| 摘要 |
<p>A closed breathing system for divers, comprising a circulation circuit having a supply line (1) and a return line (2) for circulation of breathing gas through the helmet (3) of diver, a pump means (4) for pumping of the breathing gas in the circuit, a gas recovery means (9) arranged in the circuit, and a regulating valve (8) for controlling the breathing gas respectively to and from the diver's helmet (3). The pump (4) is a pneumatic pump which is constructed so that, at any time, it maintains a given relatively small pressure difference between the supply line (1) and the return line (2). In the supply line (1) there is connected a buffer volume (10) maintaining a positive supply pressure, the volume being provided with a means, such as a pneumatic cylinder (11), creating a counter-pressure on the gas in the buffer volume (10), and the regulating valve (8) is arranged to be operated under the influence of very small pressure variations in the helmet (3).</p> |
