Rebreather system

Abstract

A semi-closed rebreather with two breathing bags and a canister removing carbon dioxide from the exhaled breath, the rebreather using a normal open type of solenoid valve to control the flow of replenishment gas supplied to the rebreather circuit by at least one replenishment gas cylinder, i.e. that, in the absence of energy, takes the open condition thereby allowing a replenishment gas flow witha maximum flow rate predetermined during the initial design or adjustment step.

Description

technical field [0001] The present invention relates to a semi-closed circuit rebreather system. Background technique [0002] A semi-closed circuit rebreather is a device that allows a diver's exhaled gas to be reused by filtering the contained carbon dioxide and replacing the oxygen metabolized during breathing. [0003] The air around us is composed of about 21% oxygen, 78% nitrogen and 1% other gases such as helium, argon and others. In order to survive, humans must breathe gases with a minimum oxygen content. Not all the oxygen you breathe is metabolized and thus used up during respiration, but that doesn't mean you can just breathe gas that contains the amount of oxygen that is actually metabolized. [0004] For example, under normal conditions, we inhale 21% of our oxygen and exhale about 17% (this is why, for example, mouth-to-mouth breathing can provide the oxygen needed to maintain or restore basal levels of oxygen in a person undergoing CPR), That is, we metabo...

AI Technical Summary

Problems solved by technology

For various reasons, this type leads to an extreme simplification of the system, which is not the purpose of the invention, but has a disadvantage: if the 4 units of oxygen metabolized in the respiratory cycle must be replenished, then 6 units must also be added while doing so Nitrogen

This leak has two obvious disadvantages: the lost gas also contains oxygen, so the system is less efficient than a closed-loop system, and, moreover, by using a mixture of oxygen and nitrogen to supplement the oxygen, relative to the gas mixture in the cylinder, the total will get a lower fraction of oxygen than the starting gas

[0030] It should be noted that in semi-closed rebreathers, the aid of measurements and mechanical intervention could theoretically be eliminated by supplying nitrox gas through an orifice defining a rather high flow with a constant flow rate, but this approach is limited in terms of the use of gas very inefficient, moreover, for the calculation of decompression, it is desired to know the composition of the gas breathed, making a semi-closed system with supplementary flow dynamic adjustment turn out to be more favorable

However, in the absence of electrical and / or electronic failure in these systems, current rebreather systems cease the supply of supplemental gas, creating a dangerous situation for the user

Images