On Sat, Apr 18, 2020 at 06:47 PM, Steve S wrote:
What is the current proposed method of O2 introduction?
The primary project on this group is using a compressed O2/air mixer device that is apparently part of the normal things around a hospital.
Here is a post that suggest the possibility of using a fuel injector as a valve that can be pulsed at a rapid rate. If a regular solenoid valve was not fast enough to provide small enough bursts of air/O2 for easy mixing. Likely there is a need to mix O2/air where the normal mixing device is not available.?
/g/VentilatorDevelopers/message/1609If both the air and O2 were pre-regulated by accurate pressure regulators, the ratio of on/off times could work. Many regulators experience a large output pressure drop when the flow switches form off to on. Don't know if the regulators were of identical design, if that drop in pressure when the regulators can't keep up with the flow, would cancel each other out in the overall mix calculations. (Hmmm.. With widely different on/off times for the air and O2, and reserve air/O2 stored in the internal space of their respective plumbing, especially at high pulse rates, the pressure drops over time/volume may be a messy thing to compensate for. Hopefully a regulator that can stay accurate when switched from off to on is possible.)
Tom, wb6b
