A gas bag capable of autoinflation
underwater is designed in the invention. The gas bag comprises a
gas cylinder housing (1), a spring (2), a valve inner-
nozzle (3), a reinforced sleeve (4), a valve
bushing (5), a locating slot (6), a
jackscrew (7), a sealing ring (8), a thread sleeve (9) and a gas bag (10). When the gas bag is filled with
high pressure gas, the locating slot (6) is filled with a whole piece of edible rock
sugar and the outside of the locating slot is sealed up with paraffin. The
jackscrew (7) is screwed. Before the gas bag and a
gas cylinder are poured
underwater to carry out air inflation work, a
small hole is poked in the paraffin seal outside the locating slot (6) of the
gas cylinder according to the sinking depth
underwater. Then, the
jackscrew is screwed down, and the gas cylinder and the gas bag are poured into water. After the rock
sugar in the locating slot (6) is dissolved underwater, the spring (2) pushes the valve inner-
nozzle (3) to move outwards for a distance L. the valve inner-
nozzle (3) is communicated with a venthole in the valve
bushing (5), and
high pressure gas in the gas cylinder is automatically ejected to inflate the gas bag.