US 7,677,865 B2 · Air purifier

Abstract

An air purifier includes a bell-mouth having an enhanced structure to prevent an increase of noise at a particular frequency when air flows into the blowing fan through the bell-mouth. The air purifier includes a housing, a filter unit and a blowing fan placed inside the housing, and a bell-mouth placed toward an intake side of the blowing fan. The bell-mouth includes an inlet port formed at a center of the bell-mouth, a flow guide extending from a periphery of the inlet port toward the blowing fan, and a flat section positioned to discontinue the flow guide to increase a distance between the blowing fan and the bell-mouth. The flat section is formed at the section in the range of about 240°˜330° with respect to a starting point of a scroll inside the bell-mouth. The flat section may have a saw-tooth shape to effectively distribute air passing therethrough.

Claims14

Dependent claims

An air purifier, comprising:

a housing;
a filter unit inside the housing;
a blowing fan inside the housing;
and
a bell-mouth placed toward an intake side of the blowing fan, wherein the bell-mouth includes an inlet port formed at a center of the bell-mouth, a flow guide extending from a periphery of the inlet port toward the blowing fan along a first peripheral section of the inlet port, and a flat section positioned along a second peripheral section of the inlet port to discontinue the flow guide to increase a distance between the blowing fan and the bell-mouth,
wherein the first peripheral section is longer than the second peripheral section,
wherein the flat section is formed at a section of the flow guide where air flows through the inlet port of the bell-mouth, and
wherein the second peripheral section is formed in the range of about 240°˜330° with respect to a starting point of a scroll inside the bell-mouth.

5 more elements

Dependencies are inferred from the claim text.

Air purifier

Life of this patent

Air purifier

Life of this patent

Abstract

Claims14