Breathing apparatus

Details Breathing apparatus Breathing apparatus

A - Human Necessities

62

B

137/1.52

A62B 7/10 (2006.01) A62B 18/00 (2006.01) F04D 27/02 (2006.01)

Patent

CA 1310248

ABSTRACT OF THE DISCLOSURE A powered respirator comprises a motor-driven fan unit drawing air through an upstream filter for delivery to a facepiece. Operation of the fan motor is controlled in response to a differential pressure sensor tapped in across the fan unit so as to reduce the fan throughput in response to an increase in the pressure differential and to increase the fan throughput in response to a decrease in the pressure differential, and thereby match the delivery of air to the breathing demand of the wearer. The diaphragm or other pressure-responsive member of the sensor is isolated from unfiltered air and can therefore provide no leakage path for contaminants to the facepice. In an alternative embodiment the positions of the fan and filter are reversed so that the fan is upstream of the filter, and similarly controlled in response to the differential pressure across the fan. In the latter arrangement any contaminant which could pass through the pressure sensor is removed by the downstream filter before delivery to the facepiece.

606556

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