US 10,537,753 B2Granted

Blower filter system

AssigneeDräger Safety AG & Co. KGaA

InventorsMathias Dehmke, Björn Ehler, Thomas Pernot, Achim Volmer

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Abstract

A blower filter system (2) has a blower filter device (4) with a housing (56), an air inlet (50), an air outlet (52) and an air duct (54) extending between the air inlet (50) and the air outlet (52) in the housing (56). A blower (6), associated with the air duct (54), delivers air from the air inlet (50) to the air outlet (52). An air filter (16) and a carrying system (18) can be connected to the blower filter device (4). A tube (24) extends from the air outlet (52) to a breathing mask (20). A sound emission unit (64) is associated with the blower filter device (4). A wall section (58) of the air duct (54) is formed by an acoustic membrane (60) for coupling sound into the air duct (54). The sound emission unit (64) is arranged in the housing (56) of the blower filter device (4).

Claims19

Dependent claims

A blower filter system comprising:

a blower filter device comprising a housing, an air duct, at least one air inlet and at least one air outlet, wherein the at least one air inlet and the at least one air outlet form respective openings in the housing, and the air duct extending between the air inlet and the air outlet in the housing, the air duct comprising a circumferential outer surface;
a blower associated with the air duct for delivering air from the air inlet to the air outlet;
an air filter operatively connected to the air duct;
a carrying system connected to the blower filter device;
a breathing mask;
a tube extending from the air outlet to the breathing mask;
a sound emission unit associated with the blower filter device;
and
an acoustic membrane coupling sound from outside the air duct into the air duct, wherein a wall section of the air duct is formed by the acoustic membrane and the sound emission unit is arranged outside the air duct in the housing of the blower filter device, the sound emission unit being located at a spaced location from the acoustic membrane.

6 more elements

Dependencies are inferred from the claim text.