Low-speed high-pressure-ratio axial-flow impeller with highly twisted blades having Bezier camber lines
A Bessel medium and twisted blade technology, applied in the field of axial flow fan impeller, can solve the problems of increasing design difficulty and achieve the effect of meeting the cooling and ventilation requirements and compact structure
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Embodiment 1
[0024] The invention provides a novel axial-flow impeller with low speed and high pressure than Bessel mid-arc with stronger twisted blades, the diameter of the hub is 525-535mm, and the height of the blade is 230-238mm; 9-11 pieces of Bessel mid-arc are used to change the cross-section The blades are strongly twisted and evenly distributed along the circumference. The blades and the hub are designed with integral casting, and the surface is smoothed to ensure surface roughness; the axial length of the blades is longer, 220-230mm, which increases the blade's rigidity in a limited space. The chord length of the blade root is 285-290mm, and the chord length of the blade top is 318-322mm, which increases the effective work area of the blade and thus achieves a relatively high pressure ratio at low speed; No overlap, the blade root adopts a larger installation angle of 49-53°; the degree of reaction increases along the blade height direction, making full use of the working abilit...
Embodiment 2
[0026] Such as Figure 2-Figure 4 As shown, the novel low-speed high-pressure ratio Bessel axial flow impeller with strong twisted blades in the middle arc of the present invention. The diameter of the hub is 265mm, and the outer diameter of the impeller is 500mm. It adopts 10 pieces of Bessel medium-arc variable cross-section strongly twisted blades and distributes them evenly along the circumference. The blades and the hub adopt an integral casting design, and the surface is smoothed to ensure surface roughness; Figure 4 Sectional line 1 of the middle blade root, section line 2 of the blade at 0.5 blade height, and section line 3 of the blade top are optimized section lines of blades at various heights; in order to meet the casting process and strength requirements, the connection between the blade and the hub is rounded Angle, rounding radius 13mm; blade axial length 223.55mm, blade root chord length 286.8mm, blade top chord length 319.5mm, blade root installation angle is...
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