Rotary Bi-Plan Wind Turbine (ROBIPLAN®)

according to the Patent ROBIPLAN® deposited the 26/11/2007 by Pascal HA PHAM

TECHNICAL FIELD OF THE INVENTION :

The present invention is a significant evolution of the windturbine's concept. A windturbine is using the energy of the wind thanks to a moving mechanism actuated by the natural flow of air ; this mechanism is build with at least to identical and balanced blades which are mounted on a rotary axis which is parallel to the flowing direction of the air, this is the orientation of these blades as an helix which is entailing the rotation. The rotary axis is usually stationary maintained and situated in an horizontal position parallel to the ground and orthogonal to the rotary plane of the helix. The best power is achieved by modifying the values of 2 main parameters : the orientation of the blades and the pursuit of the direction of wind for the mechanism.


GENERAL DESCRIPTION OF THE INVENTION :

Unlike the windturbine and the other existing machines which are powered by natural flows, the moving part gets an elementary flow which is hitting a double plane with 2 linked rotations according to 2 simultaneous rotary motions : the rotation of a twin-blades / couple of blades (BPA) in a first plane which is perpendicular to its rotary axis (AXR), and the rotation of the rotary axis of the twin-blades in a second plane which is perpendicular to the first (fig 1 et 2). The  rotation of the axis of the twin-blades (BPA) is done around its point of intersection with the rotary plane linked to the couple of blades (fig 2 et 3). While rotating, the axis of the twin-blades is turning around itself and guided by the gallows (POT). The 2 blades are constituting the twin-blades and orthogonal the one to the other, symetrically placed on both sides of their rotary axis. These blades don't have an helical aspect, but defined with a profile which preferably gets a constant area with two cutting symetric sides ; the blades can notably be perfectly  plane. Thus, the rotations of the twin-blades are done around an axis whose position is constantly changing during the rotary cycle of the gallows, which is alternately putting against the wind one of the faces and one of the cutting sides, then the other face and the other cutting side, that for one and the other blade whose planes are always in a relative angular gap of 90° . The 2 imbricated rotations are obtained by a set of parts, gearings, chain and conical couple in cascade (CAS) which are controlling the kinematics and the required relative simultaneous motions. The rotary blades are piloting the rotation of the axis of the twin-blades - around itself - through the gallows and the set of kinematical parts. One of the gearings of the conical couple is blocked on the support of the machine. This new settlement allows the machine to work with moving cycles which alternate each blade of the twin-blades against the wind, then fleeing the wind, every quarter of cycle, and reciprocally. Each blade is regularly moving while cutting the wind then countering the flows (orthogonal) in the step of starting while facing the wind, and finally from countering the wind towards cutting the wind in its step of fleeing the wind (fig 1).


CHARACTERIZATION OF THE CONSTITUENT PARTS

Characterization of the twin-blades (BPA) :
It is a monolithic set of two identical blades which are fixed in a balanced way on both sides of an axis of rotation : the surfaces of the 2 blades which constitute the twin-bladed (BPA) are orthogonal one to the other and mounted symmetrically on the both sides of their axis of rotation (AXR).

Characterization of the axis of rotation of the twin-bladed (AXR) :
It is the axis that carries and guide the rotary twin-blades, it also receives the first gearing which controls the kinematic cascade (CAS). It is geometrically constrained by a gallows.

Characterization of the gallows (POT) :
It is the rotating support which is giving the second coupled rotation of the machine. It is piloted by the rotation of the twin-blades through the kinematic cascade gearing / chain / conical couple. It can take a simplified shape as mono arm in reversed L, or a stronger shape in reversed U if the power to transmit is big. It must be both mechanically strong and sufficiently perforated / shaped in order not to become an obstacle for the flowing vein of fluid which feeds the machine (fig 2 and 3).

Characterization of the kinematic cascade (CAS) :
It is granting the rotation by quarter of round of the gallows for every quarter of powering cycle of the twin-blades. The axes of these two elements are perpendicular, thus we have to use at least a first gearing which is mounted on the axis of the twin-blades, a second gearing with the same number of teeth on a superior intermediate axis (AIN), a chain to join the two gearings (ratio 1/1) and a final conical couple (ratio 1/1) with return at 90°. One of the elements of the final conical couple is bound of the intermediate axis, the other is fixed on the support of the machine, which is materialized by an axis of output that guides the rotary motion of the gallows.

Characterization of the machine's supporting part (SUP) :
This is the part which carries the gallows and guides it according to a rotary motion. The second gearing of the conical couple is fixed on this support and appears as the last element of the kinematic cascade (CAS). This part is the main mechanical link of the machine to the ground and notably allows to fix it on a pedestal.



PRINCIPLE OF WORKING :

A picture divides the cycle in 4 steps and allows to view the successive positions of the constituent parts. This drawing illustrates the complete sequence of a rotation and makes possible to understand that when it is submitted to a flow of wind, this new machine has a very perennial granted motion : the kinematic cascade (CAS) gives the rotation by quarter of round of the gallows for every quarter of powering cycle of the twin-blades (fig 2).
As a summary, the moving twin-blades with 2 imbricated planes is fully working inside the vein of fluid while delivering a strong average torque ; the twin-blades is cyclically evolving in the 3 dimensions of the space. The range of useful windspeeds is very wide and many natural situations can be accepted. There is no deadpoint of power during the cycle.

The machine can also work with a liquid flow, or in a reversible way as a compressor / fan when its gallows is actuated in rotation by an external motor. In each case, the surfaces, measurements and materials of the constituent parts must be thought again, proportioned, and adapted to the required expectations.
On a cycle (a round of gallows), the average powering surface of the twin-blades which is moving inside the flow (in orthogonal equivalence) is identical to the surface of a blade. On a cycle, the maximal swept surface by a asymmetrical twin-blades (as one "square" blade and the other "half moon blade") is lower than 2 times the added front area of the 2 blades.

It is therefore more of the half of the swept surface by the twin-blades that can be constantly active (orthogonal equivalence to the flow). While using asymmetric blades, a dynamic balancing is necessary. Thus the ratio of maximal compactness of this wind machine can be higher than 50% (ratio between the active orthogonal surface and the swept surface by the twin-blades on a cycle). Two working prototypes / proof of concept have been build at the end of 2007 and the beginning of 2008 years..