Oxygen concentration detection mechanism, oxygen machine and oxygen concentration detection method in oxygen machine

The invention discloses an oxygen concentration detection mechanism, an oxygen machine and a method for detecting the concentration of oxygen in the oxygen machine, and the oxygen concentration detection mechanism comprises a detection tube which is provided with an air inlet and an air outlet; the ultrasonic gas concentration detection sensor is arranged in the detection tube to detect the oxygen concentration; the gas compressor is connected to the gas inlet of the detection pipe and is used for conveying oxygen; and the pressure sensor is arranged in the detection pipe and is in signal connection with the gas compressor, and the pressure sensor controls the operation power of the gas compressor according to the detected pressure value so that the air pressure in the detection pipe can be kept constant. The oxygen concentration detection mechanism is good in oxygen concentration detection stability. 本发明公开了氧气浓度检测机构、氧气机及氧气机内氧气浓度检测方法，氧气浓度检测机构包括：检测管，所述检测管设有进气口及出气口；超声波气体浓度检测传感器，设于所述检测管内以检测氧气浓度；气体压缩机，连接于所述检测管的进气口