Air purifier

An air purifier, comprising:

• a housing that forms an external shape and has a housing space therein that communicates with the outside;
• and
• an air purification unit that is coupled to the housing, comprises a fan member that provides a conveying force to allow external air to be introduced into the housing space of the housing, and a filter member that filters external air introduced into the housing space, and purifies the external air introduced into the housing space and then discharges it to the outside,
• wherein the housing comprises:
• a clean inlet part partially surrounding the housing space, formed through one or more surfaces of the housing, and communicating the outside into the housing space in order to introduce the external air into the housing space and the outside;
• and
• a dust inlet part partially surrounding the housing space, formed through one or more surfaces of the housing, and communicating the outside into the housing space and the outside at a position different from the clean inlet part,
• wherein the clean inlet part is configured to be open or closed, and
• when the clean inlet part is closed, the speed of external air introduced into the dust inlet part is increased by the fan member,
• wherein a power member is coupled to the fan member and configured to rotate the fan member,
• wherein the air purification unit comprises:
• a control member energizably connected to the power member and configured to apply a control signal or power to the power member,
• wherein the control member is configured to control the power member such that a rotation speed of the power member is increased when the clean inlet part is closed;
• wherein the air purifier further comprises a flow passage forming unit;
• wherein the flow passage forming unit is accommodated in the housing space and is in communication with the housing space and the outside, respectively, to form a flow passage through which external air flows to the air purification unit, and
• wherein the flow passage forming unit comprises:
• a purification support part that supports the air purification unit and has a purification flow passage formed therein communicating with the air purification unit;
• an opening/closing member that opens or closes the clean inlet part;
• and
• an opening/closing member support part that is continuous with the purification support part, is located adjacent to the clean inlet part, and includes a connection flow passage therein communicating with the purification flow passage,
• wherein the opening/closing member is rotatably coupled to the opening/closing member support part.