| CPC A62B 18/006 (2013.01) [A62B 7/10 (2013.01); A62B 9/04 (2013.01); A62B 18/025 (2013.01); A62B 23/02 (2013.01)] | 10 Claims |
|
1. A powered air purifying respirator composing 2-channel structure for air supply, comprising:
a mask unit that is configured to be worn on a face to surround a mouth or nostrils of a user;
a generator unit that causes outside air to flow in and supplies the air to the mask unit; and
first and second connector units that are formed to provide two respective air channels by being connected to the mask unit at one side of the first and second connector units and being connected to the generator unit at another side of the first and second connector units,
wherein the generator unit includes a fan driving module having first and second air supply holes at both sides of the fan driving module, the first and second air supply holes communicating with an end portion of the first connector unit and with an end portion of the second connector unit, respectively, wherein the fan driving module comprises:
a housing having an inlet hole at one side surface and an accommodation space at an inner side of the housing, the inlet hole being formed to cause the air to flow into the generator unit,
a motor installed at one side of the housing,
a suction fan that is coupled to a rotary shaft of the motor to integrally rotate with the motor and suction the air flowing into the inlet hole, and
a pressure sensing unit provided inside the air channel at the end portion of the second connector unit adjacent to the generator unit to sense a pressure in the air channel, wherein when the pressure is lowered to a pressure equal to or lower than a preset pressure based on a value sensed by the pressure sensing unit, the fan driving module operates such that that the air inside the air channel is discharged outside through the mask unit,
wherein the mask unit includes first and second mask extension portions, wherein the first mask extension portion defines a first mask channel at one side of the mask unit and the second mask extension portion defines a second mask channel at another side of the mask unit, wherein the first connector unit is fluidly connected to the first mask extension portion and the second connector unit is fluidly connected to the second mask extension portion, wherein the air is supplied to the first and second mask channels via the first and second connector units,
wherein the first and second air supply holes are formed in opposite directions to each other at an outer surface of the housing, and the air suctioned into the suction fan flows to the first and second connector units at a constant air pressure along the first and second air supply holes, wherein the suction fan has rotary vanes, which curve in one direction on a disk and are radially formed, so as to form a flow current of the air suctioned into the suction fan in one direction to an outer side of the housing, wherein the fan driving module has first and second extension pipes which are extended in a direction corresponding to the flow current of the air by the rotary vanes and are formed in opposite directions to each other at the outer surface of the housing, wherein the first and second extension pipes have smaller diameters than the first and second connector units, and
wherein the air flowing into the inside of the respirator through the generator unit is supplied to both the first and second connector units, and the air supplied to both sides of the mask unit is discharged outside through a discharge hole formed in the mask unit.
|