Closed-circuit breathing apparatus with a monitoring device

Abstract

The invention relates to a system composed of a closed-circuit breathing apparatus (1) and a monitoring device (13-15) therefor, wherein the closed-circuit breathing apparatus has: a breathing mask (2), a breathing circuit which leads from the breathing mask (2) via an expiration hose (3), a scrubber material cartridge (4) for binding CO2, a spring-loaded breathing bag (5) and an inspiration hose (7) and back to the breathing mask, an oxygen cylinder (11) with compressed oxygen which is connected via a constant-metering device (8) to the breathing circuit and via a minimum valve (9) to the breathing bag (5), wherein the minimum valve (9) is configured to open in reaction to the breathing bag collapsing owing to a lack of breathing gas in the breathing circuit, and therefore to fill the breathing bag (5) with oxygen from the oxygen cylinder (11) until it is filled, and a pressure sensor (12) for sensing the pressure in the oxygen cylinder (11), characterized in that the constant-metering device (8) is configured to provide the breathing circuit with oxygen with a low basic volume flow which is less than the average oxygen volume requirement of an unstressed person, and in that the monitoring device (13-15) is configured to calculate from the instantaneous pressure value supplied by the pressure sensor (12) and the output pressure value of the compressed oxygen in the oxygen cylinder at the start of use the quantity of oxygen consumed by the breathing of the apparatus wearer and the quantity of oxygen still remaining in the oxygen cylinder (12).

Description

technical field [0001] The invention relates to a system consisting of a rebreather protective device (Kreislaufatemschutzgerät) and a monitoring device for the rebreather protective device, wherein the rebreather protective device has: [0002] breathing mask; [0003] Breathing circuit from the breathing mask via the exhalation hose for CO 2 - combined breathing lime cartridge (Atemkalkpatrone), elastically loaded breathing bag (Atembeutel) and suction hose return leading to the breathing mask; [0004] Oxygen cylinder with compressed oxygen connected to the breathing cycle via a constant dispensing mechanism and to the breathing bag via a lowermost valve, wherein the lowermost valve is set up for the collapse of the breathing bag in the breathing cycle due to lack of breathing gas reaction and thereby fill the counterlung with oxygen from the oxygen cylinder until it is full; and [0005] Pressure sensor for detecting the pressure in the oxygen cylinder. Background tec...

AI Technical Summary

Problems solved by technology

There are usage scenarios, especially for emergency situations in which the respiratory protection wearer is at risk and has to wait for rescue due to injury or burial (for example in the mining sector) and relatively little oxygen is required due to the small body load ;Longer usage time is urgently needed in these cases

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