BIRD'S WING TYPE HIGH-PRESSURE AXIAL FLOW FAN BLADE AND COUNTER-ROTATING AXIAL FLOW FAN THEREOF

摘要

A bird's wing type high-pressure axial flow fan blade and counter-rotating axial flow fan thereof. The blade comprises a blade body (1) and a blade shank (2). The blade body (1) consists of a blade head (101), a blade top (102), a blade tail (103) and a blade root (104). A windward side of the blade is a blade concave portion (106), and a leeward side of the blade is a blade convex portion (107). A cross-section of the blade from the blade root (104) to the blade top (102) is in a twisted shape. The blade concave portion (106) of the blade has an arc-shaped convex accelerating area (108) passing through the blade top (102) to the blade root (104) along an axis (105) of the blade body. The fan comprises an air inlet side blade (4) and an air outlet side blade (5). The air inlet side blade (4) and the air outlet side blade (5) are driven respectively by separate motors (6, 7) oppositely disposed. A blade tail (4013) of the air inlet side blade (4) is oppositely disposed to a blade head (5011) of the air outlet side blade (5). The blade tail (4013) of the air inlet side blade (4) and the blade head (5011) of the air outlet side blade (5) are straight sides parallel to central axes (4015, 5015).