Air purifier

An air purifier, comprising:

• an inner case having a cylindrical shape and at least one air intake;
• a fan provided in the inner case to suction air through the at least one air intake;
• a filter provided in the inner case to filter suctioned air through the at least one air intake;
• and
• an outer case having a cylindrical shape and at least one air outtake through which filtered air is discharged, the outer case provided radially outside of the inner case and being configured to move in an axial direction of the fan between a first position and a second position so as to change a length of overlap between the inner and outer cases,
• wherein the at least one outtake of the outer case includes:
• an end discharge grill provided at an end of the outer case at an outlet side of the fan such that air is discharged through the end discharge grill in the axial direction;
• and
• a side discharge opening formed in a side wall of the outer case through which air is discharged radially outward.

An air purifier, comprising:

• a first case having a suction portion including a plurality of first holes through which air is suctioned;
• a fan and a filter provided inside of the first case to suction and filter air, respectively;
• and
• a second case having a plurality of second holes, the second case being slideably coupled to the first case to move relative to the first case so that an amount of overlap between the first and second holes is adjusted based on a movement of the second case,
• wherein:
• when the second case is moved to a first position, the second holes are provided at an intake side of the fan so as to serve as air intakes;
• when the second case is moved to a second position, the second holes are provided at an outtake side of the fan so as air outtakes;
• and
• when the second case is moved to a third position between the first and second positions, some of the second holes are provided at the intake side of the fan and some of the second holes are provided at the outtake side of the fan.