| 摘要 |
PURPOSE: To provide a mixture containing an air/oxygen ratio by making a mixture of a plurality of fluids flow from an outlet by axially displacing a valve member having a cylindrical wall formed with a slot and setting and controlling a mixing ratio of introduced fluids at a circumferential rotation position of the valve member. CONSTITUTION: In this fluid mixing device for preparing a mixture of air and oxygen dosed to a patient having a respiratory disease, a mixing ratio of two kinds of fluids entering through inlets 21, 22 is preset by rotating a cover plate 5 and rotating a valve member 3 and a cylindrical wall 32. Namely, a ratio that a slot 32a on the cylindrical wall 32 is matched to slots 25a, 25b of inlet end walls 25, 26 is determined. A pressure of oxygen supplied to the inlet 21 is reduced to a pressure of air supplied to the inlet 22 side by a demand valve 70. The mixture is supplied from an outlet 23 to the device by the movement of the valve member 3 against a spring 4 corresponding to a negative pressure applied from an respiratory device to the outlet 23 at the time of supplying the mixture. |
