OXYGEN FEEDING SYSTEM OF SELF-CONTAINED REGENERATIVE BREATHING APPARATUS WITH OPTIMUM OXYGEN CONTENT
Purpose. To develop a self-contained regenerative breathing apparatus with optimum oxygen content (up to 60 %) in the gas-air mix for enhancement of the protective power time. Methods. Experimental and analytical methods of investigations of dynamics of gas-air mix streams during various constructive changes in self-contained regenerative breathing apparatuses. Results. The functional circuits of a breathing apparatus with parallel and sequential layout of regenerative and absorbing cartridges have been designed, the experimental investigations of changing the streams in the air system have been conducted on the “iron lungs” dynamic installation. The functional circuit of the breathing apparatus with parallel and sequential layout of the regenerative and absorbing cartridges and bypass valve has been proposed which will allow accelerating the apparatus protective power time. Scientific novelty. Based on the results of the comparative investigations of the functional circuits of the breathing apparatus with parallel and sequential layout of the regenerative and absorbing cartridges the novel construction of the breathing apparatus with bypass valve for changing gas-air mix streams in the air system of the breathing apparatus proportionally to oxygen content has been developed. Practical value. The conducted investigations permit to determine directions for improving the constructions of the regenerative breathing apparatus with optimum oxygen content and to eliminate shortcomings in the breathing apparatus construction.