| 摘要 |
<p>A respirator has a module (10) comprising a mouthpiece, to be inserted into the mouth of a user of the respirator, and a facepiece (20). The mouthpiece has a flange member (11) which, when in the mouth of a user, fits between the user's lips (13) and teeth (12), with the teeth bearing on a bite piece (14) from which, preferably, palate flaps (15) extend, and with the lips bearing on the surface of troughs in a lips receiving member (17). An aperture (16) in the flange member (11) permits the user to inhale air through a breathing passageway (21) in the lips receiving member. The facepiece (20) comprises an inhalation chamber (25) having at least one inhalation inlet (26A) and a first wall (23) which separates the inhalation chamber (25) from the breathing passageway (21). The first wall (23) contains at least one aperture (24) through which air may pass from the inhalation chamber into the breathing passageway. At least one one-way inhalation valve (27) in the facepiece is biased closed to prevent airflow through the inhalation chamber (25), but is opened by the act of inhalation, which reduces the air pressure in the breathing passageway (21). Nostril plugs (19), each containing a one-way valve (34) which prevents inhalation but permits exhalation through the user's nostrils, and means whereby the depletion of a gas filter may be detected, are also described.</p> |
