# US 9,435,547 B2 · Indoor device for an air conditioner > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 9,435,547 B2 - Document ID: US9435547B2 - Status: Granted - Kind: B2 - Application number: 14/079,783 - Filed: 2013-11-14 - Published: 2014-05-15 - Granted: 2016-09-06 - Earliest claimed: 2012-11-15 - Assignees: LG Electronics Inc. - Applicants: LG Electronics Inc. - Inventors: Yungkoo Lee; Jungwoo Lee; Jaehyuk Jung; Geunho Jin; Dongsoo Moon; Kidong Kim - Web page: https://patentgrep.com/patent/US9435547B2 ## CPC - F24F 1/0022: Centrifugal or radial fans - F04D 17/16: for displacing without appreciable compression - F04D 29/051: Axial thrust balancing - F04D 29/058: magnetic; electromagnetic - F04D 29/281: {for fans or blowers} - F04D 29/668: {damping or preventing mechanical vibrations} - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - F04D: NON-POSITIVE-DISPLACEMENT PUMPS (engine fuel-injection pumps F02M; ion pumps H01J41/12; electrodynamic pumps H02K44/02) ## Abstract An indoor device for an air conditioner is provided. The indoor device may include a heat exchanger mounting panel in which an orifice to pass air therethrough is formed, a centrifugal fan to inhale air in a shaft direction through the orifice and discharge the air in a radial direction, a motor to rotate the centrifugal fan, and a case to fix the motor and couple the motor to the panel. A first magnetic substance and a second magnetic substance that generate a repulsive force may be respectively disposed at a first surface opposite to the centrifugal fan in the panel and a second surface opposite to the panel in the centrifugal fan. In the first magnetic substance and the second magnetic substance, the same pole may be formed in a concentric circle and different poles may be alternately formed in a radial direction. ## Claims ### Claim 1 An indoor device for an air conditioner, comprising: a heat exchanger mounting panel in which an orifice to pass air therethrough is formed; a centrifugal fan to inhale air in a shaft direction through the orifice and discharge the air in a radial direction; a motor to rotate the centrifugal fan; and a case to fix the motor and couple the motor to the panel, wherein a first magnetic substance and a second magnetic substance that generate a repulsive force are respectively disposed at a first surface opposite to the centrifugal fan in the panel and a second surface opposite to the panel in the centrifugal fan. ### Claim 2 (depends on 1) The indoor device of claim 1, wherein the first magnetic substance and the second magnetic substance each comprises a ring-shaped magnet. ### Claim 3 (depends on 2) The indoor device of claim 2, wherein in the first magnetic substance and the second magnetic substance, the same pole is formed in a concentric circle. ### Claim 4 (depends on 3) The indoor device of claim 3, wherein in the first magnetic substance and the second magnetic substance, different poles are alternately formed in a radial direction. ### Claim 5 (depends on 2) The indoor device of claim 2, wherein the first magnetic substance and the second magnetic substance each comprises a rubber magnet. ### Claim 6 (depends on 1) The indoor device of claim 1, wherein a circumferential edge of an inner circumferential surface of the panel is curved with a predetermined curvature to form the orifice so as to guide air inhaled by the centrifugal fan, and wherein the first magnetic substance is disposed adjacent an outer circumference of the orifice. ### Claim 7 (depends on 6) The indoor device of claim 6, wherein the centrifugal fan comprises: a hub portion to couple to a rotational shaft of the motor; a blade portion, a first side of a plurality of blades of which is fixed to the hub portion in a state in which the plurality of blades extends in a direction away from the rotational axis with a predetermined gap formed therebetween; and a circular rim formed at an outer circumference of the plurality of blades and fixed to a second side of the plurality of blades opposite to the first side fixed to the hub portion, wherein the second magnetic substance is disposed at the circular rim. ### Claim 8 (depends on 7) The indoor device of claim 7, wherein a third magnetic substance and a fourth magnetic substance that generate a repulsive force are respectively disposed at a third surface, which is a surface opposite to a surface to which the plurality of blades is fixed in the hub portion, and a fourth surface opposite to the third surface in the case, respectively. ### Claim 9 (depends on 8) The indoor device of claim 8, wherein the third magnetic substance and the fourth magnetic substance each comprises a ring-shaped magnet in which the same pole is formed in a concentric circle. ### Claim 10 (depends on 9) The indoor device of claim 9, wherein different poles are alternately formed in a radial direction in the ring-shaped magnet. ### Claim 11 (depends on 9) The indoor device of claim 9, wherein the third magnetic substance and the fourth magnetic substance each have a diameter smaller than a diameter of the second magnetic substance. ### Claim 12 (depends on 9) The indoor device of claim 9, wherein a fifth magnetic substance and a sixth magnetic substance that generate a repulsive force are respectively disposed at the third surface. and the fourth surface. ### Claim 13 (depends on 12) The indoor device of claim 12, wherein the fifth magnetic substance and the sixth magnetic substance each comprises a ring-shaped magnet and have a diameter smaller than a diameter of the third magnetic substance and the fourth magnetic substance. ### Claim 14 (depends on 1) An air conditioner comprising the indoor device of claim 1. ### Claim 15 An indoor device for an air conditioner, comprising: a heat exchanger mounting panel in which an orifice to pass air therethrough is formed; a centrifugal fan to inhale air in a shaft direction through the orifice and discharge the air in a radial direction; a motor to rotate the centrifugal fan; and a case to fix the motor and couple the motor to the panel, wherein the centrifugal fan comprises a hub portion to couple to a rotational shaft of the motor and a blade portion, a first side of a plurality of blades of which is fixed to the hub portion in a state in which the plurality of blades extends in a direction away from the rotational axis with a predetermined gap therebetween, and wherein a first magnetic substance and a second magnetic substance that generate a repulsive force are respectively disposed at a first surface, which is a surface opposite to a surface to which the plurality of blades is fixed in the hub portion and a second surface opposite to the first surface in the case. ### Claim 16 (depends on 15) The indoor device of claim 15, wherein the first magnetic substance and the second magnetic substance each comprises a ring-shaped magnet in which the same pole is formed in a concentric circle, and different poles are alternately formed in a radial direction in the ring-shaped magnet. ### Claim 17 (depends on 15) The indoor device of claim 15, wherein a third magnetic substance and a fourth magnetic substance that generate a repulsive force are respectively disposed at a third surface opposite to the centrifugal fan in the panel and a fourth surface opposite to the panel in the centrifugal fan. ### Claim 18 (depends on 17) The indoor device of claim 17, wherein a circumferential edge of an inner circumferential surface of the panel is curved with a predetermined curvature to form the orifice so as to guide air inhaled by the centrifugal fan, wherein the centrifugal fan further comprises a circular rim formed at an outer circumference side of the plurality of blades and fixed to a second side opposite to the first side of the plurality of blades fixed to the hub portion, and wherein the third magnetic substance is formed adjacent an outer circumference of the orifice, and the fourth magnetic substance is mounted in the circular rim. ### Claim 19 (depends on 18) The indoor device of claim 18, wherein the third magnetic substance and the fourth magnetic substance each comprises a ring-shaped magnet in which the same pole is formed in a concentric circle, and different poles are alternately formed in a radial direction in the ring-shaped magnet. ### Claim 20 (depends on 19) The indoor device of claim 19, wherein the third magnetic substance and the fourth magnetic substance each have a diameter larger than a diameter of the first magnetic substance and the second magnetic substance.