COMBINED FILTER (VERSIONS) Russian patent published in 2013 - IPC A62B23/02 

FIELD: salvage appliances.

SUBSTANCE: invention relates to means of individual protection of human respiratory organs (HROIPM) against hazardous substances The combined filter comprises a body, a bottom, a double-layer charge, nets for fixation and separation of the charge, an anti-aerosol filter. The charge comprises an absorber layer, the first on the way of the inhaled air, and the second layer - hopcalite. The first and second layers of the charge are taken at the volume ratio of 1.0:(0.7-1.3) accordingly. The first layer of the charge is an absorber on coal base with oxides and salts of copper and/or zinc and with additives for ammonia absorption. Additives for ammonia absorption are copper and/or zinc sulfates. The other version of filter design, which comprises a body, a bottom, a double-layer charge, nets for fixation and separation of the charge, an anti-aerosol filter. The charge contains a coal-based absorber layer along the inhaled air with metal chloride and the second layer - hopcalite. The first and second layers of the charge are taken at the volume ratio of 1.0:(0.7-1.3) accordingly. The absorber of the first layer of the charge additionally comprises oxides and salts of copper and/or zinc. The metal chloride in the absorber of the first charge layer may be nickel and/or zinc chloride, and/or cobalt chloride, and/or copper chloride. At the same time additives in the form of metal chlorides may be accompanied with their oxychlorides.

EFFECT: increased time of protective action.

12 cl, 2 dwg, 4 tbl