US 12,264,681 B2
Dual pressure-boosting high wind speed fan
Qiwei Zhou, Nanchong (CN); Rong Luo, Dongguan (CN); and Xianqiang Li, Dongguan (CN)
Assigned to Dongguan Lianfeng Motor Co., Ltd., Dongguan (CN)
Filed by Dongguan Lianfeng Motor Co., Ltd., Dongguan (CN)
Filed on Jul. 7, 2023, as Appl. No. 18/348,665.
Claims priority of application No. 202310194446.1 (CN), filed on Mar. 3, 2023.
Prior Publication US 2024/0295222 A1, Sep. 5, 2024
Int. Cl. F04D 25/06 (2006.01); F04D 19/00 (2006.01); F04D 29/28 (2006.01); F04D 29/32 (2006.01); F04D 29/52 (2006.01)
CPC F04D 25/06 (2013.01) [F04D 19/002 (2013.01); F04D 29/281 (2013.01); F04D 29/325 (2013.01); F04D 29/522 (2013.01)] 7 Claims
OG exemplary drawing
 
1. A dual pressure-boosting high wind speed fan, comprising a driving motor, a fan housing and a fan blade, wherein an air duct is formed inside the fan housing, the fan blade is located in a front end air inlet of the air duct, and the driving motor is assembled in the fan housing;
the fan blade is provided with a shaft mounting portion and a blade assembly, a middle position of the shaft mounting portion is provided with a shaft mounting hole, and the shaft mounting portion is tightly mounted on a power output shaft of the driving motor through the shaft mounting hole; and
wherein the fan housing comprises a cylindrical wall in a cylindrical shape, the fan housing is provided with a spherical portion arranged coaxially with the cylindrical wall inside the cylindrical wall, a rear end edge portion of the spherical portion is provided with a motor fixing portion arranged spaced from the cylindrical wall, the driving motor is mounted on the motor fixing portion, the power output shaft of the driving motor is mounted on the spherical portion through a bearing, and the fan blade is located at a front end side of the spherical portion;
an outer side wall of the spherical portion is a spherical surface, and a portion of the air duct located between the spherical portion and the cylindrical wall is in a necking shape decreasing gradually from front to back;
the fan blade further comprises a middle circular ring portion which is in a circular ring shape and is located at the periphery of the shaft mounting portion, and the middle circular ring portion and the shaft mounting portion are coaxially arranged at an interval; the blade assembly comprises a first blade assembly and a second blade assembly, wherein the first blade assembly comprises a plurality of first driving blades distributed between the shaft mounting portion and an inner side wall of the middle circular ring portion in an annular array, and the second blade assembly comprises a plurality of second driving blades distributed on an outer side wall of the middle circular ring portion in an annular array; and the shaft mounting portion, the middle circular ring portion, the first blade assembly and the second blade assembly are of an integrated structure;
the shaft mounting portion is in a frustum shape with a front end diameter and a rear end diameter larger than the front end diameter, and a side wall of the shaft mounting portion is a cone-shaped wind guide surface in a conical surface shape; the inner side wall of the middle circular ring portion is in a flaring shape with an inner diameter value increasing gradually from front to back, a channel between the cone-shaped wind guide surface of the shaft mounting portion and the inner side wall of the middle circular ring portion is an inner air duct of the fan blade, and the inner air duct of the fan blade is in a flaring shape increasing gradually from back to front; and
a channel between the outer side wall of the middle circular ring portion and the cylindrical wall is an outer air duct of the fan blade, and the outer air duct of the fan blade is in a flaring shape increasing gradually from back to front.