Dräger Safety Ag&co. Kgaa

Mathias Dehmke

Achim Volmer

Björn Ehler

Horst Wergen

Lennart Wenzel

Andreas Sürig

Thomas Pernot

Mirco Froesch

A blower filter system () has a blower filter device () with a housing (), an air inlet (), an air outlet () and an air duct () extending between the air inlet () and the air outlet () in the housing (). A blower (), associated with the air duct (), delivers air from the air inlet () to the air outlet (). An air filter () and a carrying system () can be connected to the blower filter device (). A tube () extends from the air outlet () to a breathing mask (). A sound emission unit () is associated with the blower filter device (). A wall section () of the air duct () is formed by an acoustic membrane () for coupling sound into the air duct (). The sound emission unit () is arranged in the housing () of the blower filter device ().

Blower filter system

A blower filter system includes a blower unit (), an electric motor () for driving a blower impeller, a control unit () for controlling the electric motor, contacts () for connecting to a battery pack, and a battery pack () with secondary cells () with high energy density and contacts () for connecting to the blower unit. The blower unit () can be detachably coupled to the battery pack (). The battery pack is electrically connected to the blower unit via the contacts. The battery pack () has protective circuits including electronic components () to electrically switch off at least one of the plurality of secondary cells () of the battery pack if excessive currents and/or excessive temperatures occur. The battery pack () and the blower unit () are each at least partially cast in a casting compound.

Battery-operated blower filter system for use in potentially explosive areas

Breathing device

Growing community of inventors

Lübeck, Germany

Mathias Dehmke