Air purification device

An air purification device, comprising:

• a casing provided with an air inlet portion, an air outlet portion, and an air-guiding portion, wherein the air-guiding portion is coupled in fluid communication between the air inlet portion and the air outlet portion;
• at least one filtering mask detachably arranged in a space defined by the casing, wherein the filtering mask has a first filtration member and a second filtration member movably combined with the first filtration member;
• in a first configuration mode, the air inlet portion, the first filtration member, and the air-guiding portion are configured to be in a first fluid-communication state, and the second filtration member is configured to be in a fluid-closed state;
• in a second configuration mode, the first filtration member and the casing are configured to be in a mutually separated state, and the first filtration member and the second filtration member are configured to be in a second fluid-communication state;
• and
• a fan disposed in the casing.