发明授权
- 专利标题: Forward skew fan with rake and chordwise camber corrections
- 专利标题(中): 前倾倾斜风扇,带耙式和弦式外倾矫正
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申请号: US52811申请日: 1993-04-28
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公开(公告)号: US5297931A公开(公告)日: 1994-03-29
- 发明人: Martin G. Yapp , Robert Van Houten , Robert I. Hickey
- 申请人: Martin G. Yapp , Robert Van Houten , Robert I. Hickey
- 申请人地址: MA Watertown
- 专利权人: Airflow Research and Manufacturing Corporation
- 当前专利权人: Airflow Research and Manufacturing Corporation
- 当前专利权人地址: MA Watertown
- 主分类号: F01D1/04
- IPC分类号: F01D1/04 ; F01D5/14 ; F04D29/16 ; F04D29/32 ; F04D29/38 ; F04D29/44 ; E01D1/02
摘要:
An improvement to forwardly skewed axial fans whereby blade camber and rake are coordinated with skew. The blades are characterized in that a line defined by the points of maximum chordwise camber (f.sub.max) as a function of changing radial position (r) is on the leading edge side of the mid-chord line (M.sub.CL) at values of r toward the root of the blade, and is less forwardly skewed than the leading edge (LE), the mid-chord line (M.sub.CL), and the trailing edge (TE) of said blade; the blade is raked forwardly so that the trailing edge of the blade tip is axially forward of the trailing edge at the blade root; rake (k) increases monotonically as radial position r increases from 0.75R to 1.0R, R being the fan radius; the blade has a relatively large pitch ratio (P/D); and rake is corrected to reflect the chordwise position of maximum camber. As a result, the fan produces a flow that is generally in radial equilibrium having a reduced component of flow normal to the2 desired axial flow and normal to the tangential flow. The coordinated fan can be (but need not be) combined with a housing/band configuration for controlling airflow that recirculates (i.e., counter to the desired axial airflow) in a channel formed between the band and housing.
公开/授权文献
- USD407748S Electronic educational game housing 公开/授权日:1999-04-06
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