| 摘要 |
PCT No. PCT/GB88/00725 Sec. 371 Date Apr. 12, 1990 Sec. 102(e) Date Apr. 12, 1990 PCT Filed Sep. 2, 1988 PCT Pub. No. WO89/01895 PCT Pub. Date Mar. 9, 1989.A breathing apparatus is provided for use, particularly by divers, in recirculation of a breathing gas. The apparatus has a supply line for supply of gas to a user and a return line for return of exhaust gas from the user to be recirculated. Two gas chambers of variable volume, a first in the supply line and a second in the return line, are capable of changing volume in unison with the user's breathing to accommodate a change in gas volume in the apparatus due to the user's breathing action. The first and second chambers are constrained to operate together in such a way that the variation of volume of either chamber is accompanied by a similar variation in the volume of the other chamber. Thus, both chambers would be full together (maximum operational volume) and empty together (minimum operational volume). Preferably, the variable volume chamber is in the form of a counterlung. For example, a pair of linked counterlungs may be used, or preferably a double counterlung comprising a single body with two separate chambers could be employed.
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