US 11,668,328 B2
Noise reduction device for outlet side of fan and heat exchange system including the same
JunJie Ji, Shanghai (CN); Yuling Shi, Shanghai (CN); Xin Cheng, Shanghai (CN); and Haijun Li, Shanghai (CN)
Assigned to CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed by CARRIER CORPORATION, Palm Beach Gardens, FL (US)
Filed on Dec. 23, 2020, as Appl. No. 17/132,889.
Claims priority of application No. 202021499757.7 (CN), filed on Jul. 27, 2020.
Prior Publication US 2022/0025906 A1, Jan. 27, 2022
Int. Cl. F04D 29/66 (2006.01); F04D 29/54 (2006.01)
CPC F04D 29/665 (2013.01) [F04D 29/545 (2013.01); F05D 2250/52 (2013.01); F05D 2260/96 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A noise reduction device for an outlet side of a fan, the outlet side being provided with an air duct cover with one or more through holes, wherein the noise reduction device comprises:
a connecting portion configured to be connected with at least a part of the air duct cover, and form an accommodation space communicating with an airflow on the outlet side via at least one of the through holes; and
at least one first chamber and at least one second chamber, the first chamber being located in the accommodation space and filled with a sound-absorbing material, and the second chamber being located in the accommodation space and configured as a resonant noise-reduction cavity;
wherein a first through hole, of the one or more through holes, communicating with the first chamber has a different size or shape than a second through hole, of the one or more through holes, communicating with the second chamber;
wherein the connecting portion has a top portion, a side portion, and a bottom portion, an end of each of the top portion and the bottom portion is connected with an end of the side portion respectively, and the other end of each of the top portion and the bottom portion is connected with the air duct cover respectively, for assembling the connecting portion and the air duct cover together to form a cylindrical shape;
wherein the top portion has an extension part configured to extend toward a center of the air duct cover relative to an end of the air duct cover.