BREATHING SYSTEM OF MEMBRANE TYPE WITH COMPRESSED AIR Russian patent published in 2013 - IPC F24F3/00 

FIELD: machine building.

SUBSTANCE: breathing air cleaning device includes a membrane separating unit including a membrane filter having penetrated and non-penetrated gas areas, a housing for arrangement of the membrane filter in it, an inlet feed pipeline connected to the membrane filter, and a discharge pipeline of non-penetrated gas, which is connected as to fluid medium to the non-penetrated gas area of the membrane filter; a catalytic filter unit containing a cartridge with a catalyser layer, two end parts retaining the cartridge with the catalyser layer inside the housing and having outlet holes, the catalyser inlet pipeline connected to the catalyser layer and connected as to fluid medium to the above discharge pipeline of non-penetrated gas, and received gas discharge pipeline connected to outlet holes; and inlet blow-down pipe connecting the catalytic filter unit to the penetrated gas area of the membrane filter.

EFFECT: creation of a portable breathing air cleaning system having low manufacturing cost and not requiring availability of any external provision means beside compressed air.