The disclosure provides a gas flow detector comprising a conduit, a first and a second pressure gauges. The conduit includes a flexible pipe, a first and a second connecting pipes. The flexible pipe has a contraction portion, a throat and an expanding portion. Further, the throat is sandwiched between the contraction portion and the expanding portion, and the inner diameter of the throat is smaller than that of the contraction portion and the expanding portion. The first and the second pressure gauges are configured to respectively detect the gas pressure of the first connecting pipe and the throat, and the gas flow rates of the first connecting pipe and the throat are calculated from the reading of the difference of the gas pressures. A positive airway pressure apparatus containing the gas flow detector is also disclosed herein.本發明提供一種氣體流量偵測裝置,其包含導管、第一及第二壓力計。導管包含可撓性管狀結構、第一及第二連接管,其中可撓性管狀結構具有收縮段、喉部及擴張段。喉部係夾置於收縮段及擴張段之間,且喉部之管徑小於收縮段及擴張段之管徑。第一、第二壓力計係分別測量第一連接管及喉部之氣體壓力,並且藉由所讀出之氣體壓力差,計算第一連接管與喉部內的氣體流量。一種包含上述氣體流量偵測裝置的陽壓呼吸器亦揭露於其中。400‧‧‧導管410‧‧‧可撓性管狀結構411‧‧‧收縮段412‧‧‧喉部413‧‧‧擴張段420‧‧‧第一連接管430‧‧‧第二連接管
