12 on the side wall of the rear end of the seed fire burner head 8 facing the partition plate 13 (the right end of the seed fire burner head 8 in FIG. 1). 17 is formed concentrically with the through hole 15 of the partition plate 13, and the space 12 is communicated with the main-side air-fuel mixture passage 10 through the through hole 17.
[0031]
Here, the space 11 on the front side in the seed fire burner head 8 serves as a passage for supplying an air-fuel mixture combusted by the seed fire burner 4 to a flame port 19 (to be described later) of the seed fire burner 4 (hereinafter, referred to as “air mixture”). This space 11 is referred to as a seed-fired air-fuel mixture passage 11). Further, the space 12 on the rear side in the seed fire burner head 8 distributes and supplies the air-fuel mixture generated in the carburetor 6, which will be described in detail later, to the main-side air-fuel mixture passage 10 and the seed-fire-side air-fuel mixture passage 11. (Hereinafter, the space 12 is referred to as the air-fuel mixture distributor 12).
[0032]
The burner top 9 is plate-shaped, and the burner heads 7 and 8 are closed on the upper end surfaces of the main burner head 7 having the above-described configuration and the seed fire burner head 8 accommodated therein. And is fixed to the main burner head 7 with screws or the like not shown.
[0033]
In the burner top 9, a plurality of flame ports 18 communicating with the main-side air-fuel mixture passage 10 are formed in front of the fire-ignition burner head 8, and the fire-side air-fuel mixture in the fire-ignition casing 8 is formed. A plurality of flame outlets 19 communicating with the seed-fired air-fuel mixture passage 11 are formed at positions above the passage 11. The craters 18 and 19 are a main crater for the main burner 3 and a seed crater for the seed burner 4, respectively. The number and the range of the main craters 18 are the number of the seed flares 19 and the existence thereof. It is supposed to be larger than the range.
[0034]
The burner unit 5 configured as described above is attached to a burner mounting member 20 provided in the burner case 1 and is held in the burner case 1. A combustion chamber 21 is formed above the burner unit 5 (in the upper space in the front side of the burner case 1 in FIG. 1) so as to face the main flame port 18 and the seed flame port 19.
[0035]
Further, a drain pipe 22 for discharging kerosene that remains in the main burner head 7 when the vaporized gas of kerosene is condensed is inserted into the lower end portion of the side wall at the rear end of the main burner head 7. ing. The drain pipe 22 is led out of the burner case 1 and is connected to the constant oil level device 2 through a drain pipe 23.
[0036]
Further, the air-fuel mixture distributor 12 in the seed fire burner head 8 includes a disc of the valve device 24 for adjusting the distribution ratio of the air-fuel mixture introduced into the main fire burner 3 and the seed fire burner 4. A valve body 25 is accommodated concentrically with the through holes 15 and 17.
[0037]
Since the valve device 24 does not constitute the essence of the present invention, only a brief description will be given here. However, the rod 26 extended from the central portion of the valve body 25 is connected to the rotary drive shaft 27a of the electric motor 27. The valve body 25 is moved in the front-rear direction via the rod 26 by rotating the rotary drive shaft 27a of the electric motor 27 by connecting with a connecting member 28 such as a piano wire. 15 (hereinafter referred to as the seed-fire side through hole 15) and the distance between the convex body 14 and the valve body 25, and the distance between the convex portion 16 of the through hole 17 (hereinafter referred to as the main side through hole 17) and the valve body 25. To adjust. In other words, the opening degree of the pilot-side through-hole 15 and the main-side through-hole 17 with respect to the air-fuel mixture distributor 12 is adjusted by moving the valve body 25 in the front-rear direction by the electric motor 27.
[0038]
Incidentally, the member 29 provided in the vaporization type combustion apparatus in the present embodiment accompanying the valve device 24 is the airtightness in the burner case 1 in the rod through hole 30 on the side wall of the burner case 1 through which the rod 26 penetrates. It is a sealing member for ensuring the property.
[0039]
The vaporizer 6 is mounted on the burner top 9 at a location above the air-fuel mixture distributor 12 in the seed fire burner head 8 and is fixed to the burner top 9 with screws or the like (not shown).
[0040]
The vaporizer 6 includes a main body portion 31 mainly constituting a front portion thereof and an exterior cover member 32 attached to a rear surface portion of the main body portion 31, and the main body portion 31 and the exterior cover. A space 33 that opens downward is formed in the vaporizer 6 by the member 32. The space 33 serves as a flow path that generates a mixture of the vaporized gas of kerosene and air and guides the mixture to the mixture distributor 12 in the seed fire burner head 8 (hereinafter, the space 33 is referred to as the space 33). Called the main air-fuel mixture passage 33). The main mixture passage 33 communicates with the mixture distribution section 12 through a through hole 34 formed in the burner top 9 above the mixture distribution section 12.
[0041]
The main body 31 of the vaporizer 6 incorporates an electric heater 35 and is heated by energizing the electric heater 35. A temperature sensor 36 for detecting the temperature of the main body 31 is attached to the rear end of the upper portion of the main body 31. Further, a heat receiving fin 37 is projected from the front surface portion of the main body 31, and the heat receiving fin 37 is located immediately above the seed flame port 19.
[0042]
In addition, an air introduction port 38 that opens toward the main air-fuel mixture passage 33 is formed in the upper portion of the exterior cover member 32 that forms the rear end portion of the vaporizer 6, and a fuel injection nozzle 39 is formed in the air introduction port 38. Has been inserted.
[0043]
The combustion injection nozzle 39 has a base 40 attached to the side wall at the rear end of the burner case 1, and extends from the base 40 through the air introduction port 38 to the main mixture passage 33. The fuel injection nozzle 39 is connected to the oil supply pipe 42 led out from the electromagnetic pump 41 mounted on the constant oil level device 2 via the base 40, and the constant oil level is obtained by operating the electromagnetic pump 41. The kerosene supplied from the vaporizer 2 is jetted toward the inner wall of the main body 31 of the vaporizer 6 in the main gas mixture passage 33.
[0044]
In addition, a combustion fan 43 as a blowing means is mounted outside the burner case 1 at the lower part of the side wall at the front end of the burner case 1. This combustion fan 43 blows air for combustion of the main burner 3 and the seed flame burner 4 by operating a fan motor 43a provided therein, and is formed at the lower part of the side wall at the front end of the burner case 1. Combustion air is supplied into the burner case 1 through the air introduction hole 44.
[0045]
In this case, in the burner case 1, the space 45 around the main burner head 7 (including the space below and behind the main burner head 7) is supplied with the vaporized gas of kerosene at the air inlet 38 of the vaporizer 6. An air passage for supplying combustion air (primary air) to be mixed is provided, and the combustion air supplied from the combustion fan 43 into the burner case 1 passes through the air passage 45 and is an air inlet of the carburetor 6. 38, and further led from the air inlet 38 to the main mixture passage 33 inside the carburetor 6.
[0046]
In addition, secondary air introduction holes (not shown) are formed in both side portions of the burner top 9, and a part of the air supplied from the combustion fan 43 into the burner case 1 is the secondary air introduction holes. Is supplied to the combustion chamber 21 as secondary air for combustion.
[0047]
Further, an exhaust gas outlet 46 for exhausting exhaust gas from the combustion chamber 21 is formed in the top plate at the upper end of the burner case 1. The exhaust gas outlet 46 is fitted with a radiator (heat exchanger) (not shown) of the hot air heating apparatus in the present embodiment.
[0048]
Note that the hot air heating device in the present embodiment is of the FF type, and the radiator is connected to an exhaust pipe (not shown) for leading the combustion exhaust gas to the outdoors, and the combustion fan 43 has a combustion An air supply pipe (not shown) for guiding the working air from the outdoors is connected. Although not shown in FIG. 1, the burner case 1 includes an ignition electrode for generating a spark discharge for igniting the seed fire burner 4, and combustion flames F 4 and F 3 of the seed fire burner 4 and the main burner 3. A flame detector, such as a frame rod, is disposed, and a convection fan that blows warm air into the room while convection of room air through the radiator is provided in the outer case of the warm air heater. (These ignition electrodes, flame detectors, convection fans, etc. are conceptually illustrated in the block diagram of FIG. 2 herein).
[0049]
Referring to FIG. 2, the hot air heating device in the present embodiment includes the electric motor 27 of the valve device 24, the electromagnetic pump 41, the fan motor 43 a of the combustion fan 43, and the vaporization in addition to the vaporization type combustion device having the above-described configuration. A control device 47 for controlling the operation of the electric heater 35 and the like of the vessel 6 is provided.
[0050]
This control device 47 is constituted by an electronic circuit including a microcomputer or the like, and includes a temperature sensor 36 of the vaporizer 6 (hereinafter referred to as a vaporizer temperature sensor 36), a flame detector 48, and a vaporization type combustion device. A sensor such as a room temperature sensor 49 for detecting a room temperature (atmosphere temperature) of a room in which the hot air heating device is installed is connected, and the electric motor 27 of the valve device 24, the electromagnetic pump 41, and the fan motor of the combustion fan 43 are connected. 43a, an electric heater 35 of the vaporizer 6, an igniter 51 for generating a spark discharge at the ignition electrode 50, and an actuator such as a fan motor 52a of the convection fan 52 are connected.
[0051]
The control device 47 controls the operation of each actuator based on a detection signal of a sensor such as the vaporizer temperature sensor 36, a predetermined program, or the like.
[0052]
Next, the operation of the hot air heater in this embodiment will be described.
[0053]
With reference to the flowchart of FIG. 3, in the hot air heating apparatus according to the present embodiment, when a not-shown operation switch is turned on, the control device 47 executes the process shown in the flowchart of FIG. The operation of the hot air heater including the device is controlled.
[0054]
That is, the control device 47 first acquires the current detected room temperature detected by the room temperature sensor 49 as the initial ambient temperature TS0, and acquires the current detected temperature detected by the vaporizer temperature sensor 36 as the initial vaporizer temperature TK0 (STEP 1).
[0055]
Then, the control device 47 sets first to third threshold temperatures T1, T2, T3 (T1 <T2 <T3) used in the control process described later, for example, according to the initial ambient temperature TS0 and the vaporizer initial temperature TK0. The settings are made as exemplified in the following Table 1 (STEP 2).
[0056]
[Table 1]

[0057]
These first to third threshold temperatures T1, T2, and T3 are thresholds for the temperature detected by the carburetor temperature sensor 36, and the first threshold temperature T1 is a timing for starting the operation of the combustion fan 43 as described later. The threshold temperature is specified. The second threshold temperature T2 is a threshold temperature that defines the timing for starting the combustion of the seed burner 4 as will be described later, and the third threshold temperature T3 is the timing for starting the combustion of the main burner 3 as will be described later. Is a threshold temperature that defines
[0058]
In this case, the setting types of the first to third threshold temperatures T1, T2, and T3 can be broadly classified, for example, when the initial ambient temperature TS0 is, for example, 5 ° C. or less (when the hot air heater is operated in a low temperature environment). ) And when the initial ambient temperature TS is higher than 5 ° C. (when operating the warm air heating device in a normal temperature environment), and in the latter case, the initial temperature of the vaporizer TK0 Is, for example, classified into a case where the temperature is 100 ° C. or lower and a case where the vaporizer initial temperature TK0 is higher than 100 ° C. Here, when the initial temperature TK0 of the carburetor is TK0> 100 ° C., basically, the operation of the hot air heater is resumed after a relatively short time after the hot air heater is stopped. (When the vaporizer 6 is still in a relatively high temperature state). In addition, when TK0 ≦ 100 ° C., basically, the operation of the hot air heater is performed after a sufficient time has elapsed since the previous operation of the hot air heater was stopped. In other words, this is a case where the temperature of the vaporizer 6 is not much different from the initial ambient temperature TS0.
[0059]
In this embodiment, the first threshold temperature T1 (10 ° C.) when TS0 ≦ 5 ° C. is sufficiently smaller than the first threshold temperature T1 (130 ° C. or 150 ° C.) when TS0> 5 ° C. Is set to Further, the second threshold temperature T2 (190 ° C) and the third threshold temperature T3 (240 ° C) when TS0 ≦ 5 ° C are respectively the second threshold temperature T2 (160 ° C or 180 ° C) when TS0> 5 ° C. ), A value larger than the third threshold temperature T3 (220 ° C.).
[0060]
In the case of TS0> 5 ° C., the portion where the liquid fuel injected from the fuel injection nozzle 39 of the main body 31 of the vaporizer 6 heated by the electric heater 35 as will be described later comes into contact (see FIG. 1). A portion to which reference numeral 31a is attached (hereinafter referred to as a fuel supply portion 31a) causes a time delay of the temperature detected by the carburetor temperature sensor 36 (the temperature of the portion to which the carburetor temperature sensor 36 is attached) with respect to the actual temperature. The first to third threshold temperatures T1 to T3 are set in consideration that the degree of the time delay differs depending on the vaporizer initial temperature TK0. That is, after the heating of the vaporizer 6 described later by the electric heater 35 is started, the temperature of the fuel supply portion 31a when the temperature detected by the vaporizer temperature sensor 36 reaches the first to third threshold temperatures T1 to T3. The first to third threshold temperatures T1 to T3 are set based on experiments and the like so that the actual temperature is substantially the same in the case of TK0 ≦ 100 ° C. and the case of TK0> 100 ° C. In this case, basically, when the initial temperature TK0 of the carburetor is low, the time delay of the temperature detected by the carburetor temperature sensor 36 with respect to the actual temperature of the fuel supply portion 31a of the carburetor 6 is higher than when the initial temperature TK0 is high. The difference in accordance with the vaporizer initial temperature TK0, which is longer and the time delay, becomes smaller as the heating by the electric heater 35 of the main body 31 of the vaporizer 6 proceeds, so the first to third Each of the threshold temperatures T1 to T3 is smaller in value in the case of TK0 ≦ 100 ° C. than the value in the case of TK0> 100 ° C. (first and second threshold temperatures T1 and T2) or an equivalent value (first 3 threshold temperature T3).
[0061]
Note that the actual temperatures of the fuel supply portion 31a of the carburetor 6 corresponding to the first to third threshold temperatures T1 to T3 when TS0> 5 ° C are about 170 ° C, 200 ° C, and 240 ° C, respectively. is there. The actual temperatures of the fuel supply portion 31a of the carburetor 6 corresponding to the first to third threshold temperatures T1 to T3 in the case of TS0 ≦ 5 ° C. are about 50 ° C., 240 ° C., and 260 ° C., respectively. is there. In any case, the second threshold temperature T2 and the third threshold temperature T3 are the actual temperatures of the fuel supply portions 31a corresponding to the second threshold temperature T2 and the third threshold temperature T3, respectively. The threshold temperature is set to a temperature at which the liquid fuel supplied to the carburetor 6 can be vaporized when the combustion operation is started.
[0062]
After setting the first to third threshold values T1 to T3 as described above, the control device 47 further controls the electric motor 27 of the valve device 24 to control the valve body 25 in the mixture distribution section 12. Is moved toward the main side through hole 17 and is seated on the convex portion 16 of the main side through hole 17 (STEP 3). As a result, the main side air-fuel mixture passage 10 of the main burner 3 is blocked from the air-fuel mixture distributing part 12, and the air-fuel mixture distributing part 12 is connected to the seed-fired-side air-fuel mixture of the seed fire burner 4 through the seed-fire-side through hole 15. Open to the passage 11 only. Further, in STEP 3, the control device 47 energizes the electric heater 35 and starts heating the main body 31 of the vaporizer 6. Note that the processing of STEPs 1 to 3 is performed almost simultaneously.
[0063]
In this way, after the energization of the electric heater 35 (heating of the vaporizer 6) is started, the control device 47 sequentially monitors the temperature detected by the vaporizer temperature sensor 36 (hereinafter referred to as reference symbol TK). Then, it is determined whether or not the detected temperature TK has increased to the first threshold temperature T1 set in STEP 2 (STEP 4).
[0064]
At this time, when the detected temperature TK of the carburetor temperature sensor 36 becomes TK ≧ T1, the control device 47 controls the fan motor 43a of the combustion fan 43 to start the operation of the combustion fan 43, and the combustion fan 43 Is rotated at a predetermined number of rotations (STEP 5). At this time, the air blown from the combustion fan 43 passes through the air passage 45, the main mixture passage 33, the mixture distribution section 12, the seed-side mixture passage 11, and the seed flame port 19 in the burner case 1. Then, the gas flows into the combustion chamber 21, thereby scavenging the combustion chamber 21 and the like.
[0065]
At this time, the air flowing through the main gas mixture passage 33 in the vaporizer 6 is warmed by receiving heat from the main body 31 of the vaporizer 6 heated by the electric heater 35. The warmed air flows through the air-fuel mixture distributor 12 and the pilot-fired air-fuel mixture passage 11 so that the pilot-burner head 8 having the air-fuel mixture distributor 12 and the pilot-fired air-fuel mixture passage 11 therein. Is also warmed. In particular, when the initial ambient temperature TS0 is TS0 ≦ 5 ° C. (in the case of operation of the hot air heater in a low temperature environment), the first threshold temperature T1 is set to a low value (10 ° C.). Therefore, the operation of the combustion fan 43, and thus the heating of the seed flame burner head 8, is started relatively early.
[0066]
When TS0> 5 ° C. (when the hot air heater is operated under a normal temperature environment), the temperature TK detected by the vaporizer temperature sensor 36 is TK0 ≦ 100 ° C. When the temperature reaches different from each other (130 ° C., 150 ° C.) in the case of> 100 ° C., the operation of the combustion fan 43 is started. However, due to the time delay of the temperature TK detected by the carburetor temperature sensor 36 described above, the combustion fan 43 is operated regardless of whether TK0 ≦ 100 ° C. or TK0> 100 ° C. The actual temperature of the fuel supply portion 31a of the main body 31 of the carburetor 6 when started is substantially the same temperature (about 170 ° C.).
[0067]
After starting the operation of the combustion fan 43 in this way, the control device 47 next determines whether or not the detected temperature TK of the carburetor temperature sensor 36 has risen to the second threshold temperature T2 set in STEP2. (STEP 6).
[0068]
At this time, when the temperature of the main body 31 further increases due to the heating of the main body 31 of the vaporizer 6 by the electric heater 35 and the detected temperature TK of the vaporizer temperature sensor 36 becomes TK ≧ T2, the control device 47 The ignition process of the seed fire burner 4 is executed, and the combustion operation of the seed fire burner 4 is started (STEP 7).
[0069]
In the ignition process of the seed fire burner 4, the control device 47 operates the igniter 51 while generating the spark discharge at the ignition electrode 50 while continuing the operation of the combustion fan 43. Further, the control device 47 controls the electromagnetic pump 41 to control the amount of kerosene discharged from the constant oil level device 2 by the electromagnetic pump 41 (= the amount of kerosene supplied to the fuel injection nozzle 39) to a predetermined amount, That predetermined discharge amount of kerosene is supplied to the fuel injection nozzle 39.
[0070]
At this time, the kerosene supplied to the fuel injection nozzle 39 is injected from the fuel injection nozzle 39 toward the fuel supply portion 31a of the main body 31 of the carburetor 6 in the main gas mixture passage 33 in the carburetor 6, It is vaporized by the heat of the fuel supply portion 31a of the main body 31. Further, at this time, the vaporized gas is mixed with air (primary air) introduced into the main gas mixture passage 33 from the air introduction port 38 of the vaporizer 6 to become a gas mixture, and the gas mixture becomes the main gas mixture. From the passage 33, the fuel is ejected into the combustion chamber 21 through the mixture distribution portion 12, the seed-fire-side through hole 15, the seed-fire-side mixture passage 11, and the seed flame port 19 in the seed-fire burner head 8. Then, the jetted air-fuel mixture is ignited by spark discharge of the ignition electrode 50, and combustion of the seed burner 4 starts.
[0071]
In this case, the seed flame burner head 8, the gas mixture distribution section 12 and the gas mixture side gas mixture passage 11 in the inside thereof are actuated by the operation of the combustion fan 43 preceding the ignition process of the seed flame burner 4 (STEP 5). So that it is warmed up. For this reason, the vaporized gas of the liquid fuel generated in the main gas mixture passage 33 in the vaporizer 6 is less emitted by the vaporized gas in the process of flowing through the seed burner head 8 to the seed flame port 19. Thus, the vaporized gas can be supplied to the seed flame port 19 and burned while avoiding condensation of the vaporized gas.
[0072]
In particular, in an operation under a low temperature environment where the initial ambient temperature TS0 is TS0 ≦ 5 ° C., in other words, in an operation environment in which vaporized gas is likely to condense, the operation of the combustion fan 43 is started early. The second threshold temperature T2 that defines the timing of starting the combustion of the seed burner 4 is higher than that in the case of operation under a normal temperature environment. For this reason, in the case of operation in a low temperature environment, the starter burner head 8 is sufficiently warmed at the start of the combustion operation of the starter burner 4 than in a normal case, and the inside of the vaporizer 6 In the process in which the vaporized gas generated in (3) flows to the seed flame port 19, less heat is released from the vaporized gas. Further, since the temperature of the main body 31 of the carburetor 6 at the start of the combustion operation of the seed flame burner 4 is relatively high, the liquid fuel injected from the fuel injection nozzle 39 has sufficient heat. It can be absorbed and vaporized from the main body 31 of the vaporizer 6. As a result, even in operation in a low temperature environment where vaporized gas is likely to condense, the vaporized gas generated in the vaporizer 6 is supplied to the seed flame port 19 without causing condensation during the process of flowing into the seed flame port 19. Burned.
[0073]
In the operation under a normal temperature environment, when the temperature TK detected by the vaporizer temperature sensor 36 reaches the second threshold temperature T2 (when the combustion of the seed burner 4 is started), The temperature of the fuel supply portion 31a of the main body 31 is a substantially constant temperature (about 200 ° C.) regardless of the initial vaporizer temperature TK0. Further, as described above, the fuel supply portion 31a of the main body 31 of the carburetor 6 when the operation of the combustion fan 43 is started before the start of the combustion of the seed burner 4 (when TK ≧ T1). The temperature is also substantially constant regardless of the initial vaporizer temperature TK0.
[0074]
For this reason, it is possible to warm the pre-ignition burner head 8 for starting the combustion of the pre-ignition burner 4 and preheat the vaporizer 6 in a necessary time without excess or deficiency.
[0075]
When combustion of the seed flame burner 4 starts, the main body 31 of the vaporizer 6 is heated via the heat receiving fins 37 by the combustion flame F4 rising from the seed flame port 19 (heat is fed back). Therefore, the main body 31 of the vaporizer 6 is basically heated by the heat of the electric heater 35 and the combustion heat of the seed fire burner 4 immediately after the start of combustion of the seed fire burner 4.
[0076]
In this manner, the combustion of the seed fire burner 4 is started, and after a certain time (for example, 5 seconds) has elapsed since the combustion flame F4 of the seed fire burner 4 is detected by the flame detector 48, the combustion of the seed fire burner 4 is performed. When the is stabilized, the control device 47 stops the operation of the igniter 51, starts the operation of the convection fan 52, and starts blowing hot air into the room by the combustion heat of the seed burner 4 (STEP 8). At this time, the rotational speed of the convection fan 52 is controlled to a predetermined minimum rotational speed, for example.
[0077]
Further, the control device 47 monitors the detected temperature TK of the vaporizer temperature sensor 36, and determines whether or not the detected temperature TK has increased to the third threshold temperature T3 set in STEP 2 (STEP 9).
[0078]
At this time, when the detected temperature TK of the vaporizer temperature sensor 36 becomes TK ≧ T3, the control device 47 executes a process of starting the combustion of the main burner 3 together with the combustion of the seed flame burner 4 (STEP 10). In the combustion start process of the main burner 3, the control device 47 controls the discharge amount of the electromagnetic pump 41 so as to supply a predetermined amount of kerosene to the fuel injection nozzle 39, and matches the supply amount of the kerosene. The number of revolutions of the combustion fan 43 is controlled to a predetermined number of revolutions so that a sufficient amount of air is supplied to the main burner 3 and the seed flame burner 4. Further, the control device 47 controls the electric motor 27 of the valve device 24 to move the valve body 25 to a predetermined position between the seed-fire side through hole 15 and the main side through hole 17 to distribute the air-fuel mixture. The part 12 is opened to both the main-side mixture passage 10 and the seed-fire-side mixture passage 11. In addition, the movement position of the valve body 25 at this time is a position near the seed-fire side through hole 15.
[0079]
As a result, an air-fuel mixture of kerosene vaporized gas and air (primary air) is generated in the main air-fuel mixture passage 33 in the carburetor 6, and a part of the air-fuel mixture is transferred from the air-fuel mixture distributor 12 to the side of the igniter. Combustion of the seed flame burner 4 is continued by being supplied to the seed flame port 19 via the mixture passage 11, and the remainder of the mixture generated in the carburetor 6 is transferred from the mixture distribution section 12 to the main-side mixture passage 10. Is supplied to the main crater 18 and is ejected from the crater 18. Then, the combustion flame F4 of the seed burner 4 is transferred to the air-fuel mixture ejected from the main flame port 18, the main burner 3 is ignited, and the burner unit 5 in which the main burner 3 and the seed fire burner 4 are combined. The whole combustion operation starts. Further, the continuous operation of the convection fan 52 causes the warm air to be blown into the room by the combustion heat of the main burner 3 and the seed flame burner 4.
[0080]
In this case, before the combustion of the main burner 3 is started, the seed fire burner head 8 is heated by the combustion of the seed fire burner 4 which has already been started, and the main burner head 7 is mixed on the main side inside thereof. The air passage 10 is also heated by the heat of the seed fire burner head 8 and the heat of the burner top 9. For this reason, of the vaporized gas of the liquid fuel generated in the main gas mixture passage 33 in the vaporizer 6, not only the vaporized gas flowing through the seed flame burner head 8 to the seed flame port 19 but also the seed flame. As for the vaporized gas flowing from the mixture distribution section 12 of the burner head 8 to the main flame opening 18 through the main-side mixture passage 10 in the main burner head 7, the heat released by the vaporized gas during the flow of the vaporized gas. Will be less. Therefore, the vaporized gas can be supplied to the main flame port 18 and burned while avoiding the condensation of the vaporized gas.
[0081]
In particular, in an operation in a low temperature environment where vaporized gas is likely to condense (operation when TS0 ≦ 5 ° C.), the third threshold temperature T3 that defines the timing of starting combustion of the main burner 3 is normal. Since the temperature is higher than that in the case of operation in a temperature environment, the main burner head 8 is sufficiently warmed before the start of the combustion operation of the main burner 4 than in the normal case, and when the combustion of the main burner 3 is started. The liquid fuel injected from the fuel injection nozzle 39 can be vaporized by absorbing sufficient heat from the main body 31 of the vaporizer 6. As a result, as with the start of combustion of the seed flame burner 4, the vaporized gas generated in the carburetor 6 is also generated in the main flame port 18 and the seed flame port even in operation in a low temperature environment where vaporized gas is likely to condense. In the process of flowing to 19, there is no dew condensation and it is supplied to these flame openings 18 and 19 and burned.
[0082]
In the operation under a normal temperature environment, the main body of the carburetor 6 when the temperature TK detected by the carburetor temperature sensor 36 reaches the third threshold temperature T3 (when the combustion of the main burner 3 is started). The temperature of the fuel supply portion 31a of the section 31 is a substantially constant temperature (about 240 ° C.) regardless of the initial vaporizer temperature TK0.
[0083]
For this reason, the heating of the main burner head 7 and the preheating of the vaporizer 6 for starting the combustion of the main burner 3 together with the combustion of the seed flame burner 4 can be performed without excess or deficiency in a necessary time.
[0084]
Regarding the operation of the electric heater 35 of the vaporizer 6, the detected temperature TK of the vaporizer temperature sensor 36 is, for example, 220 ° C. (this embodiment is equal to the third threshold temperature T3 when TS0> 5 ° C.) or higher. After the rise, the controller 47 turns on / off the electric heater 35 so that the temperature of the main body 31 of the vaporizer 6 is maintained at a substantially constant temperature of, for example, 220 to 240 ° C.
[0085]
After starting the combustion of the main burner 3 as described above, the control device 47 detects the room temperature detected by the room temperature sensor 49 while blowing hot air and convection of room air by the operation of the convection fan 52. The rotational speed of the combustion fan 43, the amount of kerosene discharged from the electromagnetic pump 41, and the rotational speed of the convection fan 55 are controlled in accordance with the target room temperature set in advance by the user, so that the room temperature is substantially maintained at the target room temperature. The temperature control operation of the air heating device is performed (STEP 11). In this case, basically, as the room temperature detected by the room temperature sensor 49 is lower than the target room temperature, the number of revolutions of the combustion fan 43 and the amount of kerosene discharged from the electromagnetic pump 41 are increased to increase the amount of combustion of the burner unit 5. In addition, the rotational speed of the convection fan 52 is increased to increase the amount of warm air blown. When the room temperature detected by the room temperature sensor 49 approaches the target room temperature, the rotational speed of the combustion fan 43 and the discharge amount of the electromagnetic pump 41 are reduced to reduce the combustion quantity of the burner unit 5 and the rotational speed of the convection fan 52. To reduce the amount of warm air blown.
[0086]
Note that, since it does not form the essence of the present invention, only a brief description will be given here. In this embodiment, the supply temperature of combustion air by the combustion fan 43 (specifically, for example, at the intake port of the combustion fan 43) The air temperature or the like) is detected by a supply air temperature sensor (not shown). Then, the rotation speed of the combustion fan 43 is controlled during the combustion of the seed burner 4 from STEP 8 to STEP 9 or during the combustion of the seed burner 4 and the main burner 3 in the temperature control operation of STEP 11 (the transmission of combustion air). In the control of the air volume), the entire burner unit 5 is combusted so as to ensure a good combustion state of the seed burner 4 and the main burner 3 in an environment of a predetermined supply air temperature (for example, 20 ° C.) of about room temperature. The rotation speed of the combustion fan 43 determined in advance with respect to the amount or the supply amount of the liquid fuel to the carburetor 6 is set as the basic rotation speed, and this basic rotation speed is appropriately corrected according to the detected temperature of the supply air temperature sensor. Thus, the target rotational speed of the combustion fan 43 is determined, and the rotational speed of the combustion fan 43 is controlled. In this correction, the density of the combustion air supplied to the burner unit 5 (and hence the amount of oxygen per unit volume of the air) changes according to the supply air temperature, and the burned gas combustion rate in the burner unit 5 ( It is considered that the ease of occurrence of the combustion reaction) changes according to the supply air temperature. The correction amount of the rotation speed of the combustion fan 43 with respect to the basic rotation speed is good for the vaporized gas in the burner unit 5 regardless of the change in the air density and the change in the combustion speed of the vaporized gas according to the supply air temperature. In order to ensure a proper combustion state, it is experimentally determined in advance according to the supply air temperature.
[0087]
As described above, in the apparatus of the present embodiment, it is possible to effectively prevent the vaporized gas from condensing when starting the combustion of the seed flame burner 4 and the main burner 3. As a result, a desired amount of vaporized gas can be supplied to the seed flame port 19 and the main flame port 18 to ignite and burn the seed flame burner 4 and the main burner 3 satisfactorily. In addition, the effect of the time delay of the detected temperature TK of the vaporizer temperature sensor 36 on the temperature of the fuel supply portion 31a of the main body 31 of the vaporizer 6 that actually contributes to the vaporization of the liquid fuel is also properly compensated for. Heating before the start of combustion of the fire burner 3 and the main burner 4 and preheating of the vaporizer 6 can be performed without excess and deficiency, and the combustion operation can be started smoothly.
[0088]
In the embodiment described above, the vaporization type combustion apparatus including the seed fire burner 4 and the main burner 3 has been described as an example. However, the vaporization type combustion apparatus including only the main burner without including the seed fire burner. Of course, the present invention can also be applied to. In this case, the combustion of the main burner may be started by the same procedure as that for starting the combustion of the seed flame burner 4 in the present embodiment.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a mechanical configuration of an embodiment of a vaporization type combustion apparatus of the present invention.
2 is a block diagram showing a configuration of an electronic device of the vaporization type combustion apparatus of FIG.
FIG. 3 is a flowchart for explaining the operation of the vaporization type combustion apparatus of FIG. 1;
[Explanation of symbols]
3 ... seed burner, 4 ... main burner, 6 ... vaporizer, 35 ... electric heater, 36 ... vaporizer temperature sensor, 43 ... combustion fan (air blowing means), 49 ... room temperature sensor.

Claims (3)

A burner for burning a mixture of vaporized gas and air of liquid fuel, a vaporizer for vaporizing the supplied liquid fuel, a heater for heating the vaporizer, and combustion air for mixing with the vaporized gas In an operation control method of a vaporization type combustion apparatus provided with a blowing means for supplying to the burner via a vaporizer,
At the start of operation of the vaporization type combustion apparatus, a first step of detecting the ambient temperature of the place where the vaporization type combustion apparatus is installed as an initial atmospheric temperature and starting the operation of the heater; The temperature of the vaporizer is monitored by a vaporizer temperature sensor attached to the evaporator, and when the temperature detected by the vaporizer temperature sensor reaches a first threshold temperature determined according to the initial ambient temperature, the blower fan And then supplying liquid fuel to the vaporizer after the temperature detected by the vaporizer temperature sensor has reached a second threshold temperature set higher than the first threshold temperature. And a third step of igniting the burner,
The first threshold temperature is set to be lower when at least the initial ambient temperature is lower than the predetermined value than when the initial ambient temperature is higher than a predetermined value. An operation control method for a vaporization type combustion apparatus, characterized by being determined according to an initial atmospheric temperature. The second threshold temperature is set so that the initial ambient temperature is higher when the initial ambient temperature is lower than the predetermined value than when the initial ambient temperature is higher than the predetermined value. The operation control method for a vaporization type combustion apparatus according to claim 1, wherein the operation control method is determined according to The first step includes a step of obtaining a temperature detected by the vaporizer temperature sensor as a vaporizer initial temperature at the start of operation of the vaporization type combustion device,
The liquid of the vaporizer when the temperature detected by the vaporizer temperature sensor reaches the first threshold temperature is at least the first threshold temperature when the initial ambient temperature is higher than the predetermined value. The actual temperature of the portion in contact with the fuel is determined according to the initial temperature of the vaporizer so as to be substantially constant regardless of the initial temperature of the vaporizer, and
The second threshold temperature is determined based on the initial temperature of the carburetor when the temperature detected by the vaporizer temperature sensor reaches the second threshold temperature. 3. The operation control method for a vaporization combustion apparatus according to claim 1, wherein the operation control method is determined according to the initial temperature of the vaporizer so as to be substantially constant.

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