Deep sea diving system having a closed respiratory gas circulation system

摘要

A deep sea diving circulation system for a diver at a diving depth from a station above the water level, comprises a closed respiratory gas delivery line from the station to the diver and a return line from the diver to the station. A CO2 absorber is arranged in the delivery line above the water level along with means for sensing the value of the oxygen in the delivery line and for supplying a correct oxygen replacement. The respiratory gas is circulated by a compressor which is capable of producing the necessary pressure difference for the level of operation of the diver in respect to the surface. A bypass line is arranged to connect across the inlet and outlet to the compressor and the flow cross-section therethrough is controlled by the pressure in the line circulating system. Cylinders with pressurized breathing gas are connected into the circulating line system before the diver's helmet through a pressure reducer having an after pressure lower than the pressure in the line system before the diver's helmet. The carbon dioxide control device is arranged in a bypass line in the system located above the water surface and so is an oxygen control device. A pressure reducer is arranged in the circulating line system and it is actuated by the diving depth pressure.