Blade with a blade shaft for an impeller of an axial flow fan

Details Blade with a blade shaft for an impeller of an axial flow fan Blade with a blade shaft for an impeller of an axial flow fan

F - Mech Eng,Light,Heat,Weapons

04

D

230/20

F04D 29/32 (2006.01)

Patent

CA 1235401

ABSTRACT OF THE DISCLOSURE In an axial flow fan impeller with a number of blades rotatably journalled in a wheel rim, each blade root is connected with a blade shaft by bayonet engagement between these two elements, one of which has a part forming a bayonet plug member with at least one pair of opposed cam portions, whereas the other has a part forming a bayonet socket member with a bore with recesses matching said cam portions. The bayonet plug and socket members may individually be formed as parts of either the blade root or the blade shaft. In the axial direction, the recesses in the bore of the bayonet socket member is designed with an axial play relative to the axial length of the cam portions of the bayonet plug member. Two fixation screws extend through threaded bores in the blade root and have their ends formed as smooth guide portions for insertion into fit bores in a centering portion of the blade shaft. Inside the guide portion, each fixation screw has a shoulder portion for abutment against a spring member arranged between the blade root and the side of the centering portion facing the blade root. At the mount- ing of the blade, the fixation screws are tightened after completion of the bayonet engagement. Thereby, the blade root with the blade will be pressed outwardly due to the pressure from the spring member for frictional engagement between the cam portions of the bayonet plug member and the recesses in the bore of the bayonet socket member.

465033

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