US 12,241,479 B2
Diffuser, air supply device, and vacuum cleaning equipment
Wei Zhang, Guangdong (CN); Tingting Jiang, Guangdong (CN); Yayun Zhou, Guangdong (CN); Fan Yang, Guangdong (CN); and Zhuo Lv, Guangdong (CN)
Assigned to GUANGDONG WELLING MOTOR MANUFACTURING CO., LTD., Guangdong (CN)
Filed by GUANGDONG WELLING MOTOR MANUFACTURING CO., LTD., Guangdong (CN)
Filed on Jun. 1, 2022, as Appl. No. 17/829,872.
Application 17/829,872 is a continuation of application No. PCT/CN2020/137650, filed on Dec. 18, 2020.
Claims priority of application No. 202010010950.8 (CN), filed on Jan. 6, 2020; application No. 202010010952.7 (CN), filed on Jan. 6, 2020; and application No. 202010011558.5 (CN), filed on Jan. 6, 2020.
Prior Publication US 2022/0290689 A1, Sep. 15, 2022
Int. Cl. F04D 29/44 (2006.01); A47L 5/22 (2006.01)
CPC F04D 29/441 (2013.01) [A47L 5/22 (2013.01)] 8 Claims
OG exemplary drawing
 
1. A diffuser comprising:
a base ring member; and
multiple rows of stationary blades, the multiple rows of the stationary blades being disposed on an outer ring wall of the base ring member along an axial direction of the base ring member in sequence and arranged along a circumferential direction of the base ring member,
wherein:
opposite sides of the base ring member along the axial direction are an air-inlet side and an air-outlet side respectively, and from the air-inlet side to the air-outlet side, a chord length of each stationary blade in one row is greater than or equal to a chord length of each stationary blade in a next adjacent row;
the multiple rows of stationary blades comprise a first row of stationary blades and a second row of stationary blades, and the first row of stationary blades and the second row of stationary blades are disposed on the outer ring wall of the base ring member along the axial direction of the base ring member in sequence from the air-inlet side to the air-outlet side;
a ratio of the chord length of each stationary blade in the first row to the chord length of each stationary blade in the second row is greater than or equal to 1 and smaller than or equal to 5;
each stationary blade has an installation angle, and from the air-inlet side to the air-outlet side, the installation angle of each stationary blade in one row is smaller than or equal to the installation angle of each stationary blade in the next adjacent row, wherein the installation angle is an included angle between a forehead line and the chord length of each stationary blade and the installation angle varies in accordance with the chord length, and wherein the forehead line is a line formed by connecting corresponding points at heads of the stationary blades in a same row, and wherein each stationary blade is in an arc shape;
the forehead line of the first row of stationary blades is co-planar with a surface of the base ring member facing the air-inlet side of the base ring member;
a head of each stationary blade has an inlet placement angle, and from the air-inlet side to the air-outlet side, the inlet placement angle of each stationary blade in one row is smaller than or equal to the inlet placement angle of each stationary blade in the next adjacent row;
a tail of each stationary blade has an outlet placement angle, and from the air-inlet side to the air-outlet side, the outlet placement angle of each stationary blade in one row is smaller than or equal to the outlet placement angle of each stationary blade in the next adjacent row; and
from the air-inlet side to the air-outlet side, the outlet placement angle of each stationary blade in one row is smaller than or equal to the inlet placement angle of each stationary blade in the next adjacent row.