초록 ▼

A portable respirator system for supplying clean, breathable air to a hood or face mask is disclosed. The system can be carried on a waist belt and includes a housing containing air inlet and outlet plenums, and a battery powered, electric motor operated blower connected between the inlet and outlet

A portable respirator system for supplying clean, breathable air to a hood or face mask is disclosed. The system can be carried on a waist belt and includes a housing containing air inlet and outlet plenums, and a battery powered, electric motor operated blower connected between the inlet and outlet plenums. The motor can be manually switched between high and low speed operation to supply high quantities of air upon demand caused by high respiration rate and otherwise supply lower quantities of air sufficient for low respiration rates to extend battery life between rechargings. A differential air pressure sensing switch is responsively connected for actuation when the difference between air pressure in the outlet plenum and the pressure of ambient atmosphere is less than a preselected value. A battery powered audible alarm sounds upon actuation of the switch to alert the user to the approach of potentially dangerously lowair pressure in the outlet plenum and, consequently, in the mask or hood so that appropriate corrective action can be taken. The housing contains a dividing wall therein which is spaced from a front cover which partially defines the air inlet plenum. The system can be operated in either a powered air purifying respirator mode or a supplied air respirator mode.

대표청구항 ▼

A respirator system for supplying breathable air to a hood or face mask comprising a housing containing a first chamber defining a component cavity, an air inlet plenum disposed in said housing, air filter means removably connectable to said housing for removing contaminants from ambient air passing

A respirator system for supplying breathable air to a hood or face mask comprising a housing containing a first chamber defining a component cavity, an air inlet plenum disposed in said housing, air filter means removably connectable to said housing for removing contaminants from ambient air passing therethrough, said air filter means communicating with ambient atmosphere external to said housing and with said air inlet plenum, blower means disposed in said component cavity and having an air inlet port and an air outlet port, said air inlet port communicating with said air inlet plenum, a motor disposed in said component cavity and operatively connected to said blower means, an air outlet plenum disposed in said component cavity and connected in fluid receiving relation to said blower air outlet port, said air outlet plenum being connectable in air supplying relation to said hood or mask for operation of the system in a powered air purifying respirator mode, valve means connected between said blower air outlet port and said air outlet plenum for permitting air, under pressure, to flow from said blower means into said air outlet plenum and for preventing air, under pressure, from escaping said air outlet plenum into said blower air outlet port, differential air pressure sensing means connected in fluid responsive relation between ambient atmosphere and said air outlet plenum for sensing when the difference between the pressure of air in said air outlet plenum and the pressure of ambient atmosphere is less than a preselected minimum value, and alarm means responsively connected to said sensing means for indicating when said pressure difference is less than said value.