| 摘要 |
<p>The device is of the type in which breathing gas, taken from a pressure-gas supply source through an injector and volumetrically metered in a pressure regulating valve, is supplied, in the inspiration phase, to the user and discharged, in the expiration phase, through an exhaling valve. A control space is divided, by an adjustable partition, into an inspiration chamber and an expiration chamber, and the ratio of the volumes of the two chambers is adjustable by adjustment of the partition. A frequency valve is connected to a source of control gas, and respective first pneumatic control elements connect the chambers, on their upstream sides, to the frequency valve and control supply of control gas to the chambers. Respective second pneumatic control elements connect the downstream sides of the chambers to a bistable storage which is connected to the exhaling valve. The first pneumatic control elements comprise NAND pneumatic elements, and the second pneumatic control elements comprise either identity gates or pairs of NAND elements connected in series with each other. The output sides of the bistable storage are connected to the respective first pneumatic control elements. When the inspiration chamber is filled with control gas, the bistable storage closes the exhaling valve and, when the expiration chamber is filled with control gas, the exhaling valve is opened.</p> |
