SEMI-CLOSED-TYPE BREATHING APPARATUS Russian patent published in 2008 - IPC B63C11/20 B63C11/24 

FIELD: transportation, diving equipment.

SUBSTANCE: semi-closed-type breathing apparatus contains a diver's bag with a bleeding valve, a box with carbon dioxide absorber, a gas cylinders with reducers, metering nozzle for continuous feed of oxygen into the breathing bag, a lung-governed breathing apparatus, a valve box with a breath-in valve and breath-in/out pipes. A metering valve is arranged between the cylinder reducer and the breathing bag to ensure a controlled feed of nitrogen depending upon the water pressure. The breath-in valve is arranged at the inlet of the cartridge with absorber of chemicals, while before the breath-out valve an automatic oxygen corrector is arranged connected, via the reducer, with the oxygen cylinder to feed oxygen into breathing circuit in compliance with the diver pulmonary ventilation volume.

EFFECT: smaller weight and sixes, greater depth of diving, shorter decompression time.

2 dwg