Axial or diagonal fan with trip edge on the rotor blade
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F04D-029/38
F04D-029/68
출원번호
US-0356167
(2012-12-20)
등록번호
US-9803649
(2017-10-31)
우선권정보
DE-10 2012 000 376 (2012-01-12)
국제출원번호
PCT/EP2012/076521
(2012-12-20)
국제공개번호
WO2013/104513
(2013-07-18)
발명자
/ 주소
Ragg, Peter
Stadler, Michael
출원인 / 주소
EBM-PAPST ST. GEORGEN GmbH & Co. KG
대리인 / 주소
Oliver, Milton
인용정보
피인용 횟수 :
0인용 특허 :
17
초록▼
An axial- or diagonal-fan has a fan wheel (34) having profiled rotor blades (32). Each blade has a suction or intake side (46), a portion located forward, with respect to the rotation direction (36), and having a leading edge (44), and a portion located rearward, with respect to the rotation directi
An axial- or diagonal-fan has a fan wheel (34) having profiled rotor blades (32). Each blade has a suction or intake side (46), a portion located forward, with respect to the rotation direction (36), and having a leading edge (44), and a portion located rearward, with respect to the rotation direction (36), and having a trailing edge (92). Between said portions, on the intake side (46) of the respective rotor blade (32), a trip or separation edge (66) is provided, said trip edge having an S-shaped contour in a meridian cross-section.
대표청구항▼
1. An axial- or diagonal-blower with an electric motor with a stator (118) and a rotor (120), a fan wheel (30), and a housing formed with a fanwheel-facing generally cylindrical inner surface (110), the electric motor being arranged in said housing, said fan wheel (30) comprising an annular fan whee
1. An axial- or diagonal-blower with an electric motor with a stator (118) and a rotor (120), a fan wheel (30), and a housing formed with a fanwheel-facing generally cylindrical inner surface (110), the electric motor being arranged in said housing, said fan wheel (30) comprising an annular fan wheel hub (34), secured to said rotor (120) and, together with the generally cylindrical inner surface (110), defining an annular air passage opening therebetween;a plurality of individual profiled fan rotor blades (32), each extending radially from a root (70) at said hub (34) to a blade outer tip arranged in said annular air passage opening;said profiled fan blades (32) each having an intake side (46), a portion located, with respect to rotation direction (36), forward and having a leading edge (44), a portion located, with respect to rotation direction (36), rearward, and having a trailing edge (92); between which portions a trip edge (66) is located, which, between said root and said tip, has an S-shaped contour,said contour extending, from a radially inner portion of said fan rotor blade to a radially outer portion (78) thereof, inside a band (B) measured, starting from said leading edge (44), within a range from 30% to 100% of the width (L) of the fan blade (32), said trip edge running from said radially inner portion of the fan rotor blade to said radially outer portion of the fan rotor blade. 2. The blower of claim 1, wherein said band (B) is defined by a pair of boundary lines (100, 102);a line (101) runs, radially with respect to the fan wheel hub (34), across each respective rotor blade (32); andsaid pair of boundary lines enclose an angle (a) which is in a range between 0° and 30° relative to the radially running line (101). 3. The blower of claim 1, wherein the trip edge (66) is implemented as a step on a suction side (46) of the respective rotor blade (32). 4. The blower of claim 1, wherein the trip edge (66) runs from said radially inner portion of each blade into said radially outer portion thereof, adjacent a blade surface portion which, during fan operation, is contiguous with a detachment zone (45) formed abutting said blade, and wherein the trip edge (66) describes over its radial extent an alternatingly-curved course. 5. The blower of claim 4, wherein the alternatingly-curved course of the trip edge (66) extends, on its radially inner portion, to a region (68) of the respective rotor blade (32) which lies, with reference to the circumferential width dimension, in the middle of the blade. 6. The blower of claim 4, wherein the alternatingly-curved course of the trip edge (66) extends, on its radially inner portion, to a region (68) of the respective rotor blade (32) which lies between the trailing edge (92) thereof and a region which is, with reference to the circumferential dimension, in the middle of the blade. 7. The blower of claim 4, wherein the trip edge (66) runs at a distance (DS) from the contour of the detachment zone (45) and, at least over most of its length, outside of said detachment zone (45). 8. A blower according to claim 7, wherein a distance (DS) of the contour from the detachment zone (45) is one to two percent of the diameter (D) of the fan wheel (34).
Mills, Robert J.; Henne, Preston A., Mitigation of unsteady peak fan blade and disc stresses in turbofan engines through the use of flow control devices to stabilize boundary layer characteristics.
※ AI-Helper는 부적절한 답변을 할 수 있습니다.