COMBUSTION DEVICE

PROBLEM TO BE SOLVED: To prevent shortage of high voltage-side output to supply power to a fan motor driving circuit in pre-purge and post-purge, in a combustion device in which power is supplied to a fuel valve driving circuit from a low voltage-side output of a transformer, and power is supplied t...

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Bibliographische Detailangaben
Hauptverfasser: KUBO TAKASHI, IKEDA AKIRA, FUJIMOTO TAKEO, OKITA TAKUYA, ZHAO HUAN YU, FUJITA HIROSHI, NAKAJIMA AKITAKA
Format: Patent
Sprache:eng ; jpn
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Zusammenfassung:PROBLEM TO BE SOLVED: To prevent shortage of high voltage-side output to supply power to a fan motor driving circuit in pre-purge and post-purge, in a combustion device in which power is supplied to a fuel valve driving circuit from a low voltage-side output of a transformer, and power is supplied to the fan motor driving circuit for combustion from the high voltage-side output of the transformer.SOLUTION: In a case when a fan motor 51 to which power source is supplied from a high voltage-side output, is driven without driving fuel valves 41, 42 to which power is supplied from a low voltage-side output of a transformer 14, lowering of driving voltage of the fan motor 51 is prevented by outputting bleeder electric current to bleeder resistance 23 from the low voltage-side output, thus pre-purge operation and post-purge operation can be performed with proper fan motor rotating speed while suppressing increase in size of an apparatus and loss of electric power. 【課題】トランスの低電圧側出力から燃料弁駆動回路に電源供給され、トランスの高電圧側出力から燃焼用ファンモータ駆動回路に電源供給がされる燃焼装置において、プリパージ及びポストパージ時にファンモータ駆動回路に電源供給する高電圧側出力が不足することを防止する。【解決手段】トランス14の低電圧側出力から電源供給される燃料弁41,42を駆動せずに、高電圧側出力から電源供給されるファンモータ51を駆動する場合に、低電圧側出力からブリーダ抵抗23にブリーダ電流を出力することによりファンモータ51の駆動電圧が低下することを回避し、機器の大型化や電力損失の低減を図りつつ適正なファンモータ回転数でプリパージ動作やポストパージ動作を行えるようにする。【選択図】図1