	US 11,808,280 B2
	Centrifugal fan and clothing dryer
Peishi Lv, Qingdao (CN); Tao Li, Qingdao (CN); Jindong Bing, Qingdao (CN); Rongfeng Cheng, Qingdao (CN); and Long Yang, Qingdao (CN)
Assigned to QINGDAO HAIER DRUM WASHING MACHINE CO., LTD., Qingdao (CN); and Haier Smart Home Co., Ltd., Qingdao (CN)
Appl. No. 17/613,635
Filed by QINGDAO HAIER DRUM WASHING MACHINE CO., LTD., Qingdao (CN); and Haier Smart Home Co., Ltd., Qingdao (CN)
PCT Filed May 13, 2020, PCT No. PCT/CN2020/090029 § 371(c)(1), (2) Date Nov. 23, 2021, PCT Pub. No. WO2020/233471, PCT Pub. Date Nov. 26, 2020.
Claims priority of application No. 201910435945.9 (CN), filed on May 23, 2019.
Prior Publication US 2022/0228601 A1, Jul. 21, 2022
Int. Cl. F04D 29/42 (2006.01); D06F 58/20 (2006.01); F04D 17/16 (2006.01); F04D 29/28 (2006.01); F04D 29/30 (2006.01)

CPC F04D 29/4226 (2013.01) [D06F 58/20 (2013.01); F04D 17/16 (2013.01); F04D 29/281 (2013.01); F04D 29/30 (2013.01); F04D 29/422 (2013.01); F04D 29/424 (2013.01)]

14 Claims

1. A centrifugal fan, comprising: a housing, and an impeller and volute tongues that are arranged in the housing, wherein the housing is provided with an air inlet and an air outlet, the volute tongues comprise a first volute tongue and a second volute tongue that are stacked and offset from each other, and the impeller is arranged to be capable of suctioning air into the housing from the air inlet when rotating; and wherein the first volute tongue is arranged to be capable of cutting the air blown from the impeller and guiding the air to the air outlet when the impeller is rotating in a forward direction, and the second volute tongue is arranged to be capable of cutting the air blown from the impeller and guiding the air to the air outlet when the impeller is rotating in a reverse direction.