Tank state-detecting breathing air charger

A breathing air charger for detecting a tank state, comprising:

• a fine dust sensor (130) that is provided on an air discharge line (120) of a breathing air tank (110), which contains high-pressure air provided from a high-pressure air charger (100), to sense a concentration of fine dust contained in air discharged from the breathing air tank (110);
• and
• a controller (22) that compares a detection value of the concentration of the fine dust, which is input from the fine dust sensor (130), with a preset fine dust concentration reference value and outputs an alert signal when the detection value of the concentration of the fine dust is equal to or greater than the preset fine dust concentration reference value,
• wherein the high-pressure air charger (100) includes:
• a multi-stage compression-type compressor having a plurality of compression units connected with respective lines, in which external air introduced through a main air line is compressed in multiple stages while sequentially passing through the compression units, to compress air while being driven by one power;
• an oxygen/nitrogen separator that is provided on a discharge/suction line provided between a first stage compression unit and a second stage compression unit in the multi-stage compression-type compressor to separate oxygen and nitrogen, which is contained in the air, from each other in a membrane manner;
• and
• an air cooling and purifying filter unit that is provided on at least one line of each discharge/suction line connecting the compression units in the multi-stage compression-type compressor to each other and a discharge line of a final compression unit to cool and purify the air, to allow the oxygen and the nitrogen in the air to be separated from each other and the separated oxygen or nitrogen to be supplied to a user or a use place, and
• wherein the high-pressure air charger includes:
• the solenoid valves and flow meters that are provided on an oxygen discharge line and a nitrogen discharge line provided on the oxygen/nitrogen separator, and on a sub-air line connected to a discharge/suction line provided between the second-stage compression unit in the multi-stage compression-type compressor and the oxygen/nitrogen separator to control an amount of the air flowing the lines and flow of the air;
• and
• a controller that controls operations of the solenoid valves and flow meters to control concentration of the oxygen or the nitrogen.