Fluid reaction surfaces (i.e. – impellers) – Articulated – resiliently mounted or self-shifting impeller... – Sectional – staged or nonrigid working member
Patent
1981-05-20
1984-03-06
Powell, Jr., Everette A.
Fluid reaction surfaces (i.e., impellers)
Articulated, resiliently mounted or self-shifting impeller...
Sectional, staged or nonrigid working member
416142, 416196A, F03D 1104
Patent
active
044351259
ABSTRACT:
A spindle assembly for a soft airfoil wind turbine wheel having an elongate support cable connected in tension between the rim and hub of the wheel, an elongate, rotatable spindle mounted adjacent the elongate support member and a constraint mechanism for constraining the spindle against excessive bowing in response to wind pressure. The constraint mechanism includes a plurality of clamps mounted to the elongate support member which loosely surround the spindle and any airfoil furled therearound except for a slot for passage of the airfoil. Rollers are located adjacent the slots to guide the airfoil therethrough and are mounted to rotate about members interconnecting the clamps so that the wind pressure exerted by the soft airfoil is distributed along the length of the support members. Bracing cables connected to the elongate support member further distribute the wind pressure forces to the wheel structure and ground. In one embodiment, one end of the spindle and the constraint clamps are mounted for pivotal movement about the elongate support member. In another embodiment, an elongate boom is connected to a portion of a constraint clamp and pivots therewith about the support member. In one form, the slot in the constraint clamp may be widened to remove the clamp from around the spindle. When the spindle is fixedly rather than pivotally mounted, other embodiments provide for fixed mounting of the clamps to the support member, rotary movement of the clamps and attached boom about an axis passing through the clamps and eccentric movement of the clamps and attached boom relative to the spindle axis. The variation in apparent wind direction relative to the airfoil caused by wheel rotation is accommodated by differential pivoting of the constraint members, so that more pivoting of constraint members located further from the hub occurs than those closer to the hub.
REFERENCES:
patent: 677747 (1901-07-01), Sterzing
patent: 789497 (1905-05-01), Johnson
patent: 980172 (1910-12-01), Brett
patent: 1417000 (1922-05-01), Vogt et al.
patent: 1713866 (1929-05-01), D'Asseler
patent: 3835804 (1974-09-01), Jackson
patent: 4116152 (1978-09-01), Larsson
Dulin Jacques M.
Powell Jr. Everette A.
Windpowered Machines Ltd.
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