| 摘要 |
The use of respirator masks with positive pressure in the interior of the mask makes sure that during inhalation as well as exhalation a positive pressure prevails which prevents ambient atmosphere from entering. The lung controlled valve is separated by a control membrane into a breathing chamber and an outer chamber. The breathing gas chamber, connected with the interior of the mask, has the internal pressure thereof. For respiratory gas supply, the breathing gas chamber is connected with the respiratory gas source through an inlet valve controlled by the control membrane via a coupling means. The outer chamber contains a shutoff device by which the control membrane, manually actuated by a magnetic key, is held in a shutting position with simultaneous closing of the inlet valve. With the respirator mask taken off, unnecessary flow of respiratory gas is prevented. Upon placing it on and starting to breathe, the control member is pulled off the magnet without any additional action to be undertaken by the user, being thereby released from the shutting position. Normal lung controlled respiratory gas supply with the positive pressure in the interior of the mask is again possible.
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