Oxygen accumulator for constant partial pressure semi-...

B - Operations – Transporting – 63 – C

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137/1.5

B63C 11/18 (2006.01)

Patent

CA 1146837

ABSTRACT The invention relates to improvements in a diver's semi-closed circuit breathing apparatus and is intended to better control the partial pressure of oxygen during descent and ascent. Such apparatus includes a counterlung, sources of oxygen and inert gas, an oxygen regulator, a mass flow jet in the oxygen circuit, a regulator for the inert gas, and a feed-back controlled laminar flow element for feeding a mix- ture of the oxygen and inert gas to a counterlung of the breathing apparatus. The improvement comprises the provision of an oxygen accumulator in the oxygen circuit following the mass flow jet so that a portion of the delivered oxygen is diverted thereto during descent to counteract oxygen partial pressure overshoot. At constant depth the apparatus operates normally, maintaining appropriate oxygen partial pressure, and, during ascent, oxygen is returned from the accumulator to the breathing apparatus to counteract any drop in oxygen partial pressure.

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