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    • 2. 发明申请
    • ADJUSTABLE ORIFICE PLATE FOR EXHAUST DUCTS
    • 可调节排气管
    • WO2004013539A1
    • 2004-02-12
    • PCT/US2003/024256
    • 2003-08-05
    • DURR INDUSTRIES, INC.
    • ROESLER, BruceDe BORCHGRAVE, AdrienSPRINKLES, CliftonCOOK, Lawrence, A.
    • F24C1/14
    • F24C15/001F26B23/02F26B25/009
    • An exhaust duct orifice adjustment device for a gas-fired heater used to indirectly heat an oven communicating with a heat exchanger, wherein the exhaust duct includes a fixed annular orifice plate and a switch having a pressure sensor on opposed sides of the fixed orifice plate, turning off the burner if the pressure drop falls below a predetermined minimum. The orifice adjustment mechanism includes a moveable plate upstream of the fixed orifice plate having an opening communicating with the opening in the fixed orifice plate and an adjustment mechanism moving the orifice adjustment plate from a retracted position, wherein the opening through the fixed orifice plate is substantially unobstructed, to an extended position which restricts the opening through the fixed orifice plate, thereby adjusting the pressure drop.
    • 一种用于间接加热与热交换器连通的烤箱的燃气加热器的排气管孔调节装置,其中排气管道包括固定环形孔板和在固定孔板的相对侧上具有压力传感器的开关, 如果压降低于预定的最小值,则关闭燃烧器。 孔口调节机构包括在固定孔板上游的可移动板,其具有与固定孔板中的开口连通的开口和调节机构,该调节机构使孔板调节板从缩回位置移动,其中通过固定孔板的开口基本上 无阻塞地延伸到限制通过固定孔板的开口的延伸位置,从而调节压降。