Air purification device

An air purification device comprising:

• a housing which comprises a passage section through which air is introduced from a room through an inlet pipe by an exhaust fan and is discharged to an outside through an outlet pipe, wherein the passage section has a filter mounting space, an inlet space communicated with the inlet pipe on one side of the filter mounting space, and an outlet space communicated with the outlet pipe on the other side of the filter mounting space, and a backwash intake port formed on the outlet space side;
• a filter mounted in the filter mounting space of the passage section;
• a heater configured to heat the filter;
• an inlet pipe damper configured to open and close an outlet of the inlet pipe;
• an outlet pipe damper configured to open and close an inlet of the outlet pipe;
• an intake port damper configured to open and close the backwash intake port;
• a backwash pipe of which one end is communicated with the inlet space of the passage section, and the other end is communicated with the outlet pipe;
• a backwash pipe damper configured to open and close an inlet of the backwash pipe;
• a controller configured to control the inlet pipe damper and the outlet pipe damper to close the outlet of the inlet pipe and the inlet of the outlet pipe when a clogging phenomenon of the filter occurs, and in this state, control the intake port damper and the backwash pipe damper to open the backwash intake port and the inlet of the backwash pipe;
• a bypass pipe of which one end is communicated with the inlet pipe and the other end is communicated with the backwash pipe;
• and
• a bypass damper configured to open and close the bypass pipe,
• wherein the controller selectively controls the bypass damper to open the bypass pipe when the clogging phenomenon of the filter occurs, and
• wherein after the inlet pipe damper and the outlet pipe damper are operated to open inlet and outlet passages, when continuously receiving a detection signal indicating that the inlet pipe damper or the outlet pipe damper is closed for a preset time, the controller determines that the passage section is closed, and operates the bypass damper to open bypass passage.