SYSTEM FOR CONVERTING WIND ENERGY

CROSS-REFERENCE TO RELATED APPLICATIONS

This application is a National Stage of International patent application PCT/TN2010/000005, filed on Oct. 6, 2010, which claims priority to foreign Tunisian patent application No. TN2010/0433, filed on Sep. 22, 2010, the disclosures of which are incorporated by reference in their entirety.

FIELD OF THE INVENTION

The invention that is the subject of this technical description consists of a system for converting wind energy (SCEE) into mechanical then hydraulic and electrical energy.

BACKGROUND OF THE INVENTION

This system for converting wind energy (SCEE), described hereinbelow, is not subject to the theoretical Betz limit (59%). Consequently, this invention offers an efficiency far superior to that of the wind turbines currently used.

DETAILED DESCRIPTION

The system (SCEE) has a wheel (F) provided with a series of blades arranged all around it (see drawing no. 1). The wheel (F) rotates in a pivot connection about a fixed axle (L), by virtue of the kinetic energy of the wind which passes through the blades, thus offering the wheel (F) a rotational mechanical energy.

Set on the axle (L), a support (E), which is fairly rigid, ensures the fastening of the end-plates (or of the rear end) of a series of double-acting actuating cylinders (D). The latter can consist of one or more double-acting actuating cylinders (see drawing no. 1). In order to simplify this description, this system (SCEE) has a series of three double-acting actuating cylinders. The series of double-acting actuating cylinders (D) on the support (E) have to be distributed and positioned in a well-defined manner in order to guarantee better operation (see detail no. 1 of drawing no. 1).

The rods of the pistons of the series of double-acting actuating cylinders (D) are in a ball-jointed connection with the body (A) in order to offer the latter a maximum degree of freedom in space, apart from the rotational motion relative to the axle (L) that the kinetic chain of the system as a whole does not allow it to perform. The degrees of freedom thus offered to the body (A) allow it to benefit from a movement and a behavior that are more fluid facing the wind (see detail no. 1 of drawing no. 1) and (drawing no. 7). This body (A) has a concave form, aiming obtain a higher aerodynamic resistance factor (drag factor, Cx) and therefore a maximum of resultant force of the wind picked up. Moreover, the body (A) should be as light as possible. For this, and in a nonlimiting manner, a part of its surface can be, for example, covered with gauze (see drawing no. 2).

Thus, to allow the wheel (F) to rotate freely and independently of the body (A) which is freed of rotation relative to the axle (L), its active surface (the surface facing the wind) is permanently held exposed to the wind (see the front views of drawings no. 3, no. 4, no. 5 and no. 6).

The fastenings of the rods of the pistons of the double-acting actuating cylinders (D) on the body (A) have to be away from the axis which coincides with the direction of the vector of the resultant force of the wind which drives the body (A) (see detail no. 1 of drawing no. 1).

A rigid arm (C) is set on one side on the wheel (F) and held on the other side, in a pivot connection, on a U-shaped section piece (B). Having a circular satellite motion, the latter rotates, consequently, with the wheel (F) while sliding over a peripheral region of the body (A) (see drawing no. 2). In order to minimize the sliding friction of the section piece (B), the latter can be in contact with the faces of the peripheral region of the body (A) via rollers or similar. Moreover, the peripheral region of the body (A) should be fairly smooth and fairly rigid.

When the wind acts on the body (A), the latter pivots without performing any rotation, under the effect of the moment of the resultant force of the wind, having as fulcrum that of the section piece (B); thus, the body (A) pushes, without jamming, by virtue of the ball-jointed connections, the rods of the double-acting actuating cylinders (D) which are present in the region diametrically opposite to the section piece (B). The rods of the double-acting actuating cylinders (D) present in the inverse region (region on the side of the section piece (B)) have a tendency to be pulled (see drawing no. 3).

Having a circular satellite motion, the section piece (B) rotates while sliding over a peripheral region of the body (A), thus changing the fulcrum of the moment of the resultant force of the wind (the pivot connection of the section piece (B)) which is applied to the body (A). The rods of the double-acting actuating cylinders (D) will consequently be pulled and pushed, while having a cyclical translational motion (see drawings no. 3, no. 4, no. 5 and no. 6). Thus, the wind energy picked up by the body (A) is converted into translational mechanical energy on the pistons of the double-acting actuating cylinders (D), thus hydraulic pressure on the latter. It is obvious to the person skilled in the art that this mechanism can be replaced by any other device making it possible to convert translational mechanical energy into hydraulic energy, such as single-acting actuating cylinders, axial pistons.

The front, left side, plan and perspective views of drawings no. 3, no. 4, no. 5 and no. 6 show the action of the body (A) on the rods of the double-acting actuating cylinders (D) as well as the behavior of the system (SCEE) facing the wind, for different positions (0°, 90°, 180° and)270° of the section piece (B) on the peripheral region 1 of the body (A).

A nacelle (J) is set on the axle (L). This nacelle (J) primarily contains a hydraulic motor (H) and an electric generator (G), which can be coupled via a speed-increasing gear (see drawing no. 1).

During the reciprocal motions of the pistons of the series of double-acting actuating cylinders (D), the latter push a hydraulic fluid toward the go hydraulic circuit (in red) in one direction, whether by pulling or by pushing and do so by virtue of a set of valves (see drawing no. 7). The latter also makes it possible to suck the hydraulic fluid into the double-acting actuating cylinders (D) through the return hydraulic circuit (in blue) and do so in one direction, “regardless of the pulling or pushing motion”.

The go hydraulic circuit (in red) is connected to the input of a hydraulic motor (H). The return hydraulic circuit (in blue), is elsewhere connected to the output of the hydraulic motor (H) (see drawing no. 7). Thus, the pressurized flow of the hydraulic fluid is converted into a rotational motion of the axle of the motor (H), which is connected to the axle of the electric current generator (G), via a speed-increasing gear, thus generating the actual electric energy (see drawing no. 7). Moreover, it is obvious to the person skilled in the art that by using the hydraulic transmission vector between the mechanical and electrical energy it becomes possible to immediately convert the pressurized flow thus obtained via the hydraulic motor (H) or to store it in its original hydraulic form, for a subsequent use.

In order to allow a constant orientation facing the wind, the system (SCEE), can be equipped with an automatic orientation system enabling it to pivot on the mast (I) and to keep the body (A) and the wheel (F) permanently facing the wind, and do so in downstream or upstream mode. Moreover, the orientation can be ensured using a tail vane (K), of well determined dimensions, fastened, through a support, to the nacelle (J) (see drawing no. 1). In order to simplify the operation of the orientation of the system (SCEE), and in a nonlimiting manner, the tail vane (K) solution is, in this case, retained as an explanatory example.

Thus, the wind energy picked up by the body (A) is converted into a translational, then rotational, mechanical energy respectively via the rods of the series of actuating cylinders (D) and the hydraulic motor (H). This mechanical energy is subsequently converted into electrical energy using the electric generator (G). The link of this energy conversion chain, in relation to the conversion of the translational mechanical energy into rotational mechanical energy, can be handled, and in a nonlimiting manner, via a number of other mechanisms such as connecting rod-crank or similar.

As stated at the start of the technical description, this system (SCEE) is not subject to the theoretical Betz limit (16/27) and offers a better wind energy conversion efficiency. The only component subject to the Betz limit is only the wheel (F) which presents only a minimal active surface relative to the overall active surface of the system (SCEE). Furthermore, this wheel (F) is used only to change the position of the section piece (B) by a circular satellite motion and the energy that it picks up is not taken into account in the energy conversion chain, described hereinabove, or in the final energy recovered. Thus, the rotation of the section piece (B) via the wheel (F), which is its sole function, is ensured by a mechanism using the quantity of wind energy driving the blades thereof; consequently, this device can be replaced by other mechanisms capable of ensuring the same function of rotating the section piece (B).