Dräger Safety Ag&co. Kgaa

Thomas Pernot

Achim Volmer

Björn Ehler

Hans-Ullrich Hansmann

Mathias Dehmke

Björn Petersen

Marcus Romba

Lutz Rüffert

Sandra Dankertt

A fan filter device () for a respirator () includes an air inlet () for unfiltered air and an air outlet () for the discharge of filtered air. A fan unit (), for aspirating air through the air inlet, includes a fan motor () and a fan sensor (). The fan sensor is designed for detecting at least one operating parameter of the fan motor. The fan filter device further includes a filter unit () for receiving a filter () for filtering the aspirated air and an air flow sensor () for detecting at least one flow parameter of the filtered air flowing through the air outlet. A control unit () is configured to monitor the fan motor as a function of the at least one flow parameter and the at least one operating parameter. A respirator and method for operating such a fan filter device are also provided.

Blower filter device, respirator system and method

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 breathing apparatus includes a filter, a motor and a blower driven by the motor. The filter is disposed ahead of the blower and the blower is configured to generate an air volume flow over the filter. A data storage unit has calibration curves for the air volume flow stored therein and the calibration curves are provided in characteristic line fields referenced to a known ambient pressure (p, p). Each of the characteristic line fields has a reference calibration curve referred to a predetermined operating state. A control unit is connected to the motor and the data storage unit. The control unit is configured to extrapolate one of the characteristic line fields for the operation of the motor by comparing a calibration curve ({dot over (V)}) for an unknown ambient pressure (p) recorded at a predetermined operating state with a reference calibration curve.

Breathing apparatus with compensation of the ambient pressure

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Lübeck, Germany

Thomas Pernot