US 12,078,360 B2
Range hood
Shogo Yamazoe, Ashigara-kami-gun (JP); and Yoshihiro Sugawara, Ashigara-kami-gun (JP)
Assigned to FUJIFILM Corporation, Tokyo (JP)
Filed by FUJIFILM Corporation, Tokyo (JP)
Filed on Jun. 8, 2020, as Appl. No. 16/895,544.
Application 16/895,544 is a continuation of application No. PCT/JP2018/045499, filed on Dec. 11, 2018.
Claims priority of application No. 2017-237129 (JP), filed on Dec. 11, 2017.
Prior Publication US 2020/0300478 A1, Sep. 24, 2020
Int. Cl. F24C 15/20 (2006.01); F24F 13/24 (2006.01)
CPC F24C 15/20 (2013.01) [F24F 13/24 (2013.01); F24F 2013/242 (2013.01)] 14 Claims
OG exemplary drawing
 
1. A range hood comprising:
a suction portion that has a suction opening and that sucks air from below in a vertical direction;
a duct portion that have a connection opening connected to the suction portion and conveys air sucked from the connection opening and discharges the air from a discharge opening to an outside;
an air blowing mechanism that is disposed in the duct portion and that moves air in the duct portion to the discharge opening; and
a flow regulation plate that is disposed in the suction opening of the suction portion or is disposed so as to cover a part of the suction opening,
wherein a distance between the suction portion and the flow regulation plate is 110 mm or smaller, and
wherein the range hood has two or more soundproof structures having different frequency characteristics on a surface of the flow regulation plate on the suction portion side between the flow regulation plate and the suction portion; and
a sound reduction peak frequency of one of the soundproof structures disposed on a side closer to the connection opening is higher than a sound reduction peak frequency of another of the soundproof structures disposed on a side farther from the connection opening, and
wherein one of the soundproof structures disposed on a side closer to the connection opening has a peak of sound absorption coefficient at a frequency higher than a cut-off frequency in a flow path that is formed from the suction portion, the duct portion, the air blowing mechanism, and the flow regulation plate, and
wherein another of the soundproof structures disposed on a side farther from the connection opening has a peak of sound absorption coefficient at a frequency lower than or equal to the cut-off frequency.