Method for constructing a breathing-gas mixing system for open, closed and semi-closed circuits having a constant partial pressure of oxygen, with the possibility of replacing the inert gas while maintaining a constant partial pressure of one of the inert gases from a specified depth

Abstract

The subject of the application is a method of constructing a breathing mixer system in an open, closed, or semi-closed circuit with a constant oxygen partial pressure, as shown in the drawing, with the ability to use oxygen or a mixture with oxygen and maintain a constant oxygen partial pressure from a specified depth. This involves cyclic emptying of an oxygen-supplied cylinder from a reducer with a relative overpressure decreasing with depth, and a cylinder dosing air or an inert gas-oxygen mixture, supplied from a reducer with an overpressure directly proportional to the critical depth at which the absolute pressure of oxygen and the mixture with oxygen are equal, in an open circuit. Inert gas dosing begins in all circuit variants.