IMPELLER OF RADIAL-BLADE FAN Russian patent published in 2017 - IPC F04D29/28 

FIELD: ventilation.

SUBSTANCE: impeller includes the main disc plate 1 with tips 7 with diameter D₃=(1.01…1.02)D₂ of the outer diameter _D2, blades 4 at the points of adjoining to it, the covering disc plate 2 with tips 8, diameter D₄=(1.05…1.1)D₂. The tip 8 of covering disc plate 2 is made flat. The backward curved blades 4 of the impeller is located between the main 1 and the covering 2 disc plates. The exit edge 9 at the section 10 of the blade 4, adjoining to the main disk plate 1, is located at a constant distance R from the impeller axis of rotation 6, and the distance R at the section 11 smoothly increases, as it approaches to the covering disk plate 2, upto the covering disk of radius 2 with end edge 8: R=0.5D₄.

EFFECT: improvement of the head and rate specification and efficiency of the free wheel, the duct fan and fan with scroll case.

2 cl, 4 dwg